Heavy-Duty Fully Welded Ball Valve for Pipeline Shut-Off
Discover our top-entry fully welded ball valve designed for critical pipeline isolation. Zero-leakage, fire-safe design, and maintenance-free body ensure reliable performance in high-pressure gas transmission.
Description
In critical infrastructure such as long-distance transmission pipelines, city gas networks, and high-pressure gas storage facilities, the reliability and safety of valves directly impact the overall operational efficiency and public safety. For these demanding applications with stringent “zero-leakage” requirements, the Fully Welded Ball Valve, with its integrally welded structure and unparalleled sealing performance, has become the industry-recognized ideal pipeline isolation device.
Elimination of Potential Leak Points and Zero Maintenance on the Body
Unlike traditional flanged-end ball valves, large-diameter Fully Welded Ball Valves feature a Fully Welded Ball Valve Body design. The valve body is constructed by precision welding of the two end connectors and the center section, completely eliminating flanges, gaskets, and bolted connections. This design eradicates the risk of external medium leakage and effectively avoids bolt loosening caused by temperature fluctuations or pipeline vibration. For the transmission of flammable and explosive media such as natural gas and crude oil, products supplied by such a Fully Welded Ball Valve Supplier significantly reduce fire hazards and meet the most stringent safety and environmental regulations.
Meeting the High Standards of Long-Distance Pipelines
The design, manufacturing, and testing of large-diameter Fully Welded Ball Valves strictly comply with API 6D (Pipeline Valve Specifications) and ISO 14313 standards. The Fully Welded Ball Valve Design typically adopts a Trunnion Mounted Ball Valve structure, where the ball is supported by upper and lower stems, transferring the tremendous thrust generated by high pressure to the valve body bearings. This design ensures stable, low-torque operation even under high differential pressure, and the sealing surfaces are less prone to scoring even under high-intensity, frequent switching actions. This makes the valve series ideally suited for critical positions such as long-distance transmission pipelines, compressor station inlet/outlet, and tank root valves. Its Full Bore Ball Valve feature facilitates smooth passage of pipeline pigs, ensuring pipeline maintenance and operational needs.
Fully Welded Ball Valve Parameters
| Parameter | Specification |
|---|---|
| Nominal Diameter | DN 150 ~ DN 1400 (NPS 6 ~ NPS 56) |
| Pressure Class | Class 150 ~ Class 2500 (PN 16 ~ PN 420) |
| Body Material | Carbon Steel (ASTM A105 / A350 LF2 / A216 WCB / LCC) |
| Ball / Stem Material | Stainless Steel (AISI 304 / 316 / F6a, etc.) |
| Seat Material | Reinforced PTFE, Nylon, PEEK, or Metal Hard-Seat (Inconel / Stellite) |
| Connection Type | Butt-weld ends or Flanged ends |
| Actuation | Manual (gear operator), Pneumatic, Electric, Hydraulic |
| Operating Temperature | -46°C ~ +200°C (depending on material selection) |
Sealing and Fire Safety Assurance under Severe Conditions
For high-temperature, high-pressure, or media-containing-particle applications, we offer Metal-Seated Fully Welded Ball Valves. The seat and ball surfaces are treated with processes such as supersonic flame spraying of tungsten carbide or hardfacing with Stellite alloy, providing excellent galling resistance and corrosion resistance. All large-diameter Fully Welded Ball Valves are standardly equipped with API 607 / ISO 10497 fire-safe structure, ensuring that in extreme fire accidents, even after the soft seals of the seat and stem are burned away, the metal-to-metal secondary sealing can still effectively control external medium leakage.
