Valves and valve actuation – Rotary valves – Seat or interface seal
Patent
1977-07-27
1978-09-12
Weakley, Harold W.
Valves and valve actuation
Rotary valves
Seat or interface seal
251174, F16K 500
Patent
active
041132319
ABSTRACT:
An improved seal ring for a ball valve comprising, a metal ring of rectangular cross section, the inner wall of which constitutes part of the axial opening for fluid flow. The upstream face of the seal ring includes means to said seal ring to the housing. The downstream face of the seal ring includes a cylindrical channel, concentric with the axial opening in the valve housing and concentric with the inner wall of the seal ring. The downstream portion of the seal ring is cut at an angle to be substantially parallel to the spherical surface of the ball against which seal is to be made. A seat ring is provided having in cross section a rectangular portion that fits into the cylindrical groove in the seal ring and has a C-shaped portion adapted to house a length of helical spring of the same diameter as the circular interior cavity of the C portion. The circular spring is inserted into the C portion of the seat ring and the seat ring is then inserted into the groove of the seal ring means and the seat is then locked into position by means of a thin-wall portion of the seal ring, which presses against a surface of the seat ring. The internal helical spring presses the seat ring tightly against the surface of the ball.
REFERENCES:
patent: 2825527 (1958-03-01), Wendell
patent: 2963260 (1960-12-01), Siravo
patent: 2988320 (1961-06-01), Kent
patent: 3883112 (1975-05-01), Milleville
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