Maintenance alarm actuator

Details Maintenance alarm actuator Maintenance alarm actuator

1977-05-25

1978-09-26

Queisser, Richard C.

Signals and indicators

Alarms

Fluid-pressure variation

116114PV, 210 90, G01L 1912

Patent

active

041161564

ABSTRACT:
A maintenance alarm actuator for a fluid filter actuates an alarm when contaminant has accumulated in the filter. The actuator is connected to fluid lines upstream and downstream of the filter. Included in the actuator are a valve and a biasing mechanism which biases the valve. The valve responds to the difference in the line pressures, and the actuator is initially triggered when the pressure of the upstream line exceeds that of the downstream line by an amount sufficient to overcome the force of the biasing mechanism. When initially triggered, the actuator vents the downstream line to the alarm, thereby increasing the difference in line pressure and causing itself to trigger completely.

REFERENCES:
patent: 2678134 (1954-05-01), Middleton
patent: 3011470 (1961-12-01), Stoermer
patent: 3474906 (1969-10-01), Tennis
patent: 3495566 (1970-02-01), Pall

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