Vent valve

Details Vent valve Vent valve

1979-04-19

1981-05-12

Nilson, Robert G.

Fluid handling

Systems

Sequentially progressive opening or closing of plural valves

137522, 137541, 137587, 137628, 141302, 251 635, F16K 3112

Patent

active

042665744

ABSTRACT:
A system for filling and emptying a fluid storage tank includes an air pressure source 11, a vent valve 12, and a fill valve 14. The vent valve 12 includes first and second housing portions 23 and 24 and a main valve member 18. A coil spring 20 acts between the second housing portion 24 and a valve stem 19 to close the main valve member 18 and to bias the housing portions 23 and 24 together. A piston 21 cooperates with the second housing portion 24 to define an expansible chamber 39, and air pressure from the source 11 enters the chamber 39 to move the piston 21 and open the main valve member 18. A secondary valve member 40 isolates the fill valve 14 from the air pressure source 11 until the main valve member 18 is opened, and then communicates air pressure to the fill valve 14 to open the fill valve 14 and permit filling or emptying the tank.

REFERENCES:
patent: 507901 (1893-10-01), Grist
patent: 2409071 (1946-10-01), Scott
patent: 2608210 (1952-08-01), StClair
patent: 3115894 (1963-12-01), Marx
patent: 3125320 (1964-03-01), DeFrees
patent: 3144056 (1964-08-01), Mosher
patent: 3251375 (1966-05-01), Reed
patent: 3486528 (1969-12-01), DeFrees
patent: 3770011 (1973-11-01), Muehl
patent: 3771549 (1973-11-01), Lemon
patent: 3981325 (1976-09-01), Robinson
Parker-Hannifin Drawing No. AIP F646; May 1974.

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