| 摘要 |
A hydroelectric pressure switch having a housing in which a piston, to which pressure is applied, is supported such that it can move in a reciprocating manner in order to operate an electrical switch, and rests on switching means at its end to which the pressure medium is not applied, which switching means are prestressed against the piston in a manner which can be adjusted by means of a spring having a force corresponding to a lower pressure value, to be precise by means of adjusting means which can be set - preferably which can be screwed in - in the housing and are used as an opposing support for the spring, characterised in that, when the lower pressure value which is set by means of the spring is reached by the pressure medium, a changeover in the electrical switch does not take place immediately but the displacement of the switching means, which are preferably constructed as a guide bush, by the piston does not cause the changeover of the electrical switch until a movement of the switching means which is likewise preset and corresponds to an upper pressure value has been moved through.
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