Double latching valve

Details Double latching valve Double latching valve

1994-04-12

1996-07-02

Lee, Kevin

Valves and valve actuation

Balanced valves

Reciprocating

25112907, F16K 3900

Patent

active

055314228

ABSTRACT:
A double latching hydraulic valve of the type that either stays open or stays closed at high pressures and only changes state (between open or closed) at low pressures has three ports, with a main valve between the first and second ports which is opened or closed by a poppet. The first port is always in communication with a pressure chamber which biases the poppet against the main valve seat, and the pressure chamber is placed in communication with the third port, which can be connected to tank pressure, only in the open position of the poppet. Thus, a high pressure is provided in the pressure chamber to keep the poppet closed at high pressures, and a low pressure is provided in the pressure chamber to keep the poppet open at high pressures, without excessive leakage through the valve when it is closed.

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