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Seal Proof

Teflon Bellow Seals

Outside-mounted PTFE bellows seal for extremely corrosive services, in single or multi spring form.

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Seal characteristics
Single acting · Outside mounted · Multi spring & single spring design · Independent of direction of rotation
Shaft diameter d1
19mm to 150mm
Temperature t
-45°C to +120°C
Seal Proof Teflon bellow seal — PTFE convoluted bellows behind an outside-mounted seal face.

Overview

A single-acting, outside-mounted seal using a PTFE bellows as the secondary seal, available in both multi spring and single spring designs and independent of direction of rotation.

Intended for extremely corrosive services. Faces are supplied in GFT, CFT, silicon carbide or ceramic; springs in Teflon-covered spring steel, SS 316, SS 304 or Hastelloy-C.

Specifications

Seal characteristics
Single acting · Outside mounted · Multi spring & single spring design · Independent of direction of rotation
Shaft diameter d1
19mm to 150mm
Temperature t
-45°C to +120°C provisionalPublished as "-45 ….+1200C". The trailing 0 before C is the lost degree symbol. 1200 °C is not a possible reading: this seal uses a PTFE bellows, and PTFE decomposes near 260 °C. Provisional pending confirmation by Seal Proof Engineering.
Pressure p
6 bar (max)
Velocity v
16 m/sec

Contact our engineering team for application-specific specifications.

Materials of construction

  • Face materials: GFT / CFT / Silicon Carbide / Ceramic
  • Metal parts: SS 316, SS 304, Hastelloy-C
  • Springs: Teflon Covered Spring Steel, S.S.316, S.S.304, Hastelloy-C
  • Secondary seal: PTFE Bellows

Applications

  • Extremely corrosive services

Related products

Next step

Tell us the duty.

Media, temperature, pressure, shaft size and speed are usually enough for our engineers to specify teflon bellow seals for your equipment.

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