Self-operated regulating valves are a very common type of regulating valve, and are loved by professionals because they are self-reliant and do not need to be driven by pneumatic or electric methods. So, how is the adjustment of the solenoid directional control valve? Next, follow me forward to see.
Self-regulating valves are used to adjust the total flow of the medium, working pressure, temperature, level meter and other process parameters in the industrial control automation process management industry. According to the control signal in automation technology, fully automatic adjustment valve opening degree, and then complete the total flow of media, working pressure, temperature and water level adjustment.
A, the principle of self-operated temperature control valve (heating type)
Temperature regulating valve is based on the basic principle that the liquid cannot shrink and heat up and cold down to work. Self-operated temperature regulating valve for heating, when the controlled target temperature is less than the set temperature, the liquid in the temperature package collects, the force in the electric actuator pendulum is reduced, and the valve core member opens the gate valve under the action of torsion spring force to enhance the total flow of heating medium such as steam and rolling oil, so that the controlled target temperature rises until the controlled target temperature reaches the preset value, the valve turns off, and after the valve turns off, the controlled target temperature decreases, the valve After the valve is turned off, the controlled target temperature decreases, the valve opens again, and the heating medium enters the heat exchanger, and the temperature increases, so that the controlled target temperature is a stable value. Valve open degree size and the specific temperature of the target to be controlled and set the temperature of the error.
Second, the principle of self-operated temperature control valve (refrigeration type)
Refrigeration with self-operated temperature control valve principle can be referred to heating with self-operated temperature control valve, only when the valve core components in the electric actuator and spring force efficacy to open and turn off and temperature off valve in turn, the valve body according to the cold medium, the key for temperature manipulation in the cooling device.
Third, the principle of self-operated flow control valve
Controlled media keyed into the valve, the valve before the working pressure P1 according to the manipulation pipeline keyed into the lower membrane chamber, by the relief valve throttling valve before the working pressure Ps keyed into the upper membrane chamber, the difference between P1 and Ps that △Ps = P1-Ps called reasonable working pressure. P1 efficacy in the valve piece to form the thrust and Ps efficacy in the valve piece to form the thrust difference and torsion spring axis force phase state determines the relative position of the valve core and high pressure gate valve, and thus The total flow rate through the valve is determined. When the flow through the valve data flow rate is raised, that is △Ps raised, the conclusion P1, Ps respective efficacy then down and up the membrane chamber, so that the valve center to the high-pressure gate valve orientation moved, and then changed the valve center and the total area of the flow in the middle of the valve block, so that Ps raised, raised before the thrust of Ps efficacy in the pulse damper plus torsion spring axis force and P1 efficacy in the pulse damper thrust in the new part to cause equilibrium to manipulate The purpose of the total flow rate.