Self-reliance type to adjust the action of pneumatic valve and classification

self-reliance type to adjust the action of pneumatic valve
self-reliance type pneumatic valve adjustment are using pneumatic valve (the output feedback signal Pressure, differential pressure, temperature) Tube through the signal to the actuator driven by pneumatic valve pneumatic valve opening change, achieve the purpose of regulating pressure, flow, temperature.
self-reliance type adjustment
the advantages of pneumatic valve self-reliance type adjustment pneumatic valve is a new type pneumatic valve adjustment themselves. Compared with the manual regulation pneumatic valve, it has the advantage that can automatically adjust; Relative to the electric control pneumatic valve, its advantage is not need external motivation. The application practice proved that the closed water circulation system ( Such as hot water heating system, air conditioning chilled water system) , the proper use of the pneumatic valve, the flow distribution can be easily implemented system; Can realize the dynamic equilibrium of system; Can greatly simplify the system debugging work; Fix the pump working condition, etc.
the classification of self-reliance type pneumatic valve adjustment
self regulating pneumatic valve can be divided into direct effect and indirect effect type two kinds.

direct acting type regulating pneumatic valve direct acting type regulating pneumatic valve is also known as the spring load type pneumatic valve and its structure in elastic element, such as spring, bellows, bellows type of bulb, etc. , the principle of balance with the elastic force feedback signal.
indirectly type pneumatic valve adjustment
indirectly type pneumatic valve adjustment, add a command ( The forerunner of pneumatic valve) It play a role of feedback signal amplification and then through the actuator, drive the pneumatic valve pneumatic disc movement to change the purpose of the pneumatic valve opening.
if it is a pressure regulating pneumatic valve, pneumatic valve feedback signal is the outlet pressure, by introducing actuator signal pipe.
if it is a flow control pneumatic valve, pneumatic valve outlet has an orifice ( Or other resistance devices) Introduced by orifice plate ends out differential pressure signal actuators.
if it is temperature control pneumatic valve, pneumatic valve of the export is the temperature sensor ( Temperature or package) Through the temperature sensor in medium heat bilges cold shrink drive actuators.
self-reliance type adjustment characteristics of pneumatic valve
self regulating pneumatic valve does not need additional energy, can work in the absence of electric airless place, convenient and save the energy. Pressure piecewise range and cross each other, high precision of adjustment. Pressure setting can be set in a continuous during operation. Of pneumatic valve pressure regulation, pressure of pneumatic valve before and after pneumatic valve is to: ~ :. Rubber diaphragm detection, high measurement precision, actuator. Using pressure balance mechanism, the pneumatic valve responsive adjustment and control precision.