The results of the calibration of the residual stress distribution diagram in Figure 2 show that the farther away from the weld center, the smaller the residual stress. The reasonable design of the welding seam structure of the pneumatic ball valve body can effectively reduce the residual stress caused by the deformation of the valve body after welding. At the same time, different auxiliary methods such as vibration and air cooling can reduce the residual stress after welding to varying degrees. In general, vibration welding can effectively release residual stress after welding. After welding, X-ray flaw detection and ultrasonic flaw detection are completely qualified; Mechanical property evaluation, tensile test, impact test and side bending test are qualified; The weld heat affected zone is qualified according to JB4708.

The structural features of series pneumatic ball valves are:
Pneumatic actuator: new series GT pneumatic actuator, double acting and single acting (spring return), rack and pinion drive, safe and reliable; Large diameter valves are driven by a series of HAW pneumatic actuators, with reasonable structure, large output torque, double acting and single acting (spring return); Refer to our pneumatic actuator sample.