PTFE Lined Expansion Bellow
Absorbs axial expansion, lateral offset, and angular deflection caused by thermal cycling in fluoropolymer lined piping systems. Multi-convolution virgin PTFE bellows are reinforced with metallic root rings and limit rods to avoid over-extension.
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Quick ReplyKey Engineering Highlights
- Multi-convolution (2, 3, or 5 convolutions) molded virgin PTFE bellows
- High flexibility with superior fatigue cycle life
- Heavy-duty tie rods and limit bolts protect against over-compression/extension
- Absorbs pump and compressor vibration to protect brittle equipment
All components are manufactured in our specialized industrial facility located at GIDC Chhatral, Dist. Gandhinagar, Gujarat. The seamless fluoropolymer liner completely shields all wetted metal surfaces from chemical attack and fluid contamination.
Available Construction Variants
- 2-Convolution Bellow
- 3-Convolution Bellow
- 5-Convolution High Movement Bellow
| Technical Parameter | Verified Specification Standards |
|---|---|
| Product Designation | PTFE Lined Expansion Bellow (Thermal Expansion & Vibration Compensator) |
| Governing Standard | ASTM F1545 (Standard Specification for Plastic-Lined Ferrous Metal Pipe, Fittings, and Valves) |
| Flange Specification | ANSI B16.5 Class 150# / Class 300# Raised Face (RF) / DIN PN10 / PN16 |
| Available Sizes | 1" (DN25) to 12" (DN300) |
| Design Temperature Limit | -29°C to +180°C |
| Design Working Pressure | Full Vacuum to 10 Bar (convolutions dependent) |
| High Voltage Spark Test | 20,000 Volts DC non-destructive spark detection per ASTM F1545 |
| Hydrostatic Shell Test | 1.5 x Working Pressure (30 kg/cm² / 425 psi) for 3 minutes minimum |
| Pneumatic Seat Test | 6 bar air pressure with zero allowable bubble leakage |
| Custom Fabrication | Available on Request per client piping isometrics |
Lining Fluoropolymer Options
We select virgin grade fluoropolymers matched precisely to process chemistry and operating temperature:
- PTFE: -29°C to +200°C, universal chemical inertness, in-house paste extrusion.
- PFA: -29°C to +200°C, melt-processable, superior clarity and permeation resistance.
- FEP: -29°C to +150°C, high dielectric strength and smooth non-stick surface.
- PVDF / PP / HDPE: Cost-effective options for mild corrosive and water treatment lines.
Housing & Metallurgy Options
Rugged metallic outer shells provide high pressure containment and mechanical strength:
- Cast Steel: ASTM A216 Gr. WCB for heavy-duty pressure valves and fittings.
- Carbon Steel Pipe: ASTM A106 Gr. B seamless pipe spools with A105 flanges.
- Ductile Iron: ASTM A395 / GGG40.3 for economical vibration-absorbing installations.
- Stainless Steel: CF8 / CF8M (SS304/SS316) for highly corrosive external plant atmospheres.
