Characterization hard seal DIN Ball is a sphere with a circular through hole as opening and closing pieces, the stem driven ball 90 degrees around the center of rotation of the stem, complete opening and closing function. According to the form structure ball, there are two floating ball and fixed ball; according to valve material, mainly steel ball valve, forged steel ball two; the characteristics of the ball valve sealing surface, there are soft sealing valve 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 connected line of medium, widely used in petroleum refining, long-distance pipelines, chemical, paper, pharmaceuticals, water conservancy, power, 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 and the like in the design for a special consideration for a variety of corrosive and non-corrosive media. Choice of different materials, can be separately applied to transport water, steam, oil, natural gas, acetic acid, oxidizing medium, urea. Compact valve structure, reliable sealing, often spherical surface and seal in the closed state, can not easily be medium erosion, easy operation and maintenance. Structural features 1, the ball valve in the fully open and fully closed, the ball and seat sealing surface and the dielectric isolation, so the speed of the medium through the valve without causing erosion of the sealing surface; 2, valve structure is simple, good sealing, opening and closing torque is small; 3, with the lowest flow resistance (real close to zero); 4, necking or full bore; 5-flanged or butt weld end faces; 6, soft-seated ball valves have a fire anti-static devices; 7, the valve pole for the BOP designed to prevent improper operation caused by the exhaust valve stem from the valve body; 8, a disk drive capable of supporting a variety of connected devices. Drive means includes a handle, worm gear, electrical, pneumatic, gas-liquid interaction, electro-hydraulic linkage; 9, convenient location adjustment. When replacing or installing actuators line, you can not see the ball hole location, DAYU ball valve offers a special "detents", can be very easily and accurately find the valve fully open and fully closed position. To facilitate the implementation of the adjustment mechanism limiting devices; 10, for the ends of the valve welded connections, can respond to the pipe grades according to the user to adjust the valve end of the material (transition) to ensure the suitability of the material strength and weldability. Sleeves at both ends of the valve, the length of the sleeves can guarantee spot welding operation does not affect the sealing material; 11, buried design. Underground installation of the valve stem extended according to needs of the project so that the ground operation, and the corresponding grease, sewage and vent means an extension of the pipe to the ground. Design specifications Design Standards: ISO14313 / API 6D, API 608, BS 5351, GB / T 19672, GB / T 12237 Structure length: 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 stations, construction of water supply, low temperature conditions as well as oil, gas, natural gas and other long-distance pipelines. Usually prompts customers as the products have special requirements, shall provide the following description in the contract:.... A length of the structure; b connection form; c nominal diameter, full bore, reduced in diameter pipe sizes; d use of 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 of the model and requirements contracts under the same conditions of supply and demand sides understand.