Hydraulic Couplers: Everything You Need to Know

Hydraulic couplers are mechanical devices designed for attaching hoses and fittings to one another in high-pressure hydraulic systems. However, they also control and prevent spills and air inclusions. Hoses and other fittings that need to be connected to one another also can prevent spills and inclusions with the help of a coupler. These typically large devices are made from non-ferrous metals like brass and aluminum alloys. In particular, hydraulic couplers are used in higher-pressure oil systems which are very aggressive. They are built to consistently tolerate large amounts of high pressure, hot temperatures, and intense oil degradation. In addition, they have to be fire-resistant because of the extremely flammable oil moving through the network.

Hydraulic couplers are either categorized as quick-release couplers or as conventional screw couplers. First, quick-release couplers are made of a two-part clip with a plug: a male half and a female half. When these two parts are joined correctly, the joint is sealed and locked which helps to manage internalized pressure and to fight against any other force trying to pull it apart. If you disengage its locking mechanism, the parts can be simply released from one another. Quick-acting couplings are especially useful in situations where hoses are connected and disconnected often. They create a fluid tight seal which allows for consistent pressure and equipment can be easily swapped out if needed. Quick coupling is meant for heavy loads and prevents leaks with a self-locking mechanism.

Conventional screw-on couplers also have male and female halves like the quick-release variety, but they will lock by mating an internal thread on the female side to the thread on the male half. Once the outer fittings are tightly screwed on, there is a secure seal present. Oil resistant O-rings and connecting nipples are just two of the many additions to couplers. The coupling at both ends is made of a joint body, check valve core, jacket, steel ball, seal, and spring. Moreover, there exists a check valve in the joint body, and when the two joint bodies are removed from one another, the check valve spool moves underneath the springs and presses up against the tapered hole to close the gap in between. The oil in this pipe is sealed and not able to flow out. With the two joint bodies connected together, the ejector rods come into contact with one another which causes the valve core to leave the joint body’s hole, and finally, the oil from the two separate pipes can interact. These joint bodies are locked using steel balls, and the jacket pushes these steel balls into the joint body’s groove. These hydraulic couplers are easy to put together and take apart, making them useful in oil and gas pipelines.

Hydraulic couplers are safer than mechanical ones due to several features, including red and green LED lights, and a warning buzzer to indicate whether a pairing worked or not. It is known that the majority of accidents happen within five seconds of combining the parts, so many manufacturers have included elements that make it difficult to accidentally drop an attachment. One such feature prevents pins from being incorrectly unlocked by forcing the coupler to connect in two different areas using a wedge lock. There are also safety knuckles which immediately latch onto the first of the two pins to keep the attachment from falling, and some operators may incorporate a feature that puts the safety knuckle back into place automatically. As such, even if the entire hydraulic system fails to work, the knuckles will prevent the pins from releasing, further preventing a dangerous situation from occurring.

Are you in the market for hydraulic couplers or other aircraft parts? At Methodical Purchasing, we offer more than two billion new, used, obsolete, and hard-to-find parts which are sourced from high quality manufacturers worldwide. Once you place an order with us, we work diligently to get your parts delivered to you as quickly as possible. Operating with AS9120B, ISO 9001:2015, and FAA AC00-56B accreditation, many of our products are subject to rigorous quality assurance tests and measures, so let us serve as your trusted parts supplier today! 


November 23, 2022
September 22, 2022

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