Safety pressure relief

Details Safety pressure relief Safety pressure relief

Filed on

1985-04-11

Date issued

1987-06-02

Examiner

Schwadron, Martin P.

Patent Class

Fluid handling

SubClass

Destructible or deformable element controlled

SubSubClass

Heat destructible or fusible

Other Related Categories

137489, F16K 1714

Type

Patent

Status

active

Patent number

046694935

Description

ABSTRACT:
A safety relief valve for liquified gas containers has dual pilot valves, one set to a given operating pressure and one adjustable. A main valve is responsive to the pilots, which are connected in parallel. The adjustable pilot is continuously adjustable and may be set below the operating pressure of the set pilot. The main valve has an inlet at the tank wall and a valve seat with a lateral outlet downstream thereof. The piston is faced at the inlet side by the gas pressure in the tank and on the control-pressure space side with a closing pressure adjusted by the pilots. If a given pressure in the tank is exceeded, the piston lifts from its valve seat, so that gas can flow from the inlet to the outlet. The second pilot valve can be provided with a thermal or other enabling means to initiate its operation when desired.

REFERENCES:
patent: 2592043 (1952-04-01), Larson et al.
patent: 3583432 (1971-06-01), Powell et al.
patent: 3811471 (1974-04-01), Murase et al.
patent: 4099538 (1978-07-01), Curtis
patent: 4328672 (1982-05-01), Zumstein

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