Fluid handling – Control by change of position or inertia of system – Vent opening or closing on tipping container
Patent
1992-05-15
1993-09-21
Nilson, Robert G.
Fluid handling
Control by change of position or inertia of system
Vent opening or closing on tipping container
137494, 220203, F16K 1704
Patent
active
052460274
ABSTRACT:
The relief valve assembly has a spring-loaded poppet valve that vents the interior of a transport tanker to the atmosphere when gaseous pressure within the tank exceeds a predetermined limit. Sudden surge protection from a pressure spike created by liquid within the tank during the instant that the tank strikes the ground during accidental roll over is provided to keep the poppet valve closed during the surge condition. A reaction piston having one face that counteracts the face of the poppet valve is exposed to pressure within the tank simultaneously with the poppet valve, but the counteracting effect of that surface is normally overcome by a neutralizing chamber on the opposite side of the reaction piston which is likewise exposed to the interior of the tank. While gaseous pressure can reach all working surfaces of the valve essentially at the same time during gradual, progressive pressure buildup, in a sudden surge situation the liquid is restricted by port means from instantaneously entering the neutralizing chamber so that the reaction piston instead holds the poppet closed at this time. Once the initial liquid surge has passed, pressure within the tank can gradually enter the neutralizing chamber to allow the poppet valve to open in the usual manner if pressure exceeds the predetermined limit.
REFERENCES:
patent: 4587988 (1986-05-01), Schulte
patent: 5048553 (1991-09-01), Vandevyver
Clay and Bailey Manufacturing Company
Nilson Robert G.
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