Pneumatic high-temperature ball valve is a kind of control valve commonly used in the industrial field, which has the characteristics of high temperature resistance, good sealing, simple structure, etc., and is widely used in petroleum, chemical, metallurgical and other industries. In industrial production, it is of great significance for the control and operation of high-temperature media. This article will introduce the control mode and operation principle of pneumatic high-temperature ball valve in detail.
1. The control mode of pneumatic high-temperature ball valve.
1.Manual control mode.
Manual control is the most basic control method, which allows the valve to be opened and closed by manually rotating the handle or gear. This method is simple to operate and low cost, but for large-diameter, high-temperature, high-pressure ball valves, it requires a lot of manpower and is not safe enough, so it is rarely used in practical applications.
2.Pneumatic control mode.
Pneumatic control is a widely used control method, which realizes the opening and closing of valves through pneumatic actuators. The pneumatic actuator receives the control signal, converts it into mechanical force, and drives the valve stem to realize the movement of the valve. The pneumatic control mode is easy to operate, fast response, suitable for various media and working conditions, and is a commonly used control mode in the industrial field.
3.Electrically controlled mode.
Electric control is the use of electric actuators to realize the opening and closing of valves, and to drive the actuators by receiving electrical signals. The electric control mode is easy to operate, can realize remote control, and is suitable for occasions that require frequent adjustment, but for high-temperature media, the use of electric actuators is limited to a certain extent.
Second, the operating principle of pneumatic high-temperature ball valve.
1.Valve body structure.
The main structure of pneumatic high-temperature ball valve includes valve body, valve stem, valve core, sealing ring and other components. The spool is spherical and rotates to control the medium. The sealing ring is made of high-temperature resistant material to ensure the sealing performance of the valve in high-temperature environment. The stem is driven by a pneumatic actuator or a manual device to drive the rotary motion of the spool.
2.Principle of operation.
When the pneumatic actuator receives the control signal, the valve is opened and closed through the control of the air source. When the air source enters the pneumatic actuator, the air pressure acts on the piston to generate a force, driving the valve stem to move up and down, so as to realize the opening and closing of the valve. During operation, precise control of the valve opening can be achieved by adjusting the pressure and flow rate of the air supply.
3.Temperature control.
In the process of controlling high-temperature medium, it is necessary to consider the influence of the temperature of the medium on the valve and its sealing performance. Therefore, when designing pneumatic high-temperature ball valves, it is necessary to select high-temperature resistant materials and take into account the thermal expansion coefficient of the sealing ring to ensure that it can still maintain good sealing performance in high-temperature environments.
To sum up, the pneumatic high-temperature ball valve is a control valve that is widely used in the industrial field, which has the characteristics of easy operation and fast response. In practical application, according to the characteristics of the medium and the process requirements, the appropriate control mode and valve structure are selected to ensure the stability and safety of the system operation.