Force feedback poppet valve having an integrated pressure...

Details Force feedback poppet valve having an integrated pressure... Force feedback poppet valve having an integrated pressure...

2007-05-31

2009-11-24

Lazo, Thomas E (Department: 3745)

Motors: expansible chamber type

With motive fluid valve

Relatively movable serial valves

C251S030040

Reexamination Certificate

active

07621211

ABSTRACT:
The force feedback poppet valve includes a valve body having a main chamber, a first port, and a second port. The force feedback poppet valve further includes a main poppet disposed within the main chamber and movable between an open position and a closed position to control fluid flow between the first port and the second port. The main poppet forms a control chamber within the main chamber. The force feedback poppet valve further includes a first passage communicating the control chamber with the second port, a second passage communicating the control chamber with the first port, and a pilot valve having a pilot poppet for controlling fluid flow between the control chamber and the first port through the second passage. The force feedback poppet valve further includes a pressure compensator disposed within the main poppet, and fluidly connected to the second port via the first passage. The force feedback poppet valve further includes a first spring coupled between the main poppet and the pilot poppet to provide a force proportional to a distance between the main poppet and the pilot poppet, and a second spring coupled between the pressure compensator and the pilot poppet to provide a force proportional to a distance between the pressure compensator and the pilot poppet.

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