1″-800LB-SW Bellows Seal Globe Valve

Technical Data Sheet

Product: Bellows Seal Globe Valve
Size / Rating: 1″ – Class 800 – SW (Socket Weld)

1. General Description

This high‑pressure bellows seal globe valve features an advanced double sealing system consisting of a metal bellows and a back‑up packing, completely eliminating stem leakage. With socket weld ends designed for Class 800 service, it is the ideal choice for critical applications such as high‑pressure steam, thermal oil, toxic or hazardous fluids, and valuable media. It is widely used in chemical, power, and pharmaceutical industries where environmental compliance and operational safety are paramount.

2. Basic Specifications

3. Material Specification

4. 主な特徴

4.1 Zero Leakage Bellows Seal

• Double sealing safety – The bellows + packing configuration provides a primary seal (bellows) that eliminates stem leakage, plus a secondary packing seal for added protection.
• Long fatigue life – Bellows are tested for over 10,000 cycles to ensure reliable performance under frequent operation.
• Environmental compliance – Achieves zero stem leakage, meeting ISO 15848 fugitive emission standards for safer, more environmentally friendly operation.

4.2 High‑Pressure Globe Valve Advantages

• Flow direction “low in, high out” – Media enters below the disc, ensuring tight shut‑off as system pressure assists sealing.
• High‑pressure sealing reliability – Disc and seat are hardfaced with Stellite for high hardness, wear resistance, and erosion resistance under high differential pressure.
• Blowout‑proof stem – Stem design prevents ejection under pressure.

4.3 Socket Weld Connection

• Provides a permanent, leak‑free joint ideal for high‑pressure, high‑temperature, and hazardous media.
• Socket weld design offers high mechanical strength and long service life when properly installed.
• Conforms to ASME B16.11 for dimensional standardization and interchangeability.

5. Testing & Standards

6. Installation & Maintenance Notes

6.1 Installation Precautions

• Flow direction – Globe valves are directional. Install according to the flow arrow on the body (flow under the disc).
• Socket weld welding:
• Fully open the valve before welding to prevent heat damage to the bellows and sealing components
• Allow proper expansion gap in the socket (typically 1.5 ~ 2.5 mm)
• Use TIG or SMAW welding; allow slow cooling after welding to avoid thermal stress concentration
• Flanged ends (if applicable) – Use appropriate gaskets and tighten bolts evenly in a cross pattern.

6.2 Operation & Maintenance

• Operating torque – Do not use extensions or excessive force on the handwheel. When closing, turn the handwheel until resistance is felt; for high‑temperature service, re‑tighten slightly after the system reaches operating temperature.
• Periodic inspection – Although the bellows is designed for long life, regularly inspect the packing area for any signs of leakage as an added safety measure.
• Maintenance – After any repair, the valve must be pressure tested and the bellows integrity verified.

7. Approximate Dimensions (for reference)

Note: Final dimensions are subject to the specific design; certified GA drawings should be referenced for engineering purposes.

Remarks:

1. This valve is recommended for high‑pressure steam, thermal oil, toxic, and valuable media. Material selection should be verified based on actual service conditions.
2. For actuated versions (electric or pneumatic), an ISO 5211 top mounting flange is available upon request.

保証:

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