The operation of the pneumatic control valve The original pneumatic control valve is a control device that does not require external power and relies on the pressure or temperature or flow of the measured medium to change automatically according to the preset value. It is an energy-saving appearance. It integrates control and performs many functions into one, forming an independent appearance control system by itself. Integrate the functions of transmitter, controller and actuator. Different from the control valve in the general sense.
Pneumatic control valves include pneumatic pressure (low pressure) dispatch valves, pneumatic (pressure difference) flow dispatch valves, and pneumatic temperature dispatch valves. Pneumatic pressure dispatching valve is one of its clan members. Because it does not require external power, the product structure is simple, easy to use, and the amount of protection work is small. It is especially suitable for urban heating, heating, and no power supply, gas supply and need to be controlled. occasion. According to reports from Germany, this product is selected for urban heating and heating systems, and the thermal efficiency is 30% to 40% higher than before, and the energy saving effect is significant.
The operating principle of pressure dispatching behind the pneumatic valve is shown in the figure above. After the valve front pressure P1 is saved through the valve core and valve seat, it becomes the valve rear pressure P2. P2 is input into the upper diaphragm chamber through the pipeline and acts on the top plate. The force generated is balanced with the reaction force of the spring, which determines the valve core , The relative position of the valve seat controls the pressure behind the valve. When P2 increases, the force that P2 acts on the top plate also increases.
