series DD

Clean-break coupling for high pressure and high temperature up to 350 bar and 250 °C – (NW 6, 9, 12, 16)

The DD series is a clean-break coupling for high pressure up to 350 bar and high temperatures up to 250 °C. It is available as a leak-free dry coupling in nominal sizes NW 6, 9, 12 and 16 and is suitable for aggressive liquids and gases.

Product overview

The DD series is a clean-break coupling (dry coupling) designed for demanding industrial applications involving high pressure and temperature loads. It enables safe, leak-free coupling and uncoupling, and minimises media loss and air ingress.

Technical data

• Clean-break coupling (drybreak coupling)
• Nominal bores: NB 6, 9, 12, 16
• Pressure range: up to 350 bar
• Temperature range: up to 250 °C
• Media: corrosive liquids and gases
• Materials: stainless steel
• Seal: FFKM
• Standards: PED, optional ATEX

Suitable for which applications?

The DD series is ideal for:

• High-pressure applications above 200 bar
• High-temperature processes up to 250 °C
• Chemical and pharmaceutical industries
• Corrosive or critical media

Clean-break coupling in various nominal sizes

• NB 6 – compact for lower flow rates
• NB 9 – tried and tested for applications above 200 bar
• NB 12 – for medium flow rates
• NB 16 – for high flow rates

What is a clean-break coupling (dry coupling)?

Clean-break couplings are leak-free dry couplings that prevent the escape of fluids when disconnected and prevent the ingress of ambient air when connected.

Advantages of clean-break technology

• no media leakage
• no contamination
• high process and operational reliability

Frequently Asked Questions / FAQ

Which clean-break couplings are suitable for pressures above 200 bar?
→ DD series up to 350 bar

In which nominal diameters (NW) is this series available?
→ Available in nominal diameters (NW) 6, 9, 12, 16.

Is the coupling suitable for high temperatures?
→ Yes, up to 250 °C – higher temperatures available on request.

All about WALTHER-PRÄZISION’s Clean-Break programme: → Clean-Break Couplings (DRybreak) up to 650 bar / 10,000 psi