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Gas Hydraulic Actuated Fully Welded Ball Valve

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Gas‑Hydraulic Actuated Fully Welded Ball Valve is a high‑performance fully welded ball valve designed specifically for long‑distance pipelines, high‑pressure natural gas transmission and severe operating conditions. The valve adopts an integral fully welded body structure to completely eliminate external leakage risks, and is equipped with a gas‑hydraulic actuator to realize remote automatic control and emergency shutdown functions. It is especially suitable for critical infrastructure such as natural gas long‑distance pipelines, urban gas systems, gas storage reservoirs and offshore platforms, ensuring the safety and reliability of medium transportation.
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Design Features

  • Fully Welded Body Structure:The valve body adopts an integral forging fully welded design without body flanges, completely eliminating external leakage points, making it suitable for buried installation and maintenance-free service.

  • Gas-Hydraulic Actuator:Uses pipeline natural gas as the power source combined with a hydraulic control system to realize automatic valve operation and emergency shutdown without external power supply.

  • Trunnion-Mounted Ball Design:The ball is fixed by upper and lower support shafts, ensuring stability under high differential pressure conditions, reducing operating torque and extending service life.

  • Double Piston Effect Seat (DPE):The seat is designed as a DPE structure to achieve bi-directional sealing. In case of upstream or downstream seal failure, medium pressure pushes the seat tightly against the ball to ensure reliable sealing.

  • Dual Sealing System:Primary sealing uses high-performance polymers (such as PTFE/nylon), and secondary metal sealing provides fire-safe redundancy in compliance with API 6FA/6FB standards.

  • DBB/DIB Function Optional:Double Block & Bleed (DBB) or Double Isolation & Bleed (DIB-1/DIB-2) structures are available to meet pipeline isolation and pressure relief testing requirements.

  • Blowout-Proof & Anti-Static Stem:The stem features an integrally forged blowout-proof structure with a built-in anti-static device to ensure operational safety and explosion-proof requirements.


Technical Specifications

  • Size Range: NPS 2″ to 56″ (DN50 to DN1400)

  • Pressure Rating: Class 150 to Class 2500 (PN20 to PN420)

  • Temperature Range: -46℃ to +425℃

  • Body/Ball: ASTM A105, A350 LF2, A182 F304/F316, F51/F53 Duplex Stainless Steel

  • Stem: 17-4PH, A182 F316

  • Sealing Materials: PTFE, Nylon, PEEK, Metal Hard Seal

  • End Connections: Fully Welded Ends (BW), Flanged Ends (RF/RTJ)

  • Actuators: Gas-Hydraulic, Manual, Electric, Pneumatic (Optional)

  • Design Standards: API 6D, ASME B16.34

  • Test Standards: API 6D, API 598


Applications

  • Natural Gas Long-Distance Pipelines: Used for block valves, pig launching/receiving and line segment isolation on main and branch pipelines to ensure safe network operation.

  • Underground Gas Storage: Key shutoff equipment for injection-production wells and gathering stations, adapting to high-pressure and high-frequency switching conditions.

  • Offshore Platforms & LNG Facilities: Reliable medium control in marine and low-temperature environments, meeting explosion-proof and maintenance-free requirements.

  • Petroleum & Chemical Industry: Isolation of high-pressure, high-temperature and corrosive media in refineries and chemical plants.


Advantages & Value

  • Zero-Leakage Reliability: Fully welded body completely eliminates external leakage risks, and the gas-hydraulic system ensures fast response in emergencies, protecting life, property and the environment.

  • High Automation: Gas-hydraulic actuator realizes local/remote control, pressure drop rate monitoring, pipeline rupture emergency shutdown and other intelligent functions, improving pipeline operation efficiency.

  • Extreme Service Adaptability: Stable performance under high-pressure, low-temperature, high-frequency and corrosive media conditions, reducing unplanned downtime and replacement costs.

  • Combination of Standardization & Customization: Strict compliance with international standards ensures interchangeability, while customized solutions such as buried depth, connection types and control logic are available based on project requirements.

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