CB/T3945-2013 Flange cast steel stop valve with bellows 

The piping tool accessories stop valve forms a metal barrier between the fluid medium and the atmosphere through automatic rolling welding. The pipe fitting accessories ensures the zero leakage design of the valve stem. The bellow stop valve adopts a corrugated pipe structure inside, and the lower end of the stainless steel corrugated pipe is welded on the valve stem through a stainless steel gasket to prevent the process fluid from corroding the valve stem. The other end is placed between the valve body and bonnet to form a static seal. Double seal design is adopted. If the Air Pipe Head fails, the stem packing will also prevent leakage. Bellows are welded on the valve stem to maintain stable operating performance and avoid valve stem vibration caused by valve disc vibration. Jis Air Pipe Head globe valve adopts a special bellows seal design, which solves the problem of valve stem packing seal leakage, meets the most stringent leak…