A butterfly valve is a valve that uses a circular disc as a starting and closing member and rotates with the valve stem to open, close and adjust the fluid passage. The butterfly valve is not only simple in structure, small in size, light in weight, low in material consumption, small in installation size, small in driving torque, easy to operate and fast, and also has good flow regulating function and closed sealing characteristics in large and medium calibers. In the field of low pressure use, butterfly valves are the dominant valve form. With the application of anti-corrosion synthetic rubber and polytetrafluoroethylene, the performance of the butterfly valve is improved and is satisfied by different working conditions. In the past ten years, metal sealing butterfly valves have developed rapidly. With the application of high temperature resistance, low temperature resistance, strong corrosion resistance, strong erosion resistance and high strength alloy materials in butterfly valves, metal sealing butterfly valves are exposed to high temperature, low temperature and strong erosion. It is widely used under various working conditions and partially replaces the globe valve, gate valve and ball valve. Applicable occasions : Due to the wiping nature of the butterfly valve plate, most butterfly valves can be used for media with suspended solid particles, and can also be used for powdery and granular media depending on the strength of the seal. The butterfly valve has a small structural length and overall height, and has a fast opening and closing speed. When fully opened, it has a small fluid resistance. When it is opened to between about 15 ° and 70 °, it can perform sensitive flow control. Butterfly valve The structural principle of Zui is suitable for making large diameter valves. Under the following working conditions, butterfly valve is recommended: 1 requires throttling, adjusts control flow; 2 mud medium and solid particle medium; 3 requires short valve structure length; 4 requires fast opening and closing speed; 5 pressure difference Smaller occasions.       In the case of special conditions, the throttling adjustment or the strict sealing, or the use of the butterfly valve under the conditions of severe wear and low temperature ( deep cold ) , the special eccentric or double eccentric special butterfly valve of the special design metal sealing belt adjusting device is required. .    The soft sealing butterfly valve is suitable for two-way opening and closing and regulation of ventilation and dust removal pipelines, gas pipelines and waterways of metallurgy, light industry, electric power and petrochemical systems.    Metal-to-metal wire sealed double eccentric butterfly valve is suitable for heating, steam supply, water supply and gas, oil, acid and alkali pipelines, as a regulating and shut-off device. Metal-to-metal surface sealing triple eccentric butterfly valve can be widely used in petroleum, chemical, metallurgy, electric power, food, medicine, water supply and drainage, gas transportation and other fields, in addition to being a large pressure swing adsorption gas separation control valve. Structural features : butterfly valve has the characteristics of simple structure, small size, light weight, low material consumption, small installation size, quick switch, 90 ° reciprocating rotation, small driving torque, etc. It is used to cut off, connect and adjust the medium in the pipeline. With good fluid control characteristics and closed sealing performance. The streamlined design of the disc makes the fluid resistance loss small, which is an energy-saving product. The valve stem is a through-rod structure. After quenching and tempering treatment, it has good comprehensive mechanical properties, corrosion resistance and scratch resistance. When the butterfly valve is opened and closed, the valve stem only rotates and does not perform lifting operation. The packing of the valve stem is not easy to be broken and the sealing is reliable. It is fixed with the cone pin of the butterfly plate, and the overhanging end is designed to prevent the punch-out type, so as to prevent the valve stem from collapsing when the valve stem and the butterfly plate are accidentally broken. Pharmaceutical Prefilled Syringes, we are the specialist of prefilled Syringes, prefilled Syringes With Needle, wholesale high-quality products of Glass Prefilled Syringe R & D from China.Finished prefilled syringes can meet the FDA`s authorised 14-day sterility test and bagging with ETO Sterilization.We have the perfect after-sales service and technical support. Prefilled Syringes Prefillable Syringes,Preloaded Syringes,Prefilled Syringes China Lemon Trading Co.,Ltd , https://www.sterilevial.nl