DN25-PN25-SW Bellows Seal Globe Valve

Technical Data Sheet

Product: Bellows Seal Globe Valve
Size / Rating: DN25 – PN25 – SW (Socket Weld)

1. General Description

This bellows seal globe valve features an advanced double sealing system consisting of a metal bellows and a back‑up packing. It completely eliminates stem leakage, making it the ideal choice for critical applications such as high‑temperature steam, thermal oil, toxic or hazardous fluids, and valuable media. It is a direct upgrade from conventional packed globe valves and is widely used in chemical, power, and pharmaceutical industries where environmental compliance and operational safety are paramount.

2. Basic Specifications

3. Material Specification

4. Belangrijkste kenmerken

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 and reducing media loss for safer, more environmentally friendly operation.

4.2 Globe Valve Design Advantages

• Flow direction “low in, high out” – Media enters below the disc, ensuring tight shut‑off as system pressure assists sealing.
• Throttling capability – Suitable for both isolation and flow regulation.
• Easy maintenance – Top‑entry design allows internal components to be serviced without removing the valve from the pipeline.

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.

5. Testing & Standards

6. Installation & Maintenance Notes

1. Flow direction – Globe valves are directional. Install according to the flow arrow on the body (flow under the disc).
2. Welding precautions – For socket weld connections, fully open the valve before welding to prevent heat damage to the bellows and sealing components. Allow slow cooling after welding.
3. 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.
4. 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.

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 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.

GARANTIE:

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