Pneumatic flanged ball valve is a commonly used control valve, which is widely used in petroleum, chemical, metallurgy, electric power and other industrial fields. It uses a pneumatic actuator to drive the valve core to rotate the movement, and realizes the opening and closing of the valve by controlling the air source pressure, which has the characteristics of simple structure, reliable operation and fast response. This article will introduce the control mode and operation principle of pneumatic flanged ball valve in detail.
1. The control mode of pneumatic flange ball valve.
1.Manual control: The pneumatic flanged ball valve can be controlled by a manual device, that is, the valve core is rotated by a handwheel or handle to realize the opening and closing of the valve. Manual control is suitable for special situations, such as the need to manually operate the valve in the event of a power failure.
2.Automatic control: The pneumatic flange ball valve can also be controlled by the automatic control system to achieve remote control and automatic operation. The automatic control system usually includes air source device, control valve, actuator, etc., which can realize timing control, proportional control, remote control and other functions as needed.
Second, the operating principle of pneumatic flange ball valve.
1.Air Supply**: The operation of the pneumatic flanged ball valve is dependent on the pressure of the air supply, usually using compressed air as the power source. The air supply is delivered to the actuator through the trachea, and the pressure of the air supply is adjusted according to the instructions of the control system, so as to control the opening and closing of the valve.
2.Actuator drive: The air pressure acts on the piston or diaphragm inside the actuator to generate thrust to drive the valve core to rotate. The actuator usually consists of a cylinder and a piston rod, and when the air pressure is applied to the inside of the cylinder, the piston rod is pushed and pulled, which drives the valve core to open and close the operation.
3.Spool control: The spool is a key component of the pneumatic flanged ball valve, which realizes the opening and closing of the valve through rotary motion. When the air pressure acts on the actuator, the piston rod is pushed to drive the valve core to rotate to the corresponding position, thereby changing the on-off state of the valve.
4.Control system: The operation of the pneumatic flange ball valve needs to be realized by the control system, which includes control valves, sensors, actuators and other components. The valve position and pressure signal are collected through the sensor, and the air source pressure is adjusted through the control valve, so as to achieve accurate control of the valve.
3. Advantages and disadvantages of pneumatic flange ball valves.
1.Pros:
1) Simple structure and easy maintenance;
2) Reliable operation and fast response;
3) Suitable for high temperature, high pressure and other harsh working conditions;
4) It has good sealing performance.
2.Cons:
1) It needs to be equipped with air source equipment, and the cost is high;
2) High environmental requirements and easy to be affected by pollution;
3) It needs to be checked and maintained regularly to maintain the normal operation of the air source system.
To sum up, as a commonly used control valve, pneumatic flange ball valve has a wide range of application prospects in the industrial field. Through the detailed introduction of this article, I believe that readers have a deeper understanding of the control mode and operation principle of pneumatic flange ball valves, and can also be better applied to practical projects, give full play to their advantages, and solve practical problems in engineering.