Products Description
Gas welded ball valves are valves specifically designed for gas transmission systems. They connect to pipelines via welding and feature high sealing performance, high reliability, and corrosion resistance. Suitable for the transmission and control of gas media such as natural gas, liquefied petroleum gas (LPG), and manufactured gas, they are widely used in urban gas pipeline networks, industrial gas supply, gas-fired power generation, and chemical gas processes, serving as crucial equipment for ensuring the safe operation of gas systems.
Gas welded ball valves drawning
Products Specification
| Product | Gas Fully Welded Ball Valves |
| Nominal diameter | NPS 2", 3", 4", 6", 8", 10", 12", 14", 16", 20", 24", 28", 32", 36", 40", 48 |
| Nominal diameter | Class 150, 300, 600, 900, 1500, 2500. |
| End Connection | Flanged (RF, RTJ), BW, PE |
| Operation | Lever, Worm Gear, Bare Stem, Pneumatic Actuator, Electric Actuator |
| Materials | Forged: A105, A182 F304, F3304L, F316, F316L, A182 F51, F53, A350 LF2, LF3, LF5 Casting: A216 WCB, A351 CF3, CF8, CF3M, CF8M, A352 LCB, LCC, LC2, A995 4A. 5A, Inconel, Hastelloy, Monel |
| Structure | Full or Reduced Bore, RF, RTJ, BW or PE, Side entry, top entry, or welded body design Double Block & Bleed (DBB),Double Isolation & Bleed (DIB) Emergency seat and stem injection Anti-Static Device |
| Design and Manufacturer | API 6D, API 608, ISO 17292 |
| Face to Face | API 6D, ASME B16.10 |
| End Connection | BW (ASME B16.25) |
| MSS SP-44 | |
| RF, RTJ (ASME B16.5, ASME B16.47) | |
| Test and Inspection | API 6D, API 598 |
| Other | NACE MR-0175, NACE MR-0103, ISO 15848 |
| Also available per | PT, UT, RT,MT. |
| Fire safe design | API 6FA, API 607 |
Core Features of Gas Welded Ball Valves
1. Material and Corrosion Resistance
Valve Body Material: Typically made of carbon steel (e.g., WCB), stainless steel (e.g., 304, 316L), or low-temperature steel (e.g., LCB) to adapt to the characteristics and operating conditions of different gas media.
Sealing Material: Uses gas corrosion-resistant sealing materials, such as polytetrafluoroethylene (PTFE), para-polystyrene (PPL), or metal sealing structures to ensure long-term sealing performance.
Anti-corrosion Treatment: The valve body surface can be coated or plated with anti-rust coatings to extend service life.
2. Welded Connection
Connection Method: Butt welding or socket welding is used to ensure a seamless connection between the valve and the pipeline, reducing the risk of leakage.
Advantages: Welded connections are more robust than flange connections, suitable for high-pressure, high-temperature, or buried pipelines, and eliminate the problems of bolt loosening or gasket aging.
3. Structural Design
Floating Ball or Fixed Ball Structure:
Floating Ball: The ball presses tightly against the valve seat under the pressure of the medium, achieving bidirectional sealing, suitable for medium and low-pressure conditions. Fixed Ball: The ball is supported by upper and lower bearings, and the valve seat is automatically compensated by springs or medium pressure, suitable for high-pressure, large-diameter applications.
Fireproof Design: Some valves are equipped with a fireproof sealing structure, maintaining a certain level of sealing even in the event of a fire to prevent secondary accidents caused by gas leaks.
Anti-static Design: Conductive springs are installed between the ball and valve stem, and between the valve stem and valve body, to prevent static electricity accumulation that could cause sparks.
4. Operation and Control
Manual Operation: Equipped with a handle or gearbox, suitable for small-diameter valves.
Electric/Pneumatic Actuator: Enables remote control and automated operation, suitable for large-diameter applications or applications requiring frequent switching.
Limit Device: Ensures the valve is fully open and closed, preventing damage from excessive torque.
5. Performance Advantages
High Sealing Performance: Zero-leakage design, meeting the stringent safety requirements of the gas industry.
High Pressure Resistance: Can withstand pressure ratings up to PN100 (10MPa) or Class 600.
Low-temperature resistance: Some valves are suitable for cryogenic conditions ranging from -46℃ to -196℃, and are applicable to liquefied natural gas (LNG) systems.
Long service life: High-quality materials and precision machining ensure long-term stable operation of the valves under harsh conditions.
Applications of Gas Fully Welded Ball Valves
1. Urban Gas Pipeline Networks
Main and branch lines: Used to control the transmission and distribution of gas, ensuring stable gas supply.
Pressure regulating stations: Used in conjunction with pressure regulators to adjust gas pressure.
2. Industrial Gas Supply
Chemical, metallurgical, ceramics, and other industries: Used to control the flow and pressure of process gases (such as natural gas and coke oven gas).
3. Gas-fired Power Generation
Gas turbine and internal combustion engine gas supply systems: Ensure the reliability and safety of gas supply.
4. LNG and LPG Systems
Liquefied natural gas receiving terminals, storage tanks, and gasification stations: Used for the control and transmission of cryogenic media.
5. Gas-fired Boilers and Heating Equipment
Controlling the gas supply to gas burners to ensure combustion efficiency.
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