Eaton Check Valves D*8P1-02/03/06/10, DF10P1-20, C2-800


Inline, right angle, manifold mounted, and pilot operated designs.

Vickers inline, right-angle, and manifold mounted check valves are direct operated and used in hydraulic circuits to allow the free flow of fluid in one direction only. The graphical symbol for these valves is a spring-loaded ball and a seat A light spring holds the valve poppet in its normally closed position. The valve starts to pass fluid at a pressure equivalent to the spring cracking pressure level. Various spring (cracking) pressures are available to suit application requirements.

All except inline models can be used for high velocity flows resulting in shock conditions. Inline models are designed for low shock service. Inline check valves can be used as a safety bypass for flow surges through filters and heat exchangers.

With a higher spring rating, they can also be used as a means of generating pilot pressure. Right angle check valves are designed for higher flows with less pressure drop.

The valves’ seat and poppet are of hardened and ground steel for improved cycle life. An orifice plug can be placed in the poppet to permit a restricted flow through the valve in its normally closed position; as such, these valves are typically used in controlling the rate of decompression in a large press before shifting the main valve. Pilot operated valves, like direct operated valves, permit free flow in one direction and prevent flow in the reverse direction. However, pilot operated valves permit reverse flow when a pilot pressure signal is applied to the valve’s pilot port. The graphical symbol for these valves is shown below. Pilot operated valves have very low internal leakage and are typically used to lock a cylinder in place until the main directional valve shifts.