SAMPLE HYDRAULIC SYSTEM

Transcription

1 THE BASICS QUICK SELLING TIPS Familiarize yourself with the standard CROSS products and applications in the grey Full Line Catalog. ASK THE RIGHT QUESTIONS Find out as much about the system (psi, rpm, horsepower and torque requirements) as you can. SAMPLE HYDRAULIC SYSTEM MOTOR OR ENGINE POWER SOURCE PUMP PIPE, HOSE OR TUBING CONTROL VALVE CONTROLS PRESSURE, FLOW & DIRECTION CYLINDER OR FLUID MOTOR ACTUATOR CONVERSION OF ELECT. OR MECHANICAL ENERGY INTO FLUID POWER TRANSMISSION OF FLUID POWER TO THE POINT OF USE CONVERSION OF FLUID POWER ENERGY INTO MECHANICAL FORCE OR POWER (RESERVOIR SHOULD BE 1 1/2 TIMES THE PUMP GALLONAGE) VALVES accomplish three functions. They control: Direction Pressure Flow (SA) or AD* RD FD (S)BA* RC BC C series* RV Converta, (S)CD,(S)CA,CS (Also built into *) Selectors (S)VS & (S)SD Page 1

2 VALVES: THE BASICS Major Differences: SA/AD and BA C series load check for lifting no loadcheck - horizontal or motor applications differential style relief (quieter) ball & spring relief metering notches in spool for feathering less metering Both are 3 position valves Spool types: 4 way for double acting cylinders or reversible motor (Standard spool type is tandem - P to T and work ports blocked in neutral) 3 way for single acting cylinders or uni-directional motor float on BA series - a fourth position which allows oil to circulate (on a single acting system detent in is float) motoring oil circulates in neutral to allow motor to coast to a stop Power beyond and closed center options: Open center Constant flow in neutral No pressure in neutral Closed center (no relief in valve) No flow in neutral Constant (Stand-by) pressure in neutral Actuator options: Detents - manual hold - 3 position and spring centered, 2 position in or out Pressure kickout as on CD valve - not a field convertible option Selector systems - 2 positions - VS and SD Page 2

3 MOST COMMONLY ASKED VALVE QUESTIONS: HOW DO I HOOK UP THE VALVE? Inlet and outlet are marked on the valve as well as diagrammed on the box. A and B (C, D, E and F if applicable) ports go to the cylinder ports. WHAT VALVE SHOULD I USE FOR LIFTING? For safety, a valve with a load check is necessary in order that the load does not drop before it begins to raise again when you are shifting out of the neutral position. The load check is a spring loaded poppet which prevents the oil from backflowing until enough pressure is created to raise the load. WHAT VALVE DO I NEED FOR A LOADER? The most popular valve is the SBAF2 which has a float position on the first spool allowing the oil to circulate to permit the bucket to ride the contours of the ground. The second spool is for a two way cylinder and is spring centered to neutral. Another option is the SBA22 which is spring centered to neutral on both spools but features no float. I HAVE A JOHN DEERE. (or any other closed center system). CAN I USE A STANDARD VALVE? All SBA valves are convertible to closed center by installing a closed center plug(#1v0206) and no relief plug (#1R0035) as shown in literature shipped with the valve. Valves may also be ordered already converted to closed center - such as the SBA2-CC featuring a tighter spool fit. HOW DO I HOOK UP SEVERAL VALVES IN SERIES? Replace the conversion plug on the outlet side of the SBA valve with a power beyond sleeve (#1V0208). Connect this line to the inlet of the second valve. Run a tank line from the outlet of the first valve (has priority) back to the reservoir. HOW DO I CHANGE THE RELIEF OR BYPASS SETTING ON A VALVE? Use a pressure gauge in the inlet to assure precise results. An SBA valve may be adjusted by turning the adjustment screw under the acorn nut on the handle end of the valve. Clockwise will increase pressure. The Converta relief is shim adjustable. The spring in the Converta is rated to To increase the pressure to 2000 a different spring (#1A0685) is necessary. Do not exceed the recommended psi for the valve. WHAT DOES THE #1V0294 DETENT KIT DO? This manual detent fits the SBA or Converta. The valve handle (and spool) stays wherever it is placed until moved by the operator. CAN I PUT A FLOAT OPTION ON A STANDARD VALVE? No, the end of the spool as well as the lands are different so a standard valve will not accept a float detent. Spools are matched to the individual valve bodies so changing a valve spool in the field is not feasible. CAN I PUT A PRESSURE KICKOUT ON A STANDARD VALVE? Pressure kickout or automatic return to neutral requires a special internal machining which must be done at the factory when the valve is manufactured. ( It is a standard feature on the SCD2E - logsplitter valve.) CAN I USE A STANDARD VALVE FOR A SINGLE ACTING CYLINDER? No. A standard SBA valve has no place for the pump oil to go as you are exhausting or lowering the cylinder. Consequently, the oil goes over the relief and overheats the system. Valves with spools for single acting applications may be special ordered from the factory. The Converta is convertible to single acting. HOW DO I IDENTIFY A VALVE? The CROSS computer stock number is stamped on the handle end of the valve body on recent valve. On older valves the Z casting number is on the back. Page 3

4 OPEN AND CLOSED CENTER SYSTEMS OPEN CENTER This circuit consists of a positive displacement pump, a directional control valve and either a hydraulic cylinder or motor an actuator which converts the hydraulic energy back to mechanical energy to do some type of work. In this type of system, the pump pumps constantly even when the valve is in neutral. In this neutral position, oil is circulated freely through the center of the valve and back to the reservoir. No pressure is developed until the valve is actuated and fluid is directed to the actuator. Advantages: Lower pressure except when working so there is less component wear and shock load Simpler design Less maintenance CLOSED CENTER The components are similar to the open center system except that the pump maintains a constant head of pressure in neutral. The valve is closed in the center or neutral position so no oil can flow through it. This is accomplished by either making the center portion of the valve spool solid, or by inserting a special closed center plug which blocks the power core of the valve. The pump shuts down in the neutral position but constant pressure is maintained. The relief in the directional valve must be eliminated since this pump contains its own relief. Failure to do this may cause overheating in the system. Advantages: Pump works only upon demand Oil is on stand-by pressure for quick response.

5 CONVERSION TO CLOSED CENTER BA VALVE OPEN CENTER PASSAGE CONVERTS TO CLOSED CENTER RETURN PASSAGE #1V0206 CLOSED CENTER PLUG (cc stamped on plug) END OUTLET This option provides for conversion from open center to closed center by blocking the open center flow passage and may be used in any standard CROSS BA valve incorporating the conversion plug/power beyond machining in the BYD port. The valve may also be ordered already converted to closed center at the factory. These valves have less clearance between the spool and body to minimize leakage between the spool and valve body which may result in creeping of the cylinder. Valves built as closed center are marked with "CC" on the closed center plug. To convert an open center valve, remove the short conversion plug and replace it with the #1V0206 closed center plug as shown. The relief on the handle end of the valve must be replaced with #1R0035 no relief plug.* Failure to do this will result in chattering of the relief caused by the constant bypass of oil and will build excessive heat in the system. An outlet must be plumbed to the tank to dump the oil from the return passage. Any restriction in the tank line of a closed center system caused by faulty quick couplers, a collapsed hose, etc. will damage the spool seals, washers and handle bracket resulting in external leakage around the spool. Reversing the tractor valve so that the outlet rather than the inlet is pressurized would have the same effect. These possible problems must be remedied in the system. In a closed center system the neutral pressure of a least 2250 psi sometimes causes leakage between the pressure core and the work ports enabling the cylinders to drift or creep. Reworking the valve at the factory to a class 1A spool fit will minimize this problem. Valves with class 1A spool fit may be special ordered from the factory and are marked "1A" on the handle end of the valve body as well as on the box. *(Kit #1V2015 contains both the #1V0206 closed center plug and the #1R0035 no relief plug.) Valves manufactured as closed center do not contain a relief and should never be installed in an open center system or converted to open center due to the possibility of personal injury or system damage!

6 Load check SA2 SINGLE SPOOL DIRECTIONAL VALVE (AD11AG3000 #160040) 15 GPM, 3000 PSI Built in adjustable relief, preset at 2000 PSI Open center (tandem) in neutral Forward, reverse and neutral positions 7/8-14 (SAE #10) inlet and outlet, 3/4-16 (SAE #8) work ports Built in load check for lifting Good spool metering for handle feathering action Conversion plug Conversion plug option allows conversion for closed center systems (see below) or for use in a power beyond application (use #1V2566 power beyond sleeve) The CROSS SA2 is a 3 position, 4 way, open center directional valve designed for use on an open center system. It is easily convertible for use in a closed center system, however, by replacing the relief with a 1R0035 no relief plug and the conversion plug with a 1V2572 closed center plug. (SEE CONVERSION TO CLOSED CENTER.) The built in load check in this valve is a spring loaded poppet which prevents the load from dropping before it starts to raise again, when the operator is shifting out of the neutral position. This valve is spring centered to neutral but manual, spring centered detent kits are available for field conversion. Applications: 1. Will operate a double acting cylinders in a lifting or horizontal application. 2. Will operate a reversible motors when a hold position in neutral is required. Page 5

7 Load check SA22 DOUBLE SPOOL DIRECTIONAL VALVE (AD211AAG3000 #160523) 15 GPM, 3000 PSI Built in adjustable relief, preset at 2000 PSI Open center (tandem) in neutral Forward, reverse and neutral positions 7/8-14 (SAE #10) inlet and outlet, 3/4-16 (SAE #8) work ports Built in load check for lifting Good spool metering for handle feathering action Conversion plug Conversion plug option allows conversion for closed center systems (see below) or for use in a power beyond application (use #1V2566 power beyond sleeve) The CROSS SA22 is a 3 position, 4 way, open center directional valve designed for use on an open center system. It is easily convertible for use in a closed center system, however, by replacing the relief with a 1R0035 no relief plug and the conversion plug with a 1V2572 closed center plug. The built in load check in this valve is a spring loaded poppet which prevents the load from dropping before it starts to raise again, when the operator is shifting out of the neutral position. This valve will operate two functions either independently or simultaneously. The flow path of the valve is a parallel circuit meaning that if both handles are pulled simultaneously the oil will take the path of least resistance. (For example, in a lifting application, the lightest load would lift first.) This valve is spring centered to neutral but several detent kits are available for field conversion. Applications: 1. Will operate 2 double acting cylinders in a lifting or horizontal application. (Example: farm loader when a float position is not required.) 2. Will operate two reversible motors when a hold position in neutral is required. 3. Will operate one cylinder and one reversible motor as described above. Page 6

8 SAF2 DOUBLE SPOOL DIRECTIONAL VALVE (AD2A1XAG3000 #160698) Load check 15 GPM, 3000 PSI Built in adjustable relief, preset at 2000 PSI Open center (tandem) in neutral Forward, reverse and neutral positions 7/8-14 (SAE #10) inlet and outlet, 3/4-16 (SAE #8) work ports Built in load check for lifting Good spool metering for handle feathering action Conversion plug Conversion plug option allows conversion for closed center systems (see below) or for use in a power beyond application (use #1V2566 power beyond sleeve) The CROSS SAF2 is a 4 position, 4 way (first spool), 3 position, 4 way (second spool) open center directional valve designed for use on an open center system. This valve is spring centered to neutral with a detent (hold position) for the float position on the first spool. The valve is ideally suited to a loader application since the float position on the first spool allows the oil to circulate permitting the blade to ride the contours of the ground as the machine moves forward. It is easily convertible for use in a closed center system, however, by replacing the relief with a 1R0035 no relief plug and the conversion plug with a 1V2572 closed center plug. The built in load check in this valve is a spring loaded poppet which prevents the load from dropping before it starts to raise again, when the operator is shifting out of the neutral position. This valve will operate two functions either independently or simultaneously. The flow path of the valve is a parallel circuit meaning that if both handles are pulled simultaneously the oil will take the path of least resistance. (For example, in a lifting application, the lightest load would lift first.) Applications: 1. Will operate 2 double acting cylinders in a lifting or horizontal application. (Example: farm loader or snowplow with double acting cylinders.) Page 7.

9 30 GPM, 2500 PSI Built in adjustable relief, preset at 2000 PSI Open center (tandem) in neutral Forward, reverse and neutral positions 3/4" NPTF inlet and outlet, 1/2" NPTF work ports Built in load check for lifting Good spool metering for handle feathering action Load check SBA12-SP (BA231NAG3EA0) # DOUBLE LEVER DIRECTIONAL VALVE Conversion plug Conversion plug option allows conversion for closed center systems (Kit #1V2015) or for use in a power beyond application (use #1V0208 sleeve) The CROSS SBA12-SP is a 3 position, 3 way with float detent "in" on the first spool and 3 position, 4 way open center on the second spool, directional valve designed for use on an open center system. It is easily convertible for use in a closed center system, however, by changing two plugs. (CONVERSION TO CLOSED CENTER). The built in load check in this valve is a spring loaded poppet which prevents the load from dropping before it starts to raise again, when the operator is shifting out of the neutral position. This valve will operate two functions either independently or simultaneously. The flow path of the valve is a parallel circuit meaning that if both handles are pulled simultaneously the oil will take the path of least resistance. (For example, in a lifting application, the lightest load would lift first.) The first spool is spring centered to neutral with a float detent position on the in, and the second spool is spring centered to neutral. To Tractor Hydraulics From Tractor Hydraulics Applications: 1. Will operate one single acting cylinders and one double acting cylinder in a lifting or horizontal application. Typical applications - Loaders or snow plows with one single acting cylinder Page 8

10 Load check SBA1 SINGLE LEVER DIRECTIONAL VALVE (BA13AG3EA0 #133259) Not in Full Line Catalog but usually in stock Conversion plug 30 GPM, 2500 PSI Built in adjustable relief, preset at 2000 PSI Open center (tandem) in neutral Forward, reverse and neutral positions 3/4" NPTF inlet and outlet, 1/2" NPTF work port Built in load check for lifting Good spool metering for handle feathering action Conversion plug option allows conversion for closed center systems (Kit # 1V2015) or for use in a power beyond application (use #1V0208 sleeve) The CROSS SBA1 is a 3 position, 3 way, open center single spool directional valve designed for use on an open center system. It is easily convertible for use in a closed center system, however, by changing two plugs. (See CONVERSION TO CLOSED CENTER.) The built-in load check in this valve is a spring loaded poppet which prevents the load from dropping before it starts to raise again, when the operator is shifting out of the neutral position. This valve is spring centered to neutral but several detent kits are available for field conversion. Applications: 1. Will operate a single acting cylinder in a lifting application.. 2. Will operate a unidirectional motor when a hold position in neutral is required.

11 Load check SBA2 SINGLE LEVER DIRECTIONAL VALVE (BA11AG3EA0 #131135) Conversion plug 30 GPM, 2500 PSI Built in adjustable relief, preset at 2000 PSI NOTE: CLOSED CENTER VERSION IS Open center (tandem) in neutral SBA2-CC # BA12AD5EA0 Forward, reverse and neutral positions 3/4" NPTF inlet and outlet, 1/2" NPTF work ports Built in load check for lifting Good spool metering for handle feathering action Conversion plug option allows conversion for closed center systems (Kit # 1V2015) or for use in a power beyond application (use #1V0208 sleeve) The CROSS SBA2 is a 3 position, 4 way, open center single spool directional valve designed for use on an open center system. It is easily convertible for use in a closed center system, however, by changing two plugs. (See CONVERSION TO CLOSED CENTER.) The built-in load check in this valve is a spring loaded poppet which prevents the load from dropping before it starts to raise again, when the operator is shifting out of the neutral position. This valve is spring centered to neutral but several detent kits are available for field conversion. Applications: 1. Will operate a double acting cylinder in a lifting or horizontal application. 2. Will operate a reversible motor when a hold position in neutral is required. Page 9

12 SBA22 DOUBLE LEVER DIRECTIONAL VALVE (BA211AAG3EA0 #136250) Load check 30 GPM, 2500 PSI Built in adjustable relief, preset at 2000 PSI Open center (tandem) in neutral Forward, reverse and neutral positions 3/4" NPTF inlet and outlet, 1/2" NPTF work ports Built in load check for lifting Good spool metering for handle feathering action Conversion plug NOTE: CLOSED CENTER VERSION IS SBA22-CC # BA222AAD5EA0 Conversion plug option allows conversion for closed center systems (Kit #1V2015) or for use in a power beyond application (use #1V0208 sleeve) The CROSS SBA22 is a 3 position, 4 way, open center directional valve designed for use on an open center system. It is easily convertible for use in a closed center system, however, by changing two plugs. (CONVERSION TO CLOSED CENTER). The built in load check in this valve is a spring loaded poppet which prevents the load from dropping before it starts to raise again, when the operator is shifting out of the neutral position. This valve will operate two functions either independently or simultaneously. The flow path of the valve is a parallel circuit meaning that if both handles are pulled simultaneously the oil will take the path of least resistance. (For example, in a lifting application, the lightest load would lift first.) This valve is spring centered to neutral but several detent kits are available for field conversion. Applications: 1. Will operate 2 double acting cylinders in a lifting or horizontal application. (Example: farm loader when a float position is not required.) 2. Will operate two reversible motors when a hold position in neutral is required. 3. Will operate one cylinder and one reversible motor as described above. Page 10

13 Load check SBA222 TRIPLE LEVER DIRECTIONAL VALVE (BA3111AAAG3EA0 #145737) NOTE: CLOSED CENTER VERSION IS SBA222-CC # BA3222AAAD5EA0 30 GPM, 2500 PSI Built in adjustable relief, preset at 2000 PSI Open center (tandem) in neutral Forward, reverse and neutral positions 3/4" NPTF inlet and outlet, 1/2" NPTF work ports Built in load check for lifting Good spool metering for handle feathering action Conversion plug Conversion plug option allows conversion for closed center systems (Kit #1V2015) or for use in a power beyond application (use #1V0208 sleeve) The CROSS SBA222 is a 3 position, 4 way, open center directional valve designed for use on an open center system. It is easily convertible for use in a closed center system, however, by changing two plugs. (See CONVERSION TO CLOSED CENTER). The built in load check in this valve is a spring loaded poppet which prevents the load from dropping before it starts to raise again, when the operator is shifting out of the neutral position. This valve will operate two functions either independently or simultaneously. The flow path of the valve is a parallel circuit meaning that if two or more handles are pulled simultaneously the oil will take the path of least resistance. (For example, in a lifting application, the lightest load would lift first.) This valve is spring centered to neutral but several detent kits are available for field conversion. Applications: 1. Will operate 3 double acting cylinders in a lifting or horizontal application. (Example: farm loader when a float position is not required plus an additional function) 2. Will operate three reversible motors when a hold position in neutral is required. 3. Will operate two cylinders and one reversible motor as described above. 3. Will operate one cylinders and two reversible motors as described above. Page 11

14 SBAF2 DOUBLE LEVER DIRECTIONAL VALVE (BA2AIXAG3EA0 #143799) Load check NOTE: CLOSED CENTER VERSION IS SBAF2-CC # BA2B2XAD5EA0 Conversion 30 GPM, 2500 PSI plug Built in adjustable relief, preset at 2000 PSI Open center (tandem) in neutral Forward, reverse and neutral positions with an additional float position on first spool only 3/4" NPTF inlet and outlet, 1/2" NPTF work ports Built in load check for lifting Good spool metering for handle feathering action Conversion plug option allows conversion for closed center systems (use Kit #1V2015) or for use in a power beyond application (use #1V0208 sleeve) The CROSS SBAF2 is a 4 position, 4 way (first spool), 3 position, 4 way (second spool), open center directional valve designed for use on an open center system. This valve is spring centered to neutral with a detent (hold position) for the float position on the first spool. The valve is ideally suited to a loader application since the float position on the first spool allows the oil to circulate permitting the blade to ride the contours of the ground as the machine moves forward. The SBAF2 is easily convertible for use in a closed center system, however, by changing two plugs. (See CONVERSION TO CLOSED CENTER). The built in load check in this valve is a spring loaded poppet which prevents the load from dropping before it starts to raise again, when the operator is shifting out of the neutral position. This valve will operate two functions either independently or simultaneously. The flow path of the valve is a parallel circuit meaning that if both handles are pulled simultaneously the oil will take the path of least resistance. (For example, in a lifting application, the lightest load would lift first.). Applications: 1. Will operate 2 double acting cylinders in a lifting or horizontal application. (Example: farm loader or snow plow with double acting cylinders.) Page 12

15 Load check SBAF22 TRIPLE LEVER DIRECTIONAL VALVE (BA3A11XAAAG3EA0 #150340) NOTE: CLOSED CENTER VERSION IS SBAF22-CC # BA3B22XAAD5EA0 30 GPM, 2500 PSI Built in adjustable relief, preset at 2000 PSI Open center (tandem) in neutral Forward, reverse and neutral positions with an additional float position on first spool only 3/4" NPTF inlet and outlet, 1/2" NPTF work ports Built in load check for lifting Good spool metering for handle feathering action Conversion plug Conversion plug option allows conversion for closed center systems (Kit #1V2015) or for use in a power beyond application (use #1V0208 power beyond sleeve) The CROSS SBAF22 is a 3 position, 4 way, open center directional valve designed for use on an open center system. The valve is ideally suited to a loader application since the float position on the first spool allows the oil to circulate permitting the blade to ride the contours of the ground as the machine moves forward. The SBAF22 is easily convertible for use in a closed center system, however, by changing two plugs. (See CONVERSION TO CLOSED CENTER..) The built in load check in this valve is a spring loaded poppet which prevents the load from dropping before it starts to raise again, when the operator is shifting out of the neutral position. This valve will operate two functions either independently or simultaneously. The flow path of the valve is a parallel circuit meaning that if both handles are pulled simultaneously the oil will take the path of least resistance. (For example, in a lifting application, the lightest load would lift first.) This valve is spring centered to neutral with a detent (hold position) for the float position on the first spool. Applications: 1. Will operate 2 double acting cylinders in a lifting or horizontal application (Example: farm loader or snow plow with double acting cylinders.) The third spool will operate an additional double acting cylinder or a motor when a hold position in neutral is desired. Page 13

16 SBC2S (BC1AG3E2A0 #120820) APPLICATION DRAWING SECONDARY MAY BE USED TO RUN ANOTHER SYSTEM * IF PLUGGING SEC- ONDARY PORT THIS INTERNAL PLUG MUST BE REMOVED FIRST. FROM PUMP OR TRACTOR SYSTEM TO TANK STANDARD SBC2S IS SHIPPED FROM THE FACTORY WITH A SHIPPING PLUG IN THE SECONDARY PORT. SECONDARY PORT IS READY FOR USE. (Not Convertible to Closed Center) * Secondary flow is pump flow that is 'leftover' or not selected to go out ports A & B. If external secondary is not desired, oil may be routed internally to the tank cavity by removing internal plug as shown. Standard #1 - tandem spool #5 - motoring spool (special order) Page 14

17 CONVERTA SCV-1 (#103980) Valve 4-WAY CONVERSION PLUG Rated to 2000 psi 25 gpm flow rating Open center (tandem) in neutral Forward, reverse and neutral positions 3/4" NPTF inlet and outlet, 1/2" NPTF work ports Built in relief valve preset at 2000 psi at 10 gpm Convertible for use as single acting or double acting 3-WAY CONVERSION PLUG The CROSS CONVERTA is a 3 position, 4 way, open center, spring centered directional valve. It is designed for use on a open center system where the pump supplies fluid constantly. In the neutral position the inlet is open to the outlet and the work ports are blocked (tandem center). A unique feature of this valve is that it is easily convertible from the basic double acting valve (as shipped from the factory) to a single acting valve by replacing the small 4-way conversion plug on the outlet side of the valve with the shorter 3-way conversion plug (also included with the valve). A manual detent (Part # 1V0294) is also available for this valve. This kit replaces the spring centering on the valve so that the valve handle stays wherever the operator places it until he/she repositions it. Applications: 1. Will operate a double or single acting cylinder. (This valve does not incorporate a load check so it is not intended for metered lifting applications or heavy loads.) 2. Will operate a reversible or one direction motor if a hold position in neutral is required. Page 15

18 SCA2 VALVE (CA11ABA0 #10040) Rated to 2000 psi 30 gpm flow rating Open center (tandem) in neutral Forward, reverse and neutral positions 3/4" NPTF inlet and outlet, 1/2" NPTF work ports Built in relief valve preset at 1500 psi at 10 gpm The CROSS SCA2 is a 3 position, 4 way, open center, spring centered directional valve. It is designed for use on a open center system where the pump supplies fluid constantly. In the neutral position the inlet is open to the outlet and the work ports are blocked (tandem center). It is not field convertible to closed center since a special spool is required and the spool is individually matched to the valve body. The valve spool has no metering notches so is not designed for applications where feathering action is desired. A manual detent (Part # 1V0294) is available for this valve. This kit replaces the spring centering on the valve so that the valve handle stays wherever the operator places it until he/ she repositions it. Applications: 1. Will operate a double acting cylinder. (Does not incorporate a load check so is not intended for metered lifting applications or heavy loads.) 2. Will operate a reversible motor if a hold position in neutral is required. Page 16

19 SCD2E (CD11FCA0 #108360) Logsplitter Valve Rated to 2000 psi 30 gpm flow rating Open center (tandem) in neutral Manual extension with spring centering back to neutral Pressure kickout (set at 1000 psi) on the retract Forward, reverse and neutral positions 3/4" NPTF inlet and outlet, 1/2" NPTF work ports Built in relief valve preset at 2000 psi at 10 gpm NOTE: CLOSED CENTER VERSION IS # CD12FDA0 The CROSS SCD2E is a 3 position, 4 way, open center directional valve. It has a manual extend with spring centering to neutral as well as a pressure kickout on the retract. For safety, it is recommended that the operator always hold the handle as the cylinder is extending. The pressure kickout in the reverse means that the valve can be placed in detent (a hold position) for the cylinder to retract. When it is completely retracted, the pressure kickout will return the valve to its neutral position. It may then be reactivated for another cycle. This valve is designed for use on a open center system where the pump supplies fluid constantly. In the neutral position the inlet is open to the outlet and the work ports are blocked (tandem center). Applications: 1. Will operate a double acting cylinder. (Does not incorporate a load check so is not intended for metered lifting applications or heavy loads.) 2. Specifically designed for logsplitter, press or similar applications. Page 17

20 Manual 3-way, 2 Position Selector Valve SVS2 Single Selector Valve (VS2BKLF2 #128140) 20 GPM, 2500 PSI Knob actuator Hard chrome plated spool 1/2 " NPTF ports Clevis also available (Part # 1V0930) OPERATION: In a standard selector circuit, oil enters the valve through Port C and exits through a work port. Shifting the selector spool by pushing or pulling the knob will divert the flow of oil to the other work port A to B or vice versa..(see Figures 1 & 2) When used as an input selector, oil would enter the valve through Port A or B and exit through port C depending on the position of the spool. ( See Figure 3) APPLICATIONS: Page 18

21 Manual 3-way, 2 Position Selector Valve Single Selector Valve SVS4 (#VS4BKLF ) 40 GPM, 3000 PSI Knob actuator Hard chrome plated spool 3/4 " NPTF ports OPERATION: In a standard selector circuit, oil enters the valve through Port C and exits through a work port. Shifting the selector spool by pushing or pulling the knob will divert the flow of oil to the other work port A to B or vice versa..(see Figures 1 & 2) When used as an input selector, oil would enter the valve through Port A or B and exit through port C depending on the position of the spool. (See Figure 3) APPLICATIONS: OPTIONAL FIELD CONVERSION KITS Description Part # Knob 1A0768 Clevis Adaptor 1V0930 Spring return assembly 1V0932 Two-position detent 1V0934 Page 19

22 Manual 6-way, 2 Position Double Selector Valve Double Selector Valve SSD4 (SD4BALA6 #129027) 40 GPM, 2500 PSI Complete handle assembly Hard chrome plated spool 1" NPTF ports TYPICAL APPLICATIONS: This valve provides an economical method of diverting flow to two separate hydraulic circuits (cylinders or motors) using the same directional control valve. OPTIONAL FIELD CONVERSION KITS Description Part # Knob 1A0768 Clevis Adaptor 1V0930 Spring return assembly 1V0932 Two-position detent 1V0934 Page 20

23 SEQUENCE VALVE SQV SERIES (#128513) The CROSS sequence or SQV valve is designed to alternately operate a pair of agricultural guide marker cylinders on a row marker system. 2 position, 3 port (3/4-16 SAE) Rated to 2500 psi, 2 gpm Rugged construction 100% testing OPERATION: System diagram and valve layout represent the main cylinder "C" in retracted position (implement down), with marker cylinder "A" extended (marker up). Marker cylinder "B" is retracted (marker down). At the end of a row, cylinder "C" is extended to lift the implement pressurizing ports "A" and "B" through the sequence valve spool. Marker cylinder "B" would then extend (marker up). No flow would pass through "A" port since cylinder "A" is already extended. This condition causes a pressure drop between the "A" & "B" port ends of the sequence valve which shifts the spool to the "B" port end. Starting a new row, main cylinder "C" is retracted (implement down) pressurizing marker cylinders "A" and "B" to retract. However, port "B" flow passages are blocked by the spool and integral check in "B" port. Consequently, only marker cylinder "A" is allowed to retract (marker down). Upon completion of this row, main cylinder "C" is again extended, and the marker cylinder "A' is raised. The pressure differential on the spool shifts the spool to the port "A' end preparing marker cylinder "B" to be lowered. Once the implement and "B" port marker are lowered. the guide marker system will have completed its full cycle and be back in its original position. Page 21

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25 Pump & Motor Sizing Tools for selling: Full Line Catalog - Chart on page 2 Specification Sheets ( blue bordered - contained in white CROSS master binder) Parts Sheets Technical Sheets - packed in boxes with units (presents similar information) MOTOR OR ENGINE POWER SOURCE PUMP PIPE, HOSE OR TUBING CONTROL VALVE CONTROLS PRESSURE, FLOW & DIRECTION CYLINDER OR FLUID MOTOR ACTUATOR CONVERSION OF ELECT. OR MECHANICAL ENERGY INTO FLUID POWER TRANSMISSION OF FLUID POWER TO THE POINT OF USE CONVERSION OF FLUID POWER ENERGY INTO MECHANICAL FORCE OR POWER Sample Hydraulic System Pump flow determines how fast system will run Motor (Size) determines amount of torque or rotary force. (How much work can be done.) What Is A Pump? Pumps fluid - Is externally driven Converts mechanical energy to fluid energy What Is A Motor? Fluid drives the gears and shaft of the pump Converts fluid energy back to mechanical energy How Does It Work? Cross pump is external gear type, consisting of 2 gears in mesh inside a closely fitted housing. Drive shaft and gear are driven by outside power source (motor or engine). This drive gear drives the driven gear. As gears rotate, oil is trapped & forced out into system. Small amount of oil is fed under pressure loading seals to press thrust plates against gears to increase efficiency. Motor is reverse - oil drives the gear. Physical Specifications - Materials & dimensions are given on specification sheets. Rotation is viewed from shaft end with belly down. Rotation marked with arrows on the flange of the pump - must be rotated correctly or shaft seal will be blown. Page 21

26 Single rotation pump has vent hole in inlet port for low pressure lubication oil to the gears Front Cover of Dual Rotation units contain check valves Case drain in rear cover needs to be hooked up back to tank when unit is run as a motor and back pressure exceeds 250 psi - good idea to hook up whenever possible as a safeguard. Units Have Straight Thread (ORB) Ports - Not Pipe CROSS has 19 different displacement or sizes. Pumps can supply up to 90 gpm & may be belt, pulley or direct driven. Side load should be kept to a minimum as these units contain a teflon lubricated sleeve type bearing only. See specification sheets or full line catalog chart for sizes and displacements offered. How To Size A Pump Ask customer how much flow is needed and what rpm pump will be running. If customer wants to approximate a tractor system usually requirement will be between 12 & 15 GPM. Use Nomographs (Full Line p.12) to figure required pump output if you need to move a cylinder at a specified speed. Pump flow will be determined by size of pump and the rpm it is running so you will need to know what rpm the power source is turning. Examples: 1725 Electric Motor 2600 Gas Engine 2250 Crankshaft After you know rpm, go to chart (grey full line p.2, pump tech sheets or performance charts) and find appropriate pump (model # and actual displacement) to provide the desired flow. Within a series the width of gears and body of the pump determine the cu. in. displ. per revolution or how much fluid may be pumped. Simple formula for gpm is [(Displ. * rpm)/231] * Efficiency (90%) Example : 50P023 At 2200 rpm (2.32 *2200)/231 = 19.9 gpm If horsepower requirement is a limiting factor it usually takes about 1 hydraulic horsepower for every gallon of flow at 1500 psi. Horsepower requirements are based on flow and pressure. Formula - [(Gpm * Psi)/1714 ]* (1/Efficiency) so 20 gpm at 2000 psi would be as follows: (40000/1714) * 1. 1 = 25.7 Hydraulic Horsepower Page 22

27 Rules Of Thumb For Converting - 1 Electric Motor H.P.=1.5 Hydraulic Motor H.P. 1 Gas Engine H.P. =.67 Hydraulic Motor H.P. 1 Hydraulic Motor H.P.= 1.67 Gas Horsepower 1 Hydraulic Motor H.P. =.67 Electric Motor H.P. 1 Electric Motor H.P. = 2.5 Gas Engine H.P. See Performance Charts - Page 3 Of Specification Sheets Other pump specifications are mostly physical: Direction of rotation Type of shaft Mounting flange dimensions Side or rear port options Build A Model Number As Shown On Page 2 Of The Specification Sheet with Blue Border Limitations: 600 RPM MINIMUM - pumps and motors are not efficient below this speed Maximum RPM is determined by inlet size. as shown on p. 4 of specification sheets. There is danger of cavitation (or pump sucking air) if unit is run above recommended speed. See Full Line Catalog Chart - Shaded area indicated that larger inlet required Advantages of CROSS Pumps : Thrust plates on both sides of the gear for better efficiency In either thrust or pull applications Larger journals than some competitors Versatility, compact, economical, light weight & long service life. How To Size A Motor Need to know how much torque (rotary force is required) or what horsepower is needed at what rpm. Torque is determined by size of the motor and system psi. Definitions- Torque - Rotary Force Or How Much Work Can Be Done Horsepower - Also Considers How Fast The Work Can Be Done Formulas Input gpm - same as for pump formula except efficiency. [(Displ. * Rpm)/231] * [1 /Efficiency(.80)] Example - 50M015 Requires? Gpm To Run 1500 Rpm [(1.52 *1500)/231] * 1.25 = 12.3 Gpm Torque in In.Lbs. = [(Psi * Displ.)/6.28 ]* Efficiency (.8) Example - 50M015 At 2000 Psi [(2000 * 1.52)/6.28] *.8 = 387 In. Lbs. Of Torque Horsepower Output = [(Torque * Rpm)/63025] * Efficiency Example - 50M015 At 2000 Psi & 1500 Rpm [(387 *1500)/63025] X.8 = 7.4 Horsepower Out See Performance Charts Note: Don t try to engineer the system - find out torque or horsepower requirement (& rpm) from the customer - often customer will need to go back to manufacturer of the equipment or look at a similar system in operation. Page 23

28 Motor Specs: Rated To 3000 psi 600 minimum rpm 3600 maximum rpm on 40 Series 3000 maximum otherwise Cavitation is not a problem on motors because the oil is pressurized. Field Identification: Direction of rotation is marked on unit. Stock number is a 6 digit starting with 3... (date code and partial description noted as below) stamped on the flange. Measure width of body or gears if unable to read computer stock number. MODEL GEAR WIDTH BODY WIDTH 40P P P P P P P P P P P P P P P P P P P Summary TO SIZE A PUMP - KNOW FLOW REQUIREMENT AND RPM OF POWER SOURCE TO SIZE A MOTOR - KNOW TORQUE REQUIREMENT OR HORSEPOWER AS WELL AS OUTPUT RPM REQUIRED DIFFERENCE BETWEEN A PUMP AND A MOTOR ROTATION VIEWED FROM SHAFT END - DUAL ROTATION UNITS ARE IDENTICAL STRAIGHT THREAD PORTS ONLY RATED TO 3000 PSI 600 RPM MINIMUM - MAXIMUM RPM DETERMINED BE INLET SIZE USE LARGE ENOUGH INLET LINE TO PREVENT CAVITATION HOOK UP DRAIN LINE ON MOTOR IF BACK PRESSURE EXCEEDS 250 PSI TO IDENTIFY FOR FIELD REPLACEMENT - SEE COMPUTER NUMBER STAMPED ON THE FLANGE OR MEASURE WIDTH OF GEAR OR BODY TO FIND DISPLACEMENT Efficiency: Pumps - 90% Overall Motors - 50 & 60 Series - 80% Overall, 40 Series - 80% overall except.5 &.75 are less Page 24