Pilot Operated Spool Type Kick Down Relief Valve

Parker’s kick-down pilot operated spool type sequence valve provides fast responding and reliable performance for hydraulic circuits that require pressure to be eliminated once the max setting is achieved. These valves can work with pressures up to 420 bar (6000 psi) and flows up to 160 lpm (42 gpm) and can be considered a hydraulic fuse. Parker’s kick-down pilot operated spool type sequence valve is intended for clamping or press applications that don’t have strict leakage requirements within industrial markets, but can also be use in mobile applications such as when attachments or implements are used with hydraulic quick couplers and a fixed displacement pump.

Markets:
• Agriculture
• Aerial
• Construction
• Miscellaneous Industrial
• Miscellaneous Manufacturing
• Miscellaneous Mobile

Features/Benefits:
• High pressure and flow capacity
• Integrated 250 micron screen
• Hardened, precision ground parts for durability
• All external parts zinc plated

Applications:
• Clamping
• Power units
• Attachments/implements with quick disconnects

Additional Technical Insight:
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.