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Self-closing, dry-break couplings

Coupling and uncoupling without leakage
Self-closing, dry-break couplings

Hose couplings which need to be joined and separated frequently in order to fill a tank represent a potential source of leaks. As a result, demands for self-closing, dry-break couplings are becoming increasingly common. A complete assortment of couplings ranging from 3/40 to 60 in size is now available.

These couplings, which are made of aluminium, brass or stainless steel, are fitted with seals capable of resisting the majority of aggressive media. The male and female parts of the couplings are simply joined together with a slight twist. The two half couplings must first be fitted together before the valves inside them can open, allowing the product to be dispensed. Conversely, when the tank is full, the internal valves close. This causes the seal between the case and the atmosphere to be opened, allowing the half couplings to be separated again.

The valves can be installed reliably on both the hose and tank sides either by means of a thread or with a flange. The main advantages of this coupling principle are as follows:
• The time-consuming task of draining residues out of the hose or pipe system is no longer necessary,
• the couplings cannot be opened without the mating part,
• there is no possibility of accidents as a result of aggressive media escaping,
• a simple twist movement, supported by integrated swivel joints, is all that is needed to join or separate the couplings,
• coupling types are available for almost all liquid and gaseous media.
Gossler-Todo dry-break couplings are used all over the world and have qualified for numerous approvals, for example from TÜV, Shell, AIR BP, ADR, British Rail, etc.
Vehicle refuelling with liquefied petroleum gas
A special 10 coupling system has been developed for this purpose. It is based on the proven Gossler-Todo-Matic coupling system, and thus complies with demands for faster refuelling times and reduced emis-sions. The coupling has a maximum working pressure of 25 bar and boasts a fivefold improvement in safety. It is joined and separated under operating pressure. The volume of liquid released at the point of separation is normally less than 0.2 cm³. The valve mechanism opens automatically as soon as the connection is made and closes again before it is separated. It is not possible to make an unsafe connection or to separate the connection in an unsafe way. The „human error“ factor thus becomes totally insignificant as far as LPG filling stations are concerned. The time required to refuel is usually shorter than with diesel and a flow velocity of up to 200 l/min is no problem at all.
Safety breakaway coupling for pipes and hoses
This breakaway coupling is actually a safety valve. It prevents hazardous media from escaping in an uncontrolled manner when a road tanker drives off or rolls away, a rail tanker is marshalled or a ship drifts away. If the tensile force exceeds a defined value, the connection between the hose and the valve is separated and the two halves of the valve are closed absolutely tight, so that leakage is impossible.
The Gossler-Todo safety breakaway coupling is designed with a flapper mechanism, which closes the valves after the half couplings have been separated. The half couplings are thus already fully closed before the main seal between the case and the atmosphere is opened. Leakage losses are consequently restricted to an absolute minimum. The valve system is moreover extremely compact and designed to ensure a high flow rate, so that there is only negligible pressure loss. The
couplings are available in 2 1/20 and 30 versions. 1 1/20, 20 and 40 variants will be offered shortly. Stainless-steel materials and Viton seals are used as standard. Other coupling and seal materials can be supplied on request. Either flanged or threaded connections are possible.
Gossler Fluidtec
Fax: ++49/40/72709228
Further information cpp-246
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