Pumps – Condition responsive control of pump drive motor – With condition responsive control of pump fluid valve
Patent
1977-08-19
1979-02-20
Croyle, Carlton R.
Pumps
Condition responsive control of pump drive motor
With condition responsive control of pump fluid valve
137508, 200 83Q, 417 28, 417311, 417440, F04B 4902, F04B 4908
Patent
active
041404360
ABSTRACT:
A device is provided for monitoring and controlling the above-ambient pressure in a system by comparing a net pressure force, produced by the system pressure on a pair of diaphragms having unequal areas, with a net spring force produced by a pair of opposed springs which clamp together a valve member and a valve seat in a pressure-relief member. The valve seat is connected by a passage to a port which is connected to the system pressure. While thus clamped together, the valve member and the pressure-relief member travel together through most of the total stroke created by movement of the pair of diaphragms and activate a microswitch for admitting additional fluid to the system when the system pressure is insufficient. If the net pressure force is sufficiently greater than the net spring force because of excessive system pressure, a port is opened when the valve strikes a stop and the pressure-relief member continues to move. The device is suitable for systems at below-ambient pressures by reversing the inequality of the diaphragms.
REFERENCES:
patent: 1938327 (1933-12-01), Green
patent: 2888947 (1959-06-01), Montgomery et al.
patent: 3164414 (1965-01-01), Stelzer
patent: 3258029 (1966-06-01), Parrino
patent: 3446238 (1969-05-01), Norstrud et al.
patent: 3859484 (1975-01-01), Nelson
patent: 3973877 (1976-08-01), Taki
Ebisawa Hisashi
Schumacher Ernest W.
Croyle Carlton R.
Look Edward
Virginia Chemicals Inc.
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