Check valve system for fire extinguisher

Details Check valve system for fire extinguisher Check valve system for fire extinguisher

1988-08-24

1990-01-02

Peters, Jr., Joseph F.

Fire extinguishers

Portable vessels

Gas pressure

169 74, A62C 2310

Patent

active

048906778

ABSTRACT:
A check system for a chemical fire extinguisher utilizes a normally-closed check valve to prevent escape of pressurized chemical during periodic maintenance of a pressure monitoring system, such as a pressure gauge. An actuator member which is disposed within the flow channel of the fire extinguisher system is used to apply a force to the check system whereby a normally-closed check valve is urged to its open state. This open state establishes communication between the interior of the pressurized tank and the pressure monitoring system. Removal, or loosening, of a coupler, or union, which secures the pressure monitoring system to the chemical tank, permits the check valve to return to its normally-closed state. Thus, the pressure monitoring system can be removed and serviced periodically without requiring the pressurized tank to be emptied.

REFERENCES:
patent: 4019584 (1977-04-01), Allmendinger
patent: 4779683 (1988-10-01), Enk

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