Fluid handling – Line condition change responsive valves – With separate connected fluid reactor surface
Reexamination Certificate
2001-04-05
2002-10-22
Hepperle, Stephen M. (Department: 3753)
Fluid handling
Line condition change responsive valves
With separate connected fluid reactor surface
C137S454500, C137S454600
Reexamination Certificate
active
06467501
ABSTRACT:
BACKGROUND AND SUMMARY OF THE INVENTION
Fluid flow regulators (controllers) provide a constant flow rate by means of a pressure differential regulating device that senses changes in upstream or downstream fluid pressure and compensates for the change. Conventional regulating devices use an impeller or a piston that is sensitive to a variable incoming fluid pressure, P
1
, and a downstream fluid pressure, P
2
. The piston reduces a valve opening when the differential pressure between P
1
and P
2
increases and enlarges the valve opening when the pressure differential between P
1
and P
2
is reduced.
Examples of such regulators may be found in U.S. Pat. Nos. 5,931,191 issued Aug. 3, 1999, to Frank A. Taube, John D. Taube, and Peter H. Greverath for “Flow Control Valve for Passing Two Fluids in Opposite Directons”; U.S. Pat. No. 5,913,328 issued Jun. 22, 1999 to John D. Taube, Peter H. Greverath and Eric Geile for “Flow Control Valve with One Piece Plug/Valve Tube Sleeve Assembly”; and U.S. Pat. No. 5,979,495, issued Nov. 9, 1999, to Frank A. Taube and Anthony J. Vizzini for “Adjustable Low Flow High Pressure Regulator”. In each case the flow rate of the regulator is adjusted by an adjusting means, such as a needle valve, disposed in a fluid passage that connects incoming fluid pressure P
1
on one side of the impeller, to the opposite side of the impeller which is at pressure P
2
.
The broad purpose of the present invention is to provide an improved fluid flow controller in which the flow rate adjusting valve is mounted on the controller body adjacent one end of the impeller chamber. The piston is balanced by the incoming pressure at P
1
acting against one side of the piston, the adjusted fluid pressure P
2
biasing the opposite side of the piston, and an impeller spring. The piston moves to either open or close a variable orifice or port connecting the impeller chamber to the outlet opening in response to changes in either the inlet fluid pressure or the outlet fluid pressure.
The preferred controller comprises a minimal number of components that can be easily manufactured.
Still further objects and advantages of the invention will become readily apparent to those skilled in the art to which the invention pertains upon reference to the following detailed description.
REFERENCES:
patent: 2843141 (1958-07-01), Arnot et al.
patent: 3100620 (1963-08-01), Kates
patent: 3223115 (1965-12-01), Kates
patent: 5251655 (1993-10-01), Low
patent: 5913328 (1999-06-01), Taube et al.
patent: 5931191 (1999-08-01), Taube et al.
patent: 5979495 (1999-11-01), Taube et al.
Geile Eric A.
Mudge Bryan E.
Chandler Charles W.
Hepperle Stephen M.
W. A. Kates Company
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