Actuator for expanding gate valves

Details Actuator for expanding gate valves Actuator for expanding gate valves

1976-10-04

1978-08-01

Schwadron, Martin P.

Valves and valve actuation

Fluid actuated or retarded

Dashpot or fluid controlled retarder or timer

91 25, 251 635, 251196, F16K 31122

Patent

active

041038630

ABSTRACT:
A valve actuator for an expanding gate valve having a gate and a segment thereon. The actuator includes a piston connected to a gate stem and mounted within a cylinder with a pressurized gas on the upper side of the piston and liquid on the lower side of the piston. The gate valve moves from an open position to a closed position across the flow passage at a rapid rate and decelerates adjacent the end of its downward movement upon a metering of the liquid in the cylinder. The expanding gate valve expands laterally into fluid-tight sealing relation at the end of the downward stroke after moving across the flow passage. The bonnet is mounted internally of the valve body and a pressure seal is positioned between the bonnet and the valve body to permit operation of the valve actuator and gate valve even after failure of the pressure seal.

REFERENCES:
patent: 2363142 (1944-11-01), Reed
patent: 2398997 (1946-04-01), Berry et al.
patent: 2583512 (1952-01-01), Lauvent
patent: 2676780 (1954-04-01), Wheatley
patent: 2918085 (1959-12-01), Govan et al.
patent: 2949894 (1960-08-01), Hewitt
patent: 3003742 (1961-10-01), Kearns
patent: 3067726 (1962-12-01), Williams
patent: 3086745 (1963-04-01), Natho
patent: 3226078 (1965-12-01), Anderson
patent: 3450003 (1969-06-01), Nightingale

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