API 602 ASME B16.34 GB/T 12235 CE DN65 PN25 WCB Flanged Cast Carbon Steel Manual Handwheel Operated, with F6a Stem & LNT+13Cr Globe Valve

II. Manufacturing Process, Key Features & Product Advantages

A. Manufacturing & Quality Control Process

• Raw Material Sourcing & Incoming Inspection: All raw materials, including ASTM A216 WCB castings, ASTM A182 F6a stem bar, and 13Cr trim stock, are sourced from certified suppliers. Each batch undergoes incoming material testing (IMT), including chemical composition analysis, mechanical property testing (tensile, yield, elongation), and hardness testing, to verify compliance with material specifications.
• Casting & Heat Treatment: The WCB valve body and bonnet are produced using precision sand casting, optimized for the complex geometry of the globe valve’s S-shaped flow path. Castings are normalized at 900–950°C to refine grain structure, improving mechanical strength and impact resistance. All castings undergo 100% visual inspection, magnetic particle testing (MT) for surface defects, and ultrasonic testing (UT) for internal porosity, in accordance with ASME V Article 6 and 23.
• Precision Machining: Critical components, including the seat, disc, stem, and flange faces, are machined using CNC equipment to tight tolerances (±0.02 mm). The seat and disc sealing surfaces are lapped to a mirror finish (Ra ≤ 0.8 μm) to ensure a tight metal-to-metal seal. The stem is ground to ensure straightness and minimize friction with the packing gland.
• Trim Assembly & Coating Application: The 13Cr seat and disc are coated with LNT material (if specified) to reduce noise and cavitation. The stem is assembled with the disc and packing gland components in a clean environment, ensuring proper alignment and function.
• Final Assembly & Testing: The valve is fully assembled, with the bonnet secured using high-strength bolts torqued to specified values. Every valve undergoes hydrostatic shell testing at 37.5 bar and seat leakage testing at 27.5 bar, per API 598, to verify structural integrity and shut-off performance. A pneumatic seat test is also conducted to confirm zero leakage. After testing, valves are cleaned, primed, and coated with a high-quality black epoxy paint to prevent corrosion during storage and installation.

B. Key Product Features

• Precision Throttling & Shut-Off Performance: The globe valve’s contoured disc and seat design provide linear flow characteristics, making it ideal for both on-off isolation and modulating flow control. Unlike gate valves, which are prone to vibration and wear in throttling service, this valve maintains stable performance and tight shut-off over long periods.
• Robust WCB Construction: ASTM A216 WCB cast carbon steel offers excellent strength and impact resistance, suitable for temperatures up to 425°C. The material is widely compatible with common industrial fluids, including steam, water, oil, and mild corrosives.
• F6a Stainless Steel Stem: The ASTM A182 F6a stem is heat-treated for hardness and corrosion resistance, ensuring smooth operation and resistance to galling. The rising stem design provides clear visual indication of valve position.
• Hardened 13Cr Seat & Disc with LNT Coating: The 13Cr seat and disc are hardened for enhanced wear resistance, ensuring long-term tight shut-off. The optional LNT coating reduces flow-induced noise and cavitation, improving performance in high-pressure drop applications.
• Bolted Bonnet with Packed Gland: The bolted bonnet design allows for easy maintenance of internal components, while the flexible graphite packing gland provides a reliable dynamic seal around the stem. The spiral-wound graphite gasket provides a secondary static seal at the body-bonnet joint.
• Standard Flanged Connections: The flanged end connections are manufactured to meet international dimensional standards, ensuring compatibility with most piping systems. The raised face design enhances gasket seating and prevents leaks.
• Compliant with Global Standards: The valve is designed, manufactured, and tested in accordance with API 602, ASME B16.34, GB/T 12235, and CE directives, ensuring compatibility with international projects and easy acceptance by EPC contractors worldwide.

C. Product Advantages

• Superior Throttling Control: The globe valve’s design allows for precise flow regulation, making it ideal for applications requiring accurate control of fluid flow rates. This is particularly beneficial in steam and water systems where maintaining pressure and flow balance is critical.
• High Reliability & Long Service Life: The combination of high-quality materials, precision manufacturing, and rigorous testing ensures the valve delivers reliable performance for over 10 years in typical process conditions. The hardened trim and robust construction minimize wear and tear, reducing maintenance requirements.
• Versatile Fluid Compatibility: The WCB body, combined with optional trim materials, offers compatibility with a wide range of process fluids, including steam, water, oil, hydrocarbons, and mild corrosives. This makes the valve suitable for diverse applications across multiple industries.
• Cost-Effective Operation: The valve’s low maintenance design, combined with its long service life, results in a low total cost of ownership (TCO). The packed gland design allows for easy adjustment or replacement of packing, eliminating the need for specialized tools or services.
• Enhanced Safety & Environmental Compliance: The valve’s tight shut-off performance prevents fluid leaks, reducing the risk of safety hazards and environmental contamination. The compliance with international standards ensures the valve meets regulatory requirements for industrial equipment.
• Flexible Installation & Integration: The standard flanged connections ensure easy integration with existing piping systems, while the compact design allows for installation in a variety of orientations. The manual handwheel operation eliminates the need for external power sources, making the valve suitable for remote or unpowered facilities.