Pressure independent control valve

Details Pressure independent control valve Pressure independent control valve

2005-08-01

2008-11-18

Hepperle, Stephen M (Department: 3753)

Fluid handling

Line condition change responsive valves

With separate connected fluid reactor surface

Reexamination Certificate

active

07451781

ABSTRACT:
The invention provides valves of the type employing a differential pressure regulator and a characterized valve with a mechanism to enhance control of fluid flow independently of system pressure. The valves of the invention are especially suitable for HVAC applications, and provide operation with improved accuracy over a greater flow range with a reduced risk of hunting. In one preferred aspect, the invention provides improvements by the employment in the differential pressure regulator of a diaphragm with a cup arranged to provide a small leakage, thereby dampening the response of the regulator. In another aspect, a baffle is provided to protect the downstream side of a control disk forming part of the differential pressure regulator.

REFERENCES:
patent: 1699676 (1929-01-01), Rush
patent: 4092998 (1978-06-01), Taplin
patent: 4422470 (1983-12-01), Jackson et al.
patent: 5143116 (1992-09-01), Skoglund
patent: 6039304 (2000-03-01), Carlson
patent: 6827100 (2004-12-01), Carlson

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