3″-150LB F321 Metal Seated Trunnion Ball Valve

TECHNICAL DATA SHEET (Supplement)

Product Name: 3″ 150LB F321 Metal Seated Trunnion Ball Valve
Connection Type: Butt Weld Ends (BW)

1. Product Description (Updated)

This is a 3-inch, Class 150 trunnion-mounted ball valve constructed from ASTM A182 F321 Stainless Steel with Butt Weld (BW) ends in accordance with ASME B16.25. Designed for permanent installation in high-pressure piping systems requiring leak-free, maintenance-free welded connections. The butt weld ends eliminate potential leak paths associated with flanged connections, making this configuration ideal for high-temperature, high-integrity applications in petrochemical, refining, and power generation industries .

2. Key Features (Additions for BW Ends)

• Butt Weld Ends: Beveled ends prepared per ASME B16.25 for full penetration welding to matching pipe schedules, ensuring a permanent, leak-proof seal .
• Integral Weld Preparation: Ends are machined with standard bevel (typically 30-37.5°) and root face for easy field welding .
• Material Consistency: Weld ends manufactured from the same ASTM A182 F321 material as the body, ensuring metallurgical compatibility with the pipe and maintaining corrosion resistance across the weld joint .
• Reduced Maintenance: Welded connections eliminate the need for gasket replacement and bolt retorquing associated with flanged valves.
• Compact Design: Butt weld ends typically result in a slightly shorter overall length compared to flanged connections, saving space and reducing weight .

3. Technical Specifications (Updated for BW Ends)

4. Material of Construction (Updated for Weld Ends)

5. Applicable Standards (Additions for BW Ends)

• Weld End Preparation: ASME B16.25 (Buttwelding Ends)
• Pipe Schedule Compatibility: ASME B36.10M / ASME B36.19M
• Wall Thickness Design: ASME B16.34
• Weld End Dimensions: Manufacturer’s standard in accordance with ASME B16.25

6. Dimensions (Reference: mm / inches) – BW Ends

*For a 3″ Class 150 trunnion ball valve with Butt Weld ends, the face-to-face dimension typically differs from flanged versions. For exact dimensions, please refer to manufacturer’s certified drawing.*

*Note: BW valves are typically 10-15% lighter than flanged equivalents due to the absence of flange masses.*

Weld End Details (ASME B16.25):

ISO 5211 Mounting Flange (Typical for 3″):

7. Weld End Preparation Diagram (Reference)

text

      |<--- L (Face-to-Face) --->|

      ==============||==============

                  / \

                 /   \

      __________/     \__________

                |     |

                |<--->|  Root Face (1.6 mm)

                |    

                37.5° (Typ.)

      Prepared to ASME B16.25

8. Available Options (Specific to BW Ends)

• Custom Weld End Prep: Special bevel geometries (J-prep, compound bevel) available for specific welding procedures.
• Schedule Compatibility: Weld ends available for Sch 10 through Sch 160 and custom wall thicknesses.
• Backing Rings: Can be supplied with or prepared for backing rings if required.
• Pre-Weld Cladding: Optional cladding on weld ends for corrosion-resistant overlay applications.
• PWHT Consideration: Material certification includes chemistry suitable for post-weld heat treatment (PWHT) if required by code .

Disclaimer: The information provided above is based on standard industry practices. For physical specifications and custom configurations, please refer to the official drawings or consult the factory. Weld end preparation should be verified with the specific welding procedure to be used.

Note on Butt Weld (BW) Ends: Butt weld connections offer several advantages over flanged connections including:

• Leak Prevention: Eliminates gaskets and bolted joints as potential leak paths .
• Weight & Space Savings: Typically 30-40% lighter and more compact than flanged valves .
• Permanent Installation: Ideal for buried lines, high-vibration areas, and critical service where maintenance access is limited .
• High Integrity: Full penetration welds provide strength equal to or greater than the pipe itself .

Important Welding Considerations for F321:

• Austenitic stainless steels like F321 require controlled welding procedures to prevent carbide precipitation and maintain corrosion resistance .
• Low heat input welding with interpass temperature control (typically < 150°C) is recommended .
• Filler material should typically be ER347 or ER309L for matching corrosion resistance .
• Post-weld cleaning and passivation are recommended to restore the protective oxide layer .

CAM KẾT:

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