1 Fixed axial piston hydraulic motors with block of safety relieve valves BOPK.20 with block of brake valves WBV.20 Q=200 l/min for winches

2 Hydraulic motor design: - fixed displacement - bent axis axial piston - standard flange - cartridge type Parameters of safety relieve valves: - operating pressure bar - max pressure bar Parameters of brake valves: - operating pressure bar - max pressure- 400 bar - max flow l/min Parameters of pressure reduction valve: - reduced pressure – 17…70 bar Description Fixed axial piston hydraulic motor Block of safety relieve valves Block of brake valves Functions: - protection of pressure circuit against overload - smooth and fine load lowering - reliable locking aslope - brake control of planetary gearbox

3 Hydraulic circuit Design: M– hydraulic motor PV– relieve charge valves BV– brake valves OR– logic valve «OR» RV– pressure reducing valve А, В – working lines ports Т1, Т2– ports of hydraulic motor drain lines S – charge line port T3 – drain line port of brake valves block Gext – port of brake control line of planetary gearbox МА(В)– operating pressure control ports T1T1 S G ext T2T2 М А (В) A (B) B (A)

4 Load lifting During the load lifting operation the high pressure (red marked) flows through control valve into line«В» WBV. Part of the flow in line В through valve «OR» gets into control line of brake valves BV1 and BV2, to reducing valve RV. Reduced pressure opens the gearbox brake. Simultaneously the main flow passes through check valve of brake valve BV2 to operating line of hydraulic motor. Hydraulic motor equally rotates while lifting the cargo. Uniform rotation is provided with brake valve BV1.

5 Load holding After return of the main hydraulic control valve to neutral position in lines «А» and «В» the pressure straightens by decreasing to the minimum. As a consequence brake valves BV1 and BV2 close, the reducing valve decreases the pressure in line «Gext». The load stops with brake valve BV2 and is latched with gearbox brake.

6 Load lowering During the downward movement the high pressure (red marked) passes though control valve to line «А» WBV. The flow part in line А passes through valve «OR» to control line of brake valves BV1 and BV2, and to reducing valve RV. The reduced pressure opens gearbox brake. The main flow passes through check valve of brake valve BV1 to operating line of hydraulic motor. Hydraulic motor equally rotates while lowering the load. Uniform rotation is provided with brake valve BV2.

7 Bosch-RexrothPSM-Hydraulics

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