Application range of various plastics and rubbers used in valves 1. Commonly used plastic materials in valves 1.1 PTFE PTFE, the application temperature range is -200~230℃, and the decomposition temperature is 415℃ Corrosion resistance is very good, almost all chemical media can be used. Known as the king of corrosion resistance. Widely used in gaskets, seal rings, bearings and short pipes wi
The flow characteristic is one of the important technical parameters of the control valve, and the deviation of the flow characteristic directly affects the stability of the automatic control system. Flow Characteristic:Relationship between flow through the valve and percent rated travel as the latter is varied from 0 to 100 percent. This term should always be designated as
Control valve bonnet is a part located between the actuator and the valve body assembly, Its main function is to prevent media leakage and connect the actuator. In order to adapt to different temperature and different medium sealing requirements, There are 5 common bonnet forms as follows:
The control valve is the most used terminal control element in industrial production, which often determines whether the process control is timely and effective. If the control valve appears failure, the control loop will be forced to interrupt the control operation, which may lead to greater system failures, safety risks and incalculable economic losses. Among all control valve failures, the ina
Currently, the most widely used standards are BS (UK), DIN (Germany), JIS (Japan), ISO (International Organization for Standardization), etc. Although the American Standards Agency has been working hard to publish American standards in cooperation with other national standards to meet the requirements of internationalization, almost no standard can cross national borders. When selecting standa
Packing is a dynamic sealing filling material used to fill the space of the stuffing box to prevent the medium from leaking through the valve stem or the inner wall of the stuffing box. Packing is an important component of the control valve, it is the key to prevent the leakage of the medium. To achieve the ideal sealing effect, the material, structure, and reasonable installation method o
The control valve consists of two parts: the valve body part and the actuator. The actuator is an important part of the control valve. Different actuators have different characteristics. When selecting the type of actuator, in addition to the functionality, the energy and power supply on the spot should also be considered. Control valve manufacturers must fully understand the different characteris
Air to open or Air to close is an important parameter for pneumatic control valves, the choice between them is mainly determined by the fault location. The fault location is defined as the valve position when there is a air supply failure on site, or when the power supply fails. According to the different action types of pneumatic actuators, we can divide them into the following three categories:
