Miniature pneumatic valve pneumatic membrane single-seat control valve regulating valve

1 control valve control valve, also known as the composition and classification of control valves, is the main type of the actuator, the control unit outputs a control signal by receiving adjustment, with the power to change the operating fluid flow. Regulating valve generally consists of actuator and valve components. If by their ticket enforcement agencies, the valve can be divided into pneumatic, electric, hydraulic three, that compressed air pneumatic control valve power source to the electrical power source for the electric control valve, the liquid medium (such as oil) pressure-powered electric hydraulic control valve, and their functions and features points, as well as solenoid valves, electronic, intelligent, fieldbus type regulating valve. Many types of valve products, the structure is varied, but also constantly updated and changed. Generally speaking valve is universal, both can be matched with the pneumatic actuator can also be matched with the electric actuators or other actuators. 2 valve type selection 2.1 control valve body type selector valve regulating valve choice is to select the most important part. Valve of many types of commonly used through single-seat, 10 kinds of straight two-seater, angular, diaphragm, low flow, tees, eccentric rotation, butterfly, sleeve type, spherical and the like. Before selecting a valve, the media will, process conditions and parameters control process of careful analysis, to collect sufficient data to understand the system requirements of the regulator valve, valve type according to the data collected to determine what to use. In the specific choices available from the following considerations: (1) disc shape of the structure major consideration based on the selected flow characteristics and unbalanced forces and other factors. (2) wear resistance when the fluid medium is a suspension containing a high concentration of abrasive particles, valve, closed joints every seat will be subject to serious friction. Therefore, the valve flow path to smooth valve's internal materials to be hard. (3) corrosion resistance as a corrosive medium, to meet the regulatory function in the case, try to choose simple valve. Temperature (4) medium pressure when the medium temperature, high pressure and great change, should be chosen disc and seat materials by temperature and pressure changes small valves. (5) to prevent the flash and the flash cavitation and cavitation only in a liquid medium. In the actual production process, steam and air not only affects the calculation of flow coefficient, but also the formation of vibration and noise, so that the life of the valve is shortened, and therefore should select a valve to prevent the valve generate steam and air.