Types of Quick Couplings

Quick connect couplings are connectors or fittings used to mate fluid lines to equipment that needs to be repeatedly connected and disconnected.

 

HONGLEI are connectors or fittings used to mate fluid lines to equipment that needs to be repeatedly connected and disconnected. They are used in hydraulic and pneumatic applications, designed for easy manual operation, and are primarily used as fitting accessories on mobile machinery.

 

Their design is simple: the male end or plug is inserted into the female end or socket to create a secure, leak-proof seal. They are sometimes called push connections because connecting them requires only a quick push.

 

They usually have one-way sleeves to allow for tool separation when installing clip-on couplings. Bi-directional sleeves allow for one-handed disconnection. In a bi-directional design, twisting and pulling on both ends will disconnect the connection.

 Truflate Brass Quick Coupler LU4-2SF Automotive Type

 

The quick couplings are of various types, such as:

 

Single End Shut Off Coupler

As the name suggests, these couplings shut off only one side of the coupling, mainly the socket side i.e. male part and hence prevent the leakage of the fluid.

 

These couplings are low-pressure couplings used mainly for air, oil and water with a maximum pressure of 20 bars. They also have a similar ball float which snaps shut the flow as soon as they’re disconnected.

 

These are available in variety of sizes, again depending on the application.

 

Single End Shut Off Coupler can further be of many types, such as

Hose End Type

Male Thread Type

Female Thread Type

Double End Shut Off Coupler (Standard Pressure)

 

This type of couplings shut off both (instantaneously), the socket and the plug upon disconnection. They can be of brass, stainless steel or steel with different pressure ranges, sizes and applications of fluid.

 

Double-end shut off couplers are used in standard pressure applications with a maximum working pressure of 100 bars.

 

Normal Working Pressure – 20 bars

Maximum Working Pressure – 100 bars.

Double End Shut Off Coupler (High Pressure)

 Tru-Flate 1/4" NPT Female Brass Coupler Plug LU4-2PF T Automotive

 

They are generally recommended for high-pressure applications of compressed air, hydraulic and water systems. The steel used to make these couplings is special annealed steel for higher strength and reliability. Similarly, both the sockets and plugs are closed by an inner valve when they are disconnected.

 

The high pressure that they can withstand depends upon the size of the main body.

 

Normal Working Pressure – 210 bars

Maximum Working Pressure – 215 bars

Double End Shut Off Coupler (Ultra High Pressure)

 

These are only for high-pressure hydraulic oil applications. They have a ring lock device that provides extra safety against shock and vibration. They have very high reliability against leakage as well.

 

Normal Working Pressure – 700 bars

Maximum Working Pressure – 2500 bars

 

Line Couplers

Line couplers are generally used to connect two or more couplings simultaneously to a single line. They are used in hydraulic couplings of cylinder heads of the main engine and auxiliary engine onboard.

 

QCDC Coupling:

This is another form of quick coupling used for the transfer of cryogenic liquid such as LNG etc. QCDC stands for “quick connect disconnect”.

 

Thus, these types of couplings are efficient, reliable, easy to connect and of great use in modern-day to day operations on-board a ship.