Butterfly valve with self energizing seal

Details Butterfly valve with self energizing seal Butterfly valve with self energizing seal

1975-09-30

1977-07-19

Weakley, Harold W.

Valves and valve actuation

Valve head movably connected for accommodation to seat

251148, 251173, 251307, F16K 2500

Patent

active

040364682

ABSTRACT:
An improved butterfly valve with self energizing seal, having a body with parallel faces and a substantially circular opening therethrough, and a shaft transverse to said opening. A closure disc is rigidly attached to said shaft and spaced from said shaft a selected distance, with its plane parallel to a plane through the axis of said shaft. A seal ring, comprising a thin cylindrical metal ring with an elastomeric ring bonded to the inside surface thereof, is inserted into the upstream face of said body. The elastomeric ring has an internal seating surface which is a truncated conical surface, tapering upstream, and which is tangent to a spherical surface centered at the intersection of the axes of said opening and said shaft. The edge of the closure disc is in the form of a ridge, having a peak which is circular in crosssection. When the valve is closed, by rotating the shaft, the disc is in the plane of the seating surface and the ridge has a small radial penetration into the elastomeric surface. With pressure on the upstream face, the seal is self energizing.

REFERENCES:
patent: 2924424 (1960-02-01), Titerington
patent: 3233861 (1966-02-01), Stillwagon
patent: 3250510 (1966-05-01), Williams
patent: 3282558 (1966-11-01), Swain
patent: 3314642 (1967-04-01), Kautz
patent: 3356336 (1967-12-01), Maenaka
patent: 3475007 (1969-10-01), Fawkes

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