High pressure pilot operated valve

Details High pressure pilot operated valve High pressure pilot operated valve

1985-09-30

1987-02-24

Michalsky, Gerald A.

Fluid handling

Systems

Multi-way valve unit

13762566, 13762568, F15B 13043

Patent

active

046449710

ABSTRACT:
A high pressure pilot operated valve includes a housing with inlet and outlet passages, an internal bore communicating the passages and slide valve member movable between a first position blocking fluid flow and a second position permitting fluid flow. A spring in a low pressure chamber urges the slide valve member in the closing direction. A stem on the opposite end of the slide valve member is selectively exposed to a control pressure by means of a pilot valve connected to high pressure fluid to cause the slide valve member to move to the second position. The inlet passage communicates with the hollow interior of the slide valve member and with metering orifices in its sidewalls. A passage in the slide valve member having a radial conduit opening against the bore near its stem end connects the outlet passage with a low pressure chamber when the slide valve member is in the first position and is blocked when in the second position. A plurality of dynamic seals in the bore operate to contain high inlet pressure when the valve is closed and are spaced from the outlet passage and the radial conduit to protect them from high pressure flows when the valve is opened.

REFERENCES:
patent: 4458718 (1984-07-01), Vick

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