F - Mech Eng,Light,Heat,Weapons – 16 – K
Patent
F - Mech Eng,Light,Heat,Weapons
16
K
137/43
F16K 31/00 (2006.01) F16K 31/06 (2006.01) F16K 39/02 (2006.01)
Patent
CA 1070595
Abstract of the Disclosure A valve is disclosed which includes a housing having a valve chamber therein; a valve seat within the chamber and surrounding a valve orifice; a valve body mounted within the chamber for movement towards and away from the valve seat; and a flexible annular diaphragm secured around the valve body and secured at its outer periphery to the housing so as to divide the chamber into an inlet compartment and an outlet compartment. An inlet pas- sage communicates with the inlet compartment and an outlet passage communicates with the outlet compartment and is connectable with the inlet compartment through the orifice. The valve body has a closure member which in engageable with the valve seat in a closed condition of the valve to block communication between the inlet compartment and the outlet passage through the orifice. Electromagnetic means is energisable to draw the valve body away from the valve seat to thereby open the valve. Surfaces of the valve body and dia- phragm which are exposed to pressure of fluid within the inlet passage are relatively arranged so that the influence of the pressure on the valve member movement is substantially balanced, but for a pressure bias urging the valve member towards the valve seat; and a surface of the valve closure member exposed to the outlet passage is arranged relative to an opposed surface of the housing such that, when the valve is open, fluid flowing between the surfaces from the inlet compartment to the outlet passage, creates a venturi effect whereby movement of the valve body towards the valve seat is facilitat- ed during closing of the valve; the arrangement being such that the venturi effect and the pressure bias function to cause closing movement of the valve body when the electromagnetic moans is de-energised.
290635
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