Quick Release Couplings
Quick Release Couplings

Quick Release Couplings: M.I.L. Standard

  • Robust, reliable and simple to install
  • Manufactured in Brass, Plastic and Stainless Steel
  • Sizes ranging from ¼" to 3" diameter
  • Interchangeable with: Hanson HK Series, Snaptite 72, Parker 60, Rectus 70KB and Aeroquip AD45
  • Special seals including PTFE Viton Encapsulated PTFE Energised available on request

Eldon couplings are fitted with Viton Shore 75 seals as standard giving the coupling a temperature range of -20°C to +200°C.

Customers requiring other high grade Elastomeric or PTFE seals fitted should contact their suppliers.

Couplings are produced with BSPP threads as standard.

NPT threads can be supplied on request.

All dimensions are only intended to used as a guide.

Exact dimensions are available from our sales team.

Maximum recommended working pressure (BARS)
Sizes(inches) Brass Stainless Steel
  Working Burst Working Burst
¼ 320 1300 500 2100
¾ 300 1200 400 1800
½ 300 1200 400 1800
¾ 240 750 350 1800
1 170 500 200 835
1 ¼ 170 500 200 835
1 ½ 170 500 200 835
2 122 470 175 700

Contact our sales team if pressure ratings are above the figure stated. Working pressure is based on M.I.L-c-25427 which allows pressure peaks 50976 above working pressure.

Calculating Pressure Drop

Pressure drop can be calculated using the following formula: Pressure Drop = (Litres/M in) ² (CV x 3.8) On connection/disconnection a small air inclusion/spillage occurs. Shown are the figures for the ¼ » - 1 » NB Coupling. Further information for larger couplings can be obtained from our sales team.
Size (inches) Spillage Air Inclusion
1/4 0.53cc 0.072in³
3/8 1.20cc 017in³
1/2 2.47cc 0.22in³
3/4 8.66cc 0.72in³
1 15.5cc 1.05in³

CV (Valve Co-efficients)

If the small spillage indicated above is unacceptable Eldon also produce a dry break coupling.

Eldon Couplings are interchangeable with Hanson HK Series, Snaptite 72, Parker 60, Rectus 70KB and Aeroquip AD45 couplings.

CV (Valve Co-efficients)
1/4 3/8 1/2 3/4 1 1 1/4 1 1/2 2
1.12 1.91 3.18 8.17 11.42 25.31 35.10 49.98
Coupling Chart
Dimensions
Size (inches) A B C D E F
1/4 1 1/4 15/16 1 1/8 1 7/16 7/16 ¾
3/8 2 5/8 1 1 7/16 1 5/8 1/2 7/8
1/2 3 1 ½ 1 3/4 1 15/16 11/16 1 1/8
¾ 3 3/4 1 9/16 2 1/4 2 3/8 3/4 1 3/8
1 4 1/4 1 7/8 2 9/16 2 1/2 15/16 1 5/8
1 1/4 4 3/4 3 3 1/4 4 3/4 2 11/16 3
1 1/2 4 3/4 3 3 1/4 4 3/4 2 11/16 3
2 5 9/16 4 4 1/8 5 1/2 2 7/8 4