Specification

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

I. Product Overview

TIANYU 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

Category	Details
Size Range	6″~48″ (DN150~DN1200), with 8″ (DN200) as a core specification.
Pressure Rating	Class 2500 (42.0MPa), suitable for ultra-high-pressure systems like wellheads.
Temperature Range	-196℃~450℃, with F316 retaining toughness in cryogenics and resisting oxidation at high temps.
Material Configuration	– Body/Ball: Forged F316 stainless steel (18Cr-12Ni-2.5Mo) for chloride/corrosion resistance. – Stem: F316, anti-blowout design to prevent ejection under pressure. – Seat: PEEK (up to 260℃) or RPTFE (glass fiber reinforced) for chemical inertness. – Flange: Forged F316 with RTJ (Ring Type Joint) groove for high-pressure sealing.
Connection Type	RTJ flange (per ASME B16.5), ensuring metal-to-metal seal under Class 2500 pressure.
Actuation	ISO 5211 mounting pad for pneumatic/electric actuators; manual options (handwheel/worm gear) for torque reduction.
Standards	Design: API 6D, NACE MR0175 (sour service); Testing: API 598 (hydrostatic test at 1.5×2500LB).

Testing Pressure(Mpa)

Pressure	150LB	300LB	600LB	900LB	1500LB	2500LB
Strength Testing	3.0	7.5	15.4	23.0	37.5	63.0	Mpa
Seal Testing	2.2	5.5	11.2	16.9	27.5	46.2
Seal Testing	0.6	0.6	0.6	0.6	0.6	0.6

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.

Porduct Name	ANSI 2500lb Stainless Steel F316/F304 Trunnion Mounted 3PC Flange Ball Valve
Material	304/316/B62/2207/2507/316ti/C95800, etc.
Size	2″-24″(DN100-DN600)
Port	Full Port
Working Pressure	150LB/300LB
Connection Ends	RF
Working Temp.	-20ºC~200ºC
Suitable Medium	Water, Natural Gas, Oil and some corrosive liquid
Operated	Manual, Worm Gear, Pneumatic actuator, Electric Actuator
Features	Investment casting,Blow-out proof stem,Anti-static device(option)
Design standard	API6D/API608/API607
Inspection&Testing	According to API598
Design & Manufacture standard	API6D/API608/ASME16.34
Pressure & Temperature standard	ASME B16.34
Face to face dimension standard	ASME B16.10
Ends Connection standard	ASME B16.47
Test & Inspect standard	API 598

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.

TIANYU 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.