Analysis and Research on the Ball of Fixed Pneumatic Ball Valve The fixed pneumatic ball valve is characterized by small switching torque, fast switching, small flow resistance coefficient, fire prevention, anti-static, automatic valve body discharge, etc. It is especially suitable for high pressure, high temperature and large diameter pipelines, and is widely used in various fields of production and life such as natural gas, oil products, chemical industry, metallurgy, urban construction, environmental protection, etc. The fixed pneumatic ball valve consists of valve seat, pneumatic ball valve, upper and lower valve stems, valve body and other parts

Advantages of cloth clamping hose
The surface of the glue coated hose is intact, which indicates that the full flame retardant scheme is not only flame retardant, but the fabric layer cannot play a flame retardant role, and the flame retardant of the outer glue is too large. The flame retardant cloth hose of our company is not only safe, but also cheap. Generally speaking, the local flame retardant scheme has the following advantages
The cost of materials used is relatively low. The cost of materials in Scheme I can be reduced by 1.512 yuan/meter. Flame retardant is not added to the inner rubber and fabric layer, which avoids the impact of flame retardant on the physical properties of rubber and reduces the corrosion of fabric layer by flame retardant
The inner rubber layer is made of non flame retardant rubber material, which greatly reduces the impact of toxic substances on the escort medium. The natural rubber is neoprene, a polymer with high oxygen index. Due to the presence of chlorine, it has the characteristics of self extinguishing. Under the heating condition, HCL gas is released first, and then the heat reaction at 377 generates cross-linking. It extinguishes coking and generates an insulation layer with sufficient thermal stability, So as to reduce the attack of combustible gas
However, its biggest defects are its high price and poor process performance. To compensate for its lack, we can use BR or NR to improve it. The properties of the compound are shown in Table 3. The tensile strength of o3CR/2R, CR/NR and ceramic clay and the sulfur antioxidant D Laomalon stearic acid resin carbon black flame retardant, yPa elongation,% breaking permanent deformation,% hardness (Siel type, degree) Surface resistance and flame from Fraunhofer time