A fully welded ball valve, also known as a welded body ball valve, is a robust and reliable valve designed to ensure no external leakage from the valve body. The fully welded construction of the valve body, performed according to ASME Section IX standards, eliminates potential leak paths, providing maximum strength and resistance to pipeline pressures and stresses. Non-destructive tests are conducted to ensure the integrity of the welding processes.
1. Construction: Typically made from forged steel, the valve body is constructed by welding all parts except the stem housing, eliminating the need for sealing elements that could cause leakage.
2. Inspection and Maintenance: These valves can be inspected and maintained on a live line, enhancing operational efficiency.
3. Certifications and Standards: They are SIL 2 & 3 certified and can be manufactured from special materials according to NACE corrosion standards and temperature classes. The standard quality level is QSL2 according to API 6D, with options for higher quality levels and special materials.
4. Applications: Primarily used in natural gas and crude oil pipelines, these valves are suitable for both above-ground and underground applications, typically operating between -46°C to 100°C.
1. Strength and Weight: The fully welded design offers maximum strength with minimal weight and high resistance to pipeline pressures and stresses. The compact, spherical design reduces the overall size and eliminates body flanges, minimizing potential leak paths.
2. Ideal for Buried Services: These valves are perfect for buried service applications, reducing potential leak points and the risk of fugitive emissions from flanges.
3. Trunnion Mounted Design: Featuring trunnion-mounted, high-strength forged stems located in PTFE-impregnated stainless steel bearings, these valves ensure smooth operation. The trunnion-mounted stems absorb thrust from line pressure, preventing excess friction between the ball and seats, keeping operating torque low even at full rated working pressure.
Fully welded ball valves are critical components in gas transmission and distribution pipelines, offering unparalleled reliability and performance for demanding applications.
As a global leading ball valve manufacturer, KAMROO would be pleased to advise you individually, and you are also welcome to send your inquiry to info@kamroo.com.
