Pumps – Condition responsive control of pump drive motor – Responsive to accumulation of pumped liquid in receiver
Patent
1997-05-01
1999-07-27
Freay, Charles G.
Pumps
Condition responsive control of pump drive motor
Responsive to accumulation of pumped liquid in receiver
417 43, 417 449, F04B 4903
Patent
active
059279508
ABSTRACT:
The device comprises: a flowstat 16 with a slider 16B with a built-in magnet 22 designed to interfere with a proximity-operated electric switch 20A; a variable-volume chamber 1 with a flexible wall 9 and spring means 28 that tend to reduce its volume; and a slider 26 combined with said flexible wall 9 and comprising a cam profile 30 acting on the movable slider 16B of the flowstat in the event of a drop in pressure in said chamber 1, in order to displace said slider 16B in the same direction in which the slider is displaced by the flow that passes through the flowstat; by this means the pump is actuated to restore the pressure in said chamber 1; whereas when the pressure in said chamber 1 drops further, owing to a lack of supply of liquid to the pump, the cam profile 30 ceases to act on the movable slider 16B and the pump stops.
REFERENCES:
patent: 790246 (1905-05-01), Atzberger
patent: 818525 (1906-04-01), Danke
patent: 3150684 (1964-09-01), Guinard et al.
patent: 5190433 (1993-03-01), Valdes
patent: 5259733 (1993-11-01), Gigliotti et al.
patent: 5509787 (1996-04-01), Valdes
Evora Robert Z.
Freay Charles G.
LAPA Services S.r.l.
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