Fluid handling – Convertible – Reversible check
Patent
1996-04-26
1998-07-14
Michalsky, Gerald A.
Fluid handling
Convertible
Reversible check
60443, 13762564, 417213, F15B 1302
Patent
active
057789240
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a hydraulic control valve block in a standard configuration having a first control valve and second control valve which functionally cooperates with the first control valve and is connected therewith through the intermediary of pressure medium channels. The valve block has a valve piston which, on the one hand, is controlled by a hydraulic pressure reigning in a pressure chamber, and on the other hand, is acted upon by a spring-pressure part.
In practice, such a hydraulic control valve block is known in a standard configuration which is economically manufactured in large numbers and for example serves for the regulation of flow and pressure of hydrostatic machines, such as for example axial piston pumps of hydraulic drives for fans of cooling equipment of internal combustion engines. Both control valves of this known control valve block are formed as piston valves with hydraulic control, whereby the first control valve is controlled via two control pressure channels having two different control pressures, which yield a pressure difference proportional to the displacement volume flow of the axial piston pump, and the second control valve is controlled with a control pressure proportional to the working pressure of the axial piston pump; the control being effected in each case against the pressure of a spring pressure part. In order to be able to vary the characteristic of the first control valve remotely there is connected to its control pressure channel having the lower control pressure an external, electrically controlled pressure valve of seat valve construction, by way of a control line, which involves additional constructional and installation effort.
It is the object of the invention to further develop a control valve block of the kind mentioned above such that, whilst maintaining its functions, with the employment of the remotely controllable seat valve, the constructional and installation effort is reduced. The known control valve block is modified in accordance with the invention through exchange of the spring pressure part of its second control valve with the seat valve and the deactivation of the valve piston of the second control valve. At the same time, one of the two hydraulic connections of the seat valve, preferably its outlet, is connected to a hydraulic connection already present, preferably a tank connection of the control valve block, and the other hydraulic connection of the seat valve, preferably its inlet, is connected to the pressure medium channel additionally formed in the control valve block, which pressure medium channel preferably opens into the control channel of the first control valve having the lower control pressure. With a fully closed seat valve, the first control valve retains its function, thus working for example as a pressure difference valve, the control of which with the differential pressure can, through opening of the seat valve, be purposively varied corresponding to the relief of the lower of the two control pressures which yield the differential pressure. As soon as the lower control pressure is reduced to zero, the first control valve functions as pressure valve; it can consequently with the aid of the seat valve be employed both for flow regulation and also for pressure regulation. The control of the seat valve may be effected arbitrarily or in accordance with the field of application of the control valve block in dependence upon various parameters, such as for example the speed of rotation of a drive motor for the pump, the working pressure of the same, with the employment of a corresponding pressure/flow transducer, or the temperature of the cooling medium in the case of employment in a hydraulic drive for a fan of the cooling device of an internal combustion engine. A control valve block modified and formed in this way has, with significantly lesser construction and installation effort as a consequence of the omission of the external, electrically controlled seat valve, as a result of the use of the same instead of the second contr
REFERENCES:
patent: 4699571 (1987-10-01), Bartholomaus
patent: 4960365 (1990-10-01), Horiuchi
Beutler Gerhard
Stangl Helmut
Brueninghaus Hydramatic GmbH
Michalsky Gerald A.
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