Valves and valve actuation – With means to increase head and seat contact pressure – With positive reduction
Patent
1979-10-09
1981-11-24
Weakley, Harold W.
Valves and valve actuation
With means to increase head and seat contact pressure
With positive reduction
251169, 251197, F16K 2500
Patent
active
043019935
ABSTRACT:
A new and improved gate valve suitable for use with high pressure, high temperature corrosive fluids such as those developed in coal gasification processes, uranium enrichment and the like comprises a valve body having a flow passage with a pair of opposed annular valve seats and a gate assembly mounted for movement transversely of the flow passage between a valve seat confronting position and an open position displaced transversely outwardly of the passage. The gate assembly includes a pair of flat spring flexure elements which support a pair of valve discs for movement toward and away from the valve seats when the assembly is in the valve seat confronting position. These flexure elements normally bias the valve discs out of engagement with the valve seats. The discs are interconnected by an upwardly bowed flexure element which is retained between upper and lower holding members connected to the transversely extending stem of the gate valve.
In a sequence of operation, the gate assembly is first moved transversely into the valve body to a valve seat confronting position in which the valve discs are aligned with but spaced from the opposed annular valve seats of the valve body. Continued movement of the valve stem exerts a downward force on the upwardly bowed flexure element so that it is flattened and forces the valve discs outwardly into engagement with the valve seats against the biasing force of the flexure disc mounting elements. The gate valve is opened by first relieving the pressure on the flattened upper flexure element so that it assumes its normal bowed configuration and in so doing moves the valve discs laterally away from the valve seats. The biasing action of the disc flexure mounting elements also assists in returning the discs to their spaced apart confronting position as soon as downward force on the upper flexure element is removed. The entire gate assembly is thereafter moved transversely out of the valve seat confronting position into the open position remote from the valve passage.
REFERENCES:
patent: 680714 (1901-08-01), Jefferson
patent: 2861770 (1958-11-01), Bredtsohueiden
patent: 2906491 (1959-09-01), Young
patent: 4052036 (1977-10-01), Schertler
Consolidated Controls Corporation
Weakley Harold W.
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