Details

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A Dry Disconnect Coupling (often called a Dry Break Coupling) is a quick-connect fluid transfer device designed to prevent spills, leaks, and contamination when connecting or disconnecting hoses, pipelines, or tanks.
It is commonly used in industries handling hazardous, flammable, or high-value liquids where safety and cleanliness are critical.

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Construction

1. Main Components

   • Coupler (Hose Unit) – attaches to the hose end.

   • Adaptor (Tank Unit) – fixed to the tank, manifold, or piping.

2. Valve System

   • Both coupler and adaptor contain internal valves that automatically close upon disconnection to prevent fluid loss.

3. Materials

   • Body: Aluminum, stainless steel, brass, or composite.

   • Seals: Viton®, EPDM, NBR, PTFE, or other elastomers compatible with the fluid.

4. Connection Method

   • Push-and-turn locking system, typically with three-lug bayonet or cam profile.

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Typical Specifications

• Size Range: DN25 (1") to DN150 (6")

• Working Pressure: Up to 16 bar (232 psi), higher for specialized designs

• Temperature Range: –20 °C to +80 °C standard (higher with special materials)

• Flow Rate: High flow with minimal pressure drop due to full-bore design

• Standards: Often compliant with NATO STANAG 3756, API RP1004, or EN 14432

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Applications

• Petroleum & Fuels – truck loading/unloading, aviation refueling, marine bunkering

• Chemical Industry – acids, solvents, and hazardous liquids

• Food & Beverage – edible oils, syrups, and beverages with hygienic versions

• Pharmaceutical – high-purity liquid transfer

• Marine & Offshore – transfer of fuels, lubricants, and chemicals to ships or rigs

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Advantages

• Spill Prevention – minimal product loss during disconnection

• Operator Safety – reduces exposure to hazardous liquids and vapors

• Environmental Protection – prevents soil and water contamination

• Quick & Easy Operation – push-turn connection saves time

• Versatility – available in multiple materials and seal types for different media