RAF Diaphragm Valve for Waterworks

Transcription

1 RAF Diphrgm Vlve for Wterworks Interntionl Compny

2 RAF GENERAL PURPOSE HYDRAULIC VALVES T e c h n i c l I n f o r m t i o n Contents RAF 0 Flot Level Control Vlve RAF 0 Electric Flot Control Vlve RAF Bi - level Flot Control Vlve RAF 0 Pump Protection Control Vlve RAF - Electric Control Vlve RAF 0/ Altitude Control Vlve RAF 0/ Two Wy Pressure Reducing Control Vlve RAF B Three Wy Pressure Rreducing Control Vlve RAF Vlves re used for generl wter supply nd irrigtion. The RAF vlves re mde of only three prts, ech one is mde of durble mterils. The inner flow pssges re stremlined nd coted with lowfriction mterils. This provides quiet flow in both directions, low hed-loss nd miniml wer. RAF / RAF B RAF 70/7 RAF Q RAF / RAF B Two Wy Pressure Reducing/Sustining Control Vlve Three Wy Pressure Reducing/Sustining Control Vlve Flow Rte Control Vlve Quick Pressure Relief Vlve Two Wy Pressure Sustining/Relief Control Vlve Three Wy Pressure Sustining/Relief Control Vlve Technicl Specifictions Body nd Cover: Cst Iron with Rilsn (Nylon ) coting. Epoxy or enmel coting re vilble by request. Bolts, Nuts nd Wshers: Zinc plted Steel. Diphrgm: Nturl Rubber reinforced with Nylon Fbric. RAF RAF Surge Anticipting Control Vlve Anti-Burst Control Vlve Working Pressure: Up to brs. Temperture Rting: -0 C to C. SPECIALLY DESIGNED Recommended Working Conditions Rnge Nom. Di. Inlet Pressure, Br mm inch Min Mx. Q = Kv P Q = Flow rte, m /h P = Hed loss cross the vlve,brs Cv =.Kv *Kv fctor Fully opened Vlve RAF RAF -A Control Chmber Volume Liter Gllon Cross section of RAF vlve RAF vlves operte with ptented reinforced diphrgm, which elimintes the need for retining metl spring. The specil elstic design enbles grdul nd precise opening or closing of the vlve. By eliminting metl spring, the RAF is virtully mintennce free.

3 PRESSURE-LOSS CHART FOR VALVES IN LINE ANGLE BAR PSI ,,D D,5D,D 0 BAR PSI D D GPM M /H GPM M /H RAFA Angle RAF In Line Nom. Di. mm inch 0 / 5 / 5 / / / / / /- - /- -- L H mm B h Weight kg Connections Thred / Grooved Thred / Grooved Flnge Thred / Grooved Flnge Thred / Grooved Flnge Thred / Grooved Flnge Thred / Grooved Flnge Flnge Thred / Grooved Flnge Flnge Flnge Flnge Flnge Flnge Flnge Thred / Grooved Flnge Thred / Grooved Flnge Thred / Grooved Flnge Thred / Grooved Flnge Thred / Grooved Flnge Flnge Thred / Grooved Flnge Flnge Dimensions of RAF & RAF-A RAF D h H L B RAF ( Inline ) RAF-A ( Angle ) Interntionl Compny

4 RAF RAF 0 Flot Level Control Vlve GENERAL PURPOSE HYDRAULIC VALVES Description RAF 0 is used to mintin preset wter level in reservoir or wter tnk in simple, economic mnner. The RAF vlve is ctivted by the line pressure. The RAF0 stys open s long s the wter level in the reservoir is below the preset level. As the wter level rises nd lifts the flot, the vlve grdully closes. Typicl Appliction RAF 0 Flot Level Control Vlve controls the wter level of wter tnk. The vlve cn lso be locted bove the wter level. Use RAF 0 for reservoirs nd wter tnks level control in ny sitution tht mximum wter level should be mintined. No need for energy other thn line pressure. RAF 0 is best fit in remote sites. Due to its simple design, it is virtully mintennce free. Recommended Flow Nominl Dimeter Flow Rte m /h mm Inch Min. Mx

5 RAF 0 control mode RAF Flot level control Vlve is ctivted by line pressure nd controlled by two-wy flot pilot. The pilot vent is opened or closed ccording to the flot level. The flot is locted inside the reservoir s shown. The verticl wter level chnges re mplified by lever nd conveyed to the flot. The flot vlve will close when wter level reches its preset. VENT Automtic Opertion: When the wter level is low, the lever drops due to the flot weight. The vent is open. The control chmber of the RAF is drined through the vent. The diphrgm of the RAF is forced upwrd by the line pressure. The RAF opens nd reservoir is being filled. As the flot lever moves upwrd, due to the rising wter level inside the wter tnk, the vent closes mechniclly. The RAF is then closed by the line pressure, forcing its diphrgm downwrds. RAF 0 - Flot Level Control Vlve Adjustment Adjust the needle vlve to llow sufficiently short closure time. Preset the pilot to the reservoir s desired mximum wter level. Plese Specify: Mximum Operting Pressure (Closed vlve) Minimum & Mximum Flow rtes. Mximum wter level Stndrd RAF 0: Bsic RAF vlve Rilsn coted Self-clening screen filter Brss Pilot P-0 Brss Flot rm Specil Fetures: Enmel coting Lrge cpcity externl filter Stinless Steel Pilot P-0T Stinless Steel Flot rm Stinless Steel flot Cock vlve Needle vlve Reinforced plstic tubing Copper or stinless steel tubing Interntionl Compny

6 RAF GENERAL PURPOSE HYDRAULIC VALVES RAF 0 Electric Flot Control Vlve Description RAF 0 is normlly closed electric flot control vlve, ctivted by line pressure. The electric circuit is switched by flot hnging over the wter surfce t the desired height. When the wter level drops below the flot, the electric circuit is switched on nd opens the RAF 0 through solenoid vlve. As the rising wter reches the mximum level, the solenoid is deenergized nd the RAF 0 closes. The RAF 0 is non modulting service vlve, operting s n on/off vlve. Typicl Appliction RAF 0 electric flot controls the wter level of wter tnk. The vlve cn be locted lso bove the upper wter level of the tnk. Use RAF 0 for wter level control. The vlve is best for remote or locl control of reservoirs nd wter tnks level control when electricity is vilble. Due to its simple design it is virtully mintennce free. Recommended Flow Nominl Dimeter Flow Rte Mx.m /h mm Inch Norml Intermittent

7 RAF 0 control mode RAF Electric Flot Control Vlve is ctivted by line pressure nd controlled by three-wy solenoid vlve. The RAF 0 is normlly closed. An electric circuit is switched ON/OFF by dry contct flot hnging over the wter surfce. When the flot hngs by its cble verticlly bove the wter surfce, the circuit is connected, the solenoid is energized nd the RAF vlve fully opens. When the flot turns over by the rising wter level the electricl circuit is disconnected, the solenoid is de-energized nd the RAF is closed. In cse of power filure, the RAF 0 remins tight-close to void uncontrolled spill of wter. N.O. VENT C A C O A Automtic Opertion: Position the selecting cock on AUTO When the wter level is low, the electric circuit is connected. The solenoid is energized. The RAF s control chmber drins out. The RAF is fully open. When the wter level rises nd turns over the electric flot, the electric circuit turns off nd de-energizes the solenoid. Line pressure is then connected to control chmber through solenoid. The RAF 0 closes nd stops the wter flow into the tnk. Stndrd RAF 0: Bsic RAF vlve Rilsn Coted Self-clening screen filter Mnul Opertion: To open the vlve overriding the flot plce the Selecting Cock in Open position. To close the vlve overriding the flot plce the Selecting Cock in Close position. Specil Fetures: Enmel coting Lrge cpcity externl filter wy V AC N.O. Solenoid vlve /0Hz 0V, 0V AC nd 9V, V, V DC Dry contct electric flot w/0m. cble Selecting Cock vlve ( port bll vlve) Reinforced plstic tubing RAF 0 - Electric Flot Control Vlve Copper or stinless steel tubing Adjustment Fix the flot s cble to the reservoir s inner wll t the desired level. This fixtion point will be in between minimum nd mximum levels, llowing the flot to turn up nd down. The length of electric cble left fter the fixtion point will define the difference between minimum nd mximum wter level pre set. Plese Specify: Mximum Operting Pressure (Closed vlve). Electric source dt if diefrent thn stndrd. Interntionl Compny

8 RAF RAF Bi - level Flot Control Vlve GENERAL PURPOSE HYDRAULIC VALVES Description RAF is used to control filling of wter reservoirs nd tnks. The RAF is non-modulting service vlve, operting s n on/off vlve. The RAF vlve is ctivted by the line pressure only nd controlled by flot pilot. The vlve will open t low preset wter level nd close t preset high wter level, different thn the opening level. The RAF llows filling nd drining of reservoir or wter tnk in level rnge tht cn be esily chnged. The RAF stys in its lst position (fully open or fully closed) s long s the wter level is in between minimum nd mximum preset levels. Typicl Appliction Use RAF for reservoirs nd wter tnks for level control in ny sitution tht wter level controlled. No need for energy other thn line pressure. RAF is best fit where On/Off, non-modulting vlve opertion is essentil. Recommended Flow Nominl Dimeter Flow Rte Mx. m /h mm Inch Norml Intermittent

9 RAF control mode RAF Flot level control Vlve is ctivted by line pressure nd controlled by three-wy flot pilot. The flot is locted inside the reservoir s shown. The verticl wter level chnges re conveyed to the flot. Automtic Opertion: When the wter level reduces the flot slides down on the rod due to its weight. When it reches the minimum preset level indicted by the lower stopper ttched to the Pilot s rod, the pilot s vent port is connected to the control chmber of the RAF. The diphrgm of the RAF is forced upwrds by line pressure, the RAF opens nd reservoir is filled. When wter level rises, the flot slides upwrds on the rod. The vlve in this cse will remin open until mximum preset level (upper stopper) is reched. At mximum level the flot forces upper stopper up. The control cmber is connected then through the pilot to pressure supply. The line pressure forces the RAF diphrgm downwrd nd the vlve closes, cutting wter supply to the reservoir. Stndrd RAF : Bsic RAF vlve Rilsn Coted Self-clening screen filter Mnul Opertion: To open the vlves overriding the flot plce, the Selecting Cock is in Open position. To close the vlves overriding the flot plce, the Selecting Cock is in Close position. Specil Fetures: Enmel coting Lrge cpcity externl filter C A P C A RAF - Bi-level Flot Control Vlve Adjustment After instlling the flot pilot djust the upper stopper to mximum required wter level, fixing it to the rod. Adjust in the sme mnner the lower stopper in the required minimum wter level. Plce the selecting Cock in uto position. The flot should not suffer fluctutions cused by the wves in the reservoir. The flot should be protected from the wter inlet of the reservoir or wter tnk nd s distnt s possible Brss Pilot P-7 Stinless Steel Pilot P-7T Stinless Steel flot - Stinless Steel Flot rod (Stndrd m.) Stinless steel rod extension Selecting Cock vlve ( port bll vlve) - Plese Specify: Mximum Operting Pressure (Closed vlve). Minimum & Mximum Flow rtes. Mximum wter level. Flot rod length if not stndrd. Reinforced plstic tubing Copper or stinless steel tubing Interntionl Compny

10 RAF RAF 0 - Pump Protection Control Vlve GENERAL PURPOSE HYDRAULIC VALVES Description The RAF 0 vlve regultes the pressure level during the strt nd shut-off of pump to protect the pumping ssembly nd the downstrem network. The RAF 0 is pplicble, with slightly different lyout nd switching, for either verticl (deep well) or horizontl (booster) pumps. In both configurtions, the RAF 0 is connected electriclly to the pump s control pnel. For booster pumps control the RAF 0 is instlled on the min line downstrem of the pump. Generlly the vlve protects the booster pump nd its engine by sustining the pressure in strting nd shutoff, nd function s check vlve otherwise. The vlve protects the pump in cse of power shutdown by sustining the pressure downstrem the pump. In deep well configurtions, the RAF 0 is instlled on tee brnch off the min line. It functions bsiclly s pressure relief. Letting low pressure in strting nd shut-off, nd closes other wise to enble grdul pressure buildup. In cse of emergency shutdown, the RAF 0 opens to relieve pressure from the verticl pump. Typicl Appliction RAF 0 controls the out flow of booster pump. The pump s intke is on the min line t the left. Note lso Quick Relief Vlve - RAF Q on the right. Use Pump Control Hydrulic Vlve with ny pump to protect the pump housing, the pumping ccessories nd wter lines. Protection is needed in both horizontl nd verticl pumps. Consult Rphel engineers for the most suitble lyout, switching nd sizing of pump control vlves for your ppliction. Recommended Flow Nominl Dimeter Flow Rte Mx. m /h mm Inch Norml Intermittent

11 RAF 0 control mode Booster pump configurtion Vent Automtic: The three-wy cock should be positioned t A. Normlly, the power is turned OFF nd the vlve is closed, s illustrted. When the pump is turned ON, the solenoid is energized nd its plunger flips to the left. Port of the solenoid closes, port nd the vent open. The control chmber of the RAF 0 drin, the RAF opens grdully, llowing the pump to chieve higher outflow. As the RAF 0 opens, the indictor rises to its upper position. When the electric power is turned OFF, from ny reson, the solenoid de-energizes, its plunger flips bck to the right (s shown), nd the RAF 0 grdully closes. The pressure is sustined. In norml shutdown the pump is turned off electriclly by the limit switch only fter the RAF 0 is completely closed. In cse of unexpected shutdown the RAF 0 closes t the sme time. Check vlves re locted on ech side of the RAF 0 to ensure its closure. Deep well configurtion Automtic: The RAF is instlled on tee brnch off the min line. The RAF 0 is normlly open to llow low pressure nd buildup of full pumping. As the pump is turned ON timer strts countdown nd eventully De-energizes the solenoid, the vlve closes grdully under incresing pressure. When the power is turned OFF, the RAF 0 opens to relieve the pressure grdully. Mnul: Use the three-wy cock to open or close the RAF 0, by turning the hndle to O or C, respectively. C A RAF 0 - Pump Protection Control Vlve Electric scheme WELL PUMP CONTROL VALVE ELECTRIC SCHEM AUTO OFF L HAND COM. A H CR N.C. CR SW CR CR CR CH PVS CR L SW N.O. CR Stndrd RAF 0: Specil Fetures: Bsic RAF vlve Rilsn Coted Enmel coting Self-clening screen filter Lrge cpcity externl filter Brss check vlves - Indictor with limit switch ssembly - wy V AC N.O. Solenoid vlve /0Hz 0V, 0V AC nd 9V, V, V DC Selecting Cock vlve ( port bll vlve) - Reinforced plstic tubing Copper or stinless steel tubing AUTO-OFF-HAND CR CR CR SW SW PVS M NOTE: CR Plese Specify: M - SELECTOR SWICH - RELAY, DPST NORMALLY OPEN - RELAY, DPST NORMALLY OPEN - RELAY, DPST NORMALLY OPEN - SWITCH, REMOTE START, AUTOMATIC - SWITCH, SPDT VALVE LIMIT SWITCH (CONNECT TO N.C. TERMINAL) - PILOT VALVE OLENOIDS HOOKED IN PARLLEL - PUMP MOTOR STARTED SW, nd PVS supplied by RAPHAEL. All other electricl items supplied by customer Electric source (If not stndrd) Pump Configurtion (Booster or deep well pump) Interntionl Compny

12 RAF GENERAL PURPOSE HYDRAULIC VALVES RAF - Electric Control Vlve Description RAF nd RAF vlves re ctivted by line pressure. The vlves open or close by electric commnd through selection of solenoid vlves. The solenoid opens or closes the RAF s it is energized by n electric pulse. The electric pulse tht commnds the vlves is generted by controller, timer, sensor or n electric control device. Typicl Appliction A progrmmed irrigtion controller commnds severl NC vlves to wter vrious crops. Ech plot hs different intervl nd cycle durtion. On/Off electric vlves re used for remote opertion of hydrulic vlves by n electric commnd. The vlves cn be configured either s Normlly open (N.O. With no energy the vlve is opened by line pressure) or Normlly closed (N.C. With no energy the vlve is closed by line pressure). Recommended Flow Nominl Dimeter Flow Rte.m /h mm Inch Mx

13 RAF / control mode Normlly Close Mode By defult of the normlly closed RAF vlve, the line pressure is connected to the RAF vlve s control chmber bove its diphrgm. Thus, the diphrgm is pressed downwrds ginst the vlve set nd the vlve is closed. When the solenoid is energized by n electric pulse the line control chmber is disconnected from line pressure nd drined through the solenoid s vent. The RAF s diphrgm is then forced upwrd by line pressure nd fully opens. Normlly Open Mode By defult of the normlly open RAF vlve, the RAF vlve s control chmber is connected to the drin of the solenoid, the diphrgm is pressed upwrds by line pressure nd the vlve fully opens. When the solenoid is energized by n electric pulse the pressure source connects to the control chmber of the vlve. The line pressure pushes the diphrgm ll the wy downwrds nd the RAF closes. N.O VENT RAF - Three Wy NC Electric Control Vlve The stndrd RAF/ Electric control vlve is Three wy configured. When the wter from the control chmber cnnot be drined to the tmosphere, from ny reson, two wy configurtions RAF - Three Wy NO Electric Control Vlve N.C VENT re lso vilble. The vlve cn be then configured s wy Normlly Close (RAF - W N.C.), Electric Control vlve, or wy Normlly Open (RAF0 - W N.O.), Electric Control vlve. Stndrd RAF (Normlly Close): Stndrd RAF (Normlly Open): Specil Fetures: Bsic RAF vlve Rilsn Coted Bsic RAF vlve Rilsn Coted Enmel coting Self-clening screen filter Self-clening screen filter Lrge cpcity externl filter wy N.O. Solenoid vlve wy N.C. Solenoid vlve wy N.O. Solenoid vlves V AC /0 Hz power source V AC /0 Hz power source 0V, 0V AC nd 9V, V, V DC Reinforced plstic tubing Reinforced plstic tubing Copper or stinless steel tubing Interntionl Compny 0

14 RAF GENERAL PURPOSE HYDRAULIC VALVES RAF 0/ Altitude Control Vlve Description RAF 0/ is used to mintin preset wter level of reservoirs or wter tnks. The RAF vlve is ctivted by line pressure, nd is commnded by n Altitude pilot. The Altitude pilot is mounted on the vlve, therefore there is no instlltion required on top of the reservoir. The RAF 0 vlve controls the mximum wter level of the reservoir by controlling the mximum wter column pressure generted by the wter inside the wter storge. RAF The RAF 0/ stys open s long s the wter level of the reservoir is below preset level. The RAF 0 is non modulting service vlve, operting s n on/off vlve. RAF 0 Typicl Appliction Recommended Flow Nominl Dimeter Flow Rte Mx.m /h mm Inch Mx RAF 0 Altitude Control Vlve controls the wter level in wter tnk Use RAF 0 for reservoirs nd wter tnks level controls, especilly in high rise reservoirs. Line pressure provides energy suitble for opertion. RAF 0 is prticulrly suitble for remote sites. Due to its simple design it is virtully mintennce free

15 RAF 0 - Wy Altitude Control Hydrulic Vlve. Especilly fit when high precision is requested nd smll vrition between minimum nd mximum levels. Altitude rnges: 5m, 5m & 0m. RAF 0/ - Wy Altitude Control Hydrulic Vlve. Especilly fit for low height wter tnks. Altitude rnges:m, 5m & 0m. RAF 0/ control mode RAF 0 Wy ltitude control vlve Automtic Opertion: Under norml conditions, when the wter level in the reservoir is lower thn the pre set ltitude, the RAF 0 is open. The line pressure used to control the vlve flows from the upstrem through the RAF s control chmber to the downstrem. When the wter level rises the pressure hed under the pilot s membrne rises consequently. When the wter reches its mximum pre set level the pressure overcomes the pilot s spring. The pilot s membrne moves upwrds nd closes the drin. The RAF 0 is closed completely, due to the line pressure. When the wter level drops, the pilot opens gin. Mnul Opertion: Open the RAF 0 overriding the pilot by closing cocks nd nd opening the vent. Close the RAF 0 overriding the pilot by closing cock nd vent nd opening cock. RAF Wy ltitude control vlve Automtic Opertion: Under norml conditions, when the wter level in the reservoir is lower thn the preset ltitude, the RAF is open. When the wter level rises the pressure hed under the pilot s membrne rises consequently. When the wter reches its mximum pre set level the pressure overcomes the pilot s spring. The pilot s membrne moves upwrds nd connects the control chmber to line pressure. The RAF fully closes. When the wter level in the reservoir drops gin, the vlve s control chmber drins to the tmosphere through the pilot s vent. Line pressure supply is closed in prllel. The RAF 0/ fully opens, due to the line pressure. Mnul Opertion: To open the vlve overriding the flot plce the Selecting Cock in Open position. To close the vlve overriding the flot plce the Selecting Cock in Close position. Adjustment: VENT RAF 0 - Two Wy Pilot Adjust the desired ltitude within the llowble rnge using the djustment screw. Turn the screw counterclockwise to lower the control ltitude. C RAF - Three Wy Pilot ADJ. A Stndrd RAF 0: Stndrd RAF : Specil Fetures: Bsic RAF vlve Rilsn Coted Enmel coting Bsic RAF vlve Rilsn Coted Self-clening screen filter Self-clening screen filter Lrge cpcity externl filter Wy Altitude metl pilot ALT Wy Altitude metl pilot ALT Wy Altitude stinless steel pilot Spring set for reservoir mximum Spring set for reservoir mximum Spring set for reservoir mximum level 5m. level 5m. level 5m nd 0m. Reinforced plstic tubing Reinforced plstic tubing Copper or stinless steel tubing Interntionl Compny

16 RAF GENERAL PURPOSE HYDRAULIC VALVES RAF 0/ Two Wy Pressure Reducing Control Vlve Description RAF 0 nd RAF re piloted hydrulic vlves ctivted by line pressure. The pilot vlve hs spring-loded membrne, which is sensitive to downstrem pressure. The pilot s spring is preset to desirble reduced pressure. The pilot vlve mintins constnt downstrem pressure by grdully opening nd closing of the min vlve. The pressure is mintined constnt regrdless of chnges in the flow rte. RAF RAF 0 Typicl Appliction Use RAF 0/ for generl wter supply systems with medium pressure rting. The -wy pilot configurtion together with Rphel s ptented diphrgm enbles smooth nd precise pressure control. Recommended Flow Nominl Dimeter Flow Rte.m /h mm Inch Min. Mx

17 RAF - Generl Appliction twowy Pressure reducing vlve nd metl pilot with built-in needle vlve. Pressure setup up to brs. Dimeters to (DN0 to DN00). RAF 0 - Generl Appliction twowy Pressure reducing vlve with high precision, quick response metl pilot. Pressure setup up to brs. VENT ADJ. RAF 0/ control mode RAF Pressure Reducing Vlve is ctivted by line pressure nd controlled by pilot vlve. The pilot includes spring-loded membrne, which is exposed to the downstrem (controlled) pressure. The displcement of the membrne due to downstrem fluctutions defines the flow inside the pilot. When the downstrem pressure is lower thn desired, the RAF vlve is utomticlly directed to open. In the opposite cse it is utomticlly directed to close. When line pressure is inserted into the control chmber of the RAF vlve (bove its diphrgm) the vlve closes. When the control chmber drins the RAF vlve opens due to the line pressure from below its diphrgm. In two-wy configurtions, the control chmber drins downstrem, enbling fster RAF - Two Wy Metl Pilot nd grdul opening without wter spill. Automtic: When downstrem pressure is lower thn tht of the pilot spring (pre-djusted set point), the RAF s control chmber drins downstrem nd the RAF vlve is opened. When the downstrem pressure rises bove the preset spring lod, the pilot s membrne is forced upwrds closing the pilot s wter pssge. The RAF 0 then closes reducing downstrem pressure. RAF 0- Two Wy Metl Pilot Mnul: To open the RAF 0 nd RAF, close cocks nd nd open the Vent. To close the vlves, open cock nd close cock nd Vent (). Adjustment Use needle vlve to control the RAF 0 nd RAF opertionl speed. Adjust the sustined pressure by the djusting screw. See tble of vilble springs below. Stndrd RAF 0: Stndrd RAF : Specil Fetures: Bsic RAF vlve Rilsn Coted Bsic RAF vlve Rilsn Coted Enmel coting Self-clening screen filter Self-clening screen filter Lrge cpcity externl filter Wy pilot P- wy pilot w/built in needle vlve P- Stinless steel pilot Brss needle vlve - Stinless steel needle vlve Reinforced plstic tubing Reinforced plstic tubing Copper or stinless steel tubing Pressure check point Pressure check point Glycerinted 0mm pressure guge Spring Selection (br) RAF0 Green Stndrd -0 Blue 0.5- red 0.5- Yellow - RAF Green Stndrd - red 0.5- Yellow - Plese Specify: Minimum & mximum flow rtes. Norml line pressure. Interntionl Compny

18 RAF GENERAL PURPOSE HYDRAULIC VALVES RAF B Three Wy Pressure Rreducing Control Vlve Description RAF B re piloted hydrulic vlves ctivted by line pressure. The pilot vlve hs spring-loded membrne, which is sensitive to downstrem pressure. The pilot s spring is preset to desirble reduced pressure. The pilot vlve mintins constnt downstrem pressure by grdully opening nd closing of the RAF. The pressure is mintined constnt regrdless of chnges in flow rte. Typicl Appliction Use RAF B for generl wter supply systems with medium pressure rting. The RAF B is best for Use for wter tretment circultion nd filtrtion networks. The - wy brss pilot is used in cses where downstrem pressure equlizes to upstrem pressure. Recommended Flow Nominl Dimeter Flow Rte M /h mm Inch Min Mx

19 RAF B - Generl Appliction three-wy Pressure reducing vlve with metl pilot. Pressure setup up to brs. RAF B control mode Control mode RAF Pressure Reducing Vlve is ctivted by line pressure nd controlled by pilot vlve. The pilot includes spring - loded membrne, which is exposed to the downstrem (controlled) pressure. The displcement of the membrne due to downstrem fluctutions defines the flow inside the pilot. When the downstrem pressure is lower thn desired, the RAF vlve is utomticlly directed to open. In the opposite cse it is utomticlly directed to close. When line pressure is inserted into the control chmber of the RAF vlve (bove its diphrgm) the vlve closes. When the control chmber drins the RAF vlve opens due to the line pressure from below its diphrgm. As in three-wy control configurtions, the control chmber drins out, enbling the vlve to open fully. Adjustment Adjust pressure set points by the djusting screws of the pilots. See the list of vilble springs below. C RAFB-Three Wy Pilot A Stndrd RAF B: Bsic RAF vlve Rilsn Coted Self-clening screen filter wy brss pilot P- Selecting cock vlve Reinforced plstic tubing Pressure check point Specil Fetures: Enmel coting Lrge cpcity externl filter Stinless steel pilot - Copper or stinless steel tubing Glycerinted 0mm pressure guge Plese Specify: Minimum & mximum flow rtes. Norml line pressure. Set point (downstrem) pressure Spring Selection (br) RAFB Green Stndrd - Red 0.5- Yellow - Interntionl Compny

20 RAF GENERAL PURPOSE HYDRAULIC VALVES RAF / Two Wy Pressure Reducing/Sustining Control Vlve Description RAF nd RAF re piloted hydrulic vlves ctivted by line pressure. Both pilots hve spring-loded membrnes. One pilot is sensitive to upstrem pressure nd the other to downstrem pressure. The combined opertion of the two pilot vlves sustins constnt pressure upstrem of the RAF vlve, nd t the sme time, reduces the downstrem pressure to preset pressure. The RAF vlve opens or closes grdully to mintin both required pressures simultneously. RAF RAF Typicl Appliction Use the pressure reducing/sustining vlve to define two pressure zones long supply line, typiclly, long downhill flow. Use RAF / for generl wter supply systems with medium pressure rting. The elborted -wy commnd with Rphel s ptented diphrgm enbles smooth nd precise pressure control. Recommended Flow Nominl Dimeter Flow Rte.m /h mm Inch Mx

21 RAF -Generl Appliction twowy pressure reducing/sustining control vive. Dimeters.5 to (DN0 to DN00). RAF -Generl Appliction twowy pressure reducing/sustining control vlve. Pressure setup up to brs. ADJ. VENT ADJ. RAF / control mode RAF Pressure Reducing/sustining Vlve is ctivted by the line pressure nd controlled by two pilot vlves. Both pilots include springloded membrnes. The sustining pilot (the left one in the drwings) is preset to sustin the upstrem pressure t preset point. The reducing pilot (on the right) reduces the downstrem pressure nd mintins it t lower preset level. In norml flow regime, the vlve is prtly open to sustin the upstrem pressure nd reduce the downstrem pressure. It prtly closes when the downstrem pressure rises bove the lower set point or when the line pressure drops below the upper set point. It opens gin when the upstrem pressure rises. The control chmber drins downstrem, enbling fster nd grdul opening without wter spill. RAF - Two Wy Pilot Automtic: When line pressure is low, the pilots re positioned s shown. The RAF control chmber is connected to the line pressure, the RAF closes. When the line pressure rises nd overcomes the spring of the sustining pilot (the left one), the pilot s membrne moves upwrd to open its port. Then the RAF s control chmber drins downstrem through the right pilot. The RAF vlve opens nd reduces the upstrem pressure. When the line pressure reduces, the left pilot closes, s does the RAF. If the downstrem pressure is greter thn the set point of the reducing RAF - Two Wy Pilot pilot (on the right), the reducing pilot s membrne moves upwrd nd closes its port. Agin the RAF control chmber is connected to the upstrem pressure nd the RAF closes. Mnul: To open the RAF, close cocks nd nd open the Vent. To close the RAF open cock nd close cocks nd Vent. Adjustment Use needle vlve to control the RAF opertionl speed. Adjust the sustined pressure by the bjusting screw. See tble of vilble springs below. Stndrd RAF : Stndrd RAF : Specil Fetures: Bsic RAF vlve Rilsn Coted Bsic RAF vlve Rilsn Coted Enmel coting Self-clening screen filter Self-clening screen filter Lrge cpcity externl filter Wy pilot P- wy pilot w/built in needle Stinless steel pilot vlve P- Wy pilot P- wy pilot w/built in needle Stinless steel pilot vlve P- Brss needle vlve - Stinless steel needle vlve Reinforced plstic tubing Reinforced plstic tubing Copper or stinless steel tubing Pressure check points Pressure check points Glycerinted 0mm pressure guge Spring Selection (br) RAF Green Stndrd -0 Blue 0.5- red 0.5- Yellow - RAF Green Stndrd - red 0.5- Yellow - Plese Specify: Minimum & mximum flow rtes. Norml line pressure. Set point (sustin) pressure. Interntionl Compny

22 RAF GENERAL PURPOSE HYDRAULIC VALVES RAF B Three Wy Pressure Reducing/Sustining Control Vlve Description RAF B re piloted hydrulic vlves ctivted by line pressure. Both pilots hve spring-loded membrnes. One pilot is sensitive to upstrem pressure nd the other to downstrem pressure. The combined opertion of the two pilot vlves sustins constnt pressure upstrem of the RAF vlve, nd t the sme time, reduces the downstrem pressure to preset pressure. The RAF vlve opens or closes grdully to mintin both required pressures simultneously. Typicl Appliction Use the pressure reducing/sustining vlve to define two pressure zones long supply line, typiclly, long downhill flow. Use RAF B for generl wter supply systems with medium pressure rting with metl pilots. Recommended Flow Nominl Dimeter Flow Rte Mx. mm Inch M /h

23 RAF B control mode RAF Pressure Reducing/sustining Vlve is ctivted by the line pressure nd controlled by two pilot vlves. Both pilots include springloded membrnes. The sustining pilot (the left one in the drwings) is preset to sustin the upstrem pressure t preset point. The reducing pilot (on the right) reduces the downstrem pressure nd mintins it t lower preset level. In norml flow regime, the vlve is prtly open to sustin the upstrem pressure nd reduce the downstrem pressure. It prtly closes when the downstrem pressure rises bove the lower set point or when the line pressure drops below the upper set point. It opens gin when the upstrem pressure rises. The control chmber drins out, enbling the vlve to open fully. RAF B - control mode: Automtic: The three-wy cock should be positioned in A. When the upstrem pressure is low, both pilots re in the lower position s shown. The line pressure flows through ports - of the sustining pilot the left one), flips the shuttle vlve open, nd flows into the RAF control chmber. The RAF closes to sustin upstrem pressure. When the upstrem pressure rises bove the set point, the membrne of the left pilot moves upwrd nd opens its ports -. The RAF control chmber drins this wy (the shuttle vlve remins open). Thus the RAF opens. When the downstrem pressure rises C A RAF B-Three Wy Metl Pilot bove the preset reducing level (right pilot), the right pilot membrne moves upwrds. The line pressure then flows through its ports -, flips the shuttle vlve to the left nd flows into the RAF s control chmber. The RAF closes. The downstrem pressure reduces. Mnul: Use the three-wy cock to close or open the RAF by turning the hndle to C or O, respectively. Stndrd RAF B: Specil Fetures: Bsic RAF vlve Rilsn Coted Enmel coting Self-clening screen filter Lrge cpcity externl filter wy brss pilot P- Stinless steel pilot (configured s Sustining) (configured s Sustining) wy brss pilot P- Stinless steel pilot (configured s reducing) (configured s Reducing) Selecting cock vlve - Reinforced plstic tubing Copper or stinless steel tubing Pressure check point Glycerinted 0mm pressure guge Adjustment Adjust pressure set points by the djusting screws of the pilots. See the list of vilble springs below. Plese Specify: Minimum & mximum Flow rtes. Norml line pressure. Set point (sustin) pressure. Spring Selection (br) RAFB Green Stndrd - Red 0.5- Yellow - Interntionl Compny 0

24 RAF GENERAL PURPOSE HYDRAULIC VALVES RAF 70 Flow Rte Control Vlve Description RAF 70 re piloted hydrulic vlves ctivted by line pressure. Normlly the RAF 70 is prtly open to llow preset constnt flow rte. The flow rte through the RAF 70 is determined indirectly using n orifice plte. The hed loss cross the orifice is proportionl to the ctul flow rte. On rising hed loss, the RAF 70 is utomticlly piloted to close. On the other cse, the vlve opens. Thus the flow rte is mintined constnt, regrdless of line pressure fluctutions or the downstrem demnd. Typicl Appliction Use RAF 70 Flow Rte Control vlve to mintin compensted constnt flow rte to limit the flow downstrem. RAF 70 hs two-wy metl pilot vlve for generl use in wter supply systems of medium pressure rting. Apply RAF 70 to eliminte excessive pumping or to limit the wter demnd. Recommended Flow Nominl Dimeter Flow Rte Mx. mm Inch M /h

25 RAF 70 - Generl Appliction twowy Flow Rte Control Hydrulic Vlve. Pressure rting up to brs. ADJ. RAF 70 control mode RAF Flow Rte Control Vlve is ctivted by line pressure nd controlled by pilot vlve. The pilot includes spring-loded membrne. An orifice plte is instlled either downstrem or upstrem of the RAF. The orifice size is prepred in dvnce to suit the specified required flow rte. The hed loss cross the orifice is proportionl to flow rte through the RAF vlve. This hed loss is trnsferred to the opposite sides of the pilot s membrne, which moves upwrd or downwrd ccordingly. These movements open or close the inner ports of the pilot vlve, directing the line pressure to control the RAF 70. In two-wy configurtions, the control chmber drins downstrem, enbling fster nd grdul opening without wter spill. In three-wy configurtions, the control chmber drins out, enbling the vlve to open fully. RAF 70- control mode: Mnul: To open the RAF 70, close cocks nd nd open the Vent. To close the RAF open cock nd close cock nd Vent. Automtic: In norml flow rte the RAF 70 is open. The hed loss cross the orifice is low, nd the pilot membrne is mintined in its lower position, s shown. The line pressure flows through the open pilot, ports -, nd drins downstrem. When the flow rte through the vlve increses, so does the hed loss cross the orifice. When the hed loss is higher thn preset, the pilot membrne is pushed upwrd closing port. VENT RAF 70 - Two Wy Pilot 5 + OR. The RAF is forced to close by line pressure. The flow rte decreses s does the hed loss cross the orifice. The pilot s membrne moves bck nd the RAF grdully reopens. Adjustment Use the needle vlve to control the RAF 70 opertionl speed. Adjust the opertionl set point by the djusting screw. See the list of vilble springs below. - Stndrd RAF 70: Specil Fetures: Bsic RAF vlve Rilsn Coted Enmel coting Self-clening screen filter Lrge cpcity externl filter wy metl pilot P-00 wy metl pilot P-0 Brss Needle vlves - Orifice plte Reinforced plstic tubing Copper or stinless steel tubing Plese Specify: Mximum permissible pressure drop. Flow rte (Set point) Interntionl Compny

26 RAF GENERAL PURPOSE HYDRAULIC VALVES RAF Q Quick Pressure Relief Cotrol Vlve Description RAF Q is piloted hydrulic vlve ctivted by line pressure. The twowy pilot vlve hs spring-loded membrne, which is sensitive to upstrem pressure. The RAF Q is normlly closed. As line pressure rises bove the preset level, the vlve opens quickly to relieve the excessive pressure. Quick pressure relief vlve protects wter systems from quickly rising excessive pressure, due to wter hmmer surge. It is recommended to instll RAF Q t the system hed, right next to the min supply line or booster pump. RAF Q - Generl Appliction twowy Pressure Relief vlve. Pressure rting up to brs. The RAF Q is supplied in two stndrd configurtions, both with metl pilots: smll sizes (up to ) nd medium size ( - ). Typicl Appliction RAF Q vlve relieves excessive line pressure to protect from pressure surge Use RAF Q for generl wter supply systems with medium pressure rting. The elborted two-wy pilot with Rphel s ptented diphrgm enbles smooth nd precise pressure control. Recommended Flow Nominl Dimeter Flow Rte Mx. mm Inch Mx

27 RAF Q control mode RAF Q Pressure Relief Vlve is ctivted by line pressure nd controlled by pilot vlve. The pilot includes spring-loded membrne, which is exposed to line pressure. The displcement of the membrne due to rise of line pressure ginst the spring force chnges the wter flow inside the pilot. The RAF Q is normlly closed. Only when the line pressure is higher thn the preset vlue, the RAF Q is piloted to open. RAF Q- control mode Automtic: When line pressure is low, the pilot is closed s illustrted. The RAF Q remins closed by line pressure. When line pressure is higher thn the set point of the pilot, the spring is bised, enbling the membrne to move upwrd under the line pressure. The inner port of the pilot opens; the RAF control chmber drins through the vent. Then the RAF Q opens nd relieves the excessive pressure. Adjustment RAF Q - Quick Pressure Relief Control Vlve Use needle vlve to control the RAF Q opertionl speed (The needle vlve should be between 0.5 to turns open). Adjust the sustined pressure by the djusting screw. See tble of vilble springs below, when regulting pressure relief vlve it is recommended to fully Stndrd RAF Q / - : Stndrd RAF Q - : Specil Fetures: Bsic RAF vlve Rilsn Coted Bsic RAF vlve Rilsn Coted Enmel coting Self-clening screen filter Self-clening screen filter Lrge cpcity externl filter wy pilot w/built in Wy pilot P- Stinless steel pilot needle vlve P- - Brss needle vlve Stinless steel needle vlve Reinforced plstic tubing Reinforced plstic tubing Copper or stinless steel tubing Pressure check point Pressure check point Glycerinted 0mm pressure guge Spring Selection (br) RAF / - RAF - Green Stndrd - red 0.5- Yellow - Green Stndrd -0 Blue 0.5- red 0.5- Yellow - Interntionl Compny

28 RAF GENERAL PURPOSE HYDRAULIC VALVES RAF / Two Wy Pressure Sustining/Relief Control Vlve Description RAF nd RAF re piloted hydrulic vlves ctivted by line pressure. The pilot vlve hs spring- loded membrne, which is exposed to the upstrem pressure. The vlve is normlly closed. Only when the line pressure rises bove preset point, the RAF / opens to relieve the excessive pressure downstrem without cusing surge hzrds. When the line pressure drops the RAF closes. RAF RAF Typicl Appliction Use the pressure sustining/relief vlve to mintin constnt upstrem pressure nd to void undesirble high pressure. This protection is required for most irrigtion devices, domestic nd industril utilities. Use RAF / for generl wter supply systems with medium pressure rting. The elborted -wy commnd with Rphel s ptented diphrgm enbles smooth nd precise pressure control. Recommended Flow Nominl Dimeter Flow Rte Mx.M /h mm Inch Mx

29 RAF Generl Appliction two-wy Pressure sustining/relief vlve. Pressure setup up to brs. Dimeters / to (DN0 to DN00). RAF Generl Appliction twowy Pressure sustining/ relief vlve. Pressure setup up to brs. RAF / control mode RAF Pressure Sustining/Relief Vlve is ctivted by line pressure nd controlled by pilot vlve. The pilot includes spring-loded membrne. A sustined pressure is preset by djusting the pilot retining spring. The pilot is connected to line (upstrem) pressure. The displcement of the pilot spring-loded membrne due to upstrem pressure defines the flow directions inside the pilot. When the upstrem pressure is higher thn the set point, the RAF vlve is piloted to open. The excessive line pressure is relieved downstrem. Otherwise the RAF remins closed, mintining constnt upstrem pressure. As in two-wy configurtions, the RAF s control chmber drins downstrem, enbling fster nd grdul opening without wter spill. RAF - Two Wy Pilot Mnul: To open the RAF, close cocks nd nd open the Vent. To close the RAF open cock nd close cock nd Vent. Automtic: When the upstrem pressure is lower thn tht of the sustined pressure set point, the RAF control chmber is connected to the line, s illustrted. The RAF is closed. When the upstrem pressure rises bove the set point, the pilot s membrne is forced upwrd. Adjustment VENT Use needle vlve to control the RAF opertionl speed. Adjust the sustined pressure by the djusting screw. See tble of vilble springs on the next pge. ADJ. RAF - Two Wy Pilot Port opens, the control chmber of the RAF drins downstrem nd the RAF opens to relieve the excessive pressure. Stndrd RAF : Stndrd RAF : Specil Fetures: Bsic RAF vlve Rilsn Coted Bsic RAF vlve Rilsn Coted Enmel coting Self-clening screen filter Self-clening screen filter Lrge cpcity externl filter Wy pilot P- wy pilot w/built in needle Stinless steel pilot vlve P- Brss needle vlve - Stinless steel needle vlve Reinforced plstic tubing Reinforced plstic tubing Copper or stinless steel tubing Pressure check point Pressure check point Glycerinted 0mm pressure guge Spring Selection (br) RAF RAF Green Stndrd -0 Blue 0.5- red 0.5- Yellow - Green Stndrd - red 0.5- Yellow - Plese Specify: Minimum & mximum flow rtes. Norml line pressure. Set point (sustin) pressure. Interntionl Compny

30 RAF GENERAL PURPOSE HYDRAULIC VALVES RAF B Three Wy Pressure Sustining/Relief Control Vlve Description RAF B re piloted hydrulic vlves ctivted by line pressure. The pilot vlve hs spring- loded membrne, which is exposed to the upstrem pressure. The vlve is normlly closed. Only when the line pressure rises bove preset point, the RAF B opens to relieve the excessive pressure downstrem without cusing surge hzrds. When the line pressure drops the RAF re-closes. Typicl Appliction Use the pressure sustining/relief vlve to mintin constnt upstrem pressure nd to void undesirble high pressure. This protection is required for most irrigtion devices, domestic nd industril utilities. RAF B - Generl Appliction three-wy Pressure sustining/ relief vlve with metl pilot. Pressure setup up to brs. Recommended Flow Nominl Dimeter Flow Rte Mx. mm Inch M /h

31 RAF B control mode RAF Pressure Sustining/Relief Vlve is ctivted by line pressure nd controlled by pilot vlve. The pilot includes spring-loded membrne. A sustined pressure is preset by djusting the pilot retining spring. The pilot is connected to line (upstrem) pressure. The displcement of the pilot springloded membrne due to upstrem pressure defines the flow directions inside the pilot. When the upstrem pressure is higher thn the set point, the RAF vlve is piloted to open. The excessive line pressure is relieved downstrem. Otherwise the RAF remins closed, mintining constnt upstrem pressure. As in three-wy configurtions, the RAF s control chmber drins out, enbling the vlve to open fully. RAF B - control mode Automtic: The three-wy cock should be positioned t A. When the upstrem pressure is low, the pilot s membrne is in its lower position s illustrted. The RAF control chmber is exposed to line pressure through the ports - of the pilot. The RAF closes to sustin the upstrem pressure. When the upstrem pressure is higher thn preset, it overcomes the pilot spring nd force the pilot membrne to move upwrd. Then ports - open nd port closes. The RAF B control chmber drins nd the vlve opens to relieve the excessive pressure downstrem. RAF B - Three Wy Metl Pilot Mnul: Use the three-wy cock to close or open the RAF by turning the hndle to the C or O positions, respectively. Adjustment Adjust pressure set points by the djusting screws of the pilots. See the list of vilble springs below. C A Stndrd RAF B: Specil Fetures: Bsic RAF vlve Rilsn Coted Enmel coting Self-clening screen filter Lrge cpcity externl filter wy brss pilot P- Stinless steel pilot Selecting cock vlve - Reinforced plstic tubing Copper or stinless steel tubing Pressure check point Glycerinted 0mm pressure guge Spring Selection (br) RAF B Green Stndrd - red 0.5- Yellow - Interntionl Compny

32 RAF GENERAL PURPOSE HYDRAULIC VALVES RAF Surge Anticipting Control Vlve Description RAF is djusted to eliminte hzrdous pressure surges typicl of wter hmmer conditions. A wter hmmer is cused by n brupt shutoff of pump or rpid closure of min vlve, cusing fst propgtion of low-pressure front, followed by n extremely highpressure bck-wve. A series of pressure wves, ech one composed of lternting low nd high pressure is creted within few seconds. RAF is piloted hydrulic vlve ctivted by line pressure. The vlve hs two pilots, for high nd low pressure. Under norml conditions the RAF is closed. It opens when the line pressure drops below preset pressure, in nticiption to the following surge, nd remins open until the fluctutions subside. Typicl Appliction RAF is locted next to booster pump to protect the supply line downstrem of the pump from wter hmmer dmges. Use surge-nticipting vlve to protect wter lines ginst wter hmmer dmges. Uphill supply lines of considerble length nd lrge dimeter pipes re more susceptible to wter hmmer dmges. For more info or hzrd nlysis of prticulr network consult Rphel Engineers. Recommended Flow Nominl Dimeter Flow Rte M /h mm Inch Mx

33 RAF control mode RAF Surge Anticipting hydrulic Vlve is ctivted by line pressure nd controlled by two pilot vlves. Both pilots include spring-loded membrnes. The low-pressure pilot (the left one in the drwings) is preset to open the RAF grdully when the line pressure drops bout 0m below norml. The high-pressure pilot (on the right) is preset to open the RAF when the line pressure rises bout 0m bove norml. The RAF is normlly closed. Only when the line pressure drops below or rises bove the preset limits, the RAF is piloted to open. A wter hmmer event strts with considerble pressure drop, which cuse the RAF to open. Then, s the wter wve rolling bckwrd, the vlve remins open nd let the pressure out to diminish its impct. RAF - control mode Mnul: To open the RAF, close cocks, nd nd open the Vent. Automtic: The RAF is normlly closed. Ensure tht ll cock vlves (except the vent) re fully open. Normlly, line pressure is higher thn the set point of the low-pressure pilot (the left one), but lower thn tht of the high-pressure pilot (the right one). Thus, ports in both pilots re closed. There is no flow from the min line to the pilots. MAIN LINE The RAF control chmber is connected directly to the line pressure through needle vlve. The RAF is closed. When line pressure drops below the lower set point, the spring of the low-pressure pilot (left) push the pilot s membrne downwrd nd on the wy opens port, s shown in the drwing. The right pilot does not chnge. The RAF control chmber drins out through port -Vent b of the left pilot. The RAF opens in nticiption to surge. The pressure drop is soon followed by surge, which closes the left pilot but opens the right one (the high pressure pilot) t the sme b ADJ. time. The RAF control chmber now drins through ports - of the right pilot nd thus remins open. The high-pressure wve is llowed to flow through. After the surges subside, nd the line pressure returns to norml level, both pilots close nd the RAF follows suit. Adjustment VENT RAF - Surge Anticipting Hydrulic Vlve Use needle vlve -b to control the RAF opertionl speed. Adjust the low nd high pilot s set points by the djusting screws. See list of vilble springs below. ADJ. Stndrd RAF : Specil Fetures: Bsic RAF vlve Rilsn Coted Enmel coting Self-clening screen filter Lrge cpcity externl filter wy pilot P- wy high cpcity pilot P--/ wy pilot P-B wy high cpcity pilot P-B-/ Brss needle vlves - Reinforced plstic tubing Copper or stinless steel tubing 0mm pressure guge Glycerinted 0mm pressure guge Spring Selection (br) RAF Green Stndrd -0 Blue 0.5- red 0.5- Yellow - Interntionl Compny 0

34 RAF GENERAL PURPOSE HYDRAULIC VALVES RAF Anti-Burst Control Vlve Description RAF re piloted hydrulic vlves ctivted by line pressure. Normlly the vlve is open. Only in cse of flow rte higher thn preset mximum, due to burst or excessive demnd downstrem, the RAF /9 re utomticlly closed down nd cn reopen mnully. The ctul flow rte through the RAF is determined by compring the hedloss cross n orifice plte. The vlve is closed down by hydrulic rely. Typicl Appliction RAF vlve controls wter supply network downhill of reservoir. Use Anti-Burst Control vlve to eliminte wter loss nd dmge due to piping burst. The vlve is best in networks susceptible to burst due to old piping, vndlism or pressure surge. The RAF fetures metl pilot vlve nd hydrulic rely to ensure precise nd relible response in generl use. Recommended Flow Nominl Dimeter Flow Rte Mx. m m Inch M /h

35 RAF - Generl Appliction two-wy Anti-Burst Control Hydrulic Vlve. Pressure rting up to brs. Hydrulic rely gurntees tight closing nd mnul reopening. ADJ. RAF control mode RAF Anti-Burst Control Vlve is ctivted by line pressure nd controlled by pilot vlve. The pilot includes springloded membrne. An orifice plte is instlled downor upstrem of the RAF. The orifice size is prepred in dvnce to suit the specified mximum llowble flow rte. The hed loss cross the orifice is proportionl to flow rte through the RAF. This hed loss is trnsferred to the opposite sides of the pilot membrne. When it exceeds the preset point of the pilot s spring, hydrulic rely is operted to close down the RAF. The RAF is reopened only mnully. RAF - control mode Mnul: Use the mnul override option of the hydrulic rely. Automtic: Set the mnul override hndle of the hydrulic rely on utomtic position (designted R). In norml flow rte, the pilot is closed, s shown. The RAF control chmber is llowed to drin out through the rely s vent. The RAF is fully open. When the hed loss cross the orifice exceeds the preset level, the pilot membrne is pushed upwrd with its plunger. The line pressure flowing vi pilot ports - flips the hydrulic rely to its other position (designted R). The line pressure is then directed to the RAF s control R R VENT VENT RAF - Two Wy Pilot s b Adjustment OR. Use the needle vlve to control the RAF opertionl speed. Adjust the opertionl set point by the djusting screw. See the list of vilble springs below chmber. The RAF closes. After the problem is fixed, reopen the RAF by resetting the hydrulic rely mnully nd shift bck to uto position. Stndrd RAF : Specil Fetures: Bsic RAF vlve Rilsn Coted Enmel coting Self-clening screen filter Lrge cpcity externl filter wy metl pilot P-00 wy metl pilot P-0 Brss Needle vlves - Orifice plte - wy hydrulic rely - Reinforced plstic tubing Copper or stinless steel tubing Plese Specify: Mximum flow rte (Set point) Interntionl Compny

36 Rphel Vlves Industries (975) Ltd. my modify ny detils or product specifictions RAF-0 described in this publiction t ny time, without prior notice, for technicl or other resons. Interntionl Compny North Industril Zone Or-Aqiv 000, P.O.Box 555, Isrel TEL , Fx E-mil:[email protected]