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REXROTH R900587557 SV20PA1-4X/M Check Valve
REXROTH R900587557 SV20PA1-4X/M is a subplate-mounted pilot-operated check valve with an unloading function, commonly known as a "hydraulic lock" or "pressure-holding valve."
REXROTH R900587557 SV20PA1-4X/M Basic Function: Its core function is to allow hydraulic oil to flow freely in one direction while completely blocking reverse flow, providing excellent sealing performance. This ensures that the actuator can remain stably in a specific position for extended periods without displacement due to external forces or internal system leakage.
Pilot-Operated Unloading: Unlike standard check valves, it features an additional pilot port (X port). When reverse movement of the actuator is required, applying a pilot pressure to this port "pushes open" the check valve core, allowing reverse oil flow and enabling unlocking.
Thanks to its reliable control and pressure-holding capabilities, the R900587557 SV20PA1-4X/M pilot-operated check valve is widely used in the following fields:
Construction Machinery: Boom cylinders and outrigger cylinders in excavators, cranes, and loaders to prevent movement due to gravity during operation.
Metallurgical Equipment: Clamping and positioning devices in continuous casters and rolling mills, ensuring position maintenance under high pressure for extended periods.
Injection Molding Machines: Clamping mechanisms to prevent mold opening during injection and pressure-holding phases.
Marine Applications: Deck machinery, steering gears, etc., for stabilizing positions in rough seas.
Hydraulic Presses: Pressure-holding in main cylinders to ensure stable processing pressure.
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