System for controlling flow through a process region

Details System for controlling flow through a process region System for controlling flow through a process region

1995-06-07

1996-12-10

Hepperle, Stephen M.

Fluid handling

Line condition change responsive valves

With separate connected fluid reactor surface

137907, G05D 700

Patent

active

055822037

ABSTRACT:
A regulator for maintaining a constant partial vacuum in a region, such as in a piece of process equipment or a fume hood. The regulator includes a path, through which fluid passes from the region to the vacuum source, and a movably mounted piston having a frontal face, which is exposed to fluid in the path, and a distal face, which is exposed to a reference pressure, such as the pressure of the environment in which the equipment is located. The piston is disposed in the path so that the piston may constrict the path at a constriction point. Fluid in the path upstream of the constriction point exerts a pressure on the frontal face of the piston that tends widen the path at the constriction point. The piston is mounted so that the weight of the piston exerts a force on the piston in a direction that tends to widen the path at the constriction point. A force is exerted on the piston, preferably by a spring under compression, in a direction that tends to narrow the path at the constriction point.

REFERENCES:
patent: 2888948 (1959-06-01), Pellmyr et al.
patent: 3502100 (1970-03-01), Jonson
patent: 3853143 (1974-12-01), De Lepeleire
patent: 3978883 (1976-09-01), Petersen
patent: 4739924 (1988-04-01), Kelley
patent: 5251654 (1993-09-01), Palmer

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