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Worm Gear Type Full Bore Welding Ball Valve
Product overview
Worm gear type full bore welding ball valve will not have external leakage. Since the valve seat is composed of carbonized Teflon sealing ring and spring, it has strong adaptability to the change of pressure and temperature, and there will be no leakage within the marked pressure and temperature range. The machining process of the ball has advanced computer detector to track and detect, and the machining accuracy of the ball is high. Due to the uneven stress of valve body material and pipeline material, it will not deform due to earthquake and vehicle passing through the ground, and the pipeline is aging resistant. The sealing ring body is made of PTFE with 20% C (carbon) to ensure no leakage (0%).
Product Features
1. The main body and side body are welded together by a girth weld.
2. Automatic submerged arc welding and U-shaped welding groove are adopted for valve body welding. Air cooling or air cooling mode is used for welding. Infrared welding layer temperature control and multiple welding layers are used to ensure the welding quality of welding layer.
3. The ultra narrow gap welding design structure is adopted, which meets the requirements of ASM positive specification for welding process structure free from post weld heat treatment.
4. Special flux is used in welding, which has fine particle size and good slag removal, which can meet the performance of high strength and toughness weld metal.
5. 100% NDT process, and surface hardness test according to NACE sulfur resistance requirements to ensure welding quality.
Execution Standard
Design spec：API 6D、ASMEB 16.34
Pressure-temp：ASME B16.34、API608
Face to Face：ASME B16.10、GB/T 12221
Butt welding end form：ASME B16.25、ASME B31.4/31.8
Test & check：API 598、API 6D、GB/T 13927
Fire resistance test：API 607、API 6FA
Performance Parameter
Nominal diameter：DN150~600mm
Nominal Pressure：PN1.6～2.5MPa
Main materials：WCB、A105、F11、F22
Applicable temperature：-29～200℃
Applicable media：Water, oil, natural gas and acid-base medium, etc
