API 6D Large Bore Forged High Pressure Metal Hard Seal Flanged Trunnion Ball Valve

Product Overview

The API 6D Large Bore Forged High Pressure Metal Hard Seal Flanged Trunnion Ball Valve is a heavy-duty industrial isolation valve engineered exclusively for extreme high-pressure, high-temperature, and harsh corrosive pipeline working conditions. Fully compliant with core international standards including API 6D, ASME B16.34, ASME B16.5, and API 598, this large-diameter ball valve adopts an integral forged steel body and professionalmetal hard seal structure, thoroughly solving the common leakage failure of soft seal valves under sustained high pressure and high temperature environments.

Compared with conventional cast ball valves, the integral forged steel body features denser internal structure, higher mechanical strength, superior pressure resistance and structural stability, effectively resisting high-pressure medium impact and long-term pipeline vibration. Equipped with a standard trunnion mounted fixed ball structure, the valve greatly reduces operating torque, ensuring flexible, stable and jamming-free switching for large-bore high-pressure pipelines. Widely applied in oil and gas transmission, petrochemical refining, long-distance delivery pipelines and high-pressure industrial systems, it serves as the most reliable safety isolation solution for large-flow, high-pressure industrial pipeline projects worldwide.

Key Features & Advantages

1. Strict API 6D International Standard Compliance

Manufactured, inspected and tested in full accordance with API 6D pipeline valve specifications, covering structural design, high-pressure resistance, fire safety performance, hydrostatic testing and full factory quality inspection. It fully meets the strict acceptance standards of global oil & gas and petrochemical projects, perfectly adapting to international EPC engineering, overseas bidding and export engineering projects.

2. Integral Forged Steel Body with Ultra-High Pressure Resistance

The entire valve body adopts one-piece integral forging technology, with optional premium materials including forged A105, F304, F316 and F22. Different from cast valves, forged steel eliminates pores, sand holes, cracks and other internal defects, featuring ultra-high structural density, strong pressure resistance and excellent anti-fatigue performance. It can operate stably for a long time under ultra-high pressure and frequent switching working conditions, avoiding body deformation and damage.

3. Premium Metal Hard Seal & Bidirectional Zero Leakage

The valve seat and ball sealing surface are overlaid with high-performance Stellite 6/Stellite 12 hard alloy, forming a precision metal hard seal pair. It maintains stable and tight bidirectional sealing under high temperature, ultra-high pressure and high-speed medium scouring, achieving API 598 standard zero leakage. It completely avoids aging, deformation and sealing failure of traditional soft seal materials, ideal for high-temperature steam, high-pressure flammable gas and special chemical media.

4. Trunnion Fixed Ball Structure for Large Bore Stability

Specially designed for large-diameter pipelines, the trunnion mounted fixed ball structure adopts upper and lower fixed shaft positioning to bear most of the medium pressure. This design significantly reduces operating torque, solves the jamming and inflexible switching problems of large-size high-pressure valves, and greatly improves the overall operational stability and safety of the valve in high-pressure pipeline systems.

5. ASME Standard Flanged Connection for Easy Installation

Equipped with standard ASME B16.5 raised face flanged ends, with precisely processed sealing surfaces and standardized mounting dimensions. The flanged connection features simple and fast installation, accurate positioning and strong vibration resistance, perfectly suitable for fixed laying of long-distance industrial pipelines and daily maintenance and overhaul scenarios.

6. Complete Safety Configuration & Extended Service Life

Optional integrated anti-static device, API 607 fire-safe structure and body pressure relief device. It effectively prevents static accumulation and fire hazards, and automatically releases abnormal overpressure inside the valve body to protect pipeline system safety. The durable forged body and wear-resistant metal hard seal structure greatly extend the valve service life and reduce long-term operation and maintenance costs.

Technical Specifications

Applications

•Oil & Gas Industry: Long-distance natural gas transmission pipelines, crude oil transportation pipelines, wellhead stations, gas gathering and transportation systems

•Petrochemical & Refinery: High-pressure reaction pipelines, high-temperature process pipelines, chemical medium delivery systems

•Power Generation: High-pressure steam pipelines, boiler auxiliary systems, thermal power plant process pipelines

•Industrial High-pressure System: Large-flow industrial fluid pipelines, high-pressure water supply and circulation systems

•Energy Engineering: Municipal energy transmission, industrial park pipeline supporting projects

Why Choose Our API 6D Large Bore Forged Hard Seal Ball Valve?

✅ API 6D Authoritative Certification — Strictly manufactured and tested per API 6D standards, fully compliant with international pipeline specifications, supporting global EPC project bidding, inspection and acceptance.

✅ High-Strength Forged Steel Body — Integral one-piece forging process without casting defects, excellent pressure and temperature resistance, adapting to long-term harsh high-pressure working conditions.

✅ Metal Hard Seal Zero Leakage — Stellite alloy hard seal design, stable sealing under high temperature and high pressure, solving the leakage pain point of soft seal valves in extreme working conditions.

✅ Professional Large Bore Trunnion Design — Low operating torque, flexible switching and stable operation, customized for large-diameter, high-flow and high-pressure industrial pipelines.

✅ Full Customization Service — Multiple body/trims materials, pressure classes and driving modes are available to meet diverse high-pressure and high-temperature working condition requirements.

Order & Certification Information

MOQ: 1 Unit

Lead Time: 25-40 working days for large bore sizes

Certificates: EN10204 3.1 Material Certificate, API 598 Test Report, ISO 9001, Fire Safe Report

Packing: Anti-rust treatment + Reinforced plywood box

Warranty: 18-month quality warranty and lifelong technical support

Contact Us for large-diameter customization, high-pressure solution design and bulk quotation for API 6D forged hard seal ball valves.

What Is an API Large Bore Flanged Ball Valve

An API Large Bore Flanged Ball Valve is a quarter turn valve designed for isolation and flow control in large diameter pipeline systems. It features a precision machined ball that rotates to open or close the flow passage. The large bore design allows high flow capacity with minimal resistance, while flanged ends provide secure and convenient connections. Manufactured according to API requirements, this valve is widely used in oil and gas, petrochemical, power generation, and water treatment applications.

Why the API Large Bore Flanged Ball Valve Matters

This valve is important because it delivers reliable shutoff and efficient flow performance in demanding industrial environments. The large bore structure helps maintain smooth media transfer and reduces pressure loss throughout the system. API compliant construction ensures dependable sealing and mechanical strength under severe operating conditions. Flanged connections simplify installation and maintenance, making the valve suitable for critical services that require long term reliability and operational safety.

Common Product Types by API Large Bore Flanged Ball Valve

Common product types include floating ball valves, trunnion mounted ball valves, top entry ball valves, and side entry ball valves. Full port designs are commonly selected for maximum flow efficiency, while reduced port configurations are suitable for specific process requirements. Valves can be operated manually or equipped with electric, pneumatic, or gear actuators. Different seat materials and body constructions are available for corrosive, abrasive, and high temperature applications.

Key Advantages of API Large Bore Flanged Ball Valve

The valve offers excellent sealing performance, low flow resistance, and quick quarter turn operation. The large bore passage minimizes turbulence and improves overall system efficiency. Flanged ends provide reliable connections and simplify inspection or replacement procedures. API standard construction enhances durability and operational stability. With suitable materials and sealing options, the valve can withstand challenging service conditions while providing long service life and reduced maintenance requirements.

API Large Bore Flanged Ball Valve Machine Structure and Core Stations

Manufacturing begins with forging or casting the body, ball, stem, and end components using selected materials. Core stations include heat treatment, precision CNC machining of ball surfaces, seat pockets, flange faces, and stem connections. Assembly stations install the ball, seats, seals, stem, and operating mechanism. Final operations involve pressure testing, torque verification, surface treatment, cleaning, marking, and packaging to ensure dimensional accuracy and dependable sealing performance.