Cyclic condensate pump having a three-way valve

Details Cyclic condensate pump having a three-way valve Cyclic condensate pump having a three-way valve

2005-04-25

2009-02-17

Freay, Charles G (Department: 3746)

Pumps

One fluid pumped by contact or entrainment with another

Liquid pumped by supplying or exhausting gaseous motive...

C417S128000, C417S134000

Reexamination Certificate

active

07491035

ABSTRACT:
A condensate pump includes a condensate reservoir, a liquid level float sensor operable to sense a liquid level within the condensate reservoir, and a pressure/vent valve including a pressure source, a pressure vent, and a primary piston slidably supported in a primary cylinder and sliding in the primary cylinder responsive to the liquid level sensor. A secondary piston is slidably supported in a secondary cylinder and moves responsive to a movement of the primary piston between a first secondary-piston position wherein the pressure source is in communication with a gas space of the condensate reservoir and the pressure vent is isolated from the gas space, and a second secondary-piston position wherein the pressure source is isolated from the gas space and the pressure vent is in communication with the gas space.

REFERENCES:
patent: 5141405 (1992-08-01), Francart, Jr.
patent: 5366349 (1994-11-01), Ilg
patent: 5401142 (1995-03-01), Yumoto
patent: 5445501 (1995-08-01), Yumoto
patent: 5655888 (1997-08-01), Yumoto
patent: 5755560 (1998-05-01), Yumoto
patent: 5941691 (1999-08-01), Stephens
patent: 6095759 (2000-08-01), Breslin
patent: 6244829 (2001-06-01), Yumoto
patent: 6634871 (2003-10-01), Ikuta

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