API6D Explosion-proof Pneumatic Forging Steel Flanged Ball Valve

Product Overview

API6D Explosion-proof Pneumatic Forging Steel Flanged Ball Valve

Applicable Standards:
Ball  Valve design according to API6D,BS5351,ASME B16.34
Face to face ASME B16.10,API6D
End Flanges ASME B16.5/ASME B16.47
Butt welded ends ASME B16.25
Fire Safety API607,API6A
Inspection and test API 598,API6D

Product Parameters

Design Description & Engineering Features

API 6D Standard Compliance: Manufactured and tested strictly to API 6D, ASME B16.34, and API 608 specifications. Every dimension is machined to precise tolerances, ensuring global interchangeability and absolute safety during installation and prolonged operation.

Advanced Seat Design (DBB & DIB): Equipped with independent spring-loaded seats that provide simultaneous upstream and downstream sealing, enabling classic Double Block and Bleed (DBB) functionality for safe cavity venting. To further elevate pipeline isolation safety, we offer Double Isolation and Bleed (DIB-1/DIB-2) and Double Piston Effect (DPE) seat configurations. These self-relieving seat designs automatically vent excess cavity pressure caused by thermal expansion, protecting the valve body from catastrophic overpressure.

Emergency Sealant Injection: Features precisely machined secondary sealant injection fittings for both the stem and seats. In the event of minor scoring or debris damage to the primary soft sealing rings, maintenance crews can inject specialized sealant compounds to instantly restore sealing integrity without halting pipeline operations or removing the valve from the line.

Comprehensive Safety & Environmental Compliance: Certified to API 607/API 6FA, the fire-safe design utilizes secondary metal-to-metal contact to maintain a secure seal even if the primary soft seats are destroyed by extreme heat. Internal grounding mechanisms provide continuous static discharge. Furthermore, the architecture incorporates an Anti-Blowout Stem—an internally inserted stem with a retaining shoulder that physically prevents ejection under sudden pressure surges. For sour gas applications, materials strictly comply with NACE MR0175 standards, while the entire assembly is designed to meet API 641 low fugitive emissions standards, satisfying modern environmental mandates.

Structural

1. Forged steel valve body Body is integrally forged from alloy / carbon steel bar stock, no casting porosity or sand hole defects. High mechanical strength, good pressure‑bearing performance for critical process pipelines.

2. Floating ball or trunnion mounted ball optional Available in floating‑ball for small‑medium size and trunnion‑mounted ball for large‑size high‑pressure service. Spring‑loaded seat realizes reliable bi‑directional sealing. DBB double‑block‑and‑bleed function optional for trunnion type.

3. Flanged RF / RJ end connection Flanged ends conform to ASME B16.5. High connection rigidity, easy installation, disassembly and on‑site maintenance. Full‑port and reduced‑port bore for selection.

4. Explosion‑proof pneumatic actuator assembly Equipped with ATEX / Ex‑certified explosion‑proof pneumatic quarter‑turn actuator. Supporting explosion‑proof solenoid valve, explosion‑proof limit switch. Suitable for hazardous explosive gas & vapor environments. Double‑acting or spring‑return single‑acting actuator configurable.

5. Anti‑blow‑out stem & anti‑static structure Anti‑blow‑out stem avoids stem ejection under internal pressure. Anti‑static device conducts static charge generated between ball and seats to ground, preventing static spark risk.

6. Body cavity self‑relief design Relieve over‑pressure caused by thermal expansion of trapped medium inside valve cavity, protecting valve body and sealing components.

7. Strict API 6D design & manufacturing Designed, manufactured and tested fully following API 6D requirements, including fire‑safe test, pressure test and fugitive emission test.

Advantages

• Forged steel body: compact grain structure, higher strength and pressure resistance compared with cast valve body, fewer internal material defects.

• Explosion‑proof complete pneumatic package: safe operation in flammable & explosive hazardous area, avoids ignition source risk for oil & gas, petrochemical sites.

• Compliant with API 6D standard, supports fire‑safe performance and fugitive emission requirement for critical process pipeline.

• Fast 90‑degree quarter‑turn pneumatic operation, remote automatic on‑off control; spring‑return type provides fail‑safe protection when air supply fails.

• Anti‑static & anti‑blow‑out stem improve intrinsic safety for dangerous media.

• Flanged connection provides reliable pipeline joint, convenient for installation and overhaul.

• Optional DBB function for safe isolation and cavity venting during equipment maintenance.

• Wide adaptability for oil, natural gas, LPG and other flammable process media.