What is the principle of self-reliance type pneumatic control valve?

In use process, the use of selection and installation is to pay attention to environment, therefore, detailed understanding of the working principle and structure of the pneumatic control valve of self-reliance is very important. Self-reliance type pneumatic regulator because they do not need any external energy, such as power supply, gas source, only rely on media's own energy to drive, both energy saving and environmental protection, easy to use, after the installation is set pressure value can be put into automatic operation, so the control accuracy is not high, and the lack of electricity, gas, has been more and more widely used. But in use process, must pay attention to the particularity of selection, otherwise easy to cause accident. Structure and working principle of the process medium in front of the valve pressure Pl after, the seat of the throttling valve core, valve after pressure P2. P2 input actuators through the control line of the film under room role in particular, the force and reacting force of spring balance, determines the position of the valve core and valve seat, valve after pressure. When the valve after pressure P2 increases, the P2 role in particular of force also will increase. At that point in particular reaction force is greater than the spring, the valve core is close to the location of the seat, until a particular force and spring force balance. At this time, the circulation between valve core and valve seat area decreases, flow resistance, making the P2 down to a set value. Similarly, when the valve after pressure P2 lower direction contrary to the above, this is the working principle of pressure regulating valve later. When need to change the valve after pressure P2 set value, can adjust the adjusting nut 8. The technology characteristic of self-reliance type pneumatic control valve is does not require any additional energy, USES the energy of modulated medium to achieve automatic adjustment of the actuator products. Use quick opening traffic characteristics, action quick, sealed performance is good, so it is widely used in petroleum, chemical, electric power, metallurgy, food, textile, machinery manufacturing and residential building blocks, all kinds of industrial equipment of all kinds of gas, liquid and steam decompression, medium voltage ( Used for valve after adjustment) , or pressure, holding pressure ( For before the valve adjustment) The automatic control. The biggest characteristic of self-reliance type pneumatic control valve, can work in places where no electricity, no gas, at the same time, save energy, pressure setting can be adjusted freely in the run. Attached the condenser can be used under the temperature 350 ℃ or less.