Valve seat

Details Valve seat Valve seat

1984-07-11

1985-12-10

Schwadron, Martin P.

Valves and valve actuation

With means to increase head and seat contact pressure

Seat pressed to valve

251175, 251315, 251317, F16K 506

Patent

active

045574618

ABSTRACT:
A valve seat for use in a ball valve has a shoulder portion, an elastic lip portion, a circumferential non-contact surface, at least one recess and an intersecting portion. The shoulder portion has an engaging surface on its rear surface which contacts the contact surface of the valve casing perpendicular to the flow passage. The non-contact surface is formed on the rear face of the valve seat between the engaging surface and the lip portion and stepped away from the contact surface. The recess is formed in the shape of a groove in the non-contact surface and has its bottom flush with the rear surface of the lip portion stepped away from the contact surface in such a manner that the lip portion is not thinned so as to ensure sufficient strength of the lip portion. The intersecting portion is disposed between the engaging surface and the non-contact surface. The valve seat thus constructed keeps its sealing function with high efficiency and exhibits high durability under normal conditions and, when the internal pressure of the cavity increases anomalously, provides elasticity for effectively fulfilling its pressure relief function.

REFERENCES:
patent: 2930576 (1960-03-01), Sanctuary
patent: 2963263 (1960-12-01), Sanctuary
patent: 2989990 (1961-06-01), Bass et al.
patent: 3118650 (1964-01-01), Cooper et al.
patent: 3508736 (1970-04-01), Rhodes et al.
patent: 4236691 (1980-12-01), Wright
patent: 4385747 (1983-05-01), Renaud, Jr. et al.
American Society of Mechanical Engineers, "Pipe Threads (Except Dryseal)", 1968, p. 14.
American Society of Mechanical Engineers, "Malleable Iron Threaded Fittings", 1977, p. 3.
American Petroleum Institute, "Steel Gate Valves, Flanged and Buttwelding Ends", Jan., 1981, p. 5.
American Society of Mechanical Engineers, "Square and Hex Bolts and Screws Inch Series", 1981, pp. 4-5.
American Society of Mechanical Engineers, "Square and Hex Nuts", 1972, pp. 4-5.
Worcester Controls, "Ansi 300# Short Pattern Flanged Ball Valve Series 80", Jan., 1981.
Worcester Controls, "af51/af52 Fire-Rated Ball Valves", Sep. 1981.

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