Back-flow prevention valve

Details Back-flow prevention valve Back-flow prevention valve

1980-10-10

1983-01-04

Cohan, Alan

Fluid handling

Line condition change responsive valves

Pilot or servo controlled

137565, 251 28, 251 33, 417295, 417306, F16K 31122

Patent

active

043668348

ABSTRACT:
A back-flow prevention valve assembly is disclosed for use with a vacuum pump or the like and employs a valve element movable between positions opening or closing a passageway through the assembly. In the event of pump failure, a control valve, which is operated by fluid from the pressure side of the pump, vents ambient air behind the valve element to assist it in moving rapidly to the closed position to prevent backflow. After resumption of pumping, a controlled withdrawal of ambient air behind the valve element delays opening of the valve until the pump has created a sufficient vacuum to minimize influx of air upstream when the valve opens.

REFERENCES:
patent: 1684987 (1928-09-01), Hazard
patent: 2362750 (1944-11-01), Hayward
patent: 2594132 (1952-04-01), Dalrymple
Leybold-Heraeus G.M.B.H. & Co., "Operating Instructions" for Trivac.RTM. Pumps, S30A, S60A, D30A, D60A, Cat. No. 10497, 10510, 11075, 11100, 2 pp.

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