Production process control of pneumatic butterfly valve
1. The welding part of pneumatic butterfly valve is the welding of valve cover and magnetic isolation pipe, and the welding of magnetic isolation pipe and fixed iron core. The original self fusion welding is changed to fill welding to improve the welding strength and prevent fatigue cracks. After welding, compressive strength test and air tightness test shall be conducted to ensure welding quality.
2. Pneumatic butterfly valve is usually sealed with hard seal. In order to ensure that the sealing performance meets the specified requirements, the sealing surface of the valve seat and the sealing gasket of the valve element must be grounded. The matching grinding process is adopted for the sealing surface of valve core and valve seat, which can make the roughness of the sealing surface more than 0.2m.
3. The finishing of nut, valve core and valve body is the key part of solenoid valve. The key is the inner hole of the nut, the outer diameter of the valve plug and the roughness of the sealing surface. The surface treatment of valve core is determined as the key process. Due to the high hardness, high dimensional accuracy and easy deformation of the valve core surface, it is necessary to screen the surface treatment of the valve core.
