Starting from the temperature sensitivity study pneumatic cut-off valve

Pneumatic cut-off valve is to point to in case of an emergency, the valve will quickly close or open, avoid to cause accidents. Temperature insensitive type current limiting the role of pneumatic cut-off valve is used to restrict flow in pipe line is too large, when the pipeline flow reaches the set value, can be cut off in the back by the method of mechanical cutting fluid, in order to prevent due to the large pipe damage or leakage causing huge loss of hydraulic fluid and damage of hydraulic components in the accident, so as to improve the reliability and safety of the hydraulic system. Cut-off valve is one of the automation system of actuators, pneumatic diaphragm actuator by a more spring or floating piston actuators and pneumatic control valve, the reception of the regulating instrument signal, fluid control technology of the pipe on the cut, or switch. It has a simple structure, sensitive reaction, reliable operation, etc. According to the temperature sensitive not current limit shut-off valve specifications and function requirements, developed with modular structure temperature not sensitive flow cut-off valve. Pneumatic cut-off valve using axial triangle groove area of the throttle to the output flow testing, through the throttle valve flow signal into the differential signal; In the throttle valve setting temperature compensating device, using PVC heat bilges cold shrink resistance to change of throttling flow area area size, in order to increase/decrease the throttling effect, make the import and export pressure difference basic remains the same, in order to make sure to cut off the flow value is affected by temperature is smaller.