The role of self-reliance type pneumatic control valve and installation need to be aware of

Self-reliance type pneumatic control valve is the valve but different is that it does not need additional power supply, is self-reliance self-reliance it can generate its own energy as a drive. It has what effect? Control valve pneumatic control valve is also called self-reliance self-reliance type type, is a kind of rely on through the media in the valve itself pressure, temperature, as energy drive valve work automatically, do not need the power converter and secondary instrument of pneumatic control valve. Self-reliance type pneumatic control valve is mainly divided into pneumatic pressure regulator, self-reliance self-reliance type differential pressure pneumatic control valve, pneumatic control valve, self-reliance self-reliance type temperature flow pneumatic control valve. Role of self-reliance type pneumatic control valve using valve the output feedback signal ( Pressure, differential pressure, temperature) Through signal to the actuator driven disc change of valve opening, to achieve the purpose of regulating pressure, flow, temperature. Direct role in direct action type pneumatic control valve is also known as the spring load type pneumatic control valve, its have elastic element structure: such as spring, bellows, bellows type of bulb, etc. , the principle of balance with the elastic force feedback signal. Indirect effect indirectly type pneumatic control valve, added a command ( Pilot valve) It play a role of feedback signal amplification and then through the actuator, drive the main valve disc movement to achieve the purpose of the change of valve opening. If be pneumatic pressure regulator, feedback signal is the valve outlet pressure, by introducing actuator signal pipe. If the flow pneumatic control valve, the valve outlet has an orifice ( Or other resistance devices) Introduced by orifice plate ends out differential pressure signal actuators. If the temperature of pneumatic control valve, valve of the export is the temperature sensor ( Temperature or package) Through the temperature sensor in medium heat bilges cold shrink drive actuators. Install the key 1. Valve used in gas medium or low viscosity liquid, usually type ZZY self-reliance type pressure pneumatic - valve to erect installed in a horizontal pipe, when position space does not allow to flip or inclined outfit. 2. To facilitate the maintenance and operation, the pressure regulating valve should leave proper space all around. 3. When medium for clean gas or liquid, the valve before the filter is not installed. 4. Pressure regulating valve size is too large, DN 100 or higher) , shall have the fixed bracket when confirmed that medium is very clean, 3 is not installed. 5. Location is not allowed, the by-pass valve ( Manual) Can be omitted, We do not recommend) 。 6. After the valve group users according to need optional check valve, relief valve, etc. 7. Valve used in steam or high viscosity liquid medium, usually type ZZY self-reliance type pressure pneumatic - valve to handstand installed in a horizontal pipe, condenser, Steam with self-reliance type) Should be higher than the pressure regulating valve actuator and below the valve before and after taking over. Before using the condenser shall be filled with cold water, irrigation time after about 3 months.