A compression fitting is a fitting used in plumbing and electrical conduit systems to join two tubes or thin-walled pipes together. In instances where two pipes made of different materials have to be joined (most commonly Pvc material and copper), the fittings will be made of one or maybe more compatible components suitable for the connection. Compression fittings for attaching tubes (piping) commonly have ferrules (or olives in the UK) in them. Installationpartssupply Providing OEM’s and Professional Beverage Installers with Commercial Grade Installation Supplies since 95. Check out our collection of tube compression fitting.

Compression fixtures are used extensively in hydraulic, gasoline, and water techniques to allow the bond of tubes to threaded elements like valves and resources.[1] Compression fixtures are fitted to a number of programs, such as plumbing techniques in confined spaces in which copper pipe could be hard to solder without developing a flame risk, and thoroughly in hydraulic industrial programs. A significant benefit would be that the fixtures permit easy disconnection and reconnection.

In small sizes, the compression fitting is composed of an external compression nut plus an internal compression diamond ring or ferrule (sometimes known as an “olive”) that is certainly typically made of brass or copper or steel. Ferrules vary in good shape and materials but are most frequently inside the form of a diamond ring with beveled sides. To work correctly, the ferrule should be focused correctly, in the case of copper olives they are usually barrel shaped which indicates they should not be installed wrongly, but where this may not be so particularly in Hydraulic and high pressure applications the ferrule is installed such that the longest sloping face of the ferrule faces away from the nut.

If the nut is tightened, the ferrule is compressed between the nut and the receiving fitted; leading to each finishes of barrel shaped copper olives to be clamped around the pipe when the middle of the ferrule bows away from the pipe, with regards to hydraulic design ferrules they now have one finish which is bigger with a 45 degree chamfer which tapers away (from installation contact using the nut) and also the little end generally has two inner biting sides, for applications challenging higher pressure, that penetrate the exterior size in the tube, the fixtures has to be tightened to recommendations as per DIN2353 as not to exceed the stretchy restrict of the metal ferrules, The effect is that the ferrule closes the space in between the pipe, nut, and getting fitted, thereby forming a strict joints. The clamping assistance in the pipe from the force on the taper at each finishes aid the prevention of movement of the pipe within the fitting, yet it is merely the taper at the receiving fitted itself that must seal totally, because if it does seal (to both the pipe and also the compression fitted) then no liquid can reach the nut threads or perhaps the taper in the nut end to bring about any leakages. Consequently some comparable fixtures can be produced utilizing an olive with only one taper (or even a repaired cone sealed to the pipe) in which the closing at that taper stops fluid from getting to the nut.

Larger dimensions of compression fitting do not possess one particular nut to compress the ferrule but a flange having a ring of mounting bolts that performs this. The bolts have to be tightened evenly.

Line sealants including joint compound (pipe dope or line seal off adhesive tape such as PTFE adhesive tape) are unnecessary on compression fitting threads, because it is not the line that seals the joints but alternatively the compression from the ferrule involving the nut and pipe. However, a small amount of plumber’s oil or lighting oil placed on the threads will provide lubrication to assist make sure an effortless, consistent tightening in the compression nut.

It is essential to avoid over-tightening the nut otherwise the reliability of the compression fitted will be affected through the extreme pressure. If the nut is overtightened the ferrule will deform incorrectly resulting in the joints to fail. Certainly, overtightening is regarded as the common reason for leakages in compression fixtures. An excellent guideline would be to tighten up the nut initially manually till it really is too hard to carry on then tighten the nut one half-turn much more using the aid of the wrench; the particular amount varies with the size of the fitting, being a bigger one requires much less tightening up. The fitted will then be tested: if slight weeping is observed, the fitted is steadily tightened up until the weeping stops.

The integrity of the compression fitting is dependent upon the ferrule, which can be effortlessly susceptible to harm. Therefore treatment should be come to when dealing with and tightening the fitted, even though when the ferrule is ruined it really is effortlessly changed.

Varieties of fittings

There are two types of compression fitting, standard (British type-A/non-cunning) and flare fittings (British kind-B/cunning). Regular fixtures need no alterations towards the tubes. Flare fittings require modification from the tubes using a unique tool. Regular fittings are generally utilized for water, hydraulic and compressed air connections, while flare fixtures can be used for gas and stress lines.

A standard fitted can be set up employing an ordinary wrench to tighten the nearby nut. To remove it, a specific puller is often used to slip the nut and ferrule off the pipe. When the ferrule is difficult to eliminate it can be vulnerable having a cut, care becoming taken to not nick the pipe whilst cutting.


Compression fittings are well-known because they do not need soldering, therefore they are comparatively fast and simple to make use of. They might require no unique tools or abilities to function. They work at higher demands along with harmful gases. Compression fixtures are specifically useful in installs that may need periodic disassembly or part removing for maintenance and so on., as these joint parts could be broken and remade without affecting the reliability in the joints.[contradictory] They are also utilized in situations where a heat source, in particular a soldering torch, is prohibited, or where it is sometimes complicated to remove remains of water from in the pipe which stop the pipe warming up to permit soldering.


Compression fittings are not as robust as soldered fittings. They are typically found in programs in which the fitting will not be disrupted rather than subjected to flexing or twisting. A soldered joints is extremely tolerant of flexing and twisting (such as when pipes knock or shake from unexpected pressure changes). Compression fixtures are far much more sensitive to these dynamic pressures. They are also bulkier, and may be considered less great looking than a neatly soldered joints. Compression fittings work dwgtgh when tightened once and not disrupted.[contradictory] Some compression connectors might do not be used again, like a ferrule ring kind. It may never be used again as soon as they have been compressed. This connector is immediately positioned on the pipe as well as the nut is tightened compressing the ferrule in between the pipe and the body from the fitting. Compression of this ferrule also brings about deformation from the copper tubing. If a compression type connection must be redone, generally the compressed copper/ferrule would need to be cut off as well as a new ferrule is going to be utilized on a clear non-compressed piece of pipe finish. This can be to make sure a leak evidence seem link.

3 16 High Pressure Compression Fitting – Commercial Kitchen Beverage & Electronic Bulk Components..

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