The stability of the pneumatic control valve control system determine its reliability

Pneumatic control valve is different from the traditional sense of the pneumatic control valve, its unique auxiliary power amplifying device is throttling tube structure, the role of the power amplifier. Pneumatic control valve is an important executive components in nuclear power plant control system, the safety and reliability of the nuclear safety level of pneumatic control valve is particularly important. Pneumatic control valve depends largely on the reliability of the control system is stable, the dynamic characteristics of the pneumatic control valve and pneumatic control valve in control system design has played an extremely important role. For throttling tube working principle of pneumatic control valve, explore its dynamic response for the first time. Using Pro/ENGINEER software in the process of research of throttling tube type pneumatic control valve flow modeling, ANSYS ICEM mesh with software on passage geometry model, the opening of pneumatic control valve with CFD software FLUENT to dynamic numerical simulation process of change, and change the valve in the opening process of throttling tube and the spacing between the piston and the piston surface stress and the dynamic response of the throttling pipe bottom stress curve, provided the basis for valve control system design.