F - Mech Eng,Light,Heat,Weapons – 16 – K
Patent
F - Mech Eng,Light,Heat,Weapons
16
K
137/16
F16K 15/00 (2006.01) E03C 1/10 (2006.01) F16K 15/02 (2006.01) F16K 17/00 (2006.01)
Patent
CA 1066164
ABSTRACT OF THE DISCLOSURE A check valve having a poppet moving axially to engage a seat employs axially spaced flanges on the poppet slidably guided within a stationary barrel. The flanges define an annular groove which is ported to a closed chamber within the barrel. The force of a spring acting on the poppet to close the the valve is partially overcome by a drop in pressure of the chamber. This pressure reduction is brought about by reason of the projection of a portion of one of the flanges into the discharge passage of the check valve assembly, the pressure reduction being reflected through the groove and port of the chamber. Two identical check valve assemblies of this type are connected in series, the assemblies being perpendicular to each other, each being mounted at about a 45° angle with respect to coaxial inlet and outlet terminals. This double check valve assembly is combined with a differential control valve which acts to vent a zone between the check valves to atmosphere whenever backflow conditions are imminent, and thereby prevent reverse flow through the assembly.
212300
Griswold David E.
Veit Richard E.
LandOfFree
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