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DDC-JQ electromagnetic vacuum charge valve the special valve install in machine vacuum pump, used same electrical source with pump, pump operate or stop control valve open or close directly. When pump stopping or cut of electrical source suddenly, valve will close vacuum system automatic, use valve charge caliber pass though the valve cavity to pump cavity, prevent pump oil return to protect vacuum system. The medium is air or non-corrosive gas.http://www.winning-china.com
