Valves and valve actuation – Fluid actuated or retarded – Pilot or servo type motor
Patent
1992-11-06
1994-08-23
Michalsky, Gerald A.
Valves and valve actuation
Fluid actuated or retarded
Pilot or servo type motor
251 44, F16K 31383
Patent
active
053398572
ABSTRACT:
A media assisted flow control valve having a main body provided with an inlet, and outlet, a chamber defining a flow passage connecting the inlet and the outlet, and a main valve seat around the flow passage, a main valve mounted in the chamber and having a seat surface engageable with the main valve seat to open and close the valve, the main valve having a flow passage therethrough and a pilot valve seat formed around the main valve flow passage, a pilot valve mounted for movement in the main valve, the pilot valve having a seat surface engageable with the pilot valve seat in the main valve to open and close the pilot valve, a pilot valve stem connected at one end with the pilot valve and extending at the other end exterior of the valve body, and a spring mounted on the pilot valve stem exterior of the valve body to bias the pilot valve and main valve closed. The main valve has a first surface portion upstream of the main valve seat exposed to media pressure for opening the main valve when the pilot valve is open. The main valve fits in a flow restriction relation in the valve body and has a second surface portion downstream of the flow restriction over which media pressure is reduced when the pilot valve is open permitting media pressure on the first portion of the main valve to open the main valve.
REFERENCES:
patent: 1194965 (1916-08-01), Darrow
patent: 1217792 (1917-02-01), McConnell et al.
patent: 1248777 (1917-12-01), Ahlheim
patent: 1254869 (1918-01-01), Watrous
patent: 2805039 (1957-09-01), Angelery
patent: 3033228 (1962-05-01), Mohler
patent: 3570805 (1971-03-01), Moran et al.
patent: 3667722 (1972-06-01), Katz et al.
patent: 4526340 (1985-07-01), Kolchinsky et al.
patent: 4653721 (1987-03-01), Bachmann et al.
Parker George W.
Scallan David J.
Dresser Industries Inc.
Michalsky Gerald A.
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