Changeover valve and flow control valve assembly having the same

Details Changeover valve and flow control valve assembly having the same Changeover valve and flow control valve assembly having the same

1994-05-26

1996-03-05

Nilson, Robert G.

Fluid handling

Line condition change responsive valves

With separate connected fluid reactor surface

137501, G05D 701

Patent

active

054958695

ABSTRACT:
A flow control valve assembly has a high degree of liquid-tightness and good flow controllability, even if a high-pressure, low-viscosity fluid is used. A housing of the valve assembly is formed with an inlet port and an outlet port, and a spool inserted in the housing. First and second fluid chambers for applying fluid pressures on both ends of the spool communicate with each other through a fluid passage having an orifice. The opening of the valve portion is adjusted by the movement of the spool so that the spool driving force produced by the difference in the pressures applied to both ends of the spool balances with a biasing force, whereby a fluid flows through the orifice at a controlled rate. This control valve assembly has an elastic annular seal. When the spool moves toward the annular seal, the land portion on the spool outer periphery is adapted to butt the seal, thereby closing the fluid passage. In this closed state, fluid leakage is reduced substantially to zero. Also, it is possible to control the fluid flow even while the flow rate is very low.

REFERENCES:
patent: 2633147 (1953-03-01), Badami
patent: 2912001 (1959-11-01), Green
patent: 2994343 (1961-08-01), Banks
patent: 3770008 (1973-11-01), Turney
patent: 5109886 (1992-05-01), Takata
patent: 5201490 (1993-04-01), Maraud

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