Flow control valve with increased flow range

Details Flow control valve with increased flow range Flow control valve with increased flow range

1997-10-22

1999-03-02

Hepperle, Stephen M.

Fluid handling

Processes

With control of flow by a condition or characteristic of a...

137502, 137613, G05D 701

Patent

active

058758062

ABSTRACT:
A fluid metering system comprises a source of pressurized fluid, a proportional metering valve and a delta-p regulator, which maintains a constant pressure drop across the proportional metering valve. The delta-p regulator is referenced to the static pressure upstream of the metering valve and the stagnation pressure downstream of the metering valve. By referencing the stagnation pressure downstream of the metering valve, the effective static pressure across the metering valve increases as a function of fluid flow rate and therefore provides an increased flow range and corresponding turndown ratio for any given proportional metering valve.

REFERENCES:
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patent: 4862912 (1989-09-01), Stoll
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patent: 4991392 (1991-02-01), Goldberg et al.
patent: 5368273 (1994-11-01), Dante

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