In practical applications, the directional control valves can be divided into several categories according to different needs: (1) According to the flow direction of gas in the pipeline, if only gas is allowed to flow in one direction, such a Valve is called a unidirectional control valve, Valve, shuttle valve, etc .; can change the gas flow control valve called the valve, such as the commonly used 2way2port, 2way3port, 2way5port, 3way5port and so on. (2) According to the control mode can be divided into solenoid valve, mechanical valve, pneumatic valve, man-made valve. One solenoid valve can be divided into two kinds of single and double electric control valve; mechanical valve can be divided into ball valve, roller valve and other gas-controlled valve can also be divided into single-and double-control valve; human valve can Divided into manual valve, pedal valve two. (3) according to the working principle can be divided into direct acting valve and pilot valve, direct acting valve is to rely on human or electromagnetic force, pneumatic direct to achieve the required valve; pilot valve is composed of pilot and valve body 2 parts, there are Pilot piston driven piston valve body inside the valve to achieve commutation. (4) According to the working position of the valve stem can be divided into 2way, 3way valve. (5) according to the number of pores on the valve to be divided, can be divided into 2port, 3port, 5port valve.
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