Gate valve structure

Details Gate valve structure Gate valve structure

1974-11-26

1976-05-18

Schwadron, Martin P.

Valves and valve actuation

Mechanical movement actuator

Particularly packed or sealed

137375, 251267, 251326, F16K 2700, F16K 3150, F16K 300

Patent

active

039572455

ABSTRACT:
A gate valve structure for use in mains carrying fluid, such as water mains or the like, the gate valve structure having a non-rising stem-type actuating mechanism. The gate valve structure includes a hollow gate member having a chamber therein open to the exterior and a valve stem which extends through the valve casing to the exterior thereof, the valve stem having exterior threads cooperating with interior threads carried by the gate member and the arrangement being such that the threads of the valve stem are completely protected from water and foreign material, such as dirt and abrasives and the like, when the gate member is in its completely opened position. This arrangement reduces torque necessary to operate the valve to the closed position.

REFERENCES:
patent: 3633873 (1972-01-01), Leopold, Jr. et al.
patent: 3662778 (1972-05-01), Leopold, Jr. et al.
patent: 3763880 (1973-10-01), Leopold, Jr. et al.
patent: 3809363 (1974-05-01), Rhodes

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