| 摘要 |
The system is e.g. for a domestic or industrial water, gas or oil distribution apparatus. It consists of a circuit with at least one electrically operated valve (EV1,EV2) and two pressure regulators (P1,P2) for high- and low-pressure respectively, both situated after the first valve (EV1) in the direction of the fluid flow. The high-pressure regulator is set to a first pressure which is slightly below that of the feed network, while the low-pressure regulator is regulated to a second pressure below that of the first. The pressure regulator contacts and the valve coils are connected to a logical electrical circuit with a control unit to open the first valve if the pressure after it drops sharply and close it if the pressure lies between the set pressures of the two pressure regulators.
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