Working Principle：
ZQDF model series solenoid valve is step-by-step direct action solenoid valve, which can operate according to the electric signals generated by the hand switch, pressure relay, temperature controller and other controlling equipment. When the winding is switched on it attracts the armature and lead the small valve to open the accessory valve orifice and reduce the pressure in the upper part, and the big valve is opened under the action of the generated medium pressure difference and electromagnetic force; the armature is reset by the spring force when the winding is switched off, and the small and big valves are tightly closed by the medium pressure.

　　Note: There are stainless solenoid valve of the above specifications available,which is numbered as ZQDF-口B
Flange Connection Solenoid, No.: ZQDF-口F