F - Mech Eng,Light,Heat,Weapons – 16 – K
Patent
F - Mech Eng,Light,Heat,Weapons
16
K
137/108
F16K 1/32 (2006.01) F16K 39/02 (2006.01)
Patent
CA 1047362
IMPROVED BI-DIRECTIONAL PRESSURE BALANCED VALVE Abstract of the Disclosure An improved bi-directional pressure balanced valve includes a body having a cylindrical valve chamber and a pair of flow passages intersecting the lower portion of the chamber. An annular valve seat is located between the lower portion and a first of the flow passages and is coaxially aligned with the cylindrical valve chamber. A main valve disc assembly is mounted for axial movement within the cylindrical valve chamber for selective engagement of a main disc thereof with the seat and further includes a concentric hollow shaft extending from the main disc away from the seat and terminating at a piston fitting which is slidably received within an upper portion of the cylindrical valve chamber. A coaxially aligned valve stem extends from an operating mechanism located above the valve through the upper portion, the piston fitting and the hollow shaft to terminate at an auxiliary valve disc. An axial opening through the main valve disc assembly allows communication between a region above the disc assembly and a region below the main disc to substantially control fluid forces acting on the opposite sides of the main valve disc assembly to facilitate opening and closing of the valve regardless of the direction of the fluid flow through the valve. Control of the fluid forces is partially obtained through predetermined axial positioning of the auxiliary valve disc during operation of the valve stem to open and close the axial opening through the main valve disc assembly. The improvement includes a deflecting device at the axial opening to prevent an over balancing of the main valve disc assembly when fluid flow from the first flow passage impinges on the axial opening during closure of the valve. The preferred deflecting device includes a circular deflector plate which is mounted on the main disc to be centrally aligned with the axial opening and perpendicular thereto and having a diameter substantially larger than the diameter of the axial opening. The diameter plate is parallel with the lower surface of the main disc and it is separated therefrom to require fluid entering the axial opening to first flow between the lower surface and the deflector plate.
265299
Pavagadhi Lalji J.
Pool Eldert B.
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