Air actuated valve system with seismic controller

Details Air actuated valve system with seismic controller Air actuated valve system with seismic controller

1989-07-31

1990-05-01

Nilson, Robert G.

Fluid handling

Control by change of position or inertia of system

137 46, 251 29, F16K 1736

Patent

active

049209990

ABSTRACT:
An air actuated valve system for shutting off fluid flow in a fluid conduit includes a seismic valve disposed in a seismic air circuit which is coupled to a primary air circuit. The primary air circuit delivers air at a high pressure to an air driven actuator which maintains a shut off valve in a fluid conduit in an open position. The high air pressure flows through an air switch which is operationally open and coupled to the seismic air circuit such that when the seismic valve is closed a pilot air pressure is prevented from flowing to the air switch. In the absence of the pilot air pressure, air pressure is bled from the air switch, causing the air switch to move from an open to a closed position, thus preventing air from flowing to the air actuator.

REFERENCES:
patent: 3043321 (1962-07-01), Hewitt
patent: 3089512 (1963-05-01), Julien
patent: 3948478 (1976-04-01), Vind
patent: 4094332 (1978-06-01), Poff
patent: 4174729 (1979-11-01), Roark
patent: 4197867 (1980-04-01), Roger
patent: 4503717 (1985-03-01), Keller

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