What is the kinds of electromagnetic pneumatic valve solenoid pneumatic valve have?

solenoid pneumatic valve is what? Electromagnetic electromagnetic control of industrial equipment, pneumatic valve is used in the industrial control system, is used to adjust the direction of the medium, flow, velocity and other parameters. Electromagnetic pneumatic valve is used to control the electromagnetic effect, the main control mode is controlled by relay. So, solenoid pneumatic valve can cooperate with different circuit to achieve the desired control, and the precision of the control and flexibility to be able to guarantee. Solenoid pneumatic valve has a lot of kinds, different electromagnetic pneumatic valve in different position of the control system, the most commonly used is a one-way pneumatic valve, safety valve, directional control pneumatic valve, speed regulation valve, etc. Solenoid pneumatic valve in principle can be divided into three categories:
direct acting solenoid pneumatic valve:
principle: electricity, electromagnetic coil to produce electromagnetic force to shut off pneumatic seat, pneumatic valve open; Power, the electromagnetic force disappears, press on the pneumatic valve seat, spring to close the pneumatic valve is closed.
characteristics: in a vacuum, negative pressure, can work properly when the zero pressure, but size is generally not more than the mm.
step-by-step direct acting solenoid pneumatic valve:
principle: it is a direct acting and pilot operated the principle of combining, when the inlet and outlet no pressure difference, after electrify, electromagnetic force the lead directly to the small pneumatic valve and main valve closed, in turn, lift, pneumatic valve to open. When the inlet and outlet at startup pressure difference, after electrify, forerunner of the electromagnetic force small pneumatic valve, the main pneumatic valve inferior vena pressure rising, the cavity pressure drop, which using the differential the main pneumatic valve opened up; Power outages, the forerunner of pneumatic valve using the spring force or medium pressure push off, move down, to close the pneumatic valve.
features: on the zero differential pressure or vacuum and high pressure, to * action, but power is larger, requirements must be installed level.
the guide type solenoid pneumatic valve:
principle: electricity, electromagnetic force open the pilot hole, the chamber pressure drops rapidly, closed
in a closed form around low high differential pressure, fluid pressure push close up, pneumatic valve open; Power off, the spring force to close the guide hole, inlet pressure chamber through the bypass hole quickly shut in pneumatic valve using a form around on high pressure difference, fluid pressure push close move down, close the pneumatic valve.