Ptfe Bellows Expansion Joints

PTFE Bellows Expansion Joints are flexible pipeline compensators made with a PTFE bellows body. They are used in chemical processing, pharmaceutical production, food and beverage lines, semiconductor utilities, electroplating systems, and flue-gas desulfurization pipelines.

1. Pure PTFE wetted surface. The conveyed fluid contacts a continuous PTFE bellows rather than metal reinforcement. In strong acid, alkali, solvent, or high-purity service, the bore remains chemically inert and avoids galvanic attack or metal-ion contamination.

2. Repeatable movement without sharp folding. The formed convolutions spread bending strain across the active length. Axial, lateral, angular, and combined movement is shared across the bellows instead of being forced into one local fold, giving steadier cycling at reactor, tank, and pump connections.

3. Smooth non-stick internal bore. PTFE resists adhesion and buildup. In pharmaceutical, food, electroplating, or semiconductor lines, the smooth bore retains less material, is easier to flush, and is less likely to narrow between batches.

• Bellows diameter, face-to-face length, convolution count, wall configuration, and movement capacity can be designed around the approved pipeline data.
• Connections can use PP, PE, FRPP, or PTFE-lined steel flanges with project-specific drilling.
• Industrial-grade or food-contact PTFE is available for PN6 to PN16 service, with the temperature limit set from the confirmed medium and operating conditions.

PTFE raw material identity and molding condition are checked before forming. After molding, wall thickness, convolution spacing, bore finish, flange alignment, and surface integrity are inspected. Each finished joint receives a hydrostatic test at 1.5 times working pressure and an air-tightness test at 1.1 times working pressure. The bore is checked for pinholes, inclusions, and forming damage before final cleaning and packing. Third-party inspection is accepted.

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