Soft start valve

Details Soft start valve Soft start valve

1999-03-04

2000-09-19

Walberg, Teresa

Pumps

With condition responsive pumped fluid control

Expansible chamber pump distributor operation modified

417295, F04B 4900

Patent

active

061202606

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.

REFERENCES:
patent: 4171469 (1979-10-01), Boehringer
patent: 4208034 (1980-06-01), Ohlsson
patent: 4354519 (1982-10-01), Bjorklund
patent: 4538641 (1985-09-01), Chatterjea
patent: 4612766 (1986-09-01), Eder
patent: 4637434 (1987-01-01), Moen
patent: 4911467 (1990-03-01), McCullagh
patent: 5088467 (1992-02-01), Mesenich
patent: 5133186 (1992-07-01), Weissinger
patent: 5199855 (1993-04-01), Nakajima et al.
patent: 5280773 (1994-01-01), Henkel
patent: 5318272 (1994-06-01), Smith
patent: 5542384 (1996-08-01), Rosenmann et al.
patent: 5551541 (1996-09-01), Forster
patent: 5699829 (1997-12-01), Weller, Jr. et al.
patent: 5911239 (1999-06-01), Barthalow et al.
patent: 6039070 (2000-03-01), Zaehe
Romheld Hochdruckhydraulik Product Catalog and drawing of Romheld Valve (undated).

Affiliated with

Also associated with

Rating

Soft start valve does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Soft start valve, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Soft start valve will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1065889