Specification

TIANYU API 6D High-Pressure 3 PCS 1500lb Flange-Type Forged Stainless Steel Full Port Trunnion Ball Valve

I. Product Overview

TIANYU API 6D 3-piece trunnion ball valve is a high-performance flow control solution engineered for extreme high-pressure industrial systems. Crafted from forged stainless steel and featuring a full port design, it integrates a trunnion-mounted ball structure and flange connections to handle aggressive media such as sour gas, crude oil, high-pressure steam, and corrosive chemicals. Operating at 1500lb (25.0MPa) and -54℃~316℃, it complies with API 6D, ASME B16.34, and NACE MR0175 standards. The 3-piece construction balances structural rigidity with maintenance accessibility, making it ideal for critical applications in oil & gas transmission, offshore platforms, and chemical processing—where high pressure, corrosion resistance, and reliable sealing are non-negotiable.

II. Key Attribute Specifications

Category	Details
Size Range	DN15~DN200 (1/2″~8″), with full port design ensuring the ball bore matches pipeline diameter, minimizing flow resistance.
Pressure Rating	1500lb (PN260, 25.0MPa) as core rating; optional 2500lb (PN420) for ultra-high pressure systems.
Temperature Range	-54℃~316℃: Forged stainless steel retains toughness in cryogenics; seal materials (e.g., PEEK, metal) extend compatibility to high temps.
Material Configuration	– Body, Ball & Trunnion: Forged stainless steel (F316/F316L as standard; F304 optional). F316L adds molybdenum (2-3%) for chloride corrosion resistance, critical for sour service. – Seal: PEEK (polyetheretherketone) for 260℃ max; optional metal seals (stellite-coated) for 316℃+ and abrasive media. – Stem: F316L with anti-blowout design, preventing ejection under pressure.
Connection Type	Flange (RF/RTJ per ASME B16.5), with precision-machined faces for metal-to-metal or gasket sealing, ensuring leak-tightness at 1500lb.
Actuation	Manual (handwheel with worm gear for torque reduction) as standard; optional electric/pneumatic actuators via ISO 5211 mounting pads for automation.
Design Standards	API 6D (pipeline valves), NACE MR0175 (sour gas service); testing per API 598 (hydrostatic shell test at 1.5×1500lb, seat test at 1.1×1500lb).

Product Overview

III. Features Description

Trunnion-Mounted Ball Structure: The ball is fixed by upper and lower trunnions, eliminating displacement under 1500lb pressure. Unlike floating ball valves, this design distributes force evenly across trunnions, reducing seat wear and ensuring stable sealing in high-pressure, frequent-operation systems (e.g., wellhead choke lines). Trunnions also integrate bearings to minimize friction, enabling smooth operation even under extreme pressure.
3-Piece Construction: The valve body splits into three sections (two end caps + one middle section) connected by bolts. This modular design allows easy disassembly for maintenance—technicians can replace seats, seals, or the ball without removing the valve from the pipeline. In offshore platforms where space is limited, this feature cuts maintenance downtime by 50% compared to 1-piece valves.
Full Port Design: The ball’s bore diameter equals the pipeline size, ensuring unobstructed flow. In high-velocity applications (e.g., natural gas transmission), this reduces pressure drop by up to 30% versus reduced-port valves, lowering energy consumption and preventing media erosion from turbulence.
Forged Stainless Steel Durability: Forging eliminates internal defects (porosity, cracks) in the valve body, enhancing tensile strength (≥550MPa) and resistance to pressure-induced fatigue. F316L’s low carbon content (≤0.03%) prevents intergranular corrosion, making it suitable for sour gas (H₂S-rich) environments per NACE MR0175.
High-Pressure Sealing: PEEK seals offer chemical inertness and resistance to cold flow (deformation under pressure) at 1500lb, maintaining tight sealing in cyclic pressure systems like steam injection lines. For high temps or abrasive media, metal seals (stellite-coated) provide fire-safe, wear-resistant performance, complying with API 607 standards.

IV. Manufacturing Processes

Forging & Heat Treatment: F316L billets undergo hot forging (1100-1200℃) to shape valve body, ball, and trunnion blanks. Forging aligns metal grains, improving impact resistance (Charpy V-notch ≥27J at -54℃). Post-forging, components undergo solution annealing (1050℃ quenching) to dissolve carbide precipitates, enhancing corrosion resistance—critical for sour service compatibility.
Precision Machining: CNC turning and grinding centers machine components to tight tolerances (±0.01mm). The ball’s sealing surface is lapped to Ra ≤0.4μm, ensuring uniform contact with seats. Trunnion bearings are precision-fit to minimize radial play, preventing uneven wear. Flange faces are machined to ASME B16.5 specs, with RTJ grooves (where applicable) ensuring gasket compatibility.
Assembly & Seal Integration: PEEK seats are compression-molded to match the ball’s contour, then bonded into seat pockets with high-temperature adhesive. Metal seals (if equipped) are welded and ground for flatness. The trunnion-ball assembly is fitted with bearings, and the stem is connected via a spline or keyway for torque transmission.
Testing: Each valve undergoes rigorous validation:
- Hydrostatic Test: Body pressurized to 37.5MPa (1.5×1500lb) for 30 minutes; no leakage or deformation allowed.
- Gas Seal Test: 27.5MPa (1.1×1500lb) with nitrogen to verify seat tightness (leakage ≤0.1×DN mm³/min).
- Operational Test: 500+ cycles with actuators to confirm smooth operation, with torque measurements within API 6D limits.

Valve Details

Tight and Reliable

High-quality raw materials are carefully selected, supplemented by multiple advanced processes to create a fine and high-quality product.Fine selection of high-quality raw materials, supplemented by multichannel advanced technology, to achieve good quality Seiko. lt hasgood sealing property and has been widely used in vacuum system
Wide Application

Diameter can be applied from a few millimeters to several meters, from high vacuum to high pressure. When the ball rotates 90 degrees, all spherical should be presented at the entrance and exit to cut off the flow.
Less Resistance

The fluid resistance is small, and its resistance coefficient is equal to that of the same length of pipe section.

V. Product Advantages

Ultra-High Pressure Stability: Trunnion design and forged construction enable reliable operation at 1500lb, outperforming floating ball valves in high-pressure systems. In a 3-year field study of offshore pipelines, TIANYU valves showed 99.8% uptime, with no failures due to pressure-induced wear.
Corrosion Resistance: F316L and NACE compliance resist sulfide stress cracking (SSC) in sour gas, extending service life to 10+ years in harsh environments—double the lifespan of standard stainless steel valves.
Maintenance Efficiency: 3-piece design allows in-line repair, reducing shutdown time. In chemical plants, this lowers maintenance costs by 40% compared to welded-body valves, which require full removal for servicing.
Energy Efficiency: Full port design minimizes pressure drop, cutting pump energy consumption by 15-20% in high-flow systems like crude oil transmission lines.
Global Compatibility: API 6D and ASME compliance ensures interoperability in international projects, from North American shale fields to Middle Eastern gas pipelines.

Application

VI. Product Applications

Oil & Gas Transmission: Controls high-pressure flow in wellhead manifolds, gathering lines, and subsea pipelines. Handles sour gas, crude oil, and produced water, with NACE compliance preventing SSC in H₂S-rich environments.
Offshore Platforms: Manages seawater injection, drilling mud, and gas lift systems. F316L resists saltwater corrosion; 3-piece design simplifies maintenance in space-constrained rigs.
Chemical Processing: Regulates high-pressure reactors and catalyst injection lines. PEEK seals withstand acids/solvents; metal seals option suits high-temperature processes (e.g., ethylene production).
Power Generation: Controls high-pressure steam in supercritical boilers and turbine cooling circuits. Forged construction withstands thermal cycling without degradation.

TIANYU API 6D 3-piece trunnion ball valve: DN15~DN200, 1500lb, F316L, full port, flange. Handles sour gas, oil, steam to -54~316℃. Reliable, maintainable, API/NACE compliant.Customize: F316L for extreme corrosion, metal seals for 316℃+, electric actuators with smart controls, RTJ flanges for ultra-high pressure. Tailored to your high-pressure system needs.