Metal Seal Ball Valve

Specification

NWV 8-inch Flange-RTJ Class 2500 F316/F304 Stainless Steel Trunnion Ball Valve (NACE Compliant)

I. Product Overview

NWV 8-inch trunnion ball valve is a high-pressure, corrosion-resistant flow control solution engineered for extreme industrial environments. Crafted from forged F316 stainless steel, it features a trunnion-mounted ball structure, RTJ flange connections, and compliance with NACE MR0175 for sour service (H₂S-containing media). Operating at Class 2500 (42.0MPa) and -196℃~450℃, it integrates fire-safe and anti-static designs to handle aggressive media like sour gas, crude oil, and chemicals. Compliant with API 6D and ASME standards, it is ideal for oil & gas wellheads, offshore platforms, and chemical processing—where high pressure, corrosion, and safety are critical.

II. Key Attribute Parameters

Testing Pressure(Mpa)

Product Overview

III. Features Description

Trunnion-Mounted Ball Structure: The ball is fixed by upper/lower trunnions, eliminating displacement under 42MPa pressure. This design reduces seat wear compared to floating ball valves, ensuring stable sealing in frequent-operation systems (e.g., wellhead choke lines).

NACE MR0175 Compliance: F316 stainless steel resists sulfide stress cracking (SSC) in H₂S-rich environments (up to 20,000 ppm H₂S), critical for sour gas fields and refineries.

RTJ Flange Sealing: RTJ grooves with metal ring gaskets create a leak-tight seal under extreme pressure, outperforming RF flanges in high-pressure, vibration-prone systems (e.g., offshore pipelines).

Fire-Safe & Anti-Static Design: API 607-certified, with metal backup seals to maintain sealing if PEEK/PTFE seats degrade in fire. Anti-static springs dissipate static electricity, reducing spark risks in flammable media.

F316 Corrosion Resistance: Molybdenum (2-3%) in F316 enhances resistance to chlorides and acids, making it suitable for seawater, brine, and chemical processes where F304 would corrode.

IV. Manufacturing Processes

Forging & Heat Treatment: F316 ingots are forged to dense blanks, eliminating casting defects. Solution annealing (1050℃ quenching) enhances corrosion resistance by stabilizing the microstructure.

Precision Machining: Ball and trunnion surfaces are CNC-ground to Ra ≤0.8μm for uniform seat contact. RTJ flange grooves are machined to tight tolerances (±0.02mm) to ensure gasket compatibility.

Seal Assembly: PEEK seats are compression-molded and lapped to match ball contours, pre-loaded to maintain contact under pressure fluctuations. Metal backup seals are integrated for fire safety.

Testing:

Hydrostatic Test: Body tested at 63MPa (1.5×2500LB) for 30 minutes; seat tested at 46.2MPa (1.1×2500LB) with water.

NACE Test: Material samples undergo SSC testing in H₂S-saturated brine to verify compliance with MR0175.

Fire Test: API 607 certification via 700℃ fire exposure, followed by leak testing.

Valve Details

V. Product Advantages

Ultra-High-Pressure Stability: Trunnion design and forged F316 enable reliable operation at Class 2500, outperforming standard valves in wellhead and high-pressure injection systems.

Sour Service Reliability: NACE compliance ensures resistance to H₂S-induced cracking, reducing failure risks in sour gas fields—critical for operational safety.

Corrosion Resistance: F316’s molybdenum content withstands chlorides and acids, extending service life in offshore, chemical, and wastewater applications.

Leak-Tight Sealing: RTJ flanges and PEEK seats minimize fugitive emissions, meeting environmental regulations in oil & gas and chemical industries.

Low Maintenance: Forged construction and trunnion design reduce wear, with replaceable seats/actuators simplifying repairs—lowering lifecycle costs.

Application

VI. Product Applications

Oil & Gas Wellheads: Controls flow in high-pressure wellhead lines, choke manifolds, and production trees, resisting H₂S and extreme pressure.

Offshore Platforms: Handles seawater injection, produced water, and crude oil transfer, with F316 resisting saltwater corrosion and RTJ flanges withstanding platform vibration.

Chemical Processing: Manages aggressive media (acids, solvents) in reactor feed lines, where corrosion resistance and high-pressure stability are critical.

Refineries: Regulates flow in hydrocracking and sour crude processing units, complying with NACE standards to avoid sulfide-related failures.

NWV 8″ Class 2500 trunnion ball valve: F316 stainless steel, RTJ flange, NACE-compliant. -196~450℃, 42MPa. For sour gas, offshore, chemicals. Customizable: F316L for low-carbon needs, metal seats for 450℃+, electric actuators for automation. Ensures safety in extreme high-pressure, corrosive environments.