Structure and Principle of Fully Welded Ball Valves

The valve body is welded from steel pipes into an integral sealed structure. The ball is connected to the driving device through the valve stem, and the opening and closing can be realized by rotating the ball. When opened, the through hole of the ball is consistent with the inner diameter of the pipeline, resulting in small fluid resistance; when closed, the ball fits closely with the valve seat to block the air flow, featuring a simple and efficient structure.

Special Requirements of Natural Gas Pipelines for Valves

• High Sealing Performance: Natural gas is flammable and explosive, and leakage can easily cause safety accidents. Therefore, valves must prevent leakage to avoid energy waste and disasters.

• High Strength and Pressure Resistance: Natural gas is often transported at high pressure, so valves need to withstand high pressure and external forces to prevent rupture and deformation.

• Long Service Life and Reliability: Pipeline construction requires large investment and is difficult to maintain. Thus, valves must operate stably for a long time in harsh environments to reduce replacement frequency.

Adaptation Advantages of Fully Welded Ball Valves

Excellent Sealing Performance

• Valve Seat Sealing: A combination of a carbonized Teflon sealing ring and a disc spring is adopted. The sealing ring fits the ball, and the spring provides continuous pre-tightening force to compensate for changes in the sealing gap, ensuring no leakage.

• Welding-Enhanced Sealing: The valve body and pipeline are welded into a whole, eliminating leakage points in flange and threaded connections, avoiding external leakage caused by loose connections and gasket aging, and improving sealing reliability.

Outstanding Strength and Pressure Resistance

• Structural Mechanics Advantages: The welded valve body has uniform strength, and the stress is evenly distributed under force without stress concentration, which can better withstand high pressure and external forces and reduce the risk of rupture.

• Material Optimization: High-strength steel matching the pipeline is selected and strictly processed, featuring strong toughness and corrosion resistance. It can be optimized according to working conditions to ensure stable operation under high pressure.

Long Service Life and High Reliability

• Reduced Wear: The ball is supported by upper and lower rotating shafts, the medium thrust is transmitted through the support plate, and the valve stem is operated with pure torque, which reduces friction between the ball and the valve seat and prolongs the service life.

• Adaptation to Harsh Environments: The welded structure can resist the impact of earthquakes, settlement, temperature difference, etc. The valve body and pipeline form an integral whole to avoid loosening and deformation of the connection parts.

• Safety Design: It has fireproof and antistatic functions, maintaining sealing during a fire and eliminating static electricity to reduce the risk of combustion and explosion.