Pumps – One fluid pumped by contact or entrainment with another – Liquid pumped by supplying or exhausting gaseous motive...
Reexamination Certificate
2009-01-30
2011-11-15
Freay, Charles (Department: 3746)
Pumps
One fluid pumped by contact or entrainment with another
Liquid pumped by supplying or exhausting gaseous motive...
C417S130000, C417S131000, C137S413000
Reexamination Certificate
active
08057192
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. An aperture in the primary piston and passages may also be provided to prevent build-up of gas pressures and maintain pressures in preselected regions within the pump at atmospheric pressures.
REFERENCES:
patent: 832394 (1906-10-01), Latta et al.
patent: 3856035 (1974-12-01), Fujiwara
patent: 3972650 (1976-08-01), Brennan
patent: 4025236 (1977-05-01), Fujiwara
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: 6634891 (2003-10-01), Cheng
Cole Dan Walter
Page, Jr. George W.
Freay Charles
McNees Wallace & Nurick LLC
Spence Engineering Company, Inc.
LandOfFree
Cyclic condensate pump having a three-way 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 Cyclic condensate pump having a three-way valve, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Cyclic condensate pump having a three-way valve will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-4260468