Solenoid pneumatic valve function and working principle of the profile

solenoid pneumatic valve because of its high intelligent degree, easy operation, are widely used in many industries, it is used to do? The working principle and how?
a, function and application of
solenoid pneumatic valve is a kind of rely on the electromagnetic switch automatically by the pneumatic valve. In refrigeration and air conditioning device, commonly used pneumatic valve as a remote control by the pneumatic valve, electromagnetic on-off control system of the regulating authority or safety protection equipment. It can be applied to all kinds of gas, liquid refrigerant, lubricating oil and other media.
for some of the early, the small and medium-sized units series pneumatic valve in front of the throttle device of liquid on the tube, and the same start switch connected to the compressor.
when the compressor boot, solenoid pneumatic valve to open, turn on the system line, the normal operation of the air conditioning system. When the compressor stop, solenoid pneumatic valve automatically cut off the liquid line, stop the refrigerant liquid to flow to the evaporator, prevent refrigerant liquid collision was caused when the compressor starts up again.
in the central air conditioning, Many online) System, the electromagnetic pneumatic valve used more widely in the system, including: control the forerunner of four-way solenoid pneumatic valve, compressor exhaust return pipe road, cooling circuit and so on.
these position are equipped with pneumatic valve, electromagnetic through electromagnetic air valve opening, to control the refrigerant flow.
2, the working principle of
solenoid pneumatic valve without access to electricity, pneumatic valve needle under the action of the spring, the pneumatic valve passage on live, solenoid pneumatic valve in cut-off condition. When coil processing power, magnetic coil, pneumatic valve core to overcome the spring force to lift, pneumatic valve in open channel, solenoid pneumatic valve in the conduction state.
the electromagnetic principle of the pneumatic valve is actually very simple. However there are still many beginners to solenoid pneumatic valve and electronic expansion valve were confused.
the distinction between the two in the first place can be seen from the appearance is different, because the electromagnetic air valve on the power supply is V, so the electromagnetic solenoid coil for two out of line.
principle of pneumatic valves and electronic expansion impulse current driving stepper motor, coil connection line for the root or roots. In addition, the electromagnetic air valve pneumatic valve body and coil is square (mostly Trapezoidal) Pneumatic valve pneumatic, electronic expansion valve body, the circular coil.
the effect of electromagnetic pneumatic valve is controlled on and off on either side of the line, if you want to achieve the throttling generally need to use with capillary.
and electronic expansion pneumatic valve main effect is to decompression throttling of refrigerants, and its opening can be flexible change ( Indoor machine in general - Step) , so the electronic expansion pneumatic valve is the price also is a lot more expensive than electromagnetic pneumatic valve.