Gate valve

Details Gate valve Gate valve

1979-10-09

1981-09-22

Weakley, Harold W.

Valves and valve actuation

With means to increase head and seat contact pressure

With positive reduction

251197, 251199, F16K 2500

Patent

active

042905800

ABSTRACT:
A new and improved gate valve suitable for use with high pressure, high temperature fluids such as those developed in coal gasification processes and the like which comprises a valve gate assembly including opposed outwardly facing valve discs is bodily movable from a valve open position to a valve seat confronting position in which the valve discs are aligned with but spaced from opposed valve seats in the flow passage. Upon further downward movement of the valve stem the valve discs are moved laterally outwardly into engagement with the valve seats. In order to accommodate situations where the opposed valve seats are spaced relatively close together, the valve discs are mounted on annular spring washers which normally bias said valve discs away from said valve seats. A pair of toggle elements are actuated by downward movement of the valve stem to force the valve discs laterally outwardly into engagement with the valve seats after the assembly has been moved to the valve seat confronting position.

REFERENCES:
patent: 3610573 (1971-10-01), Robertson

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