Packing seal structure have?

packing seal is packing in a pneumatic valve rod between the letter, to prevent the leakage of medium to a dynamic seal structure. Packing seal structure has a gland type, o-ring type, corrugated pipe, such as class, according to the packing, Box) Internal structure can be divided into general type, within the split ring, tight type, etc. According to the use of packing materials can be divided into metal filler, filler metal and composite materials. Different definitions to subdivide packing many kinds. Is currently the most used pneumatic valves, compression packing, it is according to the different conditions of use, the combination of various materials made of rope, the seal ring. In recent years, there was a kind of flexible graphite packing and ptfe expansion, it has very excellent performance, more and more application in the pneumatic valve packing. If choose the appropriate packing is an important factor to satisfy different working conditions, then packing installed correctly is the guarantee that give full play to the ability of the decision factors.