Control valve for fluid-operated clutch

Details Control valve for fluid-operated clutch Control valve for fluid-operated clutch

1980-02-07

1981-08-11

Tapolcai, Jr., William E.

Automatic temperature and humidity regulation

Motors

Fluid-operated

123 4112, 13762569, 236100, G05D 2312

Patent

active

042830095

ABSTRACT:
A control valve is provided for a fluid-operated clutch. Specifically, the control valve controls fluid to the fluid-operated clutch of a vehicle cooling fan. The control valve disengages the clutch to disconnect the fan from an internal combustion engine of the vehicle when coolant temperature is low and engages the clutch to operate the fan when the coolant temperature rises to a predetermined value. The control valve has a central passage with three bores and a valve spool with three sealing members associated with the bores. Fluid is supplied under pressure to the valve and always acts in opposite directions on two of the sealing members to provide a balanced condition for the valve spool even with fluctuations in the inlet pressure of the fluid. The control valve utilizes a temperature-responsive device to move the valve spool, with the device being readily adjustable to achieve operation at desired coolant temperatures.

REFERENCES:
patent: 2656144 (1953-10-01), Frantz
patent: 2854998 (1958-10-01), Mac Glashan, Jr. et al.
patent: 3951166 (1976-04-01), Whitener
patent: 3955760 (1976-05-01), Ridenour et al.
patent: 3961606 (1976-06-01), Wong
patent: 4065052 (1977-12-01), Ridenour
patent: 4128203 (1978-12-01), Maltby
patent: 4165035 (1979-08-01), Maltby
patent: 4176784 (1979-12-01), Ridenour

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