Pumps – Condition responsive control of pump drive motor – By stopping pump in response to leakage into or from system
Patent
1991-08-09
1992-12-29
Smith, Leonard E.
Pumps
Condition responsive control of pump drive motor
By stopping pump in response to leakage into or from system
417 12, 417 46, 417403, 91221, 91247, F04B 4902
Patent
active
051747227
ABSTRACT:
A safety shutdown circuit for a pneumatic pump system. The pump system includes a manifold assembly for discharging pumped liquid. The liquid is discharged from the system by a reciprocating piston apparatus which drives a liquid pump cylinder. The pump system is provided with a pneumatic safety circuit for monitoring the stroke time or rate of the reciprocating air cylinder. The safety circuit includes a safety shutdown valve and a pneumatic timer associated with the shutdown valve. The pneumatic timer vents air supply within the safety circuit after a predetermined time interval. If a leak or failure occurs in the pump system, the reciprocating piston apparatus will complete a stroke in less time than the predetermined time as a result of the pressure loss incident to the leak or failure. In such event, the air supply within the safety circuit is directed through the shutdown valve to the pump system START valve to deactivate the system.
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Bomar Corporation
Smith Leonard E.
Smith Richard J.
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