Bow Couplings

Turning Glands

Pinch Ball Joints

Ball Joints




In our period as Van De Graaf we invented the bow coupling, which became the standard in the world. With our bow coupling (also know as bow discharge installation) a quick connection can be made between the ship and the floating pipe line. This installation is designed for efficient beach and land reclamation. Quick connection and low maintenance ensure safe working under most all circumstances and tough weather conditions. We guarantee exchangeability between our systems.

The bow discharge installation consists of the following main parts:

  • Construction:
    Guide ring and gantry construction for integration into the bow section.
  • Bow coupling:
    – female part;
    – loose male part with floater for the connection with the floating pipe line.

Technical specifications:
For inside pipe diameters : ø 350 – ø 1.100 mm.
Maximum swivel angle male part : 15°
Turning angle male part : > 360°
Maximum operating pressure : 10 – 30 Bar

Parts of the bow coupling

The bow coupling realizes the connection between ship and floating pipe line. The coupling itself consists of a female- and male part. The female part is fixed to the bend of the discharge pipe and the loose male part has to be mounted to the floating hose.
The female part is provided with hydraulic operated cylinders for opening/closing of the retaining ring and securing the lock pins. The retaining ring clamps or releases the male part when it is positioned in the female part. Heavy lock pins secure the retaining ring when the male part is connected.
The floater of the male part is a heavy duty construction and foam filled. The male part of the flexible coupling has an unlimited rotation.

Male part of a Straatman bow coupling ø900


All parts are produced and assembled in our factory in Holland!


Exchangeability between our couplings is guaranteed!


Proven in pratice for more than 30 years!

Recent bow coupling projects


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