Hydraulic couplings are generally used to connect a pump to an engine and are made of synthetic rubbers in order to provide a leak-proof seal. These couplings can easily withstand a high temperature and are also quite easy to assemble without the need for lubrication or maintenance. Hydraulic quick connects are couplings or heads that are usually found on the ends of hydraulic hose lines. Such couplings are typically used for charging pressurized systems such as the coolant portion of a refrigerator or the airplane fuel tanks. They are designed in a way that allow high pressure fluid to flow from a container to the other and once the connection between the couplings is broken, it shuts off the flow instantly. Some of the common categories into which quick connects can be divided are:
Drybreak couplings - these couplings are usually male or female ended, with a spring mounted valve that is which is set into the head of each coupling that keeps them closed. During their fitting, the male coupling is plugged into the female coupling and then turned at an angle of ninety degrees on a set of locking grooves. This process helps in locking the two ends of the hydraulic quick connects in a proper place and disengages the springs that holds the valve ends.
Poppet couplings - these couplings are designed a bit differently from any other type of coupling. The male end has a needle-like protuberance that pushes through a rubber diaphragm which is set into the female end. When the male end is inserted, a ring which is placed beneath the milled collar holds it in place with an audible click. Once the male end is pierced in the female end, hydraulic fluid then flows unimpeded in a single direction.
Hydraulic systems generally use water to transfer a force within the system as liquid tends to act as natural lubricant which prevents the metal parts to rub together. However, there are certain disadvantages such as leaks, which cause loss of hydraulic fluids and can ruin the hydraulic system. There are various hydraulic fittings that help to ensure that these systems do not lose necessary fluids. Hydraulic fittings come in different types of designs. Some of the rings are simple O-rings that fit on to the ends of two different lines. Other fittings that are available has multiple openings such that three or more lines can be easily connected at a single point.