The Advantages and Selection Principles of Ball Valve
The ball valve is the evolution of the plug. It's opening and closing member as a ball, the use of the ball around the axis of the stem rotation of 90 degrees to achieve open and close. The ball valve in the pipeline is mainly used to cut off, distribute and change the direction of media flow, designed V-shaped opening of the ball valve also has a good flow regulation function.
The advantages of ball valve
1. Simple structure. Small volume. Lightweight.
2. Small fluid resistance. The resistance coefficient is equal to the same length of the pipe section.
3. Tight and reliable. At present, the sealing surface material of the ball valve is widely used plastic, good sealing, and has been widely used in vacuum systems.
4. In fully open or fully closed, the ball and seat sealing surface and media isolation. When the medium passes, it will not cause erosion of the sealing surface of the valve.
5. Easy to operate. Open and close quickly. Just rotate 90° from fully open to fully closed, easy to control from a distance.
6. Easy maintenance. The ball valve is simple in structure. Seals are generally movable, disassembly and replacement are relatively convenient.
7. Wide range of applications. Small diameter to a few millimeters, large to several meters. High vacuum to high pressure can be applied.
The main principles of ball valve selection
1. The transmission pipeline and storage equipment of refined oil products, the choice of flange connection ball valve.
2. Oil, natural gas transmission lines, the need to clean the pipeline, and need to be buried underground, the choice of full diameter, full welded structure of the ball valve; buried in the ground, choose full diameter welded connection or flange connection of the ball valve; branch pipe, choose flange connection, welded connection, full diameter or reduced ball valve.
3. City gas and natural gas pipeline, choose flange connection and internal thread connection of the floating ball valve.
4. In low-temperature media pipeline systems and devices, it is appropriate to use the low-temperature ball valves with valve cover.
5. Metallurgical system in the oxygen pipeline system, it is appropriate to use a strict degreasing treatment, flange connection of the fixed ball valve.
6. On the piping system of the catalytic cracking unit of the oil refinery, the lift rod ball valve can be used.
7. Metallurgical systems, electric power systems, petrochemical devices, urban heating systems, high-temperature media in the piping system or device, you can choose metal-to-metal sealed ball valves.
8. Chemical systems, such as acid and alkali corrosive media devices and piping systems, it is appropriate to use austenitic stainless steel manufacturing, polytetrafluoroethylene for the seat seal of the full stainless steel ball valve.
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