Control valve

Details Control valve Control valve

1980-07-31

1981-12-01

Weakley, Harold W.

Automatic temperature and humidity regulation

Thermostatic

With pressure control

236 93R, 236 99J, 137 73, 137468, 137491, G05D 2700

Patent

active

043031978

ABSTRACT:
The control valve for keeping constant viscosity and temperature of a pressure medium in a hydraulic circuit includes a preliminary control valve which supports a temperature sensitive control element and adjustable throttling means including a throttling plunger controlled by the control element; a control slider arranged in the valve upstream of the preliminary control valve is provided with first throttling means for admitting pressure medium against the preliminary control valve to establish a bypass connection in addition to the main connection controlled by the slider; to avoid excessive temperature increase of the medium in the case of a damage of the control element, a temperature sensitive shearing pin is provided between the control element and the throttling plunger to cause an override of the plunger to a position in which an additional bypass connection is established which prevents throttling and thus temperature increase of the pressure medium.

REFERENCES:
patent: 1848031 (1932-03-01), Spencer
patent: 2401144 (1946-05-01), Dube
patent: 2820473 (1958-01-01), Reiners
patent: 3401605 (1968-09-01), Born
patent: 3498537 (1970-03-01), Wong

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