Valves and valve actuation – With means to increase head and seat contact pressure – Seat pressed to valve
Patent
1978-04-10
1979-07-31
Weakley, Harold W.
Valves and valve actuation
With means to increase head and seat contact pressure
Seat pressed to valve
251174, 251305, 251306, F16K 2500
Patent
active
041627822
ABSTRACT:
A butterfly valve has a valve body with an improved seal assembly mounted in the groove about a flow passage in the valve body. The seal assembly has an outer metal body including a pair of spaced inner legs having outer ends thereof in sealing contact with the outer periphery of a valve disc in the closed position of the valve disc to provide a pair of spaced metal sealing surfaces with the outer periphery of the disc. An elastomeric face seal is positioned between the two spaced inner legs in sealing contact between the spaced metal sealing surfaces with the outer peripheral sealing surface of the valve disc at low pressures. An upstream inner leg is urged inwardly toward the downstream inner leg to space the upstream leg from the adjacent surface defining the groove and permit the upstream pressure to be exposed between the inner and outer upstream resilient legs thereby to urge the upstream leg tightly into contact with the adjacent peripheral sealing surface of the valve disc in the closed position thereof. The outer resilient legs are seated in the bottom of the groove to provide a substantially fluid-tight contact with the adjacent surfaces of the groove, and the inner legs are urged upon contact with the valve disc away from the valve disc toward the outer seated legs thereby to load the seal assembly with a predetermined preload pressure. Fluid is prevented by the outer legs from flowing behind the seal assembly.
REFERENCES:
patent: 3409269 (1968-11-01), Fawkes
patent: 4037819 (1977-07-01), Kindersley
ACF Industries Incorporated
Riddle Eugene N.
Weakley Harold W.
LandOfFree
Seal assembly for butterfly valve does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Seal assembly for butterfly valve, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Seal assembly for butterfly valve will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-20593