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The characteristics of the control valves
1. There are various types of control valves, and their applicable occasions are different. Therefore, the type of control valve should be reasonably selected according to the requirements of the technological production process.
2. Pneumatic control valves are divided into two types: air-on and air-off. The air-to-open control valve is closed in the fault state, and the air-to-close control valve is opened in the fault state. Some auxiliary equipment can be used to form a retaining valve or make the control valve self-locking, that is, the control valve maintains the valve opening before the fault occurs.
3. The way of air opening and air closing can be realized by the combination of positive and negative actuator types and positive and negative valves. When using a valve positioner, it can also be realized by a valve positioner.
4. Various control valves have different structures and have their own characteristics.
2. Pneumatic control valves are divided into two types: air-on and air-off. The air-to-open control valve is closed in the fault state, and the air-to-close control valve is opened in the fault state. Some auxiliary equipment can be used to form a retaining valve or make the control valve self-locking, that is, the control valve maintains the valve opening before the fault occurs.
3. The way of air opening and air closing can be realized by the combination of positive and negative actuator types and positive and negative valves. When using a valve positioner, it can also be realized by a valve positioner.
4. Various control valves have different structures and have their own characteristics.
