Hose couplings are simply connectors found on hose ends. Their main function is connecting or coupling one hose with another hose, tap or hose appliance such as a sprinkler. Hose couplings are usually made of brass, aluminum, stainless steel or plastic.
Types of hose couplings
There are very many types of hose couplings. Below are some of the most common types
1. Air King hose couplings: These hose couplings are the universal type. The couplings are usually made of brass and found on common pneumatic tools such as jackhammers. Air King hose couplings are considered universal because they have a common head that is usable for all size ranges i.e. from 1/4″ to 1″.
2. Express coupling: This type of hose couplings are symmetrical half couplings for air and water use. One of the most popular express coupling type is the standard NF E 29-573. These couplings are popular in the European market with stainless steel and brass materials.
3. Cam and groove hose couplings: As the name suggests, these hose couplings are quick to connect. They are mainly used for fluid transfer. Cam and groove hose couplings connect adapter and female couplers respectively. Adapters have groves on the outside which engage cam arms outside the coupler to seal against the coupler inside. These types of hose couplings (cam and groove) are common in petroleum and chemical applications.
4. Ground joint hose couplings: These hose couplings are usually used for steam or compressed air applications. A ground joint hose coupling is composed of a spud, wing nut and stem. The hose couplings seal as soft copper seats located inside the spuds drawn against the stems when wing nuts are tightened.
5. Hoselink hose couplings: These hose couplings are bayonet type connectors which use 0 ring compression for providing watertight connections for commercial and home garden hoses.
6. Hozelock hose couplings: These hose couplings are made of plastic by the popular hose coupling company called Hozelock Ltd. The hose couplings have a push-fit click-on style end connector common in many garden hoses. Plastic hose couplings were invented with the main aim of replacing metal hose connectors prone to static sparks which caused gas explosions. Hozelock hose couplings solve this problem ensuring safe applications.
7. Storz hose couplings: Storz couplings are ¼ turn couplings or simply sexless couplings. They are usually used to connect fire hydrants, male/female end, easy to connect lugs which are inside couplings. Storz hose couplings are the standard couplings in countries such as Germany, Denmark, Austria, Sweden, Netherlands and Switzerland. In industrial applications, Storz hose couplings are used for fire fighting.
8. Guillemin symmetrical clutch hose couplings: Also known as Guillemin couplings, Guillemin symmetrical clutch hose couplings are commonly used in countries such as Belgium and France to couple hoses. The couplings resemble DSP couplings used in fire fighting.
One notable characteristic of Guillemin couplings is that they can be fastened using a tricoise wrench or by hand. The couplings also have a ¼ quarter turn closing. They can be found in 4 main materials namely; brass, stainless steel, aluminium and polypropylene. Guillemin couplings are EN14420-8/NF E 29-572 standard. The special standard is DIN14420-8.