The working principle of the steam solenoid valve.

1. The steam solenoid valve is the direct pilot type solenoid valve for the step action, which can be divided into the normal closed solenoid valve and the normally open solenoid valve according to the difference of the opening and closing state when the power is off.

2. The steam solenoid valves, normally closed steam coil after electrify, armature vice valve under the effect of electromagnetic force to drive the valve plug, fluid by the deputy valve on the main valve cup run, reducing the role, the pressure of the main valve cup when the main valve cup pressure was reduced to a certain value, the armature drives the main valve cup, and by using pressure difference and make the main valve cup opening, medium circulation. When the coil is out of power, the electromagnetic force disappears, and the armature is reset due to gravity. At the same time, depending on medium pressure, the main auxiliary valve can be closed tightly.

3. Normally open steam solenoid valves, steam coil electricity due to the suction effect, after moving iron core down, the deputy valve plug pressure, the deputy valve closed, pressure rise within the main valve cup, when the pressure rises to a certain value, the main valve cup of fluctuation pressure difference, due to the electromagnetic effect, moving iron core loss of the main valve cup, the pressure the main valve seat, the valve closed. When the coil is out of power, the electromagnetic suction is zero, the auxiliary valve plug and the iron core are lifted by the spring, the auxiliary valve is opened, the main valve cup is pushed up by the pressure difference, the main valve is opened and the medium is in circulation.