Control valve
AssigneeRobert Bosch GmbH
InventorWilhelm Zirps
Life of this patent
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Abstract
The control valve for keeping a constant temperature or viscosity of a pressure medium in a hydraulic consumer circuit includes a main control valve provided with a control slider and a preliminary control valve in which a temperature sensitive control element is arranged in such a manner that upon reaching a predetermined temperature of the medium a bypass channel is established between the inlet and the outlet of the valve.
Claims9
A control valve for keeping constant viscosity or temperature of a pressure medium in a hydraulic circuit, comprising a valve housing defining an inlet and an outlet for the pressure medium;
- a control slider arranged for reciprocating movement in said housing and including means for throttling said medium;
- a preliminary control valve arranged in said housing downstream of said throttling means in said control slider and including a temperature sensitive control element made of a thermally extendable material which controls said additional throttling means, said preliminary control valve including a poppet and a valve seat, said poppet being controlled through said temperature sensitive control element and being spring biased against said valve seat, said poppet being formed with a blind bore defining a shoulder at its open end and said control element being seated on said shoulder.
A control valve for keeping constant viscosity or temperature of a pressure medium in a hydraulic circuit, comprising a valve housing defining an inlet and an outlet for the pressure medium;
- a control slider arranged for reciprocating movement in said housing and including means for throttling said medium so as to provide temperature increase of the latter;
- a preliminary control valve arranged in said housing downstream of said throttling means in said control slider;
- and including a temperature sensitive control element arranged in said preliminary control valve;
- and additional throttling means bypassing said preliminary control valve and cooperating with said temperature sensitive control element to regulate the amount of the bypassed pressure medium as a function of the temperature of the latter, said temperature sensitive control element being arranged to allow the bypassing only when a predetermined temperature is reached.
Dependencies are inferred from the claim text.