Valve
Your Professional Valve Supplier
Octal Pipe is a professional and integrated supplier of oilfield products and industrial steel solutions based in China. With extensive experience in supply, distribution, and manufacturing, we specialize in providing a wide range of steel materials for the oil & gas, energy, and industrial sectors.
Why Choose Us
Superior Quality Assurance
Our steel pipes undergo rigorous testing and adhere to international standards, ensuring unmatched durability, corrosion resistance, and performance in extreme conditions.
Certificates
Every product is backed by full material traceability, mill certificates, and compliance with international standards such as API, ASTM, ASME, EN, and ISO.
Competitive Pricing
We deliver premium-grade steel pipes at reasonable costs, optimizing value through efficient manufacturing and supply chain management without compromising on quality.
Fast & Reliable Delivery
Leveraging efficient sea freight logistics and a global network, we ensure timely ocean shipping of steel pipes, minimizing delays and keeping your industrial operations on schedule.
Standards & Technical Specifications
| Standard | API Spec 6D & ISO 14313 (pipeline valves specification) |
| Pressure Classes | API Class 150, 300, 600, 900, 1500, 2500 (when available) |
| Valve Types | Gate, Ball, Check (swing, dual plate), Plug, Air/Vacuum, Knife Gate (special) |
| Connection Types | Flanged (ASME B16.5 / B16.47), Butt Weld Ends (BW), Socket Weld (SW), Threaded (NPT / BSP), Flangeless designs (if required) |
| Materials | Carbon steel (A216 WCB, WCC), Low-temperature steels (LCC, LCB), Stainless steel (304, 316, 316L), Duplex / Super Duplex, Alloy steels (Cr-Mo, WC6 / WC9, etc.) |
| Seat / Trim Materials | Soft seats (PTFE, PEEK), metal seats, bi-metal trims, hardened trims |
Models & Size / Pressure Specifications
|
Valve Type |
Size Range (NPS) |
Pressure Classes (API / ANSI) |
End Connection Options |
Typical Materials |
|
Gate Valve |
2″ – 48″ |
150, 300, 600, 900, 1500 |
Flanged, BW, SW |
Carbon steel WCB/WCC, low temp steels |
|
Ball Valve |
2″ – 24″ |
150, 300, 600 |
Flanged, BW, Threaded |
Stainless steel, carbon steel with trims |
|
Check Valve |
2″ – 36″ |
150, 300, 600 |
Flanged, BW |
Carbon steel, stainless trim |
|
Plug Valve |
2″ – 24″ |
150, 300 |
Flanged, BW, Threaded |
Alloy steels, stainless steel |
|
Air / Vacuum Valve |
1″ – 8″ |
150, 300 |
Flanged or Threaded |
Cast steel / Stainless |
Special larger sizes and classes available per project requirement; contact Octal Pipe engineering for custom spec.
Key Features of API 6D
Full Bore Design
API 6D mandates full-bore openings to accommodate pigs used in pipeline cleaning and inspection. This design ensures unobstructed passage for pigs, which is critical for maintaining pipeline efficiency and preventing blockages.
Enhanced Safety Requirements
The standard includes strict requirements for pressure-relief mechanisms. Valves must have automatic cavity pressure relief to prevent trapped fluids from causing dangerous pressure build-up that could exceed the valve’s pressure rating.
Fire Safety
API 6D prioritizes fire-safe designs. Valves must incorporate a secondary metal seat that activates if the primary soft seat fails during a fire. This ensures a robust seal even under extreme conditions, protecting the pipeline and its surroundings.
Rigorous Testing Protocols
API 6D requires hydrostatic shell, seat, backseat testing, and specific drift tests for gate and plug valves. These stringent tests verify valves can withstand operational pressures, temperatures, and environmental challenges unique to pipelines.
Specialized Material Standards
API 6D specifies material requirements to ensure durability and compatibility with petroleum and natural gas applications. It references materials suitable for high-pressure and high-temperature environments.
Key Requirements of API 6D Standard
Valve Types
Full-bore pipeline valves (gate, ball, check, plug)
Materials
Corrosion-resistant alloys for sour service (e.g., H₂S environments)
Testing
Extended duration seat tests + fugitive emissions testing
Design Focus
Piggability, buried service, and emergency shut-off capability
Practical Tips for Identification
Check the Markings
• API 6D: Look for markings that indicate compliance with API 6D, including the standard number, pressure rating, and material.
• API 600: Look for markings that indicate compliance with API 600, including the standard number, pressure rating, and material.
Verify the Documentation
• API 6D: Ensure the valve comes with detailed documentation that includes manufacturing records, test results, and certification.
• API 600: Ensure the valve comes with documentation that includes manufacturing records, test results, and certification, confirming compliance with API 600.
Inspect the Valve Design
• API 6D: Inspect the valve design to ensure it meets the requirements for the specific valve type (e.g., ball valve, gate valve).
• API 600: Inspect the gate valve design to ensure it meets the detailed requirements specified in API 600.
Design and Manufacturing Standards
Design Requirements
The design specifications in API 6D ensure that valves are fit for purpose in pipeline applications. The design must allow for reliable performance under various operational conditions such as extreme pressures and temperatures. Key factors considered include valve type, size, and material, with a focus on durability and safety. The valves must also comply with flow control specifications that help regulate fluid movement, ensuring they can handle the pressure, chemical properties, and environmental challenges of pipeline operations.
Manufacturing Standards
Manufacturing under API 6D requires strict quality control and adherence to global standards. All valves must be fabricated using precision techniques that guarantee accuracy and consistency in valve dimensions and performance. The manufacturing process also involves extensive testing, such as pressure and leak testing, to ensure that each valve performs optimally before being deployed in a pipeline system.
Pressure and Temperature Ratings
The Pressure and Temperature Ratings for valves covered under API 6D depend on a variety of factors, including the type of valve, the material used, and the specific application. Below is a general overview and typical data based on industry standards:
Pressure Rating
● The pressure rating of a valve refers to the maximum pressure that the valve can safely handle at a specific temperature without compromising its structural integrity or sealing performance.
● For API 6D valves, the pressure ratings are categorized into pressure classes (ANSI classes), typically ranging from 150 to 2500. This class determines the allowable working pressure of the valve based on its design and material.
Pressure Class Examples
● Class 150: Used for lower pressure systems, typically up to 285 psi (pounds per square inch).
● Class 300: Handles pressure up to 740 psi.
● Class 600: Rated for systems operating at 1480 psi.
● Class 1500: Rated for pressure up to 4450 psi.
● Class 2500: Handles pressures of up to 7400 psi.
Material Specifications
The materials used for API 6D valves must adhere to a set of specific guidelines that ensure durability and strength. Key material specifications include:
Body and Bonnet Materials: Valve bodies and bonnets must be made from materials that can withstand the internal pressure and environmental conditions. Common materials include carbon steels, stainless steels, and alloy steels. The material choice depends on the valve’s size, pressure class, and operating temperature.
Sealing Materials: The sealing materials in API 6D valves, including gaskets, seals, and packing, are designed to prevent leakage under high pressure. These materials must meet the chemical resistance and temperature tolerance requirements specified by the valve’s intended application.
Bolting and Fasteners: The bolting used in API 6D valves must conform to additional standards, such as API 20E for carbon steel and API 20F for corrosion-resistant bolting. The bolting ensures structural integrity under extreme pressure conditions and must be sourced from qualified manufacturers.
Trim Materials: Trim parts such as seats, stems, and discs are often made from materials like stainless steel or high alloys to ensure resistance to wear, corrosion, and high temperatures.
Non-Pressure Boundaries: Components such as supports, actuator attachments, and accessories are not part of the pressure boundary but must still be made from durable materials to support the valve’s function and reliability.
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