Macdonald Couplings

Macdonald Couplings

There are a wide range of Macdonald Couplings that can be implemented for a variety of uses and functions.


For example the quick action couplings are specifically designed for high pressure macdonald_Couplingmcompressed air or inert gas. It is imperative that materials and fittings that have been developed for use in these areas are always stringently checked and regulated as improper hardware can result in poor performance, safety risks and potentially leakage or spillage of product.

Macdonald couplings are often sued in oil refineries, chemical plants that deal with nitrogen service and within the engineering industry. They are also implemented into systems that deal with pneumatic tools, as well as within the emergency fire services when operating fire hose reel services. For these uses, safety is a prime concern and needs to be monitored constantly.

The Macdonald bayonet couplings are safe and reliable whilst still being quick and easy to install within a hosing or pipework system. Standard Quick Action Couplings are bayonet style couplings which are used in pairs. A pair of couplings comprises a female and male coupling which are connected together by a push and quarter turn. Once connected, the spring loaded sleeve of the male couplings prevents accidental disconnection. The specialist couplings and fittings allow for effortless separation without the risk of the connections coming apart. They are ideal for applications where a robust fitting is required, as the straight link allows for very high flow rates. The direction of fluid flow is from female to male on all Macdonald quick action couplings.

These type of couplings have the standard ‘O’ seal is made from oil resistant rubber. They are functional in the temperature range from -30°C to 100°C. This type of nitrile rubber is suitable for use with mineral oils, water and steam. If you require higher temperatures, the couplings are also available with Viton as an alternative sealing material. This has a temperature range from -20°C to 200°C.

The standard material that the Macdonald couplings are manufactured from is bright mild steel and the metal parts or sections are zinc plated. This does not include springs and clips which are formed from stainless steel.

For different uses and specific requirements, couplings can be supplied in alternative materials such as stainless steel or brass. They can also have the separate type of Viton seal installed as substitute for the nitrile rubber. The maximum safe working pressure for hose ends depends on the particular hose specification and type of hose clamps used. When using hose tail couplings, pressure will be governed by the method of clamping hose to tailpiece, which must be regulated to withstand pressure without blow-off.