Buy pneumatic valve should pay attention to the problem: First, to understand the common type of valve: Pneumatic valve is a pneumatic system control element used to control the flow of fluid in the system, the type of many styles, the user can according to Choose your own needs. Common types of reversing valve are the following: 1, according to the outlet points: two, three, four and five; 2, according to the job location points: two and three. 3, according to the control mode points: pneumatic and electric control, direct acting and pilot; 4, according to the controlled medium points: fluid valve and gas valve; 5, according to function points: normally closed and normally open, Vent and intermediate gas supply; 6, according to the structure points: a globe valve and slide valve; Second, the purchase of pneumatic valve, should pay attention to the following points: 1, the valve thread interface: valve nominal Path and air port threads do not correspond one by one, therefore, the choice of directional valve should pay attention to the interface thread. 2, the installation of reversing valve size: the same type, the function of the reversing valve manufacturers vary in shape and installation dimensions vary. 3, for the action is simply neat, not dragons. 4, solenoid valves, especially AC solenoid valve should pay attention to its insulation properties. To ensure the operator's personal safety. 5, the valve should be no leakage, the smaller the better leak. Otherwise, it will affect the system's normal work, and waste energy. 6, pay attention to the valve's date of manufacture, the valve to put too long, its grease will be aging, affecting the normal operation of the valve.
