Single Pilot Operated, Pilot to Open Check Valves D4A040V

Parker’s P.O. check valve assemblies allow flow up to 150 lpm (40 gpm) with pressures up to 420 bar (6,000 psi). Return flow can be enable by an external pilot supply, which shifts the internal poppet into an open position.

Pilot operated check valves, also known as PO checks, are used to lock a cylinder in a holding position with minimal leakage or drift. PO check valves that can be opened to allow flow in the reverse direction with an external signal to the pilot port. The valves work best when used in conjunction with a control valve that vents the valve ports to tank when centered. Pilot pressure to open the checks for reverse flow is a ration of the holding pressure. Typical ratios are 3:1 or 4:1. A 3:1 ratio with a 3000psi load requires a 1000psi signal to the pilot port. Typical applications are cylinder holding in any type of mobile or industrial machinery. Pilot to close checks are a normally open version of PO checks, whereby a pilot signal is required to close, not open, the check valve. Typical applications are for cylinders when requiring a re-generation function.

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