PTFE Bellows & Expansion Joints
Vibration & Misalignment Absorption
Flexible PTFE Expansion Joints
Sag Engineers manufactures precision convoluted PTFE Expansion Bellows designed to protect piping systems, pumps, columns, and fragile glass equipment from severe mechanical vibration, axial expansion, and angular misalignment.
Product Specifications & Designs:
- QVF Bellows: Designed specifically for borosilicate glass piping systems, reactors, and fragile condenser attachments
- Line Expansion Bellows: Heavy-wall convoluted bellows for PTFE-lined and metal piping systems
- Valves with Spindle: Bellows seal assemblies for zero-emission glandless control and shutoff valves
- Stirrer & Agitator Bellows: Flexible boots isolating motor vibration in chemical reaction vessels
- Metering Pump Bellows: Hermetically sealed flexible piston chambers for glandless dosing pumps
- Standard Sizes: 25mm NB (1") onwards up to 300mm NB (12") standard stock (larger custom diameters on order)
- Flange Options: Supplied with or without Aluminium, Ductile Iron, or Carbon Steel flanges and limit tie-rods
Convolution Profiles Explained:
'V' Section Convolutions: Highly flexible and extensible, providing maximum axial travel; ideal for low-pressure lines and vacuum systems.
Rounded (U-Section) Convolutions: Engineered with heavier root thickness and external stainless steel reinforcing rings, suitable for high-pressure service up to 10 Bar.
Operating Temperature: Continuous operating range from -50°C up to +200°C under severe corrosive exposure.
Standard Bellows Sizes & Convolution Options
| Nominal Bore (NB) | Standard Flange Standard | No. of Convolutions | Axial Compression / Extension | Flange Material |
|---|---|---|---|---|
| 25mm NB (1") | ANSI 150# / DIN PN10 | 2, 3, 5 convolutions | ± 10mm to ± 25mm | Carbon Steel / Stainless Steel / Al |
| 40mm NB (1½") | ANSI 150# / DIN PN10 | 2, 3, 5 convolutions | ± 12mm to ± 30mm | Carbon Steel / Ductile Iron |
| 50mm NB (2") | ANSI 150# / DIN PN10 | 2, 3, 5 convolutions | ± 15mm to ± 35mm | Supplied with limit tie-bolts |
| 80mm NB (3") | ANSI 150# / DIN PN10 | 2, 3, 5 convolutions | ± 18mm to ± 40mm | Supplied with limit tie-bolts |
| 100mm NB (4") | ANSI 150# / DIN PN10 | 2, 3, 5 convolutions | ± 20mm to ± 45mm | Supplied with limit tie-bolts |
| 150mm to 300mm NB | ANSI 150# / DIN PN10 | Custom as per travel | Engineered to order | Reinforced with SS root rings |