Characterization low pressure seal butterfly D343H is closed parts (disc) is a disk around the valve axis to achieve the opening and closing a valve in the main pipeline from the cutting and the throttling effect. Disc driven by the stem, if rotated 90 °, will be able to complete a hoist. Change disc deflection angle, you can control the flow of media. Common butterfly valve wafer type butterfly valve, lug butterfly valve and flange. Butterfly suitable furnace, gas, natural gas, liquefied petroleum gas, city gas, hot and cold air, chemical refining and power generation, environmental protection, building water supply and drainage engineering systems transport all kinds of corrosive, non-corrosive fluids pipeline, and with the for regulating and cutting off the flow of media. Structural features 1, open and close easily and quickly, saving, fluid resistance, you can often operate. 2, simple structure, small size, short length of the structure, small size, light weight, suitable for large-diameter valve. 3, can carry mud accumulation of fluid in the pipe mouth least. 4, low pressure, a good seal can be achieved. 5, regulated performance. 6, when fully open valve effective flow channel larger, smaller fluid resistance. 7, opening and closing torque is small, because the shaft on both sides of the disc that is substantially equal to the role of the media, but in the opposite direction torque is generated, and thus open and close more effort. 8, sealing surface material commonly used in rubber, plastics, so good low pressure sealing performance. 9, easy to install. 10, flexible operation and effort, manual, worm gear, electric, pneumatic, hydraulic control and other means. Design Specification Design Standard: API 609, ASME B16.34, GB / T12238, GB / T12224, JB / T 8527 Structure length: API 609, ASME B16.10, GB / T12221, connection standard: ASME B16.5, ASME B16 .47, ASME B16.25, GB / T 9113, HG / T 20592 inspection and test: API 598, GB / T13927, JB / T9092, GB / T 26480 fire test: API 607 ??Pressure and temperature rating: ASME B16.34 , GB / T 12224 Performance parameters main material: carbon steel, stainless steel, alloy steel nominal diameter: NPS 3 "~ NPS 120" DN80 ~ DN3000 pressure range: CL150 ~ CL1500 PN6 ~ PN250 Working temperature: -196 ℃ ~ + 600 ℃ Applications: for furnace, gas, natural gas, liquefied petroleum gas, city gas, hot and cold air, chemical metallurgy and power generation and environmental protection projects in the transport system on a variety of corrosive, non-corrosive fluids pipeline for adjusting and cut off the flow of media. 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.