Fluid flow controller

Details Fluid flow controller Fluid flow controller

2006-10-03

2009-12-01

Lee, Kevin L (Department: 3753)

Fluid handling

Systems

Flow path with serial valves and/or closures

C137S505000, C374S028000

Reexamination Certificate

active

07624758

ABSTRACT:
A fluid flow controller (1) comprises a variable aperture flow control valve (5) having an inlet to receive fluid from a supply source and an outlet to deliver fluid along a conduit (6). Downstream of the valve (5) is a back-pressure regulator (8), which in turn delivers fluid to an outlet (9), whilst a permanently open orifice (11) is connected to the conduit (6) upstream of the regulator and provided with an exhaust outlet (12), the characteristics of the valve (5), regulator (8) and orifice (11) being so selected that upon a slight opening of the valve (5), the regulator (8) maintains a closed condition, while further opening of the valve (5) raises the fluid pressure at the regulator (8) which commences opening, to provide a continuous exhaust flow at the exhaust outlet (12), to extend the satisfactory operating range of the flow control valve (5) down to very low flow rates. The controller (1) is suitable for use with a sulphuric acid dewpoint monitor.

REFERENCES:
patent: 3958599 (1976-05-01), Sheldon et al.
patent: 4179917 (1979-12-01), Sheldon et al.
patent: 6071481 (2000-06-01), Mathews et al.
patent: 6422257 (2002-07-01), Baker, Jr.
patent: 0 551 594 (1993-07-01), None
patent: 0 584 920 (1994-03-01), None
patent: 03/071265 (2003-08-01), None
Search Report dated Jan. 24, 2007 which issued in connection with corresponding European Application No. 06076795.1.

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