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Compression Fittings

Compression Fittings. External nut type series 43. External nut (compression fittings). Rugged and durable General purpose Wide range of thread and tube sizes For use with compressed air, compatible oils and water Can be used with plastic or metal tube

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Compression Fittings

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  1. Compression Fittings External nut type series 43

  2. External nut (compression fittings) • Rugged and durable • General purpose • Wide range of thread and tube sizes • For use with compressed air, compatible oils and water • Can be used with plastic or metal tube • Suitable for low and high operating temperatures* • Vacuum to high pressure* * see tube pressures

  3. Thread and tube sizes • Threads range taperR 1/8, R 1/4, R 3/8, R 1/2, R 3/4, R 1 • Threads range parallelG 1/8, G 1/4, G 3/8, G 1/2 • Tube range mm o/d4, 6, 8, 10, 12, 14, 15, 16, 18, 22 • Materials • Nickel plated brass body and nut • Brass tubing sleeve Tube Thread

  4. Parts of a fitting • Tubing nut • Tubing sleeve • Body • Plastic washer on bodies with parallel threads

  5. Tube preparation

  6. 900 Tube preparation • For plastic tube use a standard tube cutter to give a square end • Ensure that the tube end is clean and free from surface damage • For metal tube use correct cutting equipment and ensure the tube end is free from burrs

  7. Tube assembly External nut compression fitting

  8. Tube assembly • Place the tubing nut and sleeve on to the tube • push the tube in up to the tube stop and hold it there • Screw the tubing nut until finger tight • With a spanner tighten the nut by 11/4 to 11/2 turns • Undo the joint and check the sleeve has been swaged evenly. Reassemble and tighten an extra 1/4 turn

  9. Tube assembly • Place the tubing nut and sleeve on to the tube • push the tube in up to the tube stop and hold it there • Screw the tubing nut until finger tight • With a spanner tighten the nut by 11/4 to 11/2 turns • Undo the joint and check the sleeve has been swaged evenly. Reassemble and tighten an extra 1/4 turn

  10. Tube assembly • Place the tubing nut and sleeve on to the tube • push the tube in up to the tube stop and hold it there • Screw the tubing nut until finger tight • With a spanner tighten the nut by 11/4 to 11/2 turns • Undo the joint and check the sleeve has been swaged evenly. Reassemble and tighten an extra 1/4 turn

  11. Tube assembly • Place the tubing nut and sleeve on to the tube • push the tube in up to the tube stop and hold it there • Screw the tubing nut until finger tight • With a spanner tighten the nut by 11/4 to 11/2 turns • Undo the joint and check the sleeve has been swaged evenly. Reassemble and tighten an extra 1/4 turn

  12. Tube assembly • Place the tubing nut and sleeve on to the tube • push the tube in up to the tube stop and hold it there • Screw the tubing nut until finger tight • With a spanner tighten the nut by 11/4 to 11/2 turns • Undo the joint and check the sleeve has been swaged evenly. Reassemble and tighten an extra 1/4 turn

  13. Tube assembly • Air pressure may then be applied

  14. Tube removal External nut compression fitting

  15. Tube removal (compression fitting) • Turn off and exhaust the pressure • Undo the tubing nut and pull out the tube • The tubing sleeve is permanently swaged to the tube • The joint can be made and remade many times • If the tube is cut to shorten it, a new sleeve is required but the tubing nut can be reused

  16. Tube removal (compression fitting) • Turn off and exhaust the pressure • Undo the tubing nut and pull out the tube • The tubing sleeve is permanently swaged to the tube • The joint can be made and remade many times • If the tube is cut to shorten it, a new sleeve is required but the tubing nut can be reused

  17. Tube removal (compression fitting) • Turn off and exhaust the pressure • Undo the tubing nut and pull out the tube • The tubing sleeve is permanently swaged to the tube • The joint can be made and remade many times • If the tube is cut to shorten it, a new sleeve is required but the tubing nut can be reused

  18. Tube removal (compression fitting) • Turn off and exhaust the pressure • Undo the tubing nut and pull out the tube • The tubing sleeve is permanently swaged to the tube • The joint can be made and remade many times • If the tube is cut to shorten it, a new sleeve is required but the tubing nut can be reused

  19. Fittings range External nut compression series 43

  20. Fittings range • Straight male adaptors taper • Straight male adaptors parallel • Straight female adaptors • Male elbow adaptors • Elbow banjo assemblies • Straight connectors • Elbow connectors • Plugs ( like a solid tubing sleeve ) • Reducing connectors

  21. Fittings range • Tee connectors • Male tee adaptors • Male side tee adaptors • Four way connectors • Bulkhead connectors • Straight stem adaptors • Stem tailpiece connectors • Tube supports for soft plastic tubing • Conical tubing sleeves and nuts for metal tubing

  22. End

  23. Higher temperatures OC 30 40 50 60 80 Pressure adjustment factor 0.83 0.72 0.64 0.57 0.47 Pressure rating Plastic tube O/D mm 4 5 6 8 10 12 14 16 22 28 bar maximum Polyamide (PA) 28 31 25 19 24 18 15 18 15 15 Polyurethane (PU) 10 11 10 9 9 9 Pressure values are for a temperature range -40 OC to +20 OC For compressed air above 16 bar consult our technical service

  24. OC 100 150 175 200 Annealed 0.97 0.82 0.63 0.43 Half Hard 0.95 0.88 0.54 0.29 Pressure rating Copper and steel tube O/D mm 4 5 6 8 10 12 16 22 28 bar maximum Copper Annealed 128 138 112 81 64 81 59 53 41 Copper Half Hard 193 208 218 157 150 122 89 81 62 Steel 300 250 195 160 Pressure values are for a temperature range -40 OC to +50 OC For compressed air above 16 bar consult our technical service Pressure adjustment factors

  25. Reducing connector • The ferrule has a bore to accept the smaller tube size • The ferrule makes a metal to metal seal in the fitting body • The tubing sleeve is for the smaller tube • The nut has a reduced tube diameter and seat

  26. Reducing connector • The ferrule has a bore to accept the smaller tube size • The ferrule makes a metal to metal seal in the fitting body • The tubing sleeve is for the smaller tube • The nut has a reduced tube diameter and seat

  27. Reducing connector • The ferrule has a bore to accept the smaller tube size • The ferrule makes a metal to metal seal in the fitting body • The tubing sleeve is for the smaller tube • The nut has a reduced tube diameter and seat

  28. Reducing connector • The ferrule has a bore to accept the smaller tube size • The ferrule makes a metal to metal seal in the fitting body • The tubing sleeve is for the smaller tube • The nut has a reduced tube diameter and seat

  29. Reducing connector • The ferrule has a bore to accept the smaller tube size • The ferrule makes a metal to metal seal in the fitting body • The tubing sleeve is for the smaller tube • The nut has a reduced tube diameter and seat

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