F - Mech Eng,Light,Heat,Weapons – 16 – K
Patent
F - Mech Eng,Light,Heat,Weapons
16
K
251/76
F16K 3/16 (2006.01) F16K 3/18 (2006.01) F16K 3/316 (2006.01)
Patent
CA 1218346
Abstract An expanding gate valve having a pressure-secured seat. The valve includes a valve body having a cavity formed therein and an inlet and outlet formed in the body, both of which intersect the cavity. A counterbore is formed about the circumference of both the inlet and the outlet at their respective intersections with the cavity. An annular seat having a rear surface and a front seat surface is received within the inlet counterbore. An annular seal is formed on the front seat surface and a second annular seal is disposed between the rear surface and the valve body. The front annular seal has a sealing diameter greater than the rear annular seal and an annular recess is formed on the front seat surface on the radially inward side of the annular seal. A second annular seat having a planar front seat sur- face is received within the outlet counterbore. An expan- dable gate is mounted for selective vertical positioning in the cavity for permitting flow between the inlet and outlet in one position and for sealing off such flow in another position. When in position for sealing off such flow, the gate is expanded into sealing engagement with the first and second seats.
429736
Barton Valve Company Inc.
Ridout & Maybee Llp
LandOfFree
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