Views: 0 Author: J-VALVES Publish Time: 2024-04-29 Origin: Site
The pneumatic butt welded ball valve is a type of valve that controls the on-off of the fluid by driving the rotation of the ball through a pneumatic actuator. It has the advantages of rapid opening and closing, good sealing performance and convenient operation, and is suitable for various industrial scenarios. With the improvement of industrial automation, the application of pneumatic butt welded ball valves is becoming increasingly widespread, and the requirements for their performance and reliability are also becoming increasingly strict.
I. Working Principle
The pneumatic butt weldeding ball valve consists of a valve body, a ball, a valve seat, a pneumatic actuator, etc. Its working process is as follows: when the pneumatic actuator receives a signal, the air source pushes the piston, causing the ball to rotate 90°, thus achieving the on-off of the fluid. The sealing principle is achieved through the close contact between the valve seat and the ball. The valve seat usually uses elastic materials, such as polytetrafluoroethylene, to ensure no leakage when closed.
II. Design Key Points
(1) Valve Body Design
The valve body material should be selected according to the working conditions. Carbon steel is suitable for normal temperature and pressure, stainless steel is suitable for corrosive environments, and alloy steel is suitable for high-pressure and high-temperature conditions. The butt welded connection method has high strength, good sealing performance, and is convenient for installation. The valve body design needs to meet the strength requirements, and the appropriate wall thickness should be selected through calculation.
(2) Sphere and Valve Seat Design
The sphere material is mostly stainless steel or alloy steel, and its surface is precisely processed to ensure sealing. The valve seat material is commonly polytetrafluoroethylene. The sealing performance is improved by optimizing the shape and formula. During the design stage, the sealing performance needs to be tested to ensure zero leakage.
(3) Pneumatic Actuator Design
Pneumatic actuators are divided into single-acting and double-acting types. Single-acting is suitable for occasions with high safety requirements, and double-acting is suitable for frequent operations. The air source pressure and flow rate should be selected according to the opening and closing torque and operating speed, usually 0.4 - 0.6MPa. The control system includes solenoid valves, limit switches, and signal interfaces to achieve remote control.
