Introduction to step-by-step direct-acting solenoid valves:
This kind of valve adopts the primary opening valve and the secondary opening valve connected in one, the main valve and the pilot valve step by step to make the electromagnetic force and the pressure difference to open the main valve port directly.
1. When the coil is energized, the electromagnetic force generated by the moving iron core and static iron core suction, the pilot valve port open and the pilot valve port is located in the main valve port, and the moving iron core and the main valve spool connected together, at this time, the main valve cavity pressure through the pilot valve port unloading, in the pressure difference and the simultaneous action of the electromagnetic force to make the main valve spool upward movement to open the main valve media flow.
2. When the coil is disconnected when the electromagnetic force disappears, this time the moving iron core in the self-weight and spring force under the action of closing the pilot valve hole, at this time the medium in the balance of the hole into the main valve spool cavity, so that the upper cavity pressure rises, at this time in the spring reset and the pressure of the action of closing the main valve, the media flow.
Step-by-step direct-acting solenoid valve structure is reasonable, reliable action, in zero differential pressure work is also reliable. Such as: ZQDF, ZS, 2W and so on.
Principle of step-by-step direct-acting solenoid valve:
It is a combination of direct-acting and pilot-operated principle.
1. When there is no pressure difference between the inlet and outlet, after energizing, the electromagnetic force directly lifts the pilot small valve and the main valve closing member upward in sequence, and the valve opens.
2. When the inlet and outlet to start the pressure difference, after energizing, electromagnetic force pilot small valve, the main valve lower chamber pressure rises, the upper chamber pressure drops, thus using the pressure difference to push the main valve upward.
3. When the power is off, the pilot valve using spring force or medium pressure to push the closing member, downward movement, so that the valve is closed.
Step-by-step direct-acting solenoid valve features:
In zero differential pressure or vacuum, high pressure can also be action, but the power is larger, the requirement must be installed horizontally.
