Pipes

The coupling is compression: a simple and reliable option for connecting pipes

January 29, 2020

Compression couplings are a type of fitting, which perform the function of rapid joining of pipes with equal diameter. This connecting element is used in water supply systems (drinking and technical), watering, sewer structures, etc.. D. These fittings are made of different materials and can be used to connect all types of pipes.

Compression couplings are simple and reliable fittings for the installation of various types of pipes

Advantages of using compression fittings

Each design has its advantages. Compression products for joining pipes are very reliable and have such positive qualities:

  • connection, obtained with this type of fittings, does not require inspections and periodic inspections;
  • such a joint has excellent tightness. If necessary, it can be installed in concrete;
  • has good resistance to pressure in piping systems;
  • has resistance to corrosion;
  • compression product is environmentally friendly and can be safely used in drinking pipelines;
  • has a huge range of varieties, and this makes it possible to combine pipes of different materials or with different diameters;
  • easy to install. Installation can be done very quickly and without the use of any special equipment.
  • long service life (to 20 years).

features of application

Couplings are very common elements, which are part of various designs. This detail is presented ??numerous options and types and is applied in the most various designs - from pipelines to conditioners (the compressor coupling is an electromagnetic type of fitting). Let's take a closer look at the product, used in piping systems.

The tightness of the connection with a compression coupling is ensured by a thread, on which the nut is tightly screwed

Previously, the most popular among the people were threaded fittings, since they possessed good qualities. The main advantage of threaded connections was that, that such structures were considered detachable. However, threaded fittings had a number of disadvantages: low tightness, weak vibration resistance, complexity of installation. To tighten the thread had to rotate along its axis fitting or workpiece.

The compression coupling is an improved version of this fitting. Its design includes more details. Joining of pipes by means of this device turns out more reliable and possesses the increased tightness. The service life of such a connection is higher, than in threaded structures. exept this, installation of such coupling is carried out easier and faster. This device is used in various fields, but is most popular when installing water supply and heating pipelines in private homes and apartments.

These products are made of different materials: brass, steel, cast iron. However, the most common option is plastic couplings made of low pressure polyethylene (PND) or other types of this polymer. Plastic couplings have high technical characteristics and are resistant to the harmful effects of corrosion. Also have a relatively low cost compared to metal counterparts.

Structure of compression couplings

As mentioned above, HDPE products differ from threaded couplings in a large number of components. Some parts of this connector are made of metal. exept this, these fittings are equipped with rubber gaskets, but the main elements are plastic.

The compression coupling consists of several parts, put them on the pipe in the prescribed manner

The main design elements of compression couplings:

  • thirst;
  • sealing rings;
  • persistent rings;
  • limiters;
  • nuts.

The collet is a small piece of metal or plastic and has a thread on two sides.

Seals are put on the pipes. They are needed to improve the tightness of the structure. Thanks to seals and a limiter all elements of a fitting are reliably fixed in the place. When tightening the outer nuts on the sealing rings, the tightening force acts, which allows you to create a dense, tight connection.

Outer nuts are used for this, to tighten and thus fix the entire structure. Nuts are mounted on the collet thread. They clamp persistent and sealing parts.

Properly installed, you get a technically reliable connection. It does not weaken over time and does not require periodic inspections. exept this, ease of installation of compression parts, is one of the determining factors, which buyers pay attention to when choosing it.

Compression couplings can be used to install drinking water

Types of compression couplings

First of all, all compression couplings are divided by design features:

  • collet;
  • threaded.

Clutch, equipped with collet clamps, has a number of qualities:

  1. No pre-disassembly is required before installation.
  2. A part with a collet element can be mounted on cross-linked polyethylene pipes.
  3. Indicators of working pressure and durability make up 16 there is.
  4. Ideal for drinking and technical piping systems.

The main characteristics of compression parts with collet clamps are presented in table №1.

Table 1

Diameter, mm mass, kg Length, mm
110 2,27 354
90 1,72 314
75 1,41 290
63 0,57 214
50 0,33 195
40 0,26 178
32 0,15 126
25 0,1 122
20 0,078 122
16 0,075 117

Threaded couplings are divided according to the location of the thread on:

  • details with an external carving;
  • details with an internal carving.

Couplings differ in the location of the thread - it is internal and external

The coupling is compression with an external carving

Product, equipped with external thread, used in drinking and technical pipeline structures, as well as in irrigation systems. The location of the thread on the outside allows you to easily connect the pipes. The material of this coupling has high quality indicators, which allows them to be used in systems with operating pressure up to 16 there is. Service life of a compression fitting with an external carving - to 20 years.

The characteristics of compression parts with external threads are presented in table №2.

Table 2

Diameter, mm mass, kg Length, mm
110 1,30 226
90 0,96 — 1,03 203 — 205
75 0,77 — 0,78 173 — 178
63 0,31 — 0,57 128 — 160
50 0,160 — 0,165 109
40 0,138 — 0,139 104 — 105
32 0,066 — 0,085 81 — 83
25 0,050 — 0,064 80 — 81
20 0,035 — 0,037 75 — 76
26 0,039 — 0,040 71 — 73

Compression coupling with female thread

Used to install pipe connections, having fittings with an external carving. exept this, this product can be used for joints with ball valves and various adapters in water supply and heating systems.

Due to the location of the thread, such a part can be used to connect plastic pipes with metal taps, latches and other shut-off valves. The working pressure for such products reaches 16 there is. The price for this type of fitting is relatively small, and performance is quite high. Service life under normal conditions is up to 20 years.

Externally threaded couplings can be used to join pipes of different materials

The characteristics of compression parts with internal thread are summarized in table №3.

Table 3

Diameter, mm mass, kg Length, mm
110 1,55 — 1,84 222
90 1,05 — 1,35 202
75 0,79 — 0,84 169 — 174
63 0,33 — 0,37 127
50 0,17 — 0,22 111
40 0,14 — 0,15 105
32 0,09 — 0,1 92 — 94
25 0,05 — 0,07 87
20 0,045 77
16 0,046 — 0,052 77

exept this, all couplings are divided by type of action on:

  • connectors;
  • transitional.

Connecting compression products are used in pipe joining, which have the same cross-sectional dimensions. Usually, these parts are mounted on straight sections of the pipeline. Transitional devices are used in the case, if it is necessary to make a joint of two pipes with different diameters. Using this type of fitting, it is possible to make also transition from a plastic pipe to metal.
stages of installation

Couplings have different diameters, but the most common is diameter 110 mm.

Installation of a part of this size is performed taking into account a number of rules:

  1. Pipes should be prepared before installation. The edges of the pipe are cleaned of rust, paints, be sure to remove the burrs. The necessary marking is applied to the pipes. For, to mark the pipes, you can use a regular marker.
  2. At the edge of the joined pipes are nuts, persistent elements and seals. The sequence of elements should be strictly adhered to. The nuts are tightened last, so, they need to be put on the pipes first. Then come the persistent rings and ??seals.
  3. The resulting structure should be fixed, to get a tight knot. If manual effort is not enough, it is permissible to use a wrench of appropriate diameter.

All installation at correct performance of work occupies no more 5 minutes. Such a connection is considered detachable, therefore, if necessary, you can easily dismantle the structure. All you need to do is loosen one of the outer nuts of the coupling and remove the pipe from the fitting.