G - Physics
05
D
137/34
G05D 27/00 (2006.01) G05D 23/02 (2006.01) G05D 24/00 (2006.01)
Patent
CA 1173721
ABSTRACT OF THE DISCLOSURE A control valve for maintaining the temperature respectively the viscosity of pressure fluid passing there- through substantially constant comprises a control slide pro- vided with a throttle bore and downstream of the control slide a precontrol valve in which an end portion of an element expandable by the temperature of the pressure fluid is arranged. When pressure fluid with a certain pressure is fed through the inlet end of the control valve, the control slide is lifted from its seat and the precontrol valve opens. All of the pres- sure fluid entering the control valve is passed through vari- ous bores and annular gaps along the precontrol valve to the temperature expandable element. When the fluid reaches the desired maximum temperature a bypass for the fluid is created by the expandable element and a control pin actuated by the latter. thereby the throttle action of the control valve is reduced and overheating of the pressure fluid avoided. A throttle gap between the control slide and the housing will assure removal of any air contained in the pressure fluid and a further throttle gap formed between an end face of the con- trol slide and a disc attached thereto serves to catch any foreign particles in the pressure fluid which will be flushed away after moving of the control slide away from its seat.
397461
Reick Georg
Zirps Wilhelm
Bosch Robert G.m.b.h.
Fetherstonhaugh & Co.
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