FAQ

  • Q Is stainless steel 304 or 316 better for steam?

    A
    316 stainless steel is more resistant to chloride ion corrosion and is more suitable for wet steam systems; 304 stainless steel is suitable for dry steam applications.
  • Q What is the difference between braided and unbraided?

    A
    The braided layer enhances radial pressure resistance and is suitable for high-pressure applications; the unbraided structure is lighter and suitable for vacuum/low-pressure applications.
  • Q What is a flexible metal hose?

    A
    A flexible metal hose is a flexible piping component composed of a corrugated tube, a braided layer, and end fittings.  It absorbs vibration and displacement through the elastic deformation of the corrugated tube, and is used to transport gas, liquid, or steam media.
  • Q How long is the production time?

    A
    The sample production cycle is 2-4 weeks, and the mass production cycle is 6-8 weeks, depending on the complexity and quantity of the customization.
  • Q Can I get a custom-size metal bellow?

    A
    Yes, custom sizes are available for outer diameter, length, end connections, etc., to meet specific application requirements.
  • Q What materials are best for high temperature?

    A
    Inconel alloys are resistant to high temperatures (≤1100℃) and are suitable for aircraft engines; titanium alloys are lightweight and corrosion-resistant, making them suitable for medical equipment.
  • Q Welded vs. formed bellows — what’s the difference?

    A
    Welded bellows have thinner walls and higher precision, making them suitable for sealing applications; formed bellows have stronger displacement compensation capabilities and are suitable for high-temperature and high-pressure conditions.
  • Q What are metal bellows?

    A
    Metal bellows are elastic components made from thin-walled metal materials through welding or forming processes, used to compensate for displacement, maintain sealing, and absorb vibration.
  • Q Contraction vs expansion joint – key differences

    A
    Contraction joints control shrinkage cracks (preventing cracking), while expansion joints absorb thermal expansion and displacement (preventing deformation). The two have different design principles but both are structural deformation control measures.
  • Q Both control joints (to control shrinkage) and expansion joints (to absorb thermal displacement) are needed in buildings; expansion joints are mainly used in piping systems, while control joints are mostly used in concrete structures.

    A
    A construction joint is a temporary joint for construction phasing, while an expansion joint is a permanent deformation joint (designed and pre-planned). The two are not interchangeable – the former is for construction needs, the latter for functional requirements.
  • Q Expansion joints are used to absorb thermal displacement and structural deformation, while control joints are used to control concrete shrinkage cracks. The two functions are complementary, but their application scenarios differ – both are needed in buildings.

    A
    Both control joints (to control shrinkage) and expansion joints (to absorb thermal displacement) are needed in buildings; expansion joints are mainly used in piping systems, while control joints are mostly used in concrete structures.
  • Q What is the difference between an expansion joint and a control joint?

    A
    Expansion joints are used to absorb thermal displacement and structural deformation, while control joints are used to control concrete shrinkage cracks.  The two functions are complementary, but their application scenarios differ – both are needed in buildings.
Currently, our products mainly include flexible metal hose, bellows expansion joint, corrugated pipe, metal compensator, fabric expansion joint, stainless steel braids, PTFE bellows, exhaust pipe and other products.

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Mobile(WhatsApp): +86-17321605009
Email: sales@jsbellows.com
Add: City East Development Zone, Jiangyan Area,Taizhou City, Jiangsu Province, China

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