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| Illustration 1 | g00471172 |
(1) Pressure and flow compensator valve (2) Passage from the implement control valves for the load sensing signal (3) Flow compensator spool (4) Pressure compensator spool (5) Pump output pressure (6) Signal passage to actuator piston (7) Case drain passage (8) Orifice (AA) Supply oil (BB) Reduced supply oil (DD) Pilot signal oil (LL) Sump oil | |
The pressure and flow compensator valve (1) is bolted to the top of the implement hydraulic pump. The pressure and flow compensator valve (1) contains two spools. The flow compensator spool (3) controls the margin pressure. The flow compensator spool (3) regulates the pump output flow in response to the load sensing signal (2). The load sensing signal (2) is received through the pump signal control network.
The flow that is supplied by the implement hydraulic pump is the amount that is required in order to keep the supply pressure 1830 ± 100 kPa (265 ± 15 psi) above the signal pressure. The difference between supply pressure and signal pressure is called the margin pressure.
The pressure compensator spool (4) limits the maximum system pressure to 18950 ± 345 kPa (2750 ± 50 psi). Also, the pressure compensator spool serves as the relief valve for the implement hydraulic system.
The pressure and flow compensator valve (1) has an orifice (8) in the signal passage to the actuator piston (6). The orifice (8) is used in order to regulate the response rate of the actuator piston by creating a consistent leak path.
Note: The orifice (8) must be installed with the slot for the screwdriver parallel to the spool bores.