Add: Mechanical&Electrical Industry Zone,Yuhuan,Zhejiang,China
There are two types of normally closed and normally open. Normally closed when the power is off when the state, when the coil power generated when the electromagnetic force, Solenoid so that the core to overcome the spring force with the static iron core pull directly open the valve, the medium was channel; when the coil power loss when the electromagnetic force disappeared, moving iron The core under the action of the spring force to reset, directly close the valve port, the media barrier. Simple structure, reliable action, Solenoid in the zero pressure and micro vacuum under normal work. Normally open the opposite.
Normally closed when the power, the electromagnetic coil to produce electromagnetic force from the valve seat lift, the valve open; power, the electromagnetic force disappears, Solenoid the spring to open the pressure on the valve seat, the valve open.
When the coil is energized, the electromagnetic force is generated so that the moving core and the static core are sucked and the pilot port is opened and the valve port is arranged on the main valve port, and the moving core is connected with the main spool, The pressure of the chamber through the valve port unloading, in the pressure difference and electromagnetic force at the same time under the action of the main spool up movement, Solenoid open the main valve medium circulation. When the coil power failure when the electromagnetic force disappears, then move the core in the role of self-weight and spring force to close the valve hole, then the media in the balance hole into the main spool cavity, so that the upper chamber pressure, In the spring return and pressure under the effect of closing the main valve, Solenoid the media flow. Reasonable structure, reliable action, work in the zero pressure is also reliable. Such as: ZQDF, ZS, 2W and so on.
It is a combination of direct and pilot type, when the inlet and outlet are not pressure, the power, the electromagnetic force directly to the pilot valve and the main valve closing parts in turn lift up, Solenoid the valve open. When the inlet and outlet to start the pressure difference, the power, the electromagnetic force pilot small valve, the main valve chamber pressure rise, the upper chamber pressure drop, Solenoid so the use of pressure to push the main valve up; power, the pilot valve using spring Force or medium pressure to push the closing member, move down to close the valve.
Normally closed when it is not energized. Solenoid When the coil is energized, the generated magnetic force causes the moving core and the static core to suck, the pilot port opens and the medium flows to the outlet. At this time, the pressure in the upper chamber of the main spool is reduced, which is lower than the pressure on the inlet side, Resistance and then move up to achieve the purpose of opening the main valve port, Solenoid the media circulation. When the coil is powered off, the magnetic force disappears and the moving core is reset to close the pilot port under the action of the spring force. At this time, the medium flows from the balance hole, the upper cavity pressure increases, and moves downward under the action of the spring force, Close the main valve port.Solenoid The principle of normally open is just the opposite.
At the time of energization, the electromagnetic force opens the pilot hole, the upper chamber pressure drops rapidly, the upper and lower pressure difference is formed around the open part, Solenoid the fluid pressure drives the opening part to move upwards, the valve opens; when the power is turned on, the spring force opens the pilot hole , Solenoid The inlet pressure through the bypass hole quickly chamber in the closing valve around the formation of low pressure on the lower, the fluid pressure to push the open parts down to open the valve.