API 609 ASME B16.34 CE Certified 10” 150LB WCB Carbon Steel Body F304 Stainless Steel Seat Flanged Connection Gear Operated Trunnion Mounted Soft Seated Ball Valve by TIANYU
I. Product Overview & Core Specifications
The TIANYU trunnion mounted ball valve represents a robust, precision-engineered solution for critical fluid isolation and flow control in industrial pipeline systems, designed to deliver uncompromising reliability and performance in high-demand applications. Engineered with a nominal size of 10” (DN250), this valve is optimized for medium-to-large flow rates, making it a cornerstone of oil and gas transmission, chemical processing, and power generation infrastructure. Rated for a pressure class of 150LB, it operates reliably at pressures up to 2.07 MPa, ensuring stability and leak prevention in systems where operational safety and regulatory compliance are non-negotiable.
The valve body is constructed from WCB carbon steel, a versatile material selected for its exceptional mechanical strength, impact resistance, and cost-effectiveness. Conforming to ASTM A216 standards, WCB exhibits a minimum tensile strength of 485 MPa and excellent ductility, enabling it to withstand cyclic pressure fluctuations, thermal shocks, and abrasive wear from particulate-laden fluids. This material choice ensures the valve maintains structural integrity over decades of service, even in harsh outdoor or corrosive operating conditions, while its weldability and machinability simplify installation and maintenance.
Complementing the robust body, the valve seat is fabricated from F304 (AISI 304) stainless steel, a premium alloy renowned for its corrosion resistance, temperature stability, and dimensional precision. With 18-20% chromium and 8-10.5% nickel content, F304 forms a passive oxide layer that protects against oxidation, pitting, and crevice corrosion in mild corrosive environments, including exposure to water, steam, and neutral chemicals. The soft-seated design, paired with F304’s smooth surface finish, achieves bubble-tight shutoff compliant with ANSI/FCI Class VI standards, minimizing leakage to prevent product loss, environmental contamination, and safety hazards.
For seamless integration into pipeline systems, the valve features a flanged connection design compliant with ASME B16.5 standards. Flanged connections provide a secure, leak-proof interface, allowing for easy assembly and disassembly during maintenance or retrofitting. The standardized flange dimensions and bolt patterns ensure interoperability with existing infrastructure, reducing installation time and costs while ensuring compatibility with global piping systems.
Actuation is delivered by a precision-engineered gear operator, designed to provide mechanical advantage for smooth, torque-controlled valve positioning. The gear box reduces the force required to operate the valve, enabling manual control even in high-pressure applications where direct manual operation would be impractical. The integrated handwheel features a positive-locking mechanism to prevent accidental operation, ensuring the valve remains in the desired position even under vibration or external forces. The ergonomic design of the handwheel reduces operator fatigue during frequent adjustments, while the compact footprint ensures compatibility with space-constrained installations.
II. Design Features & Functional Advantages
The TIANYU 10” 150LB trunnion mounted ball valve incorporates innovative design elements that elevate its performance, safety, and operational efficiency beyond conventional floating ball valves.
At the core of its design is the trunnion mounted configuration, which supports the ball on both upper and lower trunnions, reducing friction and wear between the ball and seats. This design distributes the fluid pressure evenly across the trunnions, eliminating the risk of ball displacement under high pressure and ensuring consistent sealing performance over thousands of cycles. Unlike floating ball valves, which rely on fluid pressure to seat the ball, the trunnion mounted design maintains a constant seal regardless of pressure fluctuations, enhancing reliability in critical isolation applications.
The soft-seated design, utilizing F304 stainless steel seats with a polymer seal insert, ensures bubble-tight shutoff across the entire operating range. The seats are engineered to conform to the ball surface under pressure, creating a tight seal that minimizes leakage even at low pressures or with viscous fluids. The polymer insert provides additional resilience, absorbing shock and vibration to maintain sealing integrity in dynamic operating conditions. Additionally, the seats are replaceable, allowing for easy maintenance and extending the valve’s service life without full replacement.
The valve incorporates an anti-blowout stem design, a critical safety feature that prevents the stem from being ejected from the body under high fluid pressure. The stem is secured by a mechanical retainer, ensuring it remains in place even if the primary seal fails, reducing the risk of catastrophic leakage and personnel injury. The stem also features a double-seal design, with both primary and secondary packing glands to prevent fugitive emissions, ensuring compliance with ISO 15848-1 standards for low-emission valves.
To address the risk of fire, a critical concern in oil and gas applications, the valve incorporates a fire-safe design compliant with API 607 and API 6FA standards. In the event of a fire, the polymer seal insert may degrade, but the valve’s metal-to-metal backup seal—formed by the F304 seat and stainless steel ball—ensures continued isolation of fluid flow, preventing catastrophic leakage and minimizing fire propagation. This design provides an additional layer of safety, ensuring the valve maintains integrity even under extreme thermal conditions.
The gear operator is equipped with a visual position indicator, providing clear, at-a-glance confirmation of the valve’s open/closed status. This reduces the risk of operator error and enhances safety by ensuring personnel can quickly verify valve position during maintenance or emergency response. The gear box also features a lubrication fitting, allowing for regular maintenance to ensure smooth operation and extend the service life of the gear train.
The valve body features a full-bore flow path, optimized through computational fluid dynamics (CFD) simulations to minimize pressure drop and turbulence. The smooth, laminar flow profile reduces energy consumption in high-throughput systems, while the full-bore configuration prevents debris accumulation, reducing the risk of clogging and extending maintenance intervals. The body’s streamlined internal geometry also minimizes erosion, ensuring long-term performance in abrasive fluid applications.
III. Manufacturing Process & Quality Assurance
The production of the TIANYU 10” 150LB trunnion mounted ball valve adheres to rigorous manufacturing processes and quality control protocols, ensuring each unit meets or exceeds industry standards and customer expectations.

Body Fabrication
The valve body is manufactured using a hot-forging process, where WCB carbon steel billets are heated to high temperatures and shaped under extreme pressure using precision dies. This process enhances material density, eliminates internal defects such as porosity or inclusions, and improves mechanical properties including tensile strength and impact resistance. After forging, the body undergoes heat treatment, including normalization and tempering, to refine its microstructure and relieve internal stresses, ensuring consistent performance across the component. The body is then machined to precise dimensions using CNC lathes and milling machines, with critical surfaces such as flange faces and seat pockets finished to a roughness of Ra ≤ 3.2 μm to ensure proper sealing and alignment.
Seat Production
The F304 stainless steel valve seats are fabricated from hot-forged billets, which are then machined to precise dimensions using CNC lathes and milling machines. The sealing surface is lapped and polished to a roughness of Ra ≤ 0.8 μm, ensuring a tight, leak-proof seal with the ball surface. The polymer seal insert is molded and bonded to the F304 seat, with dimensional accuracy verified using coordinate measuring machines (CMMs) to ensure compliance with design specifications. Each seat undergoes non-destructive testing (NDT), including ultrasonic inspection and dye penetrant testing, to detect internal defects or surface cracks that could compromise performance.
Assembly & Testing
The valve assembly process is conducted in a controlled, clean environment to prevent contamination and ensure precision alignment of components. Skilled technicians assemble the body, ball, seats, stem, and gear operator, following detailed work instructions and quality checklists. Critical assembly steps, such as stem alignment and seat adjustment, are verified using precision measurement tools including dial indicators and torque wrenches, to ensure compliance with design specifications.
Before leaving the factory, each valve undergoes a comprehensive series of performance tests in accordance with API 598 and API 609 standards:
- Shell Test: A hydrostatic pressure test conducted at 1.5 times the rated pressure (3.1 MPa for 150LB valves) to verify the body’s structural integrity and resistance to leakage.
- Seat Test: A pneumatic pressure test conducted at 1.1 times the rated pressure to ensure the seats provide a bubble-tight seal under both forward and reverse flow conditions.
- Operational Test: A functional test of the gear operator to verify smooth opening, closing, and locking functionality, with accurate position indication and torque control.
- Fire Test: A specialized test conducted in accordance with API 607 and API 6FA to evaluate the valve’s performance under simulated fire conditions, ensuring the metal-to-metal backup seal maintains isolation.
- Fugitive Emission Test: A test conducted in accordance with ISO 15848-1 to verify the stem packing’s ability to prevent fugitive emissions, ensuring compliance with environmental regulations.
Quality Management
TIANYU maintains an ISO 9001:2015 certified quality management system, governing all aspects of manufacturing from raw material procurement to final delivery. Raw materials, including WCB carbon steel and F304 stainless steel, are sourced from approved suppliers and undergo rigorous incoming inspection, including chemical analysis and mechanical testing, to ensure compliance with material specifications.
The company’s quality control laboratory is equipped with advanced testing equipment, including spectrometers, hardness testers, and pressure testing rigs, enabling real-time monitoring of material properties and product performance. A team of experienced quality assurance engineers conducts regular audits, process reviews, and non-destructive testing to identify and address potential issues before they impact product quality.
IV. Application Scenarios & Industry Relevance
The TIANYU 10” 150LB trunnion mounted ball valve is a versatile solution designed to meet the demands of a wide range of industrial applications where precise isolation, flow control, and safety are critical.
Oil & Gas Production & Transmission
In oil and gas applications, including upstream production, midstream transmission, and downstream refining, the valve is used to isolate critical equipment such as pumps, compressors, and meters for maintenance and repair. The trunnion mounted design ensures reliable sealing under high pressure, while the fire-safe construction enhances safety in high-risk environments. The WCB carbon steel body resists corrosion from crude oil and natural gas, making it suitable for onshore and offshore installations, while the soft-seated design minimizes leakage to prevent hydrocarbon release and environmental contamination.
Chemical Processing
In chemical processing plants, the valve is used to isolate process lines, reactors, and storage tanks, ensuring safe handling of corrosive or hazardous fluids. The F304 stainless steel seats resist degradation from acids, solvents, and hydrocarbons, maintaining reliable sealing performance even with aggressive chemicals. The trunnion mounted design provides consistent sealing under pressure fluctuations, while the anti-blowout stem design enhances safety in high-pressure applications. The valve’s compliance with API and ASME standards ensures it meets strict regulatory requirements for chemical processing facilities.
Power Generation
In power generation facilities, including thermal power plants and nuclear power plants, the valve is used to isolate steam lines, feedwater systems, and cooling water circuits. The WCB carbon steel body withstands high temperatures and pressures, while the F304 seats provide reliable sealing performance in steam and water applications. The gear operator enables precise control of flow rates, ensuring efficient operation of boilers and turbines, while the fire-safe design enhances safety in high-temperature environments.
Water Treatment & Desalination
In water treatment and desalination plants, the valve is used to isolate membrane systems, pumps, and chemical feed lines, ensuring efficient maintenance and preventing contamination of treated water. The WCB carbon steel body resists corrosion from chlorinated water and seawater, while the F304 seats provide reliable sealing performance in high-flow, low-pressure applications. The trunnion mounted design ensures consistent sealing under pressure fluctuations, while the soft-seated design minimizes leakage to maintain water quality and regulatory compliance.
Offshore & Marine Applications
In offshore and marine applications, including FPSOs (Floating Production Storage and Offloading units) and offshore platforms, the valve is used to isolate critical systems such as firewater lines, fuel transfer systems, and hydraulic control lines. The WCB carbon steel body resists corrosion from saltwater and marine atmospheres, while the fire-safe design enhances safety in high-risk environments. The gear operator is suitable for installation in space-constrained offshore modules, while the anti-blowout stem design ensures reliable performance in dynamic operating conditions.
V. Compliance & Certification
The TIANYU 10” 150LB trunnion mounted ball valve is designed and manufactured in compliance with a comprehensive set of international and industry standards, ensuring safety, performance, and interoperability with global pipeline systems.
International Standards
- API 609: Specifies design, manufacturing, testing, and inspection requirements for ball valves, including trunnion mounted configurations, ensuring structural integrity and performance in critical applications.
- API 598: Outlines pressure testing and inspection procedures for industrial valves, verifying leakage and performance criteria.
- API 607 / API 6FA: Specifies fire-safe design and testing requirements for valves, ensuring performance under simulated fire conditions.
- ASME B16.34: Specifies design, manufacturing, and testing requirements for valves for pressure piping applications, ensuring compliance with global piping standards.
- ASME B16.5: Specifies dimensional requirements for flanged connections, ensuring compatibility with ANSI/ASME pipeline systems.
- CE Marking: Confirms compliance with the European Union’s Pressure Equipment Directive (PED) 2014/68/EU, enabling marketing and use within the European Economic Area (EEA).
- ISO 15848-1: Specifies test procedures for fugitive emissions from valve stem packing, ensuring compliance with environmental regulations.
- ANSI/FCI Class VI: Specifies leakage requirements for control valves, ensuring bubble-tight shutoff in critical applications.
Quality Certifications
TIANYU holds ISO 9001:2015 certification for its quality management system, demonstrating a commitment to consistent quality and continuous improvement. The company also maintains ISO 14001 (environmental management) and ISO 45001 (occupational health and safety) certifications, ensuring sustainable and safe manufacturing processes.
These certifications and compliance with international standards provide customers with confidence in the valve’s performance, reliability, and safety, making it a trusted choice for critical infrastructure projects worldwide.
The TIANYU 10” 150LB trunnion mounted ball valve delivers robust, reliable performance for critical fluid isolation and flow control applications, combining WCB carbon steel’s durability with F304 stainless steel’s corrosion resistance. Its trunnion mounted design ensures consistent sealing under pressure, while the soft-seated configuration achieves bubble-tight shutoff. Certified to API, ASME, and CE standards, and backed by ISO 9001 quality assurance, it excels in oil and gas, chemical processing, and power generation, ensuring operational safety, regulatory compliance, and long-term value for industrial infrastructure.







