Flow control valve with stable modulation

Details Flow control valve with stable modulation Flow control valve with stable modulation

1990-07-19

1991-10-22

Hepperle, Stephen M.

Fluid handling

Systems

Multiple inlet with single outlet

13761414, 251 3004, F16K 1124

Patent

active

050586246

ABSTRACT:
A pilot operated flow modulating control valve with a pilot valve to incrementally control the position of the control valve and flow. The control valve has a closure valve for blocking flow through the valve and an oppositely acting but integral modulating valve that modulates flow through the control valve. An electromagnetic coil driven actuator has a pilot seal that modulates flow through a pilot passage in the control valve to effect following movement of the control valve. A relatively low voltage through the coil positions the control valve in its maximum flow position and a relatively high voltage through the coil moves the control valve in its modulating positions, minimizing inadvertent control valve instability from transient voltages or pressures when the valve is modulating.

REFERENCES:
patent: 2833304 (1958-05-01), Fish
patent: 2899972 (1959-08-01), Matthews
patent: 3011751 (1961-12-01), Delany et al.
patent: 3185172 (1965-05-01), Hajek
patent: 3476147 (1969-11-01), Hitt et al.
patent: 3655163 (1972-04-01), Rattan et al.
patent: 3672627 (1972-06-01), McCarty et al.
patent: 4863098 (1989-09-01), Kolze

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