F - Mech Eng,Light,Heat,Weapons – 16 – K
Patent
F - Mech Eng,Light,Heat,Weapons
16
K
137/16
F16K 31/122 (2006.01) F16K 31/365 (2006.01) F16K 51/02 (2006.01)
Patent
CA 1156122
BACK-FLOW PREVENTION VALVE David E. Hanson And Martin E. Frenkel ABSTRACT OF THE DISCLOSURE A back-flow prevention valve assembly is disclosed for use with a vacuum pump or the like and employes 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 mov- ing 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.
387717
Frenkel Martin E.
Hanson David E.
Osler Hoskin & Harcourt Llp
Sargent-Welch Scientific Company
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