There are many different kinds of pneumatic valve widely used, and classification method is more also. The general can be divided into two categories: the first kind of automatic valve: rely on the media ( Liquid, gas) The ability of itself and action of the valve itself. Such as check valve, relief Industrial Valves, regulating valve, drain valve, pressure reducing valve, etc. The second drive valve: with the help of manual, electric, hydraulic, pneumatic to manipulate the action of the valve. Such as gate valve, cut-off valve, throttle valve, butterfly valve, ball valve, plug valves, etc. Door form: shut down a moving along the seat center, as shown in figure 1, 1. Gate shape: shut down a movement along the vertical seat center, as shown in figure 1, 2. Cock and ball: closing is a plunger or a ball, the center line of rotation around itself, as shown in figure 1, 3. Swing type; Close a revolve around the seat outside the shaft, as shown in figure 1, 4. Disc: close a disc, revolve around inside the seat axis, as shown in figure 1, 5. Slide valve type: shut down a slide in the perpendicular to the direction of the channel, as shown in figure 1, 6. Open circuit use: used to put through or cut off the line media, such as the cut-off valve, gate valve, ball valve, butterfly valve, etc. Stop recycling: used to prevent the backflow medium, such as check valve. Regulate use: used to adjust the pressure and flow rate of medium, such as regulating valve, pressure reducing valve. Distribution with: the flow direction of medium is used to change and distribution medium, such as the three-way cock, distributing Industrial Valves, valve, etc. In medium pressure relief valve: more than specified value, used to discharge redundant medium, to ensure the safety of pipeline systems and equipment, such as relief valve, valve accident. He special purpose, such as hydrophobic valve, exhaust valve, drain valve etc. In this paper, the keyword search: long ding automatic control equipment co. , LTD
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