| 摘要 |
PROBLEM TO BE SOLVED: To provide a pressure-inclusion type pressure switch in which the occurrence of a hunting phenomenon can be prevented by making it possible to hold an inclusion pressure between an ejection port of a pump and a valve for a long time. SOLUTION: The pressure switch 10 includes: a diaphragm 15 as a pressure detecting means S which is installed at a flow passage between the ejection port of the pump 41 and the valve 6 and detects pressure changes in the flow passage based on opening/closing of the valve; a piston 16; and a helical compression spring 36 or the like. Moreover, the pressure switch 10 includes a micro switch 17 as a control means to control operation of the pump based on detection of pressure changes of the pressure detecting means. Furthermore, the pressure switch 10 includes a check valve which is installed at the flow passage between the ejection port of the pump and the pressure detecting means, and prevents a liquid from flowing in a direction opposite to ejection direction of the liquid by the pump. COPYRIGHT: (C)2011,JPO&INPIT
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