What kind of solenoid pneumatic valve selection methods are there

low fluid pipeline must be electromagnetic pneumatic valve series models in the calibration and use of medium.
low electromagnetic air valve is used in the fluid temperature must be smaller than the calibration of temperature.
low electromagnetic pneumatic valve to allow the liquid viscosity, generally under CST, greater than the CST should be marked.
low working pressure difference, line the high pressure difference is less than. Should be chosen as ZS MPa, W, ZQDF, ZCM series straight acting; Differential pressure is greater than the minimum work. The MPa guiding type (optional Differential pressure type) Solenoid pneumatic valve; Maximum working pressure difference should be less than the biggest calibration pressure solenoid pneumatic valve; General electromagnetic pneumatic valve is unidirectional, so should pay attention to whether there is a pressure difference, if you have installed check pneumatic valve.
low fluid cleanliness is not high when the filters should be installed in front of the solenoid pneumatic valve, general cleanliness requirements for medium pneumatic valve is better.
low flow aperture and take over diameter; Two solenoid pneumatic valve usually only switch control; Conditions permit, please install bypass pipe, easy maintenance; When there is water hammer to customize solenoid pneumatic valve opening and closing time to adjust.
low pay attention to the influence of environment temperature on electromagnetic pneumatic valve.
low power supply current and power consumption should be selected according to the output capacity, power supply voltage generally + % to the left or right, must pay attention to communication when starting the VA value is higher.

reliability low electromagnetic pneumatic valve normally open and normally closed; General selection normally closed type, electric open, power is shut down; But in the open for a long time close to choose the normally open type.
low life test, the factory generally belongs to the type testing project, said the people haven't exactly professional standards of electromagnetic pneumatic valve, so careful when choosing solenoid pneumatic valve manufacturer.
short action time of the low frequency high generally choose straight acting, large-caliber choose fast series.

security general solenoid pneumatic valve is not waterproof, when conditions are not allowed to use waterproof model, the factory can be customized.
low electromagnetic pneumatic valve the highest calibration of nominal pressure must exceed the highest pressure in the pipeline, otherwise life will shorten or other unexpected circumstances.
low corrosive liquid should be chosen in all stainless steel type, appropriate chooses the corrosive fluid plastic king ( SLF) Solenoid pneumatic valve.
low explosive environment must choose corresponding explosion-proof products. Economy

there are a lot of solenoid pneumatic valve by gm, but are able to meet the above three points should be chosen on the basis of most economic products.
2, the structure and principles of electromagnetic pneumatic valve

direct acting solenoid pneumatic valve is normally closed type and open type two kinds. Normally closed type power outages are closed, when the coil electricity to produce electromagnetic force, the moving core to overcome the spring force with the static iron core and directly open the pneumatic valve, medium is access; When power coil electromagnetic force disappears, under the action of spring force of moving iron core reset, close the pneumatic valve directly, medium. Simple structure, reliable action, under the zero pressure difference and micro vacuum to work normally. Normally open type is just the opposite. If less than phi solenoid pneumatic valve flow path.
step-by-step direct acting solenoid pneumatic valve
the pneumatic valve adopts open a pneumatic valve and the second opening in an organic whole repeatedly pneumatic valve, pneumatic valve and pneumatic valve guide step by step to make electromagnetic force and differential pressure directly open the pneumatic valve port. When energized coil, thus moving iron core and static iron core and electromagnetic force, pneumatic valve mouth open and guidance pneumatic valve, pneumatic valve port is located in the Lord and moving iron core together with the main pneumatic valve core, the main pneumatic valve cavity pressure through the guide of pneumatic valve port unloading, under the action of pressure difference and the electromagnetic force at the same time make the pneumatic valve core upward movement, pneumatic valve to open the main medium of circulation. Disappear when the power coil electromagnetic force, the dynamic core in gravity and spring return pneumatic valve, and pressure under the action of closing the main medium. Reasonable structure, reliable operation, work is reliable when zero pressure difference, when the zero pressure difference work is reliable. Such as: ZQDF, ZS, W.

the indirect guiding type solenoid pneumatic valve series solenoid pneumatic valve by the pilot is linked to the pneumatic valve and main valve core forming channel combination; Normally closed type in an unpowered, is closed. The competing power, when the winding of magnetic force makes the moving iron core and static iron core, guide pneumatic valve open mouth, medium of exports, reduce the cavity pressure as the main pneumatic valve core, below the inlet side of the pressure, formation pressure difference to overcome the spring resistance and then upward movement, achieve the goal of open the pneumatic valve mouth, medium circulation. Disappear when coil electricity, magnetism, moving iron core under the action of spring force downward movement, shut down the main pneumatic valve port. Often open principle is just the opposite. Such as: the SLA, DF ( Phi above diameter) , ZCZ etc.