Pneumatic ESD Plug Valve – 3" x 3" FIG 1502 Male (Wing) x Female (Thread) | Sour Service (H2S)

The Pneumatic Actuated ESD Plug Valve, 3" x 3" FIG 1502 Male (Wing) x 3" FIG 1502 Female (Thread) for Sour Service, is a massive, highly specialized flow control and safety component engineered for large-bore treating lines operating in toxic H2S environments. Designed specifically as an Emergency Shutdown (ESD) device, this large-capacity quarter-turn valve integrates a heavy-duty, corrosion-resistant forged steel valve body with a rapid-response pneumatic actuator. This critical safety combination provides operators with the ability to instantly isolate large-volume flowlines from a remote distance during hazardous gas leaks, blowouts, or severe pressure spikes.

Operating in sour gas (H2S) environments subjects high-pressure flowline iron to severe risks of hydrogen embrittlement and Sulfide Stress Cracking (SSC). To guarantee maximum safety, the entire valve body and internal wetted components are forged from premium alloys and strictly heat-treated to comply with NACE MR0175 / ISO 15156 performance standards. This safely maintains a continuous 10,000 PSI cold working pressure (the established industry safety derating for 1502 sour service iron).

The large-bore 3" FIG 1502 configuration features an integral male wing end complete with a heavy-duty wingnut, paired with a precision-machined female thread (sub) connection. Powered by rig air or compressed nitrogen, the pneumatic actuator executes an automated fail-safe shutdown, ensuring the well or pump is immediately isolated even if the control signal is lost in a lethal gas zone.

Features & Benefits

• Sour Service Compliant: Forged from specialized alloys and strictly heat-treated to comply with NACE MR0175 / ISO 15156 standards for safe operation in hazardous H2S environments.

• Pneumatic ESD Actuation: Equipped with a heavy-duty rapid-response pneumatic actuator for remote-controlled emergency shutdown, completely removing personnel from toxic, high-pressure danger zones.

• 10,000 PSI Sour Service Rating: Safely and continuously handles extreme working pressures up to 10,000 PSI (10K CWP), the established safety rating for FIG 1502 sour gas iron.

• Large-Bore Efficiency: The full 3-inch bore size accommodates massive volumetric flow rates, critical for high-capacity stimulation and well testing streams.

• Fail-Safe Reliability: Engineered to instantly fail to a designated safe position (typically fail-close) upon the loss of pneumatic supply pressure, preventing uncontrolled toxic blowouts.

Specifications & Technical Details

Applications

This large-bore pneumatically actuated 3-inch ESD plug valve is a mandatory safety asset for high-pressure, high-volume surface operations requiring automated flow isolation in toxic gas zones. Typical applications include massive sour choke and kill manifolds, sour frac iron mainlines, toxic high-rate well testing separators, automated H2S flowback packages, and pump discharge headers exposed to corrosive media.

Quality Assurance

All our sour service actuated valves undergo rigorous quality control and non-destructive metallurgical verification. The forged bodies are strictly tested for hardness to guarantee maximum resilience against Sulfide Stress Cracking. The completely assembled unit undergoes exhaustive actuator function and cycle testing at full pressure to verify fail-safe response times and bubble-tight seal seating. Full material traceability (MTRs) and NACE certificates are available upon request.

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