Pilot operated valve with fast closing poppet

Details Pilot operated valve with fast closing poppet Pilot operated valve with fast closing poppet

2011-07-26

2011-07-26

Rivell, John (Department: 3753)

Valves and valve actuation

Fluid actuated or retarded

Pilot or servo type motor

C251S030010, C137S269000

Reexamination Certificate

active

07984890

ABSTRACT:
A pilot-operated valve has a main poppet controlling fluid flow between inlet and outlet ports in response to pressure in a control chamber. Fluid flow through a pilot passage, linking the control chamber and the outlet port, moves an exhaust spool between first and second positions to control fluid flow through passages in the main poppet. The first position blocks flow between the control chamber and the outlet port and provides a path between the control chamber and the inlet port. In the second position, flow between the control chamber and the outlet port is enabled, and a second path, that is more restricted than the first path, is provided between the control chamber and the inlet port. When the valve closes, flow through the first path allows movement of the main poppet at a faster rate than during opening when flow occurs through the more restricted second path.

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patent: 7784488 (2010-08-01), Holder et al.
patent: 2007/0157980 (2007-07-01), Stephenson et al.

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