Welding process of semi martensitic stainless steel pneumatic ball valve seat Semi martensitic stainless steel, also called martensitic precipitation hardening stainless steel, representative brand: 17-4PH. The results of many tests show that the ball is made of ZG2Cr13, the surface of which is welded with Stellite NO. 6 alloy, and the valve seat is made of 17-4PH precipitation hardening stainless steel. During the rotation of the ball, the friction pair between the valve seat and the ball can be reduced.; Locked death; The occurrence of this phenomenon greatly improves the service performance of the hard seal pneumatic ball valve. Because 17-4PH is a kind of material that is seldom used, the manufacturing process of valve seat is special, so I will discuss the production process of 17-4PH valve seat with you.

Hose pressure operating range
It is the main pressure bearing part in the pressure pipeline, with compensation function, and also acts as a sheath for the bellows. It is commonly used for the walk pipe with sufficient flexibility, which is equipped in places where vibration is avoided. Its operating temperature range is extremely wide, - 196-600 degrees.
The pressure range is generally PN0.6 － 32.0Mpa, up to 42.0MPa. One or more layers of stainless steel wires or strips can be selected to stop weaving according to the pressure in the pipeline and the application site; The corrosion resistance of the hose can be guaranteed by selecting the appropriate stainless steel brand according to the corrosivity of the medium through the pipe.
Compared with other hoses, metal bellows has a longer service life, good flexibility, fatigue resistance, high pressure resistance, upper and lower temperature resistance, corrosion resistance, etc., and high comprehensive economic benefits.
With the development of modern industry, there is a higher demand for hose performance, such as higher temperature resistance, higher pressure resistance, etc. Why the pneumatic butterfly valve fails?
Cause 1: The wire mesh sleeve is pulled off due to poor welding quality. The wire mesh sleeve is used to maintain the medium pressure of the pneumatic butterfly valve box. Therefore, if the welding quality of the screen sleeve is too poor, the screen sleeve is easily pulled off, and the pneumatic butterfly valve will have no effect. Therefore, strict water pressure and air tightness tests must be stopped before the hose leaves the factory.
Reason 2: The wire mesh was broken due to improper installation. In the process of installation, the problem of faulty welding of steel wire occurred when the welding of bellows, ring and wire mesh sleeve was stopped. After the pneumatic butterfly valve device, due to the uneven stress of the steel wire, under the pressure of the medium, the phenomenon of fracture appears, which forms the failure of the white steel stainless steel pneumatic butterfly valve.