As industrial infrastructure continues to demand higher levels of safety, reliability and lifecycle performance, valve manufacturers are expected to provide solutions capable of operating under the most challenging service conditions. VIS VANA has developed its Fully Welded Ball Valve series to meet these expectations in transmission pipelines, district heating networks, power plants, LNG terminals and other critical industrial applications.
Unlike conventional bolted body ball valves, the fully welded body design eliminates potential external leakage paths while significantly increasing structural integrity. The welded construction also reduces maintenance requirements throughout the service life and improves resistance against vibration, thermal expansion and external mechanical loads.
The valve is designed in accordance with API 6D and can be supplied in pressure classes ranging from ASME Class 150 to Class 2500, with sizes extending to DN1200 (48") depending on project requirements. Various body materials including carbon steel, stainless steel, duplex and super duplex stainless steels are available for corrosive and severe service environments.
A floating or trunnion-mounted ball design can be selected according to operating conditions. Soft seated and metal seated configurations are available, enabling reliable shut-off in both standard and high-temperature applications. Fire-safe construction, anti-static devices, double block and bleed functionality, emergency sealant injection systems and stem extension options are available upon request.
Each valve undergoes comprehensive hydrostatic and seat leakage testing before shipment. Additional qualification tests such as fire testing, fugitive emission testing, low-temperature testing, high-temperature testing and third-party witness inspections can also be performed according to customer specifications.
With more than four decades of manufacturing experience, VIS VANA integrates its own foundry, machining, assembly, coating and testing facilities, ensuring complete control over quality throughout the production process. This vertically integrated manufacturing capability enables shorter lead times while maintaining high international quality standards.
The Fully Welded Ball Valve has been developed to provide long-term operational reliability for modern energy infrastructure where safety, durability and maintenance-free operation are essential performance requirements.
