Explosion-proof solenoid is introduced and the working principle of pneumatic valve

explosion-proof solenoid pneumatic valve is all the devices may be lit with explosive gas mixture components enclosed in a shell, the shell can withstand any shell joint surface or structure clearance, infiltrate into the inside of the shell of combustible mixture in the internal explosion damaged, and not caused by outside a gas or vapor formation of explosive environment, a variety of light, the temperature may produce a spark, arc and dangerous parts are in the explosion-proof enclosure, explosion-proof enclosure equipment internal space and the surrounding environment. Explosion-proof enclosure there is gap, for electrical equipment for respiration and gas osmosis, make internal possible explosive gas mixture.
solenoid pneumatic valve has closed cavity, in a different location to open a hole, each hole leads to different tubing, cavity pneumatic valve is among, both sides are two electromagnets, which face the magnet coil electricity pneumatic valve will be attracted to which side, by controlling the movement of the pneumatic valve body to blocked or leakage of different discharge of oil hole, and the oil hole is always open, hydraulic fluid will enter the different oil drain, and then through the oil pressure to push the cylinder piston, piston drives the piston rod, piston rod drive mechanism. So that by controlling the electric current of the electromagnet to control the mechanical movement.
working principle is:
) 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.
) Distribution of 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 closure, 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.
) Guiding type solenoid pneumatic valve:
principle: electricity, electromagnetic force open the pilot hole, the chamber pressure drops rapidly, in closed form around the high low 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.
features: high fluid pressure range limit, can be arbitrary installation ( Need to customize) But fluid differential pressure conditions must be met.

difference between electromagnetic pneumatic valve from the pneumatic valve structure and material of different and the difference on the principle, is divided into six branches small classes: diaphragm structure, step by step of moving heavy piece of membrane structure, the structure, the forerunner in straight moving piston structure, step by step piston structure, the forerunner of moving piston structure.