3PC Butt Welded Trunnion Ball Valve

3PC Butt Welded Trunnion Ball Valve

• Three-Piece Body Construction: The valve body is split into left body, right body and central body, facilitating on-site in-line maintenance and internal component replacement without complete valve disassembly from pipeline.

• Trunnion Mounted Ball Design: The ball is secured by upper and lower trunnion shafts; medium pressure is borne by valve seats instead of the ball, avoiding ball shifting and making the valve ideal for high-pressure and large-size applications.

• Butt-Weld End Connection: End dimension complies with ASME B16.25 standard to form permanent high-integrity welded joints.

• Dual-Seat Construction: Seats adopt Double Piston Effect (DPE) or Single Piston Effect (SPE) structure to realize bidirectional or unidirectional sealing performance respectively.

• Fire-Safe Construction: Designed and certified per API 6FA and API 607, maintaining metal-to-metal sealing upon fire accident to prevent hazardous medium leakage.

• Anti-Static Device: Built-in anti-static springs and steel balls guarantee continuous electrical conduction among ball, stem and body to avoid static charge accumulation.

• Anti-Blowout Stem Design: A shoulder structure is arranged at stem bottom to lock the stem in position and prevent stem ejection under abnormal surge pressure.

• Low Operating Torque: Matched with precision bearings under trunnion ball layout, the valve features low operational torque and is compatible with smaller-size actuators.

• Emergency Grease Injection System: Grease fittings are installed on seats and stem; sealing grease can be injected emergently to restore sealing performance once seal failure occurs.

  
  

• Oil & Natural Gas: Used for shutoff and bypass control at long-distance transmission pipelines, gathering stations, compressor stations and underground gas storage facilities.

• Chemical Industry: Provides medium isolation for high-pressure reaction systems, high-temperature cracking units and polymerization plants under rigorous working conditions.

• Power Industry: Applied for regulation of steam, feedwater and fuel piping systems in thermal power, nuclear power and new energy power stations.

• Coal Chemical Industry: Equipped on high-pressure coal slurry and syngas delivery pipelines for coal gasification, ammonia synthesis and methanol production units.

• LNG & LPG Service: Suitable for cryogenic high-pressure working conditions of LNG receiving terminals and LPG storage & transportation systems.

• City Gas Distribution: Realizes high-pressure natural gas cut-off and flow allocation at city gate stations, pressure regulating stations and distribution stations.

• General Industrial Service: Delivers reliable isolation for large-bore high-pressure pipelines carrying steam, fuel oil and various chemical process fluids.

  
  

• Superior Pressure Withstanding Capacity: Trunnion ball structure eliminates medium thrust load on the ball, enabling stable service up to Class2500 high pressure and securing whole pipeline operational safety.

• Leak-Free Permanent Welded Joint: Butt-weld construction removes gasket leakage risks of flange connection, suited for underground buried piping, overhead installation and vibration-intensive environments with maintenance-free permanent joint performance.

• Reliable Bidirectional Sealing: Double Piston Effect seat design achieves genuine bidirectional zero-leakage regardless of medium flowing direction.

• Easy In-Line Maintenance: Three-piece split body enables seat and seal replacement without removing entire valve from pipe, greatly shortening equipment downtime and production loss.

• Full Bore & Low Flow Resistance: Full bore internal design minimizes fluid resistance and pressure drop, permitting smooth pigging operation via pipeline.

• Excellent Automation Compatibility: Low torque characteristic matches multiple actuator types for easy remote control and automatic pipeline management.

• Ultra-Long Service Lifespan: Critical moving parts adopt surface hardening plus premium sealing materials to achieve service life over 20 years.

• Optimized Total Cost of Ownership: Despite higher initial procurement cost versus floating ball valves, its extremely low maintenance expense throughout service cycle brings remarkable TCO (Total Cost of Ownership) superiority.