Backseating and stop for valve operator

Details Backseating and stop for valve operator Backseating and stop for valve operator

1980-02-27

1981-12-29

Rosenthal, Arnold

Fluid handling

Destructible or deformable element controlled

Heat destructible or fusible

251214, 251330, F16K 3150, F16K 3314

Patent

active

043077455

ABSTRACT:
In a gate valve, which has a backseat which is made up only when the normally non-rising operator stem is permitted to rise a short distance, and in order that a smaller-diameter stem may be used than one which is of sufficient area where it passes through the stem packing to cause the internal pressure within the valve cavity to generate sufficient force to overcome the frictional forces resisting stem movement developed by the internal pressure between the gate plates and the seats, so that the stem may rise when it is supposed to, to make the backseat, a system of clearances is provided between the stem nut and the gate plates. A different stop arrangement is shown for limiting rising of the gate, for defining the fully open position of the gate.

REFERENCES:
patent: Re29679 (1978-06-01), Boitnott
patent: 1976796 (1934-10-01), Milner
patent: 3349789 (1967-10-01), Crain et al.
patent: 3710860 (1973-01-01), Holbert, Jr.
patent: 3789875 (1974-02-01), McGee
patent: 3990679 (1976-11-01), Boitnott
patent: 4125060 (1978-11-01), McGee
patent: 4138091 (1979-02-01), McGee
patent: 4149558 (1979-04-01), McGee

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