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US 4,460,155 AGranted
Tank discharge valve with pressure assisted seat
AssigneeXomox Corporation
InventorRussell G. Smith
Life of this patent
Estimating the term…
Abstract
A plug valve for controlling discharge of a fluid tank has an upper surface continuously subjected to the weight and pressure of the tank's contents. Pressure applied to this upper surface is transmitted through the valve to assist sealing with a member subjacent to the valve's plug.
Claims5
In a fluid tank, the combination comprising:
- a valve body disposed substantially interiorly of the tank and secured to an opening therein;
- a valve plug rotatably fitted with said valve body and being operative to control fluid flow through the opening in the tank in accordance to its position relative to the valve body, said valve plug having an upper surface continuously, directly subjected to the weight and pressure of the tank contents;
- a packing member subjecent to a lower surface of the valve plug which compresses in response to weight of the tank contents and sealingly interfaces with the valve plug with a sealing pressure which is dependent upon the weight and pressure of the tank contents applied to said upper surface of said plug valve;
- and
- means for establishing sealing pressure between said valve plug and said sealing member independent of pressure applied to said upper surface.
2 more elements
A tank car valve, said valve comprising;
- a valve body, said body being substantially disposed within the interior of said tank car, said body being secured to an opening in the bottom of said tank car;
- a plug valve, said valve being rotatably fitted within said valve body, said valve controlling the fluid flow through said opening in said bottom of said tank car, said valve having an upper surface, said upper surface being continuously directly exposed to the pressure of said tank car contents during all operational modes;
- means for sealing said valve, said means being located subjecent to the lower surface of said valve, said means being compressingly responsive to said pressure of said tank car contents, said compressingly response being dependent upon the pressure which said tank car contents apply at any given time to said upper surface of said valve;
- and means for compressing said means for sealing said valve, said means being independent of said pressure of said tank car contents, said means for compressing said means for sealing said valve being operatively connected to said bottom surface of said valve.
1 more element
Dependencies are inferred from the claim text.