Characterization of high quality forged steel flanges Q347F stationary ball is a sphere with a circular through hole as opening and closing pieces, the stem around the stem center driven ball rotated 90 degrees to complete the opening and closing function. According to the form of the structure of the ball valve, the main valve floating ball and fixed two; According ball material, mainly steel ball valves, forged steel ball two; according to the characteristics of the ball valve sealing surface, there are soft seated ball valves and metal seal Ball two kinds; according to ball valve structure, there are split valve, ball valve tops and fully welded ball valve three. Ball used to cut off or turn on the line of medium, widely used in petroleum refining, long-distance pipelines, chemical, paper, pharmaceuticals, water, electricity, municipal, steel, etc., particularly in the oil, natural gas, oil depots national reserve and the refinery cracker widely used. Its strength, safety, resistance to harsh environments, such as in the design of special considerations were applied to a variety of corrosive and non-corrosive media. Choice of different materials, respectively for conveying water, steam, oil, natural gas, nitric acid, acetic acid, oxidizing medium, urea. Compact valve structure, reliable sealing, sealing surface and spherical often in the closed state, can not easily be medium erosion, easy operation and maintenance. Structural features a ball valve in the fully open and fully closed, the ball and seat sealing surface and the dielectric isolation, and therefore high speed through the media does not cause the valve sealing surface erosion; 2, valve structure simple, sealing, opening and closing torque is small; 3, with the lowest flow resistance (actually close to zero); 4, necking or full bore; 5, flanged or butt weld end face; 6, soft-seated ball valves have the fire of anti-static devices; 7, valve rod for BOP design prevents the stem caused by improper handling ejected from the valve body; 8, a disk drive capable of supporting a variety of connection devices. Driving device includes a handle, worm gear, electric, pneumatic, gas-hydraulic, electro-hydraulic linkage; 9, convenient position adjustment. When replacing or installing actuators online, you can not see the ball hole location, DAYU ball with a special "detents" that can be very easily and accurately find the valve fully open, fully closed position. Facilitate the implementation of the adjustment mechanism limiting device; 10, to the ends of the valve welded connections, can respond to the pipe grades according to the user to adjust the valve ends of the material (the transition section), in order to ensure the suitability of the material strength and weldability. Both ends of the sleeves of the valve plus, the length of the sleeves of the scene to ensure the welding operation does not affect the sealing material; 11, buried design. Underground installation of the valve stem lengthened according to needs of the project, in order to operate on the ground, and the corresponding greasing, by extension of the sewage system and vent pipe to the ground. Design Specification Design Standard: ISO14313 / API 6D, API 608, BS 5351, GB / T 19672, GB / T 12237 length of the structure: ISO14313 / API 6D, ASME B16.10, GB / T 12221 connection standard: ASME B16.5, ASME B16.47, GB / T 9113, JB / T 79, HG / T 20592 HG / T 20615 fire protection requirements: API 6FA, API 607 ??Pressure test: API 6D, API 598, GB / T 13927, GB / T 26480, JB / T9092 standard temperature and pressure: ASME B16.34, GB / T 12224 Performance parameters main material: carbon steel, stainless steel, alloy steel nominal diameter: NPS1 / 2 "~ 60" DN15 ~ DN1500 Pressure range: Class150 ~ 2500 PN10 ~ PN420 Working temperature: -196 ℃ ~ + 600 ℃ Application: petroleum, chemical, metallurgy, light industry, power plants, construction of water supply, low temperature conditions and oil, gas, natural gas and other long-distance pipelines. Order prompt a customer if the product has special requirements, must provide the following description in the contract:.... A length of the structure; b connection form; c nominal diameter, full bore, necking, pipe size; d use media and temperature and pressure range;. e testing, inspection standards and other requirements. Second, the factory can configure various types of drives according to customer specific requirements. Third, as provided by the customer to determine when the valve type and model, the customer should correctly explain the meaning and requirements of the model, both parties sign a contract under the same conditions to understand.