Pneumatic ball valve _ dealing with harsh environment
Time: 2018-11-05 13:18:28 Source: Yonglong Valve Reading: zero second
Pneumatic ball valve _ dealing with harsh environment
Pneumatic ball valve consists of angle travel pneumatic actuator and ball valves of different materials through mechanical connection to form a pneumatic valve. The pneumatic ball valve can be equipped with a travel limit switch, a solenoid valve, a pressure reducing valve and a 0.4-0.7MPa air source to realize the switch operation, and send two pairs of passive contact signals to indicate the switch of the valve. The unique advantage of the single acting type is that once the power source fails, the pneumatic switch ball valve will automatically be in the open or closed position according to the requirements of the control system.
The pneumatic ball valve is composed of a pneumatic piston actuator and a ball valve. The pressure of compressed air drives the actuator to rotate and drive the valve rod to switch. The pneumatic ball valve can be installed at any position in the pipeline. It can be closed tightly only by using the pneumatic actuator to rotate 90 degrees with the air source and a small rotating torque. The completely equal inner cavity of the valve body provides a straight flow passage with little resistance for the medium.
Ball valve design features:
▼ ISO5211 platform connection
▼ Anti fly out design of valve rod
▼ Valve rod anti-static device
▼ Adjustable function of upper seal
▼ Fire protection structure design of valve chamber
▼ Shell wax removal precision casting
Ball valve design standard:
|
Design and manufacture |
GB/T-12237 |
|
Flange connection |
HG/T-20592 GB/T-9113 |
|
Structure length |
GB/T-12221 |
|
Wall thickness standard |
GB/T-26640 |
|
Inspection test |
GB/T-26480 |
Advantages of ball valve structure:
1. Good sealing performance. The sealing ring of the valve seat is made of elastic materials such as polytetrafluoroethylene, which is easy to ensure sealing, and the sealing force of the ball valve increases with the increase of the medium pressure.
2. The medium fluid resistance is small. The ball valve has the smallest fluid resistance among all valves. Even the reduced diameter ball valve has relatively small fluid resistance.
3. The valve rod seal is reliable. When the ball valve is opened and closed, the valve stem only rotates, so the packing seal of the valve stem is not easy to be damaged, and the sealing force of the valve stem reverse seal increases with the increase of the medium pressure.
4. The switch is fast and convenient. As long as the valve rod rotates 90 °, the ball valve will complete the full open or full close action, which is easy to realize fast opening and closing.
5. The opening and closing of the ball valve is only 90 ° rotation, so it is easy to realize automatic control and remote control. The ball valve can be equipped with pneumatic actuator and electric actuator.
pneumatic valve Its main characteristics are compact structure, easy operation and maintenance. Different valve body materials and sealing materials are selected for different working conditions. It is suitable for corrosive media such as water, steam, solvent, acid and alkali, liquid ammonia, methanol, natural gas, and also suitable for media with poor working conditions, such as oxygen, hydrogen peroxide, methane, ethylene, etc. The valve body of the ball valve can be integral or combined.
Pneumatic ball valve mainly includes pneumatic ball valve, pneumatic three-way ball valve, pneumatic O-type ball valve, pneumatic V-type ball valve, pneumatic cut-off ball valve, pneumatic fluorine lined ball valve, pneumatic regulating ball valve and other series of products. The pneumatic ball valve is light to open and close, small in size, can be made into a large caliber, reliable in sealing, simple in structure, convenient in maintenance, the sealing surface and spherical surface are often closed, not easy to be eroded by the medium, widely used in chemical industry, petroleum, textile, power, food and pharmaceutical, refrigeration, aviation, aerospace, paper making and other industrial fields, not only can control the gas, liquid and steam media, It also applies to the control of sewage and fiber containing nature.
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