Bellows and Flexible Hoses for Liquid Cooling Systems

Metal and rubber bellows for vibration absorption, thermal expansion compensation, and flexible connection in CDU pump interfaces and main distribution piping.
Choose Your Configuration
Flexible connections for CDU pump interfaces and main distribution piping — absorbing vibration and thermal expansion to prevent pipe rupture.
Not Sure Which Valve Fits Your Cooling Loop?
Every cooling loop has unique isolation requirements. Describe your application and our engineers will recommend the right butterfly valve type and configuration.
Our Advantages
The QINFENG Valve Difference
Automated Weld Quality
Automated Weld Quality
Fully automatic welding process — every seam uniform, no missed welds. Achieves zero leakage at 1.6MPa. Eliminates the micro-crack defects of manual welding that accelerate failure.
Electrolytic Surface Integrity
Electrolytic Surface Integrity
Post-weld electrolytic treatment removes surface micro-cracks — inner wall mirror-smooth. Corrosion resistance and fatigue life tripled, retaining metallic luster after five years.
Multi-Directional Compensation
Multi-Directional Compensation
Metal braided construction absorbs axial, lateral, and angular displacement. Compensates thermal expansion, vibration, and connection-end movement — protecting pump and heat exchanger interfaces.
Ultra-Clean Water Cleaning
Ultra-Clean Water Cleaning
Dedicated ultra-clean water cleaning process ensures absolute cleanliness. No particulate residue — safe for the purest coolant chemistries.
They Chose QINFENG:

Quality Assurance

Every assembly undergoes 100% helium leak detection at 1.6MPa — zero leakage verified. Weld seams inspected. Salt spray tested. High and low temperature cycling validates fatigue life. Material verified by spectrometer. Test reports available upon request.

Every hygienic valve undergoes 100% shell hydro and seat leakage testing — zero bubbles equals zero leak
Every hygienic valve undergoes 100% shell hydro and seat leakage testing — zero bubbles equals zero leak
Every hygienic valve undergoes 100% shell hydro and seat leakage testing — zero bubbles equals zero leak
Every hygienic valve undergoes 100% shell hydro and seat leakage testing — zero bubbles equals zero leak

* All bellows are 100% tested before shipment. Test reports available upon request.

What we provide
What we provide:

Valve sizing by your flow and pressure specs. Material compatibility analysis for your coolant type. Custom end connections (Tri-Clamp, weld, flange). Actuator selection support (manual, pneumatic, electric).

Frequently Asked Questions
Please let us know your basic requirements. Our technical team will respond within 24 hours.
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Why are metal bellows used in liquid cooling piping systems?

 
 

Metal bellows absorb thermal expansion, mechanical vibration, and connection-end displacement. They provide flexible connections that protect CDU pump interfaces and heat exchangers from stress-induced fatigue.

How does automatic welding improve bellow reliability?

 
 

Fully automatic orbital welding produces uniform seams with no missed welds or weak points. Achieves zero leakage at 1.6MPa — eliminating the micro-crack defects common in manual welding.

What does electrolytic surface treatment do for bellows?

 
 

Post-weld electrolytic treatment removes surface micro-cracks, creating a mirror-smooth inner wall. Corrosion resistance and fatigue life are tripled, retaining metallic luster after five years of continuous operation.

How does multi-directional compensation protect cooling system piping?

 
 

Metal braided construction absorbs axial compression, lateral offset, and angular deflection simultaneously. Compensates thermal expansion, vibration, and connection-end movement — protecting pump and heat exchanger interfaces.

Latest Updates
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Find the Right Valve Solution for Your Cooling System
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How we can help you:
  • Valve sizing, material compatibility, and flow path optimization
  • Prefabricated manifold and piping system design
  • 24-hour CAD drawings and sample support

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+86 86998350

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