Flow rate control unit

Details Flow rate control unit Flow rate control unit

1991-07-17

1993-04-27

Hepperle, Stephen M.

Fluid handling

Line condition change responsive valves

With separate connected fluid reactor surface

251368, F16K 1732, F16K 2700

Patent

active

052053202

ABSTRACT:
A flow rate control unit equipped with inner and outer dual cylinders in the housing of the unit, wherein the inner cylinder is normally urged by an elastic member to change the position of the upper section of the inner cylinder depending upon the balance between the above elastic force and the pressure of the fluid supplied in the housing so that the flow rate of the fluid to be discharged from the outlet of the housing can be controlled accordingly, characterized in that the outer and inner cylinders are made of ceramics to eliminate corrosion due to contact with fluid, and that the relationship between the average surface roughness of the inner circumferential surface of the outer cylinder and the average surface roughness of the outer circumferential surface of the inner cylinder is set within a range satisfying a formula to accurately discharge fluid at a constant flow rate.

REFERENCES:
patent: 2917075 (1959-12-01), Terry
patent: 4147177 (1979-04-01), Iwatsuki
patent: 4648424 (1987-03-01), Takahashi et al.
patent: 4801265 (1989-01-01), Kratochwilla
patent: 4847166 (1989-07-01), Kaido et al.
patent: 4856758 (1989-08-01), Knapp

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