Fluid handling – Line condition change responsive valves – Direct response valves
Patent
1980-04-07
1982-06-22
Walton, George L.
Fluid handling
Line condition change responsive valves
Direct response valves
137529, 138 42, 251 86, 251127, 251 635, F16K 31122, F16K 1500
Patent
active
043357440
ABSTRACT:
A relief valve (10) having both spring biasing means (116) and air pressure biasing means (114). The spring biasing means (116) includes a plurality of spring washers (132) acting between the valve body (12) and a valve member (74). The air biasing means (116) includes an air cylinder defined by an intermediate portion (20) of the valve body (12), and a piston (118) disposed within the cylinder and acting on the valve member (74). An air inlet port (48) is provided above the piston (118) to permit the area above the piston (118) to be pressurized to add to the biasing force of the spring biasing means (116), and an air inlet port (52) is provided below the piston (118) to permit the area below the piston (118) to be pressurized to open the valve manually for testing and exercising. A "quiet" element (102) surrounds the valve member (74) to reduce the sound level of the fluid flowing through the valve when the valve opens.
REFERENCES:
patent: 73602 (1868-01-01), Hendrick
patent: 1799667 (1931-04-01), Ziegler
patent: 2675204 (1954-04-01), Johnson
patent: 2759699 (1956-08-01), Rush
patent: 3141474 (1964-07-01), Gentzel
patent: 3331583 (1967-07-01), Baker
patent: 3347286 (1967-10-01), Smith
patent: 3379405 (1968-04-01), Natho
patent: 3688800 (1972-09-01), Hayner et al.
patent: 3780767 (1973-12-01), Borg et al.
patent: 3838707 (1974-10-01), Wachowitz, Jr.
Control Components Inc.
Edwards Robert J.
Walton George L.
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