Technical Specifications:
◎ Materials: Forged Carbon Steel, Stainless Steel, Duplex, Inconel, Alloy Steel
◎ Size Range: NPS 1"–24" / DN 25–600
◎ Pressure Class: ASME Class 150–2500 / PN 10–420
◎ Temperature Range: -60°C to +250°C
◎ Seat Options: PTFE, RPTFE, NYLON, DEVLON, Metal-to-Metal
◎ End Connections: RF, BW
◎ Standards: API 6D, ASME B16.34, BS 5351
◎ Applications: Oil and gas pipelines, petrochemical processing, LNG, power generation, and urban infrastructure.
Naishi Fully welded underground ball valve is mainly used for pipeline connections and flow regulation in industrial processes. The underground ball valve can be installed directly underground, without the need for a control room. The entire structure of the underground ball valve is designed for underground use, and it can be operated manually or by an actuator. It is simple and convenient for operation, especially in urban gas pipeline networks and distribution stations.
Key Features
Fire-safe Design
Dual-seal structure meets API 607/BS 6755. Metal seat ensures sealing under high temperatures.
Anti-static Design
Spring and ball create a static discharge path to prevent fire or explosion risks.
Emergency Sealing & Lubrication
Grease injection allows quick sealing and smooth operation during maintenance or leakage.
Flexible Seat Design
Supports single or double piston seats for DBB and automatic or manual pressure relief.
ISO Mounting Pad
Complies with ISO 5211 for easy actuator installation
Extended Stem
For underground use, stem and accessories can be extended for ground-level maintenance.
Extended Bonnet
Prevents low-temperature effects on seals; length customizable.
Low Torque Operation
Forged body with polished ball and self-lubricating bushings ensures easy actuation.
Reliable Welding
Submerged arc welding with 100% UT and hardness testing ensures joint strength.
Finite Element Analysis
Optimized valve design through stress and torque simulations for reliable performance.
