Soft start valve

Details Soft start valve Soft start valve

1998-11-17

2000-06-27

Walberg, Teresa

Pumps

With condition responsive pumped fluid control

Inlet throttle or stop valve

417206, 417289, 417 53, 123531, 12317931, 137495, 1375992, 137383, F04B 4900

Patent

active

060799579

ABSTRACT:
A fluid pumping apparatus (10) includes a soft start valve (16) coupled with the outlet of a pump (14) driven by an electric motor (12) for reducing the startup current of the motor (12). The preferred valve (16) includes a fluid chamber (32), a valve operator in the nature of a ball (22) shiftable in the chamber (32) between the inlet (36) and a valve seat (48), and a biasing assembly (24) including an axially shiftable rod (54) and a spring (56) for biasing the rod (54) against the ball (22) in order to bias the ball (22) toward the chamber inlet (36). Upon startup, the valve (16) provides a reduced start pressure, less than the pump pressure under load, at the inlet (36) as the operator (22) moves toward the seat (48). The chamber (32) presents a volume sufficient for the valve (16) to provide the start pressure long enough for the motor (12) to achieve synchronous speed, thereby reducing motor startup current.

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patent: 5699829 (1997-12-01), Weller, Jr. et al.
patent: 5911239 (1999-06-01), Barthalow et al.

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