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Types of hydraulic fittings

Types of Hydraulic Fittings
To connect tubes, pipes, hoses, valves, and other elements, almost every hydraulic system needs the use of fittings. Within the hydraulic system, these fittings seal fluid using either all-metal fittings that use metal-to-metal contact or compressed seal O-ring fittings. This way, all tube, valve, and hose fittings operate.

Compression fittings - include all kinds of fittings to connect the vessel to the fitting using compressive force.

Standard compression fittings - use metal gaskets, rings, or ferrules that form a compression seal on the vessel. Typically, compression is done by pressing a nut over the piping and ferrule onto the fitting, compressing and securing the inside vessel. No tools are required to assemble standard compression fittings, making them convenient for fast field facilities.
Bite-type fittings are compressive fittings with a sharp ferrule which, when compressed, "bites" the vessel and provides the seal. Bite-type fittings, such as conventional compressive fittings, do not involve unique assembly instruments but provide a stronger, higher pressure connection.
Flare fittings are made up of a flared or coned ended body. Special flaring tools are utilized for installation of the vessel inside the flare with a deep seal. Flare fittings than standard compression fittings can handle higher pressure and a more extensive range of operating parameters.  
Crimp fittings involve placing the hose on a tubular end and crimping a sleeve, ring or crimp socket against it. Typically, these fittings require crimping instruments or machines to connect.
End fittings provide specific surfaces in pneumatic systems for connecting vessels.  
Clamp Ends are fittings that enable the clamping of hoses or pipes on the portion.
Plain Ends are surface fittings that will allow adhesive, soldering, welding, or other continuous means to connect pipes or tubes.
Push-to-connect fittings have ends built by pressing it to the end to accept tubing. Usually, these fittings disconnect through some a retraction collar. For system segments that require frequent disconnection and reconnection, these connections are convenient.
Threaded fittings on their internal (female) or outer (male) surfaces have screw threads (built-in grooves) intended to accept connections with corresponding threads. Threads are called straight threads that provide an easy connection but no guaranteed seal. Tapered threads are designed to give a tight seal required for pneumatic applications. These precise threads generate a "dry fit," which means they seal without the need for additional sealant, which is essential in an application where added sealant may result in contamination or corrosion.