A compression fitting is a fitting utilized in plumbing related and electric conduit systems to join two pipes or thin-walled pipes with each other. In instances where two pipes made of dissimilar materials should be joined (most commonly PVC and copper), the fittings is going to be made of one or even more suitable components right for the connection. Compression fixtures for attaching tubing (piping) generally have ferrules (or olives within the UK) in them. Installationpartssupply Providing OEM’s and Professional Beverage Installers with Commercial Grade Installation Supplies since 95. Check out our collection of 3 16 high pressure compression fitting.

Compression fixtures are employed extensively in hydraulic, gas, and water techniques to allow the bond of tubing to threaded components like valves and tools.[1] Compression fittings are suited to many different programs, like plumbing related systems in restricted areas in which copper pipe could be hard to solder without developing a fire risk, and extensively in hydraulic commercial programs. A major benefit is that the fixtures allow simple disconnection and reconnection.

In little sizes, the compression fitted is made up of an outer compression nut plus an internal compression ring or ferrule (sometimes known as an “olive”) that is certainly typically manufactured from brass or copper or metal. Ferrules vary in shape and material but are most frequently within the shape of a diamond ring with beveled edges. To operate correctly, the ferrule must be focused properly, in the case of copper olives they may be normally barrel formed and this means they cannot be installed incorrectly, but where this may not be so specifically in Hydraulic and pressure applications the ferrule is installed such that the longest sloping face of the ferrule faces from the nut.

Once the nut is tightened, the ferrule is compressed in between the nut and the getting fitting; causing each ends of barrel shaped copper olives to become clamped across the pipe when the midst of the ferrule bows away from the pipe, with regards to hydraulic style ferrules they currently have one end which can be larger having a 45 level chamfer which tapers away (from installation contact using the nut) as well as the little end typically has two inner biting edges, for applications demanding much higher pressure, that permeate the surface diameter from the pipe, the fixtures must be tightened to guidelines according to DIN2353 as to not exceed the stretchy restrict from the metal ferrules, The effect is the fact that ferrule closes the room between the pipe, nut, and receiving fitting, therefore forming a tight joints. The clamping assistance of the pipe through the force at the taper at each finishes assist in preventing movement from the pipe within the fitting, yet it is only the taper on the receiving fitted itself that should seal off completely, because if it does seal (to the pipe and the compression fitted) then no liquid can reach the nut threads or even the taper in the nut finish to lead to any leaks. Consequently some comparable fixtures can be produced utilizing an olive with only one taper (or a repaired cone sealed towards the pipe) where sealing at that taper prevents liquid from getting to the nut.

Bigger dimensions of compression fitted do not possess one particular nut to compress the ferrule but a flange with a diamond ring of bolts that executes this. The mounting bolts have to be tightened evenly.

Thread sealants including joints compound (pipe dope or line seal off tape such as PTFE adhesive tape) are unnecessary on compression fitting threads, as it is not the thread that seals the joint but rather the compression of the ferrule between the nut and pipe. However, a tiny amount of plumber’s grease or lighting essential oil applied to the threads will give you lubrication to help make sure a smooth, steady tightening up of the compression nut.

It is crucial in order to avoid more than-tightening the nut otherwise the integrity in the compression fitted will likely be compromised through the excessive force. If the nut is overtightened the ferrule will deform incorrectly resulting in the joint to fall short. Certainly, overtightening is the most typical reason for leaks in compression fittings. A good rule of thumb is always to tighten the nut first yourself until it really is too hard to continue and then tighten the nut one half-turn much more with the aid of the wrench; the specific amount differs with the dimensions of the fitting, being a bigger one demands less tightening. The fitted will be tested: if minor weeping is noticed, the fitted is steadily tightened till the weeping prevents.

The reliability of the compression fitting is determined by the ferrule, which is easily prone to damage. Thus treatment needs to be delivered to when handling and tightening the fitting, even though if the ferrule is ruined it is actually easily replaced.

Types of fixtures

The two main kinds of compression fitted, standard (British type-A/non-cunning) and flare fittings (British type-B/manipulative). Standard fixtures need no alterations to the tubing. Flare fixtures need adjustment in the tubing having a special tool. Standard fittings are typically used for water, hydraulic and compressed air connections, while flare fittings can be used as gas and high pressure lines.

A standard fitting could be installed employing an regular wrench to tighten the surrounding nut. To eliminate it, a specialized puller is frequently utilized to slip the nut and ferrule off of the tube. If the ferrule is difficult to get rid of it can be vulnerable using a cut, care becoming taken to not nick the pipe while reducing.


Compression fittings are popular because they do not require soldering, so that they are relatively simple and fast to make use of. They might require no unique resources or skills to function. They work on greater demands and with toxic fumes. Compression fittings are specifically useful in installs that may require periodic disassembly or part removing for upkeep and so on., because these joints may be damaged and remade without affecting the integrity of the joints.[contradictory] They are also used in circumstances in which a source of heat, in particular a soldering torch, is prohibited, or in which it is not easy to get rid of remains of water from in the pipe which stop the pipe warming up to permit soldering.


Compression fixtures usually are not as robust as soldered fixtures. They may be usually used in programs in which the fitted will not be disrupted and never subjected to flexing or twisting. A soldered joints is highly tolerant of flexing and bending (like when pipes knock or shake from sudden pressure modifications). Compression fixtures are far more sensitive to these kind of dynamic pressures. They are also bulkier, and may be looked at much less aesthetically pleasing when compared to a neatly soldered joints. Compression fixtures function dwgtgh when tightened once and not disrupted.[contradictory] Some compression connectors might do not be used again, for instance a ferrule ring type. It may not be reused once they have been compressed. This connector is directly placed on the pipe and also the nut is tightened compressing the ferrule involving the pipe and the body in the fitted. Compression of this ferrule also leads to deformation in the copper tubes. In case a compression kind connection must be redone, most of the time the compressed copper/ferrule would need to be cut off and a new ferrule is to be used on a clean non-compressed piece of pipe end. This really is to ensure a leak evidence seem link.

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