PTFE Bellows

DEKOMTE manufacture a range of PTFE bellows to be used in special chemical and industrial applications.

Low Pressure PTFE Expansion Joints Type R-LD

PTFE multi-laminated tubes, that ensure an absolute minimum porosity and a homogenous wall-thickness, are transformed again under temperature and pressure to special high-quality bellows, with a high vacuum- and pressure resistance, even during a long period.

Installation Lengths for PTFE Bellows Type R-LD
INSTALLATION LENGTH TYPE R-LD
DN 2 Conv. 3 Conv. +/ Cons. ax. Mov. ± / - Conv. lat. Mov. ± / - Conv. lat. Mov. ± / - Conv.
25 45 55 12 5,5 3,5 8
32 55 65 13 5,5 3,5 7,5
40 55 70 15 6 4 7,5
50 60 70 16 6 4 6,5
65 60 80 20 6,5 5 6
80 65 90 24 6,5 5 6
100 70 95 25 7,5 5,5 5,5
125 75 100 25 8 5,5 5
150 75 105 25 8,5 5,5 4
200 80 110 25 9 6 3,5
250 90 120 26 10 6 3,5
300 95 125 26 10 6 3
350 100 125 26 10,5 6 3
400 100 135 26 10,5 6 2,5
500 105 140 26 11 6,5 2,5
600 105 140 26 11 6,5 2

High Pressure PTFE Expansion Joints Type R-HD

PTFE multi-laminated tubes, that ensure an absolute minimum porosity and a homogenous wall-thickness, are transformed again under temperature and pressure to special high-quality bellows, with a high vacuum- and pressure resistance, even during a long period.

Installation Lengths for PTFE Bellows Type R-HD
INSTALLATION LENGTH TYPE R-HD R-HD
DN 2 Conv. 3 Conv. +/ Conv. ax. Mov. ± / - Conv. lat. Mov. ± / - Conv. ang. Mov.± / - Conv.
25 45 55 12 3 2 4,5
32 55 65 13 3 2 4
40 55 70 15 3,5 2,5 4
50 60 70 16 3,5 2,5 3,5
65 60 80 20 4 3 3,5
80 65 90 24 4 3 3,5
100 70 95 25 4,5 3 3
125 75 100 25 4,5 3 3
150 75 105 25 5 3 2,5
200 80 110 25 5 3,5 2
250 90 120 26 5,5 3,5 2
300 95 125 26 5,5 3,5 1,5
350 100 125 26 6 3,5 1,5
400 100 135 26 6 3,5 1,5
500 105 140 26 6,5 4 1,5
600 105 140 26 6,5 4 1

Design and Movement of a PTFE Bellow

  1. Stainless steel support rings
  2. Limit bolts St/PE sleeved
  3. Flange - GGG 40 (0.7043), coated
  4. Threaded holes DIN or ANSI
  5. PTFE expansion join

Available on Request

  • Quality certificate according to Pressure Equipment Directive 97/23/EC
  • Conductive PTFE
  • Double wall bellows with cavity safety drain
  • Flanges in 304 Inox (1.4301), 316 Ti (1.4571), with or without certificate according to EN 10204 3.1
  • With non-standard connections
  • Support rings in Monel 400, Hastelloy C3, Hastelloy C4
  • Special fittings to avoid distorsion on longer bellows
  • Internal anti-deposit sleeve
  • Larger sizes up to ND 900
  • Standard flanges ASA 150 or DIN, others on request

p-T graph for PTFE bellow design

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