Hastelloy pneumatic control valve is to compressed gas as the power source to the cylinder as the actuator, and by means of valve positioner, converter, solenoid valve, security valve, gas filter and other accessories to drive the valve, to achieve switch or Proportional adjustment, receiving the industrial automation control system control signal to complete the regulation of pipeline media: flow, pressure, temperature, level and other process parameters. Hastelloy pneumatic valve is characterized by simple control, rapid response, and intrinsically safe, no need to take another explosion-proof measures. 
Uses and characteristics: 
A, Hastelloy pneumatic valve with the use and characteristics of the use of a rectangular rotary structure, which is used with the valve positioner supporting, can achieve proportional adjustment; V-valve is the most suitable for a variety of adjustment occasions, with a large rated flow coefficient , Adjustable than large, good sealing effect, adjust the performance of sensitive, small size, can be installed vertically. Suitable for controlling gas, steam, liquid and other media. 
B, the characteristics of a rectangular structure, by the V-valve body, pneumatic actuators, locators and other accessories; there is a similar hundred percent of the inherent flow characteristics; the use of dual bearing structure, starting torque is small, with a pole Good sensitivity and speed of induction; super shear ability. 
C, pneumatic piston actuator with compressed air as a power source, through the movement of the piston to drive the crank arm for 90 degrees rotation, to make the valve automatically open and close. Its components are: adjusting bolts, the implementation of the body box, crank arm, cylinder block, cylinder shaft, piston, connecting rod, universal axis. 
D, Hastelloy pneumatic control valve works: Hastelloy pneumatic control valve by the implementing agencies and regulatory agencies. The actuator is the thrust part of the control valve, which generates the corresponding thrust according to the size of the control signal pressure to push the adjustment mechanism. The valve body is a regulating part of the Hastelloy pneumatic control valve, which directly contacts the regulating medium to regulate the flow of the fluid. 
Installation principles: 
(1) Hastelloy pneumatic control valve installation location, from the ground requires a certain height, the valve up and down to leave a certain space in order to carry out the valve disassembly and repair. For the control valve with pneumatic valve positioner and hand wheel, it is necessary to ensure easy operation, observation and adjustment. 
(2) regulating valve should be installed in the horizontal pipe, and vertical and vertical pipe, generally under the valve to be supported to ensure a solid and reliable. For special occasions, the need to adjust the valve installed in the vertical pipe, the control valve should also be supported (except for small diameter control valve). Installation, to avoid additional stress to the control valve). 
(3) the working temperature of the control valve to (-30 ~ +60) relative humidity of not more than 95% 95%, relative humidity of not more than 95%. 
(4) Before and after the control valve should be straight pipe, the length of not less than 10 times the diameter of the pipe (10D), in order to avoid the valve straight pipe section is too short and affect the flow characteristics. 
(5) When the diameter of the regulating valve is different from that of the process piping, the reducer shall be connected. In the small diameter control valve installation, available thread connection. The direction of the fluid on the valve body should be consistent with the direction of the fluid. 
(6) to set the bypass pipe. The purpose is to facilitate switching or manual operation, in the case of non-stop control valve for maintenance. 
(7) control valve in the installation before the complete removal of foreign matter in the pipeline, such as dirt, welding slag and so on. 
Precautions for use: 
1, the valve should be stored in a dry room, the two ends must be blocked. Not allowed to store storage 
2, long-term storage of the control valve should be regularly checked, remove the dirt, in the movement part and the processing surface should be coated with anti-rust oil to prevent rust. 
3, the valve should be installed in the horizontal pipe, compulsory vertical installation. Stem up. 
4, compulsory according to the arrows indicated by the direction of the media flow direction to install. 
Basic connection size: