Pilot Operated Spool Type Kick Down Relief Valve A04K2PZN

Parker’s kick-down pilot operated spool type sequence valve is a hydraulic fuse used to unload flow once the pressure setting is reached, resetting when less than 45 psi. Capable of flows up to 160 lpm (42 gpm) and pressures up to 420 bar (6000 psi).

The pilot operated “kick down” relief valve is available in the -10 cavity configuration. This valve is best described as a pilot operated relief valve with a circuit breaker effect. The setting of the valve to open is adjustable, but reset pressure is always 45 psi. Once tripped open, the valve will remain open and flow through port 2 will continue until the pressure presented to port 1 is less than the bias pressure to hold the valve open, which is 45 psi/3 bar. Once the valve “trips” open, it provides a dynamic signal to the operator that a maximum pressure has been reached and the system dynamics need to be addressed.

One must also consider the leakage component as the spool is, by design, going to pass a small leakage flow, whereas a direct acting valve does not pass significant flow until the cracking pressure is reached.

Typical applications are in mobile equipment, such as agricultural machines, aerial equipment, refuse vehicles, industrial power unit systems, mining equipment, and other heavy duty fluid power pressure control circuits.

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