DIXON catalog · MannTek

MannTek Dry Disconnect and Breakaway Couplings

No-spill couplings for fuels, chemicals, liquefied gases and LNG: connect and disconnect in one motion, valves close automatically.

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MannTek (Mann Teknik AB, Mariestad, Sweden) — “the original since 1995”, a DIXON group company. MannTek makes the world’s widest range of dry disconnect couplings — in almost any metal and many composite materials, with seals for temperatures from −196 to +280 °C and the largest variety of connections. Equipment is certified by Lloyd’s, TÜV, Bureau Veritas, Apragaz and TDT.

How it works: push and turn — full flow; turn and pull — closed. The valve cannot open until the coupling is connected and closes automatically on disconnection. No need to drain hoses or pipework; spillage on connection and disconnection is eliminated.

DDC — dry disconnect couplings for liquids and chemicals

Dry Disconnect Couplings (DDC)

MannTek

DDCs are designed for transferring liquids, fuels, chemicals and gases. Integrated valves open and close the flow in one turn with minimal product loss. The connection interface is standardised to STANAG 3756 and ASTM F1122; the bayonet principle ensures worldwide interchangeability.

Applications: loading and unloading of road and rail tankers and ships, process plants, ISO and IBC containers, pharmaceutical and petrochemical industries; inks, adhesives, fatty acids, liquid soaps, petroleum products, agrochemicals, caustics and acids.

Powerful handle — many options for the task
Rubber protective ring — weather-resistant and electrically conductive
Integrated swivel on the hose unit, stainless steel shaft in PTFE — no seizing
Inner cam curve protected from impact
Design 2.0: up to +43% flow, up to −55% coupling force, connection indicator

Sizes: 1"–8"
Materials: aluminium, brass, stainless steel, Hastelloy, titanium, PVDF, PEEK etc.
Seals: FKM, NBR, EPDM, FFKM etc.
Working pressure: 10–25 bar (fivefold safety factor)
Connections: BSP/NPT threads; ANSI, EN, TW, TTMA, JIS flanges

Size	Socket	Flow, up to
1" (DN25)	56 mm	380 L/min
2" (DN50)	70 mm	1,400 L/min
2½" (DN65)	105 mm	2,300 L/min
3" (DN80)	119 mm	3,200 L/min
4" (DN100)	164 mm	5,400 L/min
6" (DN150)	238 mm	12,000 L/min
8" (DN200)	272 mm	20,000 L/min

DDC options and accessories

Colour coding of body, flange and handles by media
Selectivity (coding) system — pins and slots prevent product mixing
Stop Before Disconnect — leak check before disconnection
Locking device against unintended opening (pump vibration)
Pressure equalising valve
Drain connection for draining, venting and sampling
Hose unit with integrated breakaway
Dust caps and plugs
Steam version: stainless steel, EPDM, 150 psi at 177 °C, ¾"–2"

DEC — Dry Evotek

chemicals, food, pharmaceuticals

A new generation of dry disconnect couplings, ergonomically designed for coupling against pressure. Minimal dead space — very little product remains in the coupling: excellent cleaning and draining, minimal contamination risk. The mechanism is external, making cleaning easier.

Flanged version in one piece — no screwed or welded flanges; eccentric flanges available
Composite (standard) or aluminium handles also act as a protective ring
Made from solid bar; all wetted parts FDA-approved

Sizes: 1", 1¼", 1½", 2", 3"
Materials: stainless steel, Hastelloy
Seals: FKM, NBR, FFKM, PTFE
Pressure: 25 bar

AdBlue

dry disconnect couplings for urea

Dry disconnect couplings for AdBlue transfer (DEF / AUS 32 — 32.5% urea solution in water, ISO 22241 / DIN 70070) for SCR systems on diesel vehicles. No-spill transfer from IBC and ISO containers and tank trucks. Made to STANAG 3756.

2" (70 mm socket): stainless steel — standard for IBC containers
3" (119 mm socket): stainless steel — for ISO containers and tank trucks
Important: AdBlue freezes below −11 °C

DGC and rDME — dry gas couplings for LPG

Dry Gas Couplings (DGC)

MannTek

Originally designed for liquefied petroleum gas (propane and butane), today used for many other gases. Designed and manufactured to international standards including EN 13175. Connection and disconnection at elevated pressure; no need to empty the hose or loading arm between fillings — the product stays in the liquid phase, making a wet-hose concept possible.

Applications: loading and unloading of road and rail tankers, ships and bobtails, delivery to customer storage tanks, sampling; dual-fuel fracking operations.

Unique low-temperature FKM/LT seals — for all LPG grades and operating temperatures
Integrated swivel, inner cam curve
Design 2.0: up to +45% flow, up to −40% coupling force
ACME and Whitworth threads for direct fitting to existing connections

Sizes: 1"–8"
Material: stainless steel
Working pressure: 25 bar
Temperature: down to −50 °C
Flow 1" (DN25): up to 460 L/min

DGC accessories

Stop Before Disconnect — leak check in the tank unit
Pressure equalising valve
Safety pressure cap with overpressure indicator — ADR/RID approved as a third closure
Tank units with eccentric flanges 1"–6" — no liquid left behind
Overpressure bleed valve for thermal expansion
Hose unit with integrated breakaway; tank unit with short piston

rDME Couplings

Developed from the DGC for rDME at any concentration — for blending rDME into LPG. To prevent cross-connection, they connect with an anticlockwise turn — the opposite of DGC.

Size: 2"
Material: stainless steel
Seals: FFKM
Pressure: 25 bar

DCC — cryogenic couplings for LNG

Dry Cryogenic Couplings (DCC)

MannTek

DCCs are designed for transferring cryogenic liquids and gases — LNG, nitrogen, oxygen, argon, ethylene — at temperatures down to −196 °C. Standardised interface to ISO/TS 18683 and ISO 21593. Unlike flanges and threads, no retightening is required during cool-down.

Tested under cryogenic conditions for more than 10,000 connection cycles; more than 25,000 LNG transfers completed. Applications: ship bunkering, ship-to-ship, filling LNG tank trucks and containers, rail tank cars, process plants.

Connect and disconnect in seconds
Wet disconnection possible; no draining or purging needed
The valve cannot open until connected and closes automatically

Sizes: 1"–8"
Material: stainless steel
Seals: PTFE

Size	Socket	Flow, up to
1" (DN25)	56 mm	250 L/min
2" (DN50)	70 mm	900 L/min
2½" (DN65)	105 mm	2,100 L/min
3" (DN80)	119 mm	2,800 L/min

Aviation fuel

Dry Aviation Couplings (DAC)

MannTek

Designed to ISO 45 and STANAG 3105 for aviation fuel; used at almost any point in the fuel supply chain: loading and unloading of tank trucks and refuellers, defuelling, defence applications. Not intended for into-plane (underwing) refuelling.

Size: 2½"
Materials: aluminium, stainless steel; no yellow metals in contact with the media
Seals: FKM, NBR, low-temperature
Pressure: 10 bar

Sampling, vent and drain unit

for airport hydrant systems

At airports fuel is delivered through underground pipelines; condensate collects at low points and air at high points. MannTek units are installed at low points to drain water and at high points to vent air. Tank unit with pressure relief and equalising valve, flange with dip pipe, dust cap.

Version: stainless or carbon steel (epoxy coated)
Working pressure: 20.7 bar (300 psi)
Relief valve setting: 20 ± 2 bar
Test / burst: 31 / 62.1 bar
Temperature: −30…+200 °C
Connection: 6" ASA 300 psi flange, 2" ball valves

Full flow ball valves

MannTek

One- or two-way valves for tank trucks, refuellers, mobile fuelling units and containers. Petrol, diesel, jet fuel; maximum flow with minimum pressure drop.

Sizes: 1-way 2", 3", 4"; 2-way 2", 3"
Material: aluminium (no yellow metals)
Pressure: 10 bar

SBC and CBC breakaway couplings

Breakaway couplings prevent spillage and damage from drive-away or pull-away incidents during loading and unloading. They are designed to be the weakest link of the hose line or loading arm.

Safety Breakaway Couplings (SBC)

MannTek

The poppet valve design avoids damaged valve seats and over-rotating flip valves. On emergency release the coupling separates and the valves of both halves close instantly. It operates independently of emergency shutdown systems, needs no external power and can be reset on site by one person.

Industrial type — releases at any angle 0–90°, installed to at least one fixed point
Marine type — releases only on a straight pull, installed between two hose strings (ship-to-platform, ship-to-ship)
Cable release type
Breaking load calculated for each installation; withstands high side loads

Sizes: 1"–12" (cable release — 1"–8")
Materials: aluminium, stainless steel, brass
Seals: FKM
Pressure: up to 25 bar (depends on material)
Connections: ANSI/DIN flanges, BSP/NPT threads

Cryogenic Breakaway Couplings (CBC)

for LNG and cryogenic media

For liquefied gases — LNG, nitrogen, oxygen, argon, ethylene — down to −196 °C. Three versions: breaking pin, cable release and PERC. Unique ice-breaking function.

Sizes: breaking pin 1"–8", cable release 2"–8"
Material: stainless steel
Seals: PTFE
Pressure: 25 bar
Application: container discharge, bunkering, loading of tank trucks, rail tank cars and ships, vapour recovery lines

Swivel Joints

MannTek

Allow free rotation of nozzles, couplings and other equipment on hoses, pipework and manifolds; prevent hose twisting, extend service life and make handling easier. Standard and heavy-duty (for high side loads).

Sizes: ¾"–10" (single ¾"–4", double 1"–10")
Materials: aluminium, brass, stainless steel
Seals: FKM, NBR, EPDM, FFKM, PTFE
Pressure: 16–25 bar

LNG transfer systems

MannTek systems are used in ship-to-ship, shore-to-ship and truck-to-ship operations and at rail and truck loading terminals. In 2013 MannTek couplings enabled the world’s first ship-to-ship LNG bunkering (the Viking Grace ferry and the Seagas bunker vessel, Stockholm): connection and disconnection within one minute, with no gas release.

System components

DCC — dry cryogenic coupling
CBC — cryogenic breakaway coupling
PERC — powered emergency release coupling: 100% shut-off of both halves; three release methods — ESD signal, manual override, passive breaking pin
HPN2 — high-pressure nitrogen release and monitoring system (SIL1/SIL2), with a pilot regulator against moisture and ice
VSD — vessel separation device: two wires of different lengths trigger ESD1 (pumps stop, valves close) and ESD2 (PERC release)
LNG hoses — composite or stainless steel, 1"–10", 10–25 bar
Accessories: hose lifting device and saddles, hose fall-arrest system, heated parking device, insulating flanges, reels, nitrogen purge lines

Safety: SIL2 — assessed and certified by DNV-GL (IEC 61508, IEC 61511)
Standards: EN 1473, EN 1474-3, ISO 16904, ISO 18683, ISO 20519, ISO 28460, EN 12434, ISO 13849

New fuels

MannTek develops solutions for hydrogen (including liquid hydrogen for trucks, trains, ships and aviation), methanol, ammonia, CO₂ capture and transport, as well as aviation and road refuelling and ship bunkering systems. Projects include crew training, service and 24/7 support for the whole service life.

Descriptions and specifications are given according to the manufacturers and may change. Please confirm parameters with our specialists before ordering.

Questions and answers

Frequently asked questions

How does a dry disconnect coupling differ from cam & groove?

A dry disconnect has valves built into both halves: no product escapes on connection or disconnection, and the valve cannot be opened until the coupling is connected. A cam & groove coupling is a simple quick-connect fitting without valves.

Are MannTek couplings compatible with other manufacturers’ couplings?

DDCs are made to STANAG 3756 and ASTM F1122, DGCs to EN 13175, DCCs to ISO/TS 18683 and ISO 21593, DACs to ISO 45 and STANAG 3105, so they are interchangeable with products made to the same standards.

How do I select a breakaway coupling?

We need the media, size, pressure, connections and installation layout (fixed point or hose on both sides). The breaking load is calculated for the specific installation.

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