Fluid handling – Self-proportioning or correlating systems – Self-controlled branched flow systems
Patent
1992-07-30
1993-10-26
Nilson, Robert G.
Fluid handling
Self-proportioning or correlating systems
Self-controlled branched flow systems
G05D 1610
Patent
active
052557014
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a hydraulic pressure regulator comprising a control piston disposed in a regulator housing between an inlet pressure chamber and an outlet pressure chamber for a hydraulic medium.
Hydraulic pressure regulators are used primarily to convert fluctuating inlet pressures into a constant outlet pressure. The areas of use in that respect are for example the application of liquid adhesives in the packaging industry or the application of paint or other coating agents. When the medium ceases to be taken off at the outlet pressure chamber, when therefore for example the application of glue or the application of paint is terminated or interrupted by the operator, the outlet pressure last occurring fully obtains in the outlet pressure chamber. That gives rise to various disadvantages:
If for example closure of the applicator nozzle which is usually connected to the outlet pressure chamber for the application of paint, glue or the like is not completely sealing, medium issues from the nozzle in an uncontrolled fashion as a result of the pressure in the outlet pressure chamber. Furthermore there are agents which react in an undesirable manner under the influence of pressure. Thus it may happen for example that, with many glues, undesirable hardening occurs as a result of the pressure which obtains in the outlet pressure chamber and in the system connected thereto, to and including the injection nozzle. In the case of so-called plastisols, the situation may involve for example a separation-out phenomenon, that is to say the previously homogeneous mixture of substances is separated into individual components and can no longer be used in that condition.
Another disadvantage is that, with a pressure obtaining in the outlet pressure chamber and the system connected thereto, it is not possible to carry out any maintenance operations or repairs as otherwise the outlet pressure obtaining could possibly result in the medium being abruptly discharged in an uncontrolled fashion.
The invention is based on the object of so designing a hydraulic pressure regulator of the kind set forth in the opening part of this specification that, when the medium ceases to be taken off from the outlet pressure chamber, the pressure in the outlet pressure chamber can be reduced as desired and - if desired - can be reduced to zero. In that respect, the invention seeks to take account of the requirements which occur in a practical context, whereby for example there is no need to provide for pressure relief in the event of a short-term cessation in the medium being taken off, as in that case the above-discussed adverse consequences normally do not occur, but that when for example the medium is to cease to be taken off for a longer period of time, the desired reduction in pressure or complete elimination of pressure is or can be effected.
There are no pressure regulators which, with a relatively constant inlet pressure, permit stepless pressure regulation with automatic self-relief. The design of known hydraulic pressure regulators of the kind set forth in the opening part of this specification is highly expensive and complicated. For that reason the known pressure regulators are relatively heavily dependent on repair and expensive to manufacture. A further part of the object of the present invention is that of proposing a hydraulic pressure regulator of the kind set forth in the opening part of this specification, which is of a simple structure and therefore robust, inexpensive to manufacture and maintenance-friendly but which at the same time has an advantageous regulation characteristic.
In accordance with the invention those objects are attained in that the control piston is adapted to be doubly acted upon and the inlet pressure of the hydraulic medium to be regulated acts on the control piston on the one side and a resilient control pressure force acts on the control piston on the other side and that the control piston, on its side towards the inlet pressure, has a smaller piston surface which is provided on a lower project
REFERENCES:
patent: 1361636 (1920-12-01), Stage
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