Specification

TIANYU API 6D 2PC Forged Stainless Steel Trunnion Ball Valve (F316L, 600LB)

I. Product Overview

TIANYU API 6D trunnion ball valve is a high-performance flow control solution engineered for corrosive, high-pressure industrial pipelines. Crafted with forged F316L stainless steel, it features a two-piece (2PC) structure, trunnion-mounted ball, and flange connections, with options for reduced bore (e.g., 2″ to 1.5″). Operating at 600LB (10.0MPa) and -196℃~450℃, it complies with NACE MR0175 (for sour service) and ISO 5211 (actuator mounting), integrating PEEK seals and safety designs like anti-blowout stems. Ideal for oil & gas, chemical, and offshore industries, it balances corrosion resistance, high-pressure stability, and precise flow control in demanding environments.

II. Key Attribute Parameters

Size Range: 1/2″~36″ (DN15~DN900), with reduced bore options (e.g., 2″ inlet to 1.5″ outlet) for flow restriction needs. Core sizes include 4″ (DN100) for medium-diameter pipelines.
Pressure Rating: 600LB (PN100, 10.0MPa), suitable for high-pressure systems like oil wellhead lines and chemical reactor feed pipelines.
Temperature Range: -196℃~450℃, with F316L retaining toughness in cryogenic conditions and resisting oxidation at high temperatures, adapting to media from liquid nitrogen to superheated steam.
Material Configuration:
- Body & Ball: Forged F316L stainless steel (low-carbon 316), containing 2-3% molybdenum for enhanced chloride corrosion resistance—critical for sour gas, seawater, and acidic media.
- Stem: F316L, anti-blowout design with precision threading to prevent ejection under pressure.
- Seat: PEEK (polyetheretherketone) for high-temperature resistance (up to 260℃) and chemical inertness; optional RPTFE for general media.
Connection Type: Flanged (RF/RTJ per ASME B16.5), ensuring leak-tight integration with standard pipelines. Forged flanges enhance structural strength under high pressure.
Actuation: Compatible with ISO 5211 mounting pads for pneumatic/electric actuators; manual options include handwheel or worm gear for torque reduction.
Design & Test Standards: Follows API 6D (pipeline valves), NACE MR0175 (sour service); testing complies with API 598 (hydrostatic shell test at 1.5×600LB, seat test at 1.1×600LB).

Product Overview

III. Features Description

Trunnion-Mounted Ball Structure: The ball is fixed by upper and lower trunnions, eliminating displacement under 600LB pressure. This design reduces seat wear compared to floating ball valves, ensuring stable sealing in high-pressure, frequent-operation systems (e.g., oil transfer lines).
Reduced Bore Flexibility: Options like 2″to 1.5″ 缩径 balance flow control and pressure drop, ideal for systems requiring flow restriction (e.g., metering lines) without compromising structural integrity.
F316L Corrosion Resistance: Forged F316L minimizes carbon content (≤0.03%) to avoid intergranular corrosion, outperforming F304 in chloride-rich environments (e.g., offshore platforms). NACE compliance ensures resistance to sulfide stress cracking in sour gas applications.
PEEK Seal Performance: PEEK seats withstand high temperatures (260℃) and resist chemicals like acids and solvents, making them suitable for pharmaceutical and petrochemical processes where PTFE might degrade.
Safety-Enhanced Design:
- Anti-blowout stem: A shoulder mechanism prevents stem ejection, critical for high-pressure systems handling flammable media.
- Anti-static device: Metal springs dissipate static electricity, reducing spark risks in natural gas pipelines.
- API 607 fire-safe: Metal backup seals maintain sealing if PEEK/PTFE degrades in fire, meeting oil & gas safety regulations.

IV. Manufacturing Processes

Forging & Heat Treatment: F316L ingots are forged to dense blanks, eliminating casting defects. Forgings undergo solution annealing (1050℃ quenching) to enhance corrosion resistance and toughness.
Precision Machining: Ball and trunnion surfaces are CNC-ground to Ra ≤0.8μm for uniform seat contact. Reduced bore dimensions are machined to tight tolerances (±0.02mm) to ensure flow accuracy.
Seal Assembly: PEEK seats are compression-molded and precision-cut to match ball contours. For high-pressure applications, seats are pre-loaded to maintain contact under pressure fluctuations.
Flange Welding & Inspection: Forged flanges are welded to the body, then X-ray inspected to detect defects. Post-weld heat treatment relieves residual stress, preventing cracking under thermal cycling.
Testing:
- Hydrostatic Test: Body tested at 15.0MPa (1.5×600LB) for 30 minutes; seat tested at 11.0MPa (1.1×600LB) with water to verify zero leakage.
- NACE Test: Material samples undergo sulfide stress cracking testing to comply with MR0175.
- Operation Test: 500+ open/close cycles with actuators to confirm smooth operation and consistent

Valve Details

V. Product Advantages

High-Pressure Reliability: Trunnion design and forged F316L enable stable operation at 600LB, outperforming floating ball valves in large-diameter, high-pressure systems (e.g., pipeline transmission).
Corrosion Resistance: F316L and NACE compliance make it ideal for sour gas, seawater, and chemical environments—service life is 3× longer than carbon steel valves in corrosive media.
Reduced Bore Efficiency: Tailored flow restriction avoids over-engineering, lowering costs for metering or low-flow applications while maintaining high-pressure integrity.
Broad Temperature Range: PEEK seals and F316L allow operation from -196℃ (liquid nitrogen) to 450℃ (superheated steam), eliminating the need for multiple valve types in mixed-temperature systems.
Global Compliance: API 6D, ASME, and NACE certifications ensure compatibility with international projects, from North American oil fields to Middle Eastern gas plants.

Application

VI. Product Applications

Oil & Gas Industry: Controls sour gas, crude oil, and refined fuels in wellheads, pipelines, and storage terminals. NACE compliance resists sulfide corrosion; 600LB rating handles high-pressure transmission.
Offshore & Marine: Manages seawater, drilling fluids, and gas in offshore platforms. F316L resists saltwater corrosion; flanged connections withstand vibration.
Chemical Processing: Regulates acids, solvents, and reactive chemicals. PEEK seals and F316L ensure compatibility with aggressive media (e.g., sulfuric acid, chlorides).
Pharmaceutical Production: Controls high-purity steam and solvents in sterile processes. F316L’s smooth surface and PEEK inertness avoid media contamination.

VII. Product Summary (110 words)

TIANYU 2PC trunnion ball valve: 1/2″~36″, 600LB, F316L, -196~450℃. Flanged, NACE/ISO 5211. For oil, chemicals. Customizable: 2″→1.5″ Reduction in diameter，metal seats for high temp, electric actuators for automation.