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Valve classification
Wide range of valves, a wide range of classification methods are more. The total can be divided into two categories: The first type of automatic valve: relying on the media (liquid, gas) their own ability to operate the valve. Such as check valve, safety valve, regulating valve, steam trap, pressure reducing valve. The second type of drive valve: With manual, electric, hydraulic, pneumatic to manipulate the action of the valve. Such as valve, globe valve, throttle, butterfly valve, ball valve, plug valve. In addition, the valve classification there are several ways: First, according to the structural features, according to the closure of the valve seat relative to the direction of movement can be divided: 1. Sectional shape: The closure moves along the center of the seat. 2. Gates: Closure moves along the vertical seat center. 3. Tap and Sphere: The closure is a plunger or ball that rotates around its centerline. 4. Turn-on; the closing piece rotates around the shaft outside the seat. 5. Dish: Closure of the disc, rotating around the inside of the valve seat. 6. Slide valve: Closure slide in a direction perpendicular to the passage. Second, according to use, according to the different purposes of the valve can be divided: 1. Broken with: used to connect or cut off the pipeline medium, such as globe valve, gate valve, ball valve, butterfly valve. 2. Non-return: used to prevent media backflow, such as check valve. 3. Adjustment: used to regulate the medium pressure and flow, such as regulating valve, pressure reducing valve. 4. Distribution: used to change the media flow, distribution of media, such as three-way cock, distribution valve, slide valve. 5. Safety valve: When the medium pressure exceeds the specified value, it is used to discharge excess medium to ensure the safety of piping system and equipment, such as safety valve and accident valve. 6. His special purposes: such as steam traps, venting valves, sewage valves. <! [endif]> Third, according to the driving method, according to different driving methods can be divided: 1. Manual: With the handwheel, handle, lever or sprocket, a manpower-driven, transmission torque, equipped with worm gear, gear and other deceleration devices. 2. Electric: driven by a motor or other electrical device. 3. Powered by: (water, oil) to drive. 4. Pneumatic; driven by compressed air. Fourth, press, according to the nominal pressure of the valve can be divided: 1. Vacuum valve: absolute pressure <0.1MPa 760mm Hg high valve, usually mm Hg or mm water column that the pressure. 2. Low pressure valve: Nominal pressure PN ≤ 1.6MPa valve (including PN ≤ 1.6MPa steel valve) 3. Medium pressure valve: Nominal pressure PN2.5-6.4MPa valve. 4. High pressure valve: Nominal pressure PN10.0-80.0MPa valve. 5. Ultra-high pressure valve: Nominal pressure PN ≥ 100.0MPa valve. Fifth, according to the temperature of the medium, according to the valve medium temperature can be divided: 1. Normal valve: Suitable for medium temperature -40 425 ℃ valve. 2. High temperature valve: suitable for medium temperature 425 600 ℃ valve. 3. Heat-resistant valve: suitable for medium temperature above 600 ℃ valve. 4. Low temperature valve: suitable for medium temperature -40 -150 ℃ valve. 5. Cryogenic valve: suitable for medium temperature below -150 ℃ valve. Six, according to the nominal diameter points, according to the nominal diameter of the valve can be divided: 1. Small-caliber valves: Nominal diameter DN <40mm valve. 2. In the caliber valve: nominal diameter DN50 ~ 300mm valve. 3. Large-caliber valves: DN350 ~ 1200mm nominal diameter of the valve. 4. Extra large diameter valve: Nominal diameter DN ≥ 1400mm valve. Seven, according to the connection with the pipe points, according to the valve and pipe connections can be divided; 1. Flange connection valve: Valve body with flange, flanged connection to pipe. 2. Threaded valve: the valve body with internal or external thread, threaded connection with the pipeline valve. 3. Welded connection valve: body with a welding port, and the pipe connected by welding valves. 4. Clamp connection valve: the body with a clip on the pipe with a clamp connection valve. 5. Card sets connected to the valve: the card and the pipeline connected with the valve.