Holmbury / HP Series / High Pressure / High Flow


High Pressure / High Flow Flat Face Couplings

Coupling Category

Flat Face Couplings



High pressure plant and equipment operating on mineral oil. Rail industries, torque wrenches and bolt tensioners.

HP Series couplings have been designed for use in systems working at pressures up to 720 bar.
There are two basic sizes, the A5HP and A9HP. One of the most important benefits of these couplings is ‘no fluid spillage on disconnection’. The high flow ratings of these couplings make them ideal for use with high pressure motorised power units, particularly when low pressure loss is important.

HP Series couplings incorporate a unique safety feature to prevent accidental disconnection - a spring loaded locking sleeve.
When the coupling halves are connected, the locking sleeve automatically rotates through 90°.
To disconnect the coupling the locking sleeve is turned back 90° so the locking ball is aligned with the release notch. The sleeve is then pulled back and the coupling will disconnect.

  • Flat faces can easily be wiped clean before connection to prevent the ingress of contaminants into the circuit.
  • Clean disconnection - non-spill design.
  • No air intrusion during connection.
  • Streamlined flow path minimises pressure drop.
  • Locking sleeve prevents accidental disconnection.
  • Bi-directional flow

Zinc plated carbon steel body with a 302 stainless steel spring. Nitrile rubber and PTFE seals. Other seal materials available on request.

Pressure Ratings
Size Maximum working pressure (bar) Burst pressure coupled (bar) Burst pressure male (bar) Burst pressure female (bar)
A5HP 720 1800 2000 1800
A9HP 720 1500 2000 1500
Type and size Nominal diameter A B C D E F G H I K L Connection force (N) Weight (kg)
A5HP 5 1/4" 22 22 48 29 58 95 24 24 16.6 12.5 150 0.3
A9HP 9 3/8" 27 30 61 34 70 114 30 32 19.5 14.5 155 0.46
Holmbury / HP Series / High Pressure / High Flow
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