Welded Ball Valves

Welded ball valve is a ball valve that connects key components (such as the ball and valve body, valve stem and valve body, etc.) by welding. The opening and closing or flow control of the pipeline medium is achieved by rotating the ball with a through hole. It is divided into two types: fully welded (all parts are welded and connected, without leakage risk) and semi-welded (partial welding + detachable connection).
‌Core structural features‌:
‌Welding connection‌:
‌Fully welded valve body‌: The valve body is welded to the pipeline as a whole, without bolts or flange interfaces, and has extremely strong sealing, which is suitable for high-pressure and high-risk media (such as natural gas and oil).
‌Semi-welded design‌: The valve body is partially welded + flange connection, taking into account both sealing and detachability.
‌Ball design‌:
‌Floating ball‌ (suitable for small diameter): The ball presses the sealing ring tightly under the medium pressure to achieve sealing.
‌Fixed ball‌ (suitable for large diameter/high pressure): The ball is fixed by the upper and lower shafts, the sealing ring is pre-tightened, and the pressure resistance is stronger. ‌

Sealing type: Soft seal (PTFE/reinforced graphite): zero leakage, applicable temperature -40℃~200℃, strong corrosion resistance.

Hard seal (metal/ceramic): resistant to high temperature (≤550℃) and particle erosion, suitable for impurity-containing media.

 

Welded Ball Valves

 

Advantages

High-strength sealing:
Welding eliminates the risk of flange interface leakage, especially suitable for harsh working conditions such as natural gas and chemical industry.
The hard seal structure can withstand high pressure ≥PN6.4MPa, and the soft seal achieves zero leakage (ANSI VI level).
‌Corrosion resistance and long life:
The valve body material can be stainless steel (316L), carbon steel (WCB) or alloy steel (WC6), which is suitable for corrosive media such as acid, alkali and salt.
The fully welded structure has no active bolts, reduces corrosion points and prolongs service life (up to 30 years).
‌Lightweight and space saving:
Compared with flange ball valves, the welding design reduces the weight of the connector and is suitable for pipeline layouts with limited space (such as submarine pipelines).

Applications

Oil and gas transportation: high-pressure natural gas cut-off in long-distance pipelines and LNG stations.
‌Chemical and petrochemical: process control of highly corrosive media (such as sulfuric acid and liquid ammonia). ‌Electricity and heating‌: Fully enclosed and cut-off of high-temperature steam pipelines and thermal networks.
‌Municipal engineering‌: Permanent connection of underground water supply and heating networks.

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