Different Applications for Different Hose Couplings
Added: (Thu Oct 14 2010)
Pressbox (Press Release) -
There are different types of hoses used for different purposes, such as garden hoses to fire hoses and oil hoses. However, other than the hose itself, its hose couplings are also different from each application. While other hose couplings are used in simple applications, such as for garden hoses, other couplings are used for a more sophisticated application.
What is a Hose Coupling?
A hose coupling or also known as hose adapters are used to connect one end of a hose to the other. Hose couplings are also used to connect a hose from a tap or in other sophisticated applications, such as in fire hydrants.
There are different types of hose couplings, and each type are made using different materials. For a common garden hose coupling, plastic and brass are normally used, while others are built for a more sophisticated application, in which material such as steel, stainless steel, and aluminum are used.
Different Types of Hose Couplings around the World
There are different types of hose adapters used across the world. Here are some of the most recognized types of hose couplings used in many countries:
Hozelock and Hoselink
Typical hose couplings used for garden hoses, a hozelock is normally a push-fit connector while a hoselink is a ayonet type connector utilizing an 0 Ring compression to provide a watertight connection for home and commercial garden hoses.
Machino and Nakajima
Both types of hose couplings are normally used for fire hoses in Japan. A Machino involves a quick connect and disconnect coupling used on fire hoses, while the Nakajima is a "quarter turn" or "sexless" coupling used on fire hoses in Japan.
NST and Expansion Ring
NST or National Standard Thread and Expasion Ring are types of hose adapters normally used in the US. The NST is considered as the most common type of fire hose coupling used in the USA while an Expansion Ring is commonly used on lay flay fire hose, which offers the advantage of providing no flow restriction, as the expansion ring is expanded to match the inner diameter of the hose. Compared to NST, Expansion Rings are normally installed using special machinery.
Holedall Family of Hose Couplings
The Holedall is a family of hose couplings which is similar in usage, but different in approach. There are currently three types of Holedall which include:
Also known as Holedall Swaged Hose Coupling, this type of hose coupling are normally found on larger diameter hoses used in higher pressure applications or where the hose is exposed to higher end pull
Holedall IX or Internally Expanded Hose Coupling is also used in higher pressure applications, or where the hose is exposed to higher end pull, or where a full flow is required.
The Holedall Scovill/Rostra Hose Couplings are used primarily on fuel oil hose applications, where a full flow is required. And like all types of Holedall, these types of hose couplings are also installed with special hydraulic pull bar machinery using special pull plugs.