Fluid handling – Control by change of position or inertia of system
Patent
1988-10-07
1989-08-01
Nilson, Robert G.
Fluid handling
Control by change of position or inertia of system
137 46, 137557, 251 29, F16K 1736
Patent
active
048526002
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.
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patent: 3948478 (1976-04-01), Vind
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patent: 4174729 (1979-11-01), Roark
patent: 4197867 (1998-04-01), Roger
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Asbra Andrew F.
Asbra Martin R.
Bovis Nicholas J.
Greer Charles W.
Andrene Associates
Asbra Martin R.
Diamond Donald
Nilson Robert G.
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