Vacuum resistance: for pneumatic ball valves with nominal inner diameter less than 300mm and working pressure more than 1.6Mpa, the vacuum resistance shall not be less than 100Kpa. For valves of other specifications, the vacuum of the forehead shall be specified by the agreement between the supplier and the demander. Safety evaluation of pneumatic ball valve used in domestic drinking water system: safety of pneumatic ball valve used in domestic drinking water system When flat angle pneumatic ball valve is used in domestic drinking water system, the water quality after passing the product shall comply with GB/T5749 Sanitary Standard for Drinking Water and GB/T17219 Safety Evaluation Standard for Drinking Water Transmission and Distribution Equipment and Protective Materials Relevant regulations and requirements. Requirements for metal flange and flat union: metal flange shall meet the requirements of GB/T9119, and flat union shall meet the requirements of GB/T3289.37.
Requirements when the end face of pneumatic ball valve is reinforced with steel wire rings: when the end face of pneumatic ball valve is reinforced with steel wire rings, the steel wire rings shall be round and located in the same plane in the same year. The difference between pneumatic ball valve and pneumatic ball valve: what is the difference between pneumatic ball valve and pneumatic ball valve? The two seem very similar, but their functions are different.
Stainless steel metal hose, also known as metal hose, pneumatic ball valve and stainless steel hose, has good flexibility, temperature resistance, pressure resistance and corrosion resistance, and is suitable for transmission of steam, water, oil and various industrial gases and other media. The pneumatic ball valve ball is composed of a valve pipe with multiple layers of rubber scraped nylon cord fabric and outer rubber layer in the inner rubber layer and reinforcement layer. The valve materials used vary according to the media, including natural rubber, styrene butadiene rubber, butyl rubber, butyl rubber, EPDM, neoprene rubber, silicon valve, fluorine valve, etc. It has the functions of heat resistance, acid resistance, alkali resistance, corrosion resistance, wear resistance, oil resistance, etc. The pneumatic ball valve plays an important role in the movement of the pipeline system, thermal expansion absorption, vibration absorption. The model length and connection method of the pneumatic ball valve are based on the user's requirements. The expansion joint (expansion joint) is mainly used to compensate for the expansion deformation of the pipeline due to temperature changes, and also for the length compensation of the pipeline due to installation and adjustment. It is mainly divided into three structural forms: elbow expansion joint, bellows expansion joint and sleeve expansion joint. Elbow expansion joint is an expansion joint that bends the pipe into a U shape or other shape (Figure 1 [Elbow expansion joint]) and compensates with the elastic deformation capacity of the shape. It has the advantages of good strength, long service life, and can be made on site. Its disadvantages are that it occupies large space, consumes more steel and has large friction resistance. This expansion joint is widely used in various steam pipelines and long pipelines.