The selction of control valve bonnet

Update time: 22-03-20 Views: 1281
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:

Standard Bonnet
Standard bonnets are suitable for normal temperature applications.
Recommended working temperature range: -20 to +230°C

Extension Bonnet
Extension bonnets are used for either high or low temperature service to protect valve stem packing from extreme process temperatures.
Recommended working temperature range:-60 to +450°C

Bellows Bonnet
Bellows Bonnets are often used when the process fluid is toxic, volatile, radioactive, or highly expensive.

Cryogenic Bonnet
Cryogenic Bonnets are used for low temperature working condition, especially for LNG(liquid natural gas).
Recommended working temperature range: -196 to -60°C