Specification

2″~24″ ANSI Class 150~900 Stainless Steel 2PC Trunnion Mounted Flanged Ball Valve

I. Product Overview

TIANYU 2PC ANSI Class 900 stainless steel trunnion mounted flanged ball valve is a high-pressure flow control solution engineered for critical industrial systems. Crafted with stainless steel (304/316), duplex steel (2207/2507), and other high-performance materials, it features a two-piece structure, trunnion mounted (fixed ball) design, and flange connection to ensure reliable on-off control of water, natural gas, oil, and mild corrosive media. Operating at -20℃~200℃ and Class 150~900 pressure, it leverages trunnion supports (upper and lower) to stabilize the ball, avoiding deformation under high pressure. Compliant with API 6D, API 608, and ASME B16.34 standards, it is ideal for oil & gas transmission, high-pressure gas pipelines, and chemical processing—where high-pressure resistance and sealing stability are critical.

Product Description
Porduct Name	2PC ANSI Class 900lb Stainless Steel Trunnion Mounted Flanged Ball Valve
Material	304/316/B62/2207/2507/316ti/C95800, etc.
Size	2″-24″(DN100-DN900)
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

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

II. Key Attribute Parameters

Size Range: 2″~24″ (DN100~DN600), covering medium to large-diameter pipelines for high-pressure flow systems.
Pressure Range: ANSI Class 150~900 (2.0MPa~15.0MPa), adapting to medium to high-pressure applications such as offshore oil lines and high-pressure gas transmission.
Temperature Range: -20℃~200℃, with stainless steel/duplex steel retaining toughness in low temperatures and resisting oxidation in heated media.
Material Configuration:
- Body & Ball: 304/316 stainless steel (general corrosion resistance); duplex steel 2207/2507 (enhanced strength for high pressure); optional C95800 (for marine corrosion).
- Seat: PTFE (general media), PTFE+carbon fiber (high pressure), PPL (high temperature)—all ensuring tight sealing under pressure.
- Trunnion & Stem: 316 stainless steel or duplex steel, with anti-blowout stem design to prevent ejection under extreme pressure.
- End Connections: Flanged (RF) per ASME B16.47, ensuring leak-tight integration with high-pressure pipelines.
Actuation: Manual (worm gear), pneumatic, or electric—worm gear for high torque (large diameters), automated options for remote control.
Design & Test Standards: Design follows API 6D, API 608; testing complies with API 598 (hydrostatic strength test at 1.5×rated pressure).

Product Overview

III. Features Description

Trunnion Mounted Stability: The ball is fixed by upper and lower trunnions, eliminating displacement even under Class 900 pressure. This avoids ball deformation or seat wear—common issues in floating ball valves under high pressure—ensuring long-term sealing reliability.
2PC Structure & Full Bore: The two-piece body (bolted split design) balances structural strength and maintenance accessibility; internal components (ball, seat) can be inspected without full pipeline disassembly. Full bore design matches pipeline diameter, minimizing pressure drop and enabling unobstructed flow of viscous media (e.g., heavy oil).
Dual Sealing Options: Soft seats (PTFE) achieve ANSI/FCI Class VI leakage (near-zero) for clean media; metal seats (optional) suit high-temperature/highly abrasive media (e.g., gas with particles), with spring-loaded design compensating for wear.
Anti-Static & Blow-Out Proof: Integrated anti-static device (grounding between ball and body) prevents static buildup—critical for flammable gas systems. Anti-blowout stem (mechanical retention) avoids ejection under pressure, meeting API safety standards.
High-Pressure Compatibility: Thick-walled body (minimum 15mm for DN100) and trunnion supports withstand Class 900 pressure, with stress distribution optimized via finite element analysis (FEA) to avoid deformation in long-term use.

IV. Manufacturing Processes

Material Validation: Stainless steel/duplex steel castings undergo ultrasonic testing to detect internal defects. Spectral analysis verifies alloy content (e.g., 2207 duplex steel contains Cr 22%, Ni 5%, Mo 3%) to ensure strength and corrosion resistance.
Precision Machining: CNC turning centers machine the body and trunnion supports to tight tolerances (±0.03mm), ensuring the ball rotates smoothly without jamming. The ball’s sealing surface is ground to Ra ≤0.8μm for uniform contact with the seat.
Trunnion Assembly: Upper and lower trunnions are press-fitted into the body with interference fit, then welded for stability. A torque test (500~1000N·m) confirms the ball rotates without excessive friction.
Testing:
- Hydrostatic Test: Body tested at 1.5×rated pressure (e.g., 22.5MPa for Class 900) for 30 minutes; seat tested at 1.1×rated pressure with water to confirm no leakage.
- Gas Tightness Test: 0.6MPa air test ensures stem packing and flange gaskets are leak-tight, critical for gas applications.
- Operation Test: 100+ open/close cycles with Class 900 pressure applied, verifying smooth rotation and consistent sealing.

Valve Details

V. Product Advantages

High-Pressure Stability: Trunnion design eliminates ball displacement under Class 900 pressure, reducing seat wear by 60% compared to floating ball valves—extending service life to 15+ years in high-pressure systems.
Reliable Sealing: Spring-loaded seats compensate for wear, maintaining tight sealing even after 10,000+ cycles. This avoids unplanned shutdowns in oil & gas transmission, where leakage risks environmental hazards.
Corrosion Resistance: Duplex steel 2207/2507 resists pitting from chloride (e.g., offshore saltwater) and sulfide (e.g., sour gas), outperforming 316 stainless steel in harsh corrosive environments.
Easy Maintenance: 2PC structure allows seat/ball replacement without removing the valve from the pipeline, cutting maintenance downtime by 50% vs. one-piece valves.
Safety Compliance: Anti-static and anti-blowout features meet API 6D safety requirements, reducing explosion risks in flammable gas systems—critical for oil refineries and gas storage facilities.

Application

VI. Application Fields

Oil & Gas Transmission: Controls high-pressure crude oil and natural gas flow in onshore/offshore pipelines, with trunnion design handling Class 900 pressure and duplex steel resisting sour gas corrosion.
High-Pressure Gas Systems: Regulates flow in compressed natural gas (CNG) and industrial gas pipelines, where anti-static design prevents ignition and tight sealing avoids gas leakage.
Chemical Processing: Manages high-pressure chemical transfer (e.g., ethylene, propylene), with PPL seats adapting to 200℃ media and stainless steel resisting chemical erosion.
Marine & Offshore: Used in offshore platform pipelines, with C95800 material resisting saltwater corrosion and trunnion supports withstanding wave-induced pressure fluctuations.
Power Generation: Controls high-pressure steam and cooling water flow in power plants, with metal seats handling 200℃ temperatures and ensuring long-term reliability.