electric regulating valve is an important execution unit in industrial automation process control instrumentation. Structure by the electric actuator and control Industrial Valves connection combination after mechanical connection after assembly, commissioning the installation of electric regulator. Actuators

in process control system, the actuator accept controller command signal to the actuator converts it into the corresponding angular displacement or linear displacement, to manipulate adjusting mechanism, the change of controlled object into and out of energy or material, in order to realize the automatic control of the process. In any of the automatic control system, the actuator is an essential part of. If the sensor to the control system of sense organs, the controller is the control system of the brain, while the actuator can be likened to do specific work hand.

actuators often work in high temperature and high pressure, low temperature, strong corrosion, high viscosity, easy to crystallization, flashing, cavitation and high pressure condition, use conditions, therefore, it is the weak link of the control system. If the actuator selection or improper use, often can bring difficult production process automation. In many cases, to cause a decline in quality control of the control system, adjust malfunction, even for medium inflammable, explosive, toxic and cause serious accidents. For this, for actuators correct selection and installation, maintenance and so on each link, must give enough attention.

actuators according to different driving power, can be divided into pneumatic actuator, hydraulic actuator and electric actuator.

the structure and working principle of electric control valve

1, the basic structure of electric control valve

the upper electric control valve actuator, accept output regulator 0 ~ 10 madc or 4 ~ 20 madc signals, and convert them to corresponding linear displacement, a regulating valve at the bottom of the push action, regulating the flow of fluid directly. All kinds of electric control valve actuators are basically the same, but the regulator ( Regulatory agencies) Structure by using a lot of different types of conditions, the most commonly used is direct single seat and two straight double seat.

2, the basic structure of electric actuator

the electric actuator is mainly consists of isolated electrical parts and transmission parts, motor as a connection between two isolated part of the parts. Motor output torque, according to the requirements of control through multistage spur gear is passed on to the trapezoidal screw, trapezoidal screw thread commutation torque for thrust. So trapezoidal screw by self-locking output shaft transfer straight trip to the valve stem. The actuator output shaft with a swivel, prevent transmission output shaft radial locking devices can also do move position indicator. On the output shaft snap ring even there is a flagpole, flagpole with the output shaft synchronous operation, the rack plate connected with the pole will output shaft displacement is converted into electrical signals, to provide intelligent control panel for comparison and valve position feedback signal output. At the same time, the stroke of actuators can be made of two main rack panels limit switch open limit, and by the mechanical limit protection.

3, the working principle of the actuator

electric actuators based on motor drive source, based on direct current control and feedback signal, the principle block diagram is shown in figure 3. When the controller's input is a signal input, the signal is compared with position signal, when the two signals deviation is greater than the dead zone, produces power output controller, servo motor drive rotation reduce reducer output shaft in the deviation of the direction, until the deviation is less than the dead zone. The output shaft is stable in the position of corresponding with the input signal.

4, the structure of the controller

controller by the main control circuit, sensor, with LED operation buttons, split phase capacitor, terminal blocks, etc. Intelligent servo amplifier based on the special single chip microprocessor, through the input circuit converts analog signals, valve position resistance signal into digital signal, the microprocessor according to the sampling results by artificial intelligent control software, according to the results and output control signals.

5, the regulator is the basic structure of the

regulator direct contact with modulated medium in the process piping, valve core movement within the body, change the circulation between the valve core and valve seat area, namely the change of the resistance coefficient of valve the process parameters can be regulated.

the figure below gives a direct single seat and direct double seat typical structure, it consists of the valve cover ( Or high temperature on the cover) , valve body, valve cover, valve core and valve stem of the Industrial Valves core parts, valve seat, packing, pressure plate, etc.

direct single seat of the valve body only a valve core and a valve seat, is characterized by simple structure, small leakage ( Even can be completely cut off) And allow the pressure difference is small. Leakage is small, therefore, it is suitable for requirements, working pressure difference of small clean medium occasion. Should pay special attention to in the application of the permissible differential pressure, prevent the valve closed tightly. Pass-through two-seater regulating valve body contains two valve core and valve seat. It compared with the same caliber single-seat valve, flow capacity is about 20% ~ 25%. Because the fluid to the upper and lower two forces on the Industrial Valves core can offset each other, but the upper and lower two valve core to close at the same time, so the two-seater valve has allowed the characteristics of the differential pressure, larger leakage. Therefore applicable to the large pressure difference on both ends of the valve, leakage requirement is not high, clean medium occasion, not suitable for the occasion of high viscosity and fiber.

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