Directional seated valves Directly actuated, leakagefree for hydraulic systems For the assembly on connection sub-plates

Transcription

1 Directional seated s Directly actuated, leakagefree for hydraulic systems For the assembly on connection sub-plates Valve for sub-plate mounting Section Pressure p max (700) bar Valve with individual connection sub-plate Section 5 Flow Q max l/min Directional bank D 70. General information Directional control s are generally used for the direct, leakage free control of consumers and as pilot s for hydraulically actuated s (depending on the flow pattern). They are designed as spring returned ball seated s. The elements are forced into their respective switching position against the spring force and fluid pressure by various actuation elements via an elbow lever acting on a pin. A strainer insert in the inlet port prevents the entry of coarse contamination. The fluid ducts end as holes with O-ring seals at the ground, bottom surface of the body. Pipes may be connected either via customer furnished connection blocks or sub-plates (for individual s with sub-plates see sect. 5 or for banks see D 70). These s do not show any leakage in blocked switching position. Reliable shifting is ensured, as these s are designed as ball seated s where there is no seizing or sticking in working position under full pressure. The leverage between actuation and element ensures low actuation forces and smooth shifting. To avoid interaction, most of these directional control s are available with check inserts and return pressure stops or orifice inserts to limit the inflow of oil. Individual s with sub-plate, enabling direct pipe connection, may be equipped with a by-pass check, a pressure limiting, or a rectifier circuit by means of check s.. Overview (For complete type overview, see sect. 8) Individual for manifold mounting Individual with connection sub-plate for direct pipe connection e.g. GS --G 4 e.g. GZ -R-/8-G 4 Solenoid actuated /-way directional seated, size, free flow when deenergized Solenoid actuated /-way directional seated, size with check insert in port P Tapped ports in the connection sub-plate, G /8. Actuation modes For detailed data. see section 4++. (Max. pressure rating depending on flow pattern and size. see sect.. table ) Solenoid Pressure hydraulic pneumatic Mechanical roller pin feeler Manual turn-knob Code letter Picture and symbol G WG H P K T F D HAWE HYDRAULIK SE STREITFELDSTR MÜNCHEN D 700 Directional seated s 980 by HAWE Hydraulik May 007-0

2 D 700 page. Individual s, manifold mounting. Valve Order example: GR - R - G 4 Solenoid actuation (acc. to sect. 4.) G = DC WG = AC For actuation modes H, P, K, T, F, D, see sect. and (For individual s with connection sub-plate for pipe connection, see sect. 5) solenoid voltage (standard) G 4 = 4 V DC; WG 0 = 0 V AC see sect. 4. Additional element (see table ) and main data (see table ) Table : Flow pattern Coding /-way /-way /-way 4/-way 4/-way R ) S ) ) Z ) ) 4 ) ) Z4 ) ) Detailed symbols (must be completed by actuation symbol) ) Not available for size 4! Note the arrangement of solenoids a and b in relation to the ports A and B, see dim. drawings sect... ) Only available for size ) also available as explosion-proof version, see sect. 4.. Simplified flow pattern symbol Table :, main data Coding 0 4 Max. flow approx. lpm Directional s (... -way) /; / / 4/ /; /; /; 4/ 4/ /; /; / 4/ /; /; / 4/ /; /; / Pressure p max (bar) Solenoid actuation Pressure actuation Mechanical actuation Manual actuation Type G.. a. WG.. Type H.. Type P.. Type K.. Type T.. Type F.. Type D ) ) ) For max. pressure during shifting, see sect. 4. Table : Coding and symbol R B S Additional elements to influence shifting operations, inserted in port P or R (can be retrofitted). Additional element for size all all Type Insert check s type ER acc. to D 75 e.g. type ER 0 for s size 0 size 0 = EB 0-0,6 = EB -0,8 = EB -, = EB -,5 4 = EB 4-4, a 7 000b Insert orifices type EB acc. to D 6465 Return pressure stop A combination with check or orifice in port P is possible e.g. G - BS-G 4, GZ - RS-G 4 Note Installation illustration Check or orifice installed in port P Return pressure stop installed in port R Not avail. for /- and 4/-way directional spool s type... and... The check prevents an uncontrolled impact or reflow R P or A P, e.g. if the inlet pressure at P drops below the consumer pressure at A (during idle position or actuation of another consumer with a lower pressure requirement) when several s are connected in parallel. A pressure reduction is prevented during such switching operations. Not available for 4/-way s type...! The orifice serves to limit the flow (see p-q curves) and should be installed if flow rates higher than Q max (table ) can occur while switching from P A(R): Hydraulic accumulators on the pump side P or in the case of hydr. servo operation of directional spool s with control oil supply from the high flow main gallery. Only available for /-way s types..-.. or..z-... Check s may be installed in the reflow ports R of /-way s size 0and. With parallel shifting of several s, they prevent pressure surges from migrating via the common reflow gallery into non-operated, easily moving and unloaded consumers if there is a connection A R, thus preventing uncontrolled extension movements. Such pressure surges can be caused by shifting operations. These check s are not intended for blocking off hydraulic oil, which depending on the combination of switching operations of other s, can arise at port R.

3 D 700 page. Further characteristic data.. General and hydraulic parameters Description Design Mounting type and leeds connection /-, /-, /, 4/- and 4/-way Seated ball Manifold mounting 0 4 corresp. to nom. size Installation position Any; Vertically with actuation up (best) Direction of flow Only in arrow direction acc. to flow pattern in sect.. The location of ports P (pump), R (return flow), A and B (consumers) are dictated by the internal design and can't be readily interchanged. Overlap Negative, i.e. the transition from shifting pos. 0 into a and vice versa is gradual, with /-way s all ports may be interconnected during this state. See also sect.. (table ) Additional orifice! Operation pressure See sect... All ports may be subject to the full oper. pressure, but a pressure drop must be maintained in flow direction acc. to the flow pattern in sect.., i.e. P A(B) R. With 4/-way s connection R must be employed as return flow only. For permissible pressure during switching operations, see sect. 4.. Static overload capacity Approx. x p max, applies only to s in idle position (p max from table sect..) Flow rating See sect... Pay attention to the area ratio of double acting consumers (differtial cylinders), i.e. the return might be higher than the inflow. Pressure fluid Hydraulic oil conforming DIN 554 part to : ISO VG 0 to 68 conforming DIN 559 Viscosity limits: min. approx. 4, max. approx. 800 mm /s Optimal operation: Approx mm /s Also suitable for biological degradable pressure fluids types HEPG (Polyalkylenglycol) and HEES (Synth. Ester) at service temperatures up to approx. +70 C. For other fluids see sect. 6.. Temperature range Ambient: Approx C; Fluid: C, note the viscosity range! Restriction for version with ex-proof solenoid: Ambient: C; Fluid: max. 70 C Permissible temperature during start: -40 C (observe start-viscosity!), as long as the service temperature is at least 0K higher for the following operation. Biological degradable pressure fluids: Observe manufacturer s specifications. Considering the compatibility with seal material not over +70 C. Attention: Observe the restrictions regarding the perm. duty cycles of the solenoids in sect. 4. and limits for the explosion-proof solenoids in sect. 4..! /- and /-way s Additional elements (the figures for p P A(R) below are to be added!) Check Back pressure p (bar) 0 4 Flow rate Q (lpm) Flow rate Q (lpm) Flow rate Q (lpm) Back pressure p (bar) Curve a: P A and A R /-, 4/- and 4/-way s Curve b: P R p-q curves (guideline) Oil viscosity during tests approx. 60 mm /s Orifice Back pressure p (bar) 0 4 Back pressure p (bar) Flow rate Q (lpm) Flow rate Q (lpm) Flow rate Q (lpm) Curve c: P A(B) Curve d: A(B) R

4 D 700 page 4. Dimensions, only. For the dimensions of the actuations see sect All dimensions are in mm and are subject to change without notice!.. /- and /-way s Coding.R-..,.S-..,.-..,.Z-.. Port A is internally blocked at /-way s, but an O-ring must be installed if the is mounted on a sub-plate. 0 and and 4 0: 6.5 Nm : 9.5 Nm : Nm : 46 Nm 4: 80 Nm : Countersinking of the mounting thread 0 L L B H a a b b c c e e f f g M5 M6 M8 M0 k m /-way Coding.4-.. or.z4-.. Holes in the manifold and sealing of the ports by O-rings ) O-ring Ports #d O-ring NBR 90 Sh For dimensions of the, see sect... (size )! /- and /-way 4/- way 0 4 P and R A P and R A P A and R P A and R A, P and R P A, B and R x.5.5x. 8x.5 5x.5 4x 0x. 7.x.6.95x.6 KANTSEAL seal ring x.5 5x.5 ) Port B (G/4) is unplugged, at versions with sub-plate acc. to section 5 or when installed in a bank type VB... acc. to D 70 M6 ) Available as a complete seal kit (see sect. 4.5).

5 D 700 page 5.. /- and 4/-way s /-way Coding L B H a b c e f g M5 M6 M8 M0 M h i k l m n o /-way Coding.-.. Attention: Both return ports R have to be connected, as there is no internal connection. 0 L B H a b c e 7 f g M5 M6 M8 M0 h i l m n 7 o P, R, A and B Holes in the manifold and sealing of the ports by O-rings ) Ports 0 Ø d P, R, A a. B O-ring P 6x.5 8x.5 4x 7.x.6 R, A and B 6x.5 5x.5 0x..95x.6 ) Available as a complete seal kit (see sect. 4.5).

6 D 700 page 6 4. Actuation modes 4. Solenoid actuation (standard) The solenoids are built and checked conforming to VDE The standard solenoids are designed for the following voltage: 4V DC (type G..) or 0V AC 50 and 60 Hz (type WG..) acc. to sect... It is not required to add these voltages to the order coding. Special voltages have to be specified in uncoded text or to be added to the order coding. See order examples in sect.. and "Special voltage" in sect Valve type acc. to sect G... WG... ) G... WG... ) G... WG... G... WG... G... WG... Nom. voltage U N V DC, 4 V DC, 0 V DC, 0 V AC see also sect. 4.. Nom. current I N ) (A) Nom. power P N ) (W) Switching time on (ms) (guideline) off (ms) ) 50 4 ) Switchings per hour / h Approx. 000 (G.. and WG.. all sizes); approx. evenly distributed Protection mode IP 54 acc. to IEC 6059 (readily assembled), IP 67 acc. to IEC 6059 for explosion-proof version Isolationsklasse F H Cut-off energy (Ws) Connection scheme of the plugs Plug conf. EN A Adapters for size 0 and, see sect. 4.. Guideline for max. value + approx. 0% according to tests with nom. voltage and 0 C ;? < > ) = > = > = > ; < = >? Plug MSD ) Plug MSD ) Plug conf. EN A, e.g. MSD -09 ) Adapter + Socket A MSD -MSD + MSD 4-09 P0 ) Adapter + Socket A MSD -MSD WG + MSD -09 ) Type G... Type WG... Permissible operation conditions for outdoor use Rel. duty cycle These connectors ) are part of the order coding as standard. For other connectors e.g. with clamp diode, economy circuit or LED's see D 76. The solenoid s are suitable for normal outdoor use, if the solenoids are installed vertcall (indicated by previous experience). 00% ED (stamped on the solenoid), however observe operating duty cycle! Rel. duty cycle during operation Rel. duty cycle (Cycle time) tein tr = 00(% ED) T Time Ambient temperature } U ( C) Version for size 4 Version for size 0 to The curves do apply to stand-alone, individual s only! If the s are installed in a cabinet, it should be always equipped with louvers! In case of bank arrangement and ambient temperatures above 40 C the layout should be designed in such a way that adjoining solenoids are not energized over prolonged periods. Rel. duty cycle (%ED) Continuous operation Increased switchable pressure (other than listed in sect..) for size, and 4 With load cycles 0% ED Ambient temp. 40 C (not 4/-way s type...) Type Valves size p max Q max 5) (bar) (lpm) Valves size p max Q max 5) (bar) (lpm) Valves size 4 type GR -4-G.. p max (bar) Q max 5) (lpm) G... a. WG ) Only with adapter, see sect ) The electrical data for solenoids G and WG are only a guideline (max) and may vary depending on manufacturer. ) Co. K + B GmbH, D Rottenburg a.d.l.; This type of plug must be specified, when placing a separate orders. 4) Possibly increased tolerance, above 50 bar. 5) Attention: The storage capability of high pressure consumers has to be taken into consideration. Pressure surges during decharging, which might harm internal functional parts of the or fatigue fracture of other hydraulic components of the application can be prevented by installing orifices (see sect..) upstream.

7 D 700 page Plugs for s size 0 and size The standard version comes with a plug (see dimensional drawing and connection scheme) Order example: GR - -A 4 Directional seated acc. to section. Coding Solenoid voltage 4V DC Plug type G WG A N Note Central plugs (serie) Valve with adapter and bridge rectifier (socket) The bridge rectifier is incorporated in the adapter for size 0 Valve with adapter for plugs shape A DIN EN is customer furnished Valve with adapter and, plug shape A DIN EN Socket 0 MSD MSD MSD -MSD WG + MSD -09 MSD -MSD + MSD 4-09 P0 MSD -MSD MSD -MSD MSD -MSD + MSD -09 MSD -MSD + MSD Solenoid voltage Attention: It is important to specify the voltage! Examples: GR - - G 4 (I 0 = 0.54 A) G -0R - A 0 (I 0 = 0.5 A) WGZ 4- - W 00 (I 0 = 0. A) The indicated nominal power ratings are approximate reference values, which may differ insignificantly depending on the voltage and the manufacturer of the solenoid. The current rating in cold state is I 0 = P N / U N (see examples) ) Notes for proper selection: DC:The order specification (solenoid) should be identical with the one of the power supply (DC). If the supply voltage is lower it will reduce the force of the solenoid, if it is higher the solenoid will be heated up unpermissibly (tolerance ± 5-0%). AC:The order specification should be identical with the one of the power supply (50/60 Hz AC). The voltage of the solenoid is approx. 0.9 U AC - V due to the corresponding bridge rectifier. The table identifies the solenoids utilized in such cases (e.g. for 0 V AC 50 Hz; solenoid with U N = 98 V DC) Order specification 0 4 DC ) AC ) (Nominal power P N ) (& U N [V]) 50/60 Hz (6 W) (0 W) (6 W) (50 W) (86 W) G x x x x x G ex x ( W) G 4 WG...-WG 4 x x x x x G 4ex x ( W) G 6 WG...-WG 4 x x G 4 WG...-WG 48 x x x G 48 x x x x G 80 x x x x G 80ex x ( W) G 98 WG...-WG 0 x x x x x G 0 x x x x G 0ex x ( W) G 5 x x x G 85 WG...-WG 00 x x x (80V DC) x G 05 WG...-WG 0 x x x x x G 0 x x x Note: Only 40 % ED are permissible if the s are neighboring, it is additionally recommended that neighboring s are not actuated simultaneously. Explosion-proof solenoids Connection scheme of the plugs PE Housing Attention: - Flow pattern and not available with explosion-proof solenoids - Protect the complete against direct sun light Electrical data for explosion-proof solenoids Letter of conformity TÜV-A-0 ATEX 007 X Coding II GD T5 C IP67 EEx d IIB T4 Duty cycle 00% ED Protection class IP 67 (IEC 6059) Nom. voltage U N 4 V DC Power, hot P N W Restrictions for use: Temperature Ambient: max. +40 C Fluid: max. +70 C Required external fuse (conf. DIN IEC 7) I N <.6 A-medium Surface protection Protect against direct sun ligth see also restriions at Temperature ) Electrical connection x0.5 mm Cable length m, Option 0 m Observe the operation manuals B 0/004 and B ATEX! Electrical lay-out and testing conforming EN 5004, VDE 070/07 T and T9.

8 D 700 page Unit dimensions All dimensions are in mm and are subject to change without notice! 0 and 4 Suited for leeds Ø6 approx.4 For dimensions see size 4 approx.4 Plug may be installed rotated by 80 May be installed rotated by.5 ) Adapter for plugs DIN (ISO 4400) 4 ) May be installed rotated by 90 ) Adapter plug acc. to sect. 4.., for dimension see size 4 D H max h max a with explosion-proof solenoids May be installed rotated by 90 ) Manual emergency Adapter may be installed rotated by 80 ) It is not possible to install the plug in any position if the is part of a bank (see D 70) ) Either in upward or downward bank (see D 70) ) This dimension is depending on the manufacturer and may be up to 40 mm more DIN ) The bridge rectifier is incorporated in the adapter with type WG.. size 0 and with size it is part of the plug Twist stop Manual emergency operation 0 4 Max. actuation force (N) Cross sectional drawing and Note Press the actuation pin hidden under the rubber cap. Push the emergency actuation pin inward by means of a screw driver or similar, if required The manual emergency actuation may be put out of function by blocking the tapped hole by means of a screw M x5 DIN 9

9 D 700 page 9 4. Hydraulic and pneumatic actuation The actuation element is a single acting piston with spring return. The will remain in its working position a as long as the control pressure prevails. It will return automatically in its idle position 0 if the control pressure is relieved. The piston is sealed and operates without any leakage. Actuation Control medium Coding Hydraulically ( 0... ) Oil H... Pneumatically (,, ) Compressed air, filtered and oiled P... a/f ) conforming DIN ISO 8/ (BSPP) 0 Control pressure (bar) max min Control volume (cm ) D All dimensions are in mm and are subject to change without notice! H a/f Temperature (ambient and control medium) -40 to + 80 C -0 to + 70 C 4. Mechanical actuation The actuation element is a pin (tracer) with spring return, which may be used either directly for vertical directions of operation or via a roller lever for lateral directions. The is in working position a if the actuation element is forced into the hatched area of the lever path. Actuation mode Code letter Dimensional drawing Roller lever switching curve operation direction Roller lever (,, ) Feeler pin ( and ) K... T... dead motion Do not use as a stop! Do not use as a stop! Switching force range s (N) 5 to 8 4 to to 80 5 to to 0 Switching Start of function (H + h) 8.5 ± ± ± path Function path h 0.5 ± ±0.5 0 ± (mm) Switching position range s ±0.5 4 ±0.5 6 ± All dimensions are in mm and are D subject to change without notice! d H H a b c

10 D 700 page Manual actuation Feeler lever coding F: Turn knob coding D: Actuation mode Code letter Dimensional drawing The actuation element is a feeler lever which acts on a spring loaded pin. Switching position a is retained as long as the feeler lever is pressed down within the hatched area.v This actuation element is with detent. Switching position a or 0 alternate as the knob is turned by 90. The direction of rotation is arbitrary. Feeler lever (size,, ) Turn knob (size 0,, ) F... D... Not to used as a stop! Switching position 0 Actuation force in the range s (N) 5 to 8 4 to to Switching torque (Ncm) Actuation travel (mm) h max s All dimensions are in mm D and are subject to H change without notice! B Seal kits These seal kits contain the O-rings listed in sect.. and additional parts and seals. For more detailed information, see spare parts lists E 700-0, E 700-, E 700-, E 700- and E Flow pattern..r..s....z..4..z4 0 4 Seal kit for actuation G, WG, K, T, F and D H and P x DS x DS x DS x DS 700- x DS 700- x DS 700- x DS 700-N x DS 700-N x DS 700- x DS 700- x DS 700- x DS x DS x DS x DS x DS x DS 700- x DS 700- x DS x DS 700-N x DS 700-N x DS 700- x DS 700- x DS 700- x DS x DS x DS x DS x DS x DS 700- x DS 700- x DS 700- x DS 700- x DS 700- x DS 700- x DS 700- x DS 700- x DS 700-4

11 D 700 page 5. Individual with connection sub-plate All ports of the /-, /-, /- and 4/-way directional seated s acc. to section are designed as holes with O-ring sealing at the ground bottom of the body. These s have to be completed with sub-plates or customer furnished manifolds to enable pipe connection. 5. Available versions, main data Order example: GR - - /S - G - 0 Valve coding acc. to sect. Desired pressure setting in bar (Pressure range depending on spring, see <) Coding Ports conforming DIN ISO 8/ ) (BSPP) Available for size /-way Flow pattern overview These symbols have to be completed with the actuation symbols. /-way /-way 4/-way 4/-way ; -/4 G /4 0 and Connection block without additional features -/8 ) -/ -/4 G /8 G / G /4 and and and 4 - G 4 Suited for connection in series and in parallel, if the perm. pressure stated in section.. "Operation pressure" for P, A, B and R are not exceeded. < -/4 S(R) G /4 0 and Connection with pressure limiting -/8 S(R) -/ S(R) G /8 G / and The connection block with pressure limiting is not available for /- and 4/-way directional s!../..s tool adjustable Not available for other sizes! Pressure range Coding Valve size Press. (bar../..sr manually adjustable -/4 S(R) -/8 S(R) -/ S(R) 0 and (0) (0) (0) (0) (0) (0) The pressure specification in the order coding determines the pressure range of the spring (size 0) and additionally the seat dimension for size and. Port R may be used only for unpressurized return flow to ensure proper function of the pressure reducing. Parallel connection of additional s is only permissible with sub-plates acc. to ; but not with sub-plates acc. to < = Connection block with bypass check -/4 C -/8 C -/ C G /4 G /8 G / 0 and and This connection block is only available for /-way directional s! p max (bar) and Q max (l/min) are determined by the installed. Not available for other sizes! -/4 C G /4 A by-pass check (RK acc. to D 7445) is required to enable flow R P. Pressure surges (decompression) in flow direction R P should be avoided! For pressure rating of R, see sect... > Connection block with rectifier circuit by means of check s -/4 G G /4 0 and -/8 G G /8 -/ G G / -/4 G G /4 4 Version with G is not available This connection block is only available for /-way directional s! p max (bar) and Q max (l/min) are determined by the installed. The rectifier circuit by means of check s enables both flow directions for the /-way s. Therefore the port codings P and R are not stamped on the sub-plate. ) For male pipe fittings with journals shape B DIN 85 page. ) Not available for flow pattern 4 and Z4 (table )

12 D 700 page 5. p - Q - curves Guideline for including sub-plate and a fluid viscosity of approx. 60 mm /s Flow direction P R sub-plates ;, < and = Flow direction P R (R P) sub-plates > /- and 4/-way Flow resistance p (bar) P A A R /--way P R Flow resistance p (bar) Flow Q (lpm) Flow Q (lpm) Valves 0 4 Flow direction R P sub-plates = Flow resistance p (bar) Flow Q (lpm) Valves 0 Example : A flow of 0 l/min is applied to type GR --/C (sub-plate = ) /p P R,... 4 bar acc. to table ; /p R P, bar acc. to table

13 D 700 page 5. Unit dimensions All dimensions are in mm and are subject to change without notice! 5.. Connection sub-plates acc. to ; and = /- and /-way s Attention: Port A is alsolete with /-way s, for all other dimensions see /-way. 0 and Type :..-/4(C) or..-/8(c) e.g. GZ --/4C-G 4 and Type :..-/8(C);..-/(C);..-/4(C) e.g. WG --/-G 4 4 Type :..-/4 or..- e.g. GS -4--G 4 M, 5 deep Port P, R a. A L B H a a a b c e f g h 0 G / M5, 6 deep.5 G / M6, 5 G / deep 5 G / M8, 5 G / deep 5 G / M0, 0 G / deep 0 /-way 4/-way 4/-way Type:..-0-/4 to e.g. WG --/8-WG 0 Type:..4--/4..Z4--/4 e.g. G 4--/4-G 4 Type:..-0-/4 to e.g. G --/4-G 4 L L B H H a a a a a4 a5 a6 b c c e e f g h M5, 6 deep M6, 0 deep M8, 0 deep M0, deep M, deep 8 h i i

14 D 700 page Connection sub-plates acc. to < 0 Type:..-/4 S(SR) Type:..-/4 S(SR);..-/8 S(SR) M6, 7 deep a/f 7 M6, 0 deep Manually adjustable (..SR) Manually adjustable (..SR) Tool adjustable (..S) Tool adjustable (..S) Type:..-/8 S(SR);..-/ S(SR) M8, 0 deep Manually adjustable (..SR) Tool adjustable (..S) Port P, R and A a a a b 0 G/ G / G / G / G / Connection sub-plates acc. to > Type:..-/4 G..-/8 G..-/ G..-/4 G L B H a b c e f g h M5, 4 5 deep M6, 0 deep M8, 4 0 deep ,5 M0, 8 0 deep M, 5 deep

15 D 700 page 5 6. Appendix 6. Protection of directional seated s against coarse contamination Directional seated s are rather unsensitive to ultra fine contamination always evident in hydraulic fluids. Nevertheless directional seated s are fitted with screen filter elements with 0.5 mm mesh width to prevent sudden disturbance caused by coarse contaminations that may occasionally be carried along in the oil (such as torn off particles of tubing, packing, scale swarf,) and which otherwise might get trapped at the seat gap. The sub-plates for individual s (sect. 5) are fitted with fine screen filter discs HFC /4F or HFC /8 (acc. to D 75) as standard at A and B with size 0, additionally in P with size. Valves size, and 4 with port size G /8, G / and G /4 may be retrofitted-. These screen filters are not available for G. These screen filter elements must not be understood as a replacement for usual hydraulic filters. In practice, however, they provide sufficient protection against malfunctions in small hydraulic systems. If such malfunctions should occur, the filter elements should be checked first. For the sake of simplicity, these filter elements are not explicitly shown in the diagrams. Screen filter elements type HFC acc. to D 75 Symbols Individual s acc. to section : Connection sub-plates acc. to section 5: /-way /-way /-way /-way /-way 4/- and 4/-way 6. Versions for special fluids ' HFA (water / glycol solution, conforming VDMA 47) The functionally essential parts are of stainless steel or tuffrided to prevent corrosion ( balls, seat, actuation pin etc.). The body (size ), external parts e.g. tapped plugs etc. are zinc galvanized. There are only /-, /- and 4/-way directional seated s available with flow pattern R, S,, a. Z, 4, Z4 (see table in sect..) Type coding: G --G 4 HFA Pressure p max (bar) Flow Q perm. (l/min) approx. with reflow back pressure bar bar Note: A slight compensating force in the return pipe may be created by installing the tank at the highest possible location within the system. Throttles (cascade type or a coiled, small diameter pipe) should be installed at the pressure inlet to limit the flow down to permissible values for the applied pressure. This is to prevent cavitation and applies to all s with return connection (/- und 4/-way s and /-way as by-pass to the tank) or s in circuits connected to an accumulator. ' Brake fluid based on glycol Versions equipped with EPDM (Ethylenpropylendien-rubber) seals suited for glycol based brake fluid or other special fluids. Type coding: GR --G 4 AT ' Versions equipped with FKM (flour rubber, Viton) seals suited for some HFD type fluids (fire inhibiting, conforming VDMA 47) Type coding: WGS -0-WG 0 PYD

16 D 700 page 6 7. Mass (weight) approx. in kg Basic complete with actuation acc. to section and 4 Actuation mode Type /- and /-way size /-way size 4/-way size 4/-way size Electrical G WG Hydraulic H ,8 Pneumatic P Mechanical Manual Act. roll K Act. pin T Lever F Turn knob D Connection sub-plates acc. to section 5 Connection block only, for weight of the directional seated s see above! 0 4 Simple connection block ; Connection block < with pressure limiting Connection block = with by-pass check Connection block > with rectifying circuit by means of check s Type overview G R - R - G 4 WG - -/S - WG 0-0 H - Solenoid voltage (standard) Additional information (option) e.g. special voltage, special fluids, pressure setting (sect. 4.; 5.; 6.) Additional elements (option), see sect.. R Check in port P B Orifice in port P S Return pressure stop in port R (size 0 and only) RS, BS Combination of check or orifice with return pressure stop (size 0 and only) 0,,,, 4 Connection sub-plates (option), see sect. 5 -/4, -/8, -/, -/4, - Simple connection block -/4S, -/8S, -/S Connection block with pressure limiting -/4SR, -/8SR, -/SR Connection block manually adjustable pressure limiting -/4C, -/8C, -/C, -/4C Connection block with by-pass check (/-directional s only) -/4G, -/8G, -/G, -/4G Connection block with rectifying circuit by means of check s (/-directional s only) Flow pattern R, S /-way s, Z /-way s /-way s 4/-way s (not for size 4) 4, Z4 4/-way s (size only ) Actuation G Solenoid, DC version WG Solenoid, AC version (50/60 Hz) H Hydraulic (not avail. size 4) P Pneumatic (not avail. for size 0 and 4) K Roll (not avail. for size 0 and 4) T Pin (not avail. for size 0, and 4) F Key levers (not avail. for size 0 and 4) D Turn knob (not avail. for size and 4)