EMCF series electro-magnetic valve(also called diaphragm valve) is one type of pulse valve. The valve is “switch” for compressed air in the dust clean blowing system of the pulse bag filter. Controlled by the output signals of the pulse jet control device, EMCF valve makes dust clean to the filter bags cell by cell to keep the resistance of the baghouse within the set range, and thus guarantee the processing functions and the dust-collecting efficiency of the baghouse.