Connecting elements can be classified according to a number of criteria:

1. Purpose of application

• connection of pipes with equal diameter;
• joining pipes with different diameters;
• creation of branches of pipelines;
• pipe bending device;
• for installation in single system pipes with various fittings;

2. Mounting method:

• compression;
• welded;
• electrowelded;

3. Hardness:

• rigid - exclude any possibility of moving pipes;
• flexible - slight longitudinal movement of pipes and rotation at a small angle are allowed. In this case, all created connections are not broken and remain unchanged;

4. Detachability:

• detachable - allow you to create strong and tight connections, which can be disassembled if necessary, for example, for repair, reconstruction and change of the route of the pipeline;
• one-piece - as a rule, they are used when creating pipe connections that are underground, in concrete, etc. This type of connection is the most reliable, but does not allow disassembling the system into separate components.

Where to buy fittings at an affordable cost

Our catalog offers big choice connecting elements for HDPE pipes. Here you will find compression, molded, electrofusion fittings. We supply products directly from the manufacturer, this allows us to form attractive prices no extra charges or overpayments.

Pickup points in the cities of Moscow, Klimovsk and Novomoskovsk will allow you to pick up the goods at convenient location. You can also order delivery in Moscow and the Moscow region.

Polyethylene low pressure(HDPE) is a solid polymer material obtained by polymerization of ethylene. HDPE has the following physical and chemical properties:

• water resistance;
• plastic;
• strength;
• lightness;
• acid-base, corrosion, temperature resistance;
• good heat and sound insulation.

The above properties determine the popularity of the use of low-density polyethylene in various industries. Primary processing of HDPE is carried out in four available ways:

1. Extrusion - forcing molten material through an extruder. Allows you to receive food and garbage bags, conveyor nets, construction tapes, sheets, pipes, etc.
2. Injection molding - injection of HDPE melt into a mold, followed by cooling. The products of the technology are compression fittings for HDPE pipes, furniture fittings, plastic crates, kitchen attributes, etc.;
3. Blowing - injection of polymer into the cavity in the form internal form the required product. This technology makes it possible to obtain canisters, tanks, barrels, tanks, etc.
4. Rotoforming - loading of a polymer in powder / liquid form into a hollow rotating mold with gradual melting and cooling in it. It is used in the production of mannequins, traffic cones, parts for children's playgrounds, etc.

HDPE pipes and fittings

properties and available market price HDPE determined the benefits of making plumbing and gas pipes. Installation of pipes made of low-pressure polyethylene (diameter from 10 to 1600 mm) is carried out in three available ways:

1. Flare - used for non-pressure systems (heating, sewerage) if there are socket rings on the pipes;
2. Compression - used in low-pressure systems (water supply, irrigation) by screwing a compression fitting of a compression fitting onto a pipe;
3. Electrowelded - suitable for high-pressure systems (drains, gas pipelines), during installation, fittings for HDPE pipes and a welding machine are used.

The preferred method of connecting HDPE pipes is compression. It differs:

• ease of assembly / disassembly;
• universality (suitable for pipelines of all types);
• high rates quality, safety and hygiene.

As noted above, compression installation of pipes is impossible without the presence of special connecting parts - fittings. Depending on the nature of the connection compression HDPE fittings may be of the following types:

• square, branch;
• clutch;
• flange;
• tee, cross;
• plug;
• ball valve.

All of the above types of compression fittings have a similar design - a polyethylene body with an external thread and a retainer, a sealing and a ferrule, a sleeve, a cap nut.

HDPE pipes and compression fittings in Moscow

Buy HDPE pipes and fittings for hot and cold water supply, heating, sewerage systems in Moscow at favorable price You can in the online store "Terem". The company catalog contains a wide range of products of the European (REHAU, TIEMME, STP) and Russian (CYKLON, RUVINIL, Gilex) manufacturer with detailed description specifications, advantages, areas of application of the product, etc. All products of the online store comply with the ISO 9001 quality standard, have the characteristic of reliable and durable.

"Terem" - reliability, quality, stability.

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Connecting fittings for low pressure polyethylene pipes

HDPE ( polyethylene pipes low pressure) are among the most modern and popular products for pipeline construction for various purposes. In turn, each of them has an inlet and outlet, and almost everyone has different shut-off valves and branches, respectively, for this, fittings for HDPE pipes are also needed.

Types of polyethylene pipes depending on the purpose.

There are a large number of them for HDPE pipes, which can be divided according to the principle of docking with the product. How to understand this diversity and how to choose one or another stop valve?

All types of HDPE pipe connections are divided into:

• by rigidity: rigid and non-rigid (elastic) connection;
• by detachability: detachable and one-piece connection;
• connection method.

During installation, fittings for HDPE pipes, including valves, can be connected to the pipeline in various ways.

Permanent connection

Welding is the main type of connection. Exist various ways product welding. Some of these methods are more common, some are less common.

Scheme of butt welding.

Welding methods:

1. Butt welding is the most common method, when the end of the product and fitting is melted with a special apparatus and they are pressed together, as a result of the melt, a monolithic seam is formed, which is similar in its properties to the pipe material. For this method, fittings and HDPE pipes must have the same diameter. Butt welding is very often used in the construction internal networks water supply and heat supply, while using "hand irons". If in the welding machine the products are fixed with particular accuracy relative to the docking point, then when performing work manually, it is necessary to pay Special attention relative position products, and best of all - before the seam hardens, fix them with any devices.
2. Nest welding - has the same principle, except that this method uses fittings for HDPE pipes with an inner diameter that is equal to the outer diameter of the product. If in the first method (butt welding) the soldering iron is made in the form of a disk, then in socket welding one side of the soldering iron is flat and equal to the diameter of the pipe, the other side has the form of a rod, the diameter of which is equal to the inner diameter of the fitting.
3. Edge (pressing) welding - is used mainly for welding the product with the entrances of wells, etc., where it is necessary to weld the pipe to a plane that is larger than its diameter. For this, special PE electrodes are used. This method is used only in a non-pressure system that does not require absolute tightness.
4. Electrofusion welding - the welding process consists in melting polyethylene, while fittings and HDPE pipes must also have the same diameter. However this method requires the use of special coupling. The coupling has a heating grid fused during production and two contacts. Each such coupling has a bar code. If an automatic welding machine is used, it will automatically read the data and set optimal parameters welding. Otherwise, these parameters must be set manually.

Scheme of electrofusion welding.

plug connection

Based on the fact that all welded fittings are non-detachable connections, they do not install shutoff valves and control devices. Since in the event of failure of these devices, with a permanent connection, their replacement requires considerable effort.

The next connection type is . They are used, as a rule, on external networks and the principle of their operation is the same. The compression fitting has a ring (split) and a tightening nut.

Flange connection - used, as a rule, for with large diameter, in places where shut-off and other valves are installed.

Nut, then we put the ring on the product, after which we tighten the nut. After it is tightened, this connection guarantees the impossibility of slipping of the ends of the product under tensile influences. In today's market, manufacturers offer both brass and compression type. As a rule, they are used when there is a threat of shock loads on this connection.

Based on the manufacturers' data, compression fittings are designed for working medium pressures up to 20 atmospheres, that is, they are suitable for use in pressure networks.

Flange connection - is used, as a rule, for joining pipes with a large diameter, in places where shut-off and other valves are installed, or when connecting a pipeline made of polyethylene with metal areas. At the same time, in polyethylene networks, cast HDPE flanges are usually used, and if it is necessary to switch to metal, brass fittings equipped with a plastic outlet, which is designed for welded joint with a polymer product.

Threaded connection - used external, which is cast on one of the ends of the pipe, and internal - on the other connection pipe or fitting. This connection is considered by experts not to be particularly reliable. Based on this, it is used for the installation of non-pressure liquid transportation systems or in the laying of cable communications.

Socket connection - based on fixing the end with a standard diameter of one product, inside the expansion at the end of another product or fitting. As a rule, this connection is used when installing a non-pressure drainage system (sewerage) or when laying a cable.

Types of fittings

For laying pipelines from, fittings are used in the following cases(by material and type):

Varieties of fittings for detachable connections of HDPE pipes

1. Equal bore coupling - made with the same diameter at both ends. It is used for joining individual pieces of pipe or with other elements with the same diameter size as the pipe.
2. Expansion sleeve - used to change the diameter of the pipeline or install an element with a larger / smaller size
3. Thread-plastic connection. When joining, for example, a polymer and metal fittings, a combined fitting is performed. An embedded element with an external or internal thread is mounted in a plastic sleeve, it is usually made of brass.
4. Flanges - used for mounting removable fittings or docking with pipes made of other materials. There are combined and PE. Flange couplings are their variety.
5. Branches. Of course, polyethylene is quite flexible material, but still it should not be allowed to bend too sharply. The use of bends allows the pipeline to significantly change direction. Bends are available as standard for 45°, 66° and 90° bends.
6. Crosses and tees - with the use of such fittings, the pipeline can be docked with necessary quantity other parts of the network. Branches can be both with the same and different diameters.
7. Plugs. This type of fitting allows you to perform the conservation of "deaf" HDPE pipes. Such a situation can be, for example, if it is necessary to decommission a certain section of the water supply, or they can be used in places where a new connection will be organized later, etc.

In general, the fittings for it allow you to create a combination that will make it possible to build a pipeline for any task and in any conditions. Along with a relatively low price and high operational properties HDPE products, it provides polymer material well-deserved high popularity, both among private consumers and installation organizations.

Fittings for LDPE pipes are indispensable element in professional works associated with the pipeline for heating or water supply. They are the transition to a threaded connection. Fittings are quite versatile and work well when using polyethylene, steel or other pipe. Choosing quality product, you guarantee the protection of the pipeline from leaks, as well as other similar problems. The company offers products of such brands: ITAP, Tiemme, Unidelta.

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Tee crimp TIEMME 40 - necessary element used to connect polyethylene and PEX pipes of the same diameter during the installation of cold and hot water supply systems, heating in residential, administrative, industrial buildings, when laying technological pipelines, pneumatic pipelines transporting substances to which polypropylene is chemically resistant. Type of connection of a tee - compression. The material of the TIEMME 40 crimp tee is CW617N brass (zinc washout resistant). Operating conditions of the tee crimp TIEMME 40: operating pressure up to 30 bar, maximum working temperature+110 degrees Celsius, working environment - non-corrosive liquids such as hot and cold water, oils, compressed air etc. Compression connection does not require any additional devices for mounting, except for the wrench.

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Discount price: RUB 1,973.07

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Tee crimp-N TIEMME 25x3 / 4 "x25 - a necessary element used in the transition from the crimp part to threaded connection polyethylene and PEX pipes when installing cold and hot water supply systems, heating in residential, administrative, industrial buildings, when laying technological pipelines, pneumatic pipelines transporting substances to which polypropylene is chemically resistant. Connection type of the tee crimp-N TIEMME 25x3/4"x25 - crimp and external thread. Material of the tee crimp-N TIEMME 25x3/4"x25 - brass CW617N (resistant to zinc washout). Operating conditions of the crimp-N TIEMME 25x3 / 4 "x25 tee: operating pressure up to 30 bar, maximum operating temperature +110 degrees Celsius, working environment - non-aggressive liquids such as hot and cold water, oils, compressed air, etc.

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Discount price: RUB 459.00

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Tee crimp-N TIEMME 40x1"1/4x40

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Tee crimp-N TIEMME 40x1 "1 / 4x40 - a necessary element used in the transition from the crimp to the threaded connection of polyethylene and PEX pipes during the installation of cold and hot water supply systems, heating in residential, administrative, industrial buildings, when laying technological pipelines, pneumatic pipelines transporting substances to which polypropylene is chemically resistant Tee connection type crimp-N TIEMME 40x1 "1 / 4x40 - crimp and external thread. The material of the crimp-N tee TIEMME 40x1 "1 / 4x40 is CW617N brass (resistant to zinc washout). The operating conditions of the crimp-N TIEMME 40x1" 1 / 4x40 tee: working pressure up to 30 bar, maximum working temperature +110 degrees Celsius, working medium - non-aggressive liquids such as hot and cold water, oils, compressed air, etc.

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Tee crimp-N TIEMME 50x1"1/2x50

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Tee crimp-N TIEMME 50x1 "1 / 2x50 - a necessary element used in the transition from the crimp to the threaded connection of polyethylene and PEX pipes during the installation of cold and hot water supply systems, heating in residential, administrative, industrial buildings, when laying technological pipelines, pneumatic pipelines transporting substances to which polypropylene is chemically resistant Tee connection type crimp-N TIEMME 50x1 "1 / 2x50 - crimp and external thread. The material of the crimp-N tee TIEMME 50x1 "1/2x50 is CW617N brass (resistant to zinc washout). Operating conditions of the crimp-N TIEMME 50x1" 1/2x50 tee: working pressure up to 30 bar, maximum working temperature +110 degrees Celsius, working medium - non-aggressive liquids such as hot and cold water, oils, compressed air, etc.

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Tee crimp-N TIEMME 63x2 "x63 - a necessary element used in the transition from the crimp to the threaded connection of polyethylene and PEX pipes during the installation of cold and hot water supply systems, heating in residential, administrative, industrial buildings, when laying technological pipelines, pneumatic pipelines, transporting substances to which polypropylene is chemically resistant. Tee connection type crimp-H TIEMME 63x2 "x63- crimp and external thread. The material of the crimp-N tee TIEMME 63x2 "x63 is CW617N brass (resistant to zinc washout). Operating conditions of the crimp-N TIEMME 63x2"x63 tee: operating pressure up to 30 bar, maximum operating temperature +110 degrees Celsius, working medium - non-aggressive liquids such as hot and cold water, oils, compressed air, etc.

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Tee crimp-B TIEMME 25x3 / 4 "x25 - a necessary element used in the transition from the crimp to the threaded connection of polyethylene and PEX pipes during the installation of cold and hot water supply systems, heating in residential, administrative, industrial buildings, when laying technological pipelines, pneumatic pipelines transporting substances to which polypropylene is chemically resistant. Tee connection type crimp-B TIEMME 25x3 / 4 "x25 - crimp and internal thread. The material of the crimp-B tee TIEMME 25x3 / 4 "x25 is CW617N brass (resistant to zinc washout). Operating conditions of the crimp-B TIEMME 25x3 / 4" x25 tee: working pressure up to 30 bar, maximum working temperature +110 degrees Celsius, working medium - non-aggressive liquids such as hot and cold water, oils, compressed air, etc.

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Tee crimp-B TIEMME 63x2 "x63 - a necessary element used in the transition from the crimp to the threaded connection of polyethylene and PEX pipes during the installation of cold and hot water supply systems, heating in residential, administrative, industrial buildings, when laying technological pipelines, pneumatic pipelines, transporting substances to which polypropylene is chemically resistant. Tee connection type crimp-B TIEMME 63x2 "x63- crimp and internal thread. The material of the crimp-B tee TIEMME 63x2 "x63 is CW617N brass (resistant to zinc washout). Operating conditions of the crimp-B TIEMME 63x2"x63 tee: operating pressure up to 30 bar, maximum operating temperature +110 degrees Celsius, working medium - non-aggressive liquids such as hot and cold water, oils, compressed air, etc.

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TIEMME 63 elongated crimp coupling is a necessary element used for connecting polyethylene and PEX pipes of the same diameter when installing cold and hot water supply systems, heating in residential, administrative, industrial buildings, when laying technological pipelines, pneumatic pipelines, transporting substances to which polypropylene is chemically resistant . Coupling connection type - crimp.

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Currently, when laying communication lines for various purposes, low-pressure polyethylene pipes (HDPE) are often used. Their installation is carried out using special fittings, which include Ball Valves. Next, we will consider what these products are, what they are and what their features are.

polyethylene ball valve 25 - 25 mm

Features of HDPE ball valves

Plastic ball valves for HDPE pipes are shut-off valves, which are designed to completely shut off the flow of liquid transported through the pipeline. They are called ball because the locking mechanism is made in the form of a ball with a through hole.

The ball can rotate 90 degrees in the body, which allows you to open or block the passage. The position of the locking mechanism is controlled by a lever. In taps large diameter(150 mm and more) the locking mechanism is controlled by an electric drive, pneumatic or hydraulic drive.

The body of these devices is made of HDPE, i.e. the same material as the pipeline itself. The locking mechanism is most often made from polypropylene or another type of plastic.

Advantages

The shut-off valve under consideration has many positive qualities, among which are:

• Durability - the product can last 25 years or more. Durability largely depends on the operating conditions of the product.
• Reliability, which is associated with simplicity of design.
• Low price due to cheap materials.
• Low weight products.
• High degree of tightness.
• Due to the fact that the device is made of plastic, it is not subject to corrosion, and besides, sediment practically does not settle on it.

Flaws

For objectivity, here are some of the shortcomings of the devices in question:

• Cannot be used to regulate the flow, as in this case they quickly fail.
• Like other HDPE fittings, they are designed for less pressure than metal fittings.
• As the temperature rises, the strength of the device decreases.

Note!
Before using a plastic ball valve for HDPE pipes, you must make sure that its characteristics correspond to the conditions in which it will be operated.

Types of valves for HDPE

In addition to the fact that the devices in question differ in diameter, they can also be designed for different ways mounting:

• Collet (compression);
• Flanged;
• Welded.

Below we will take a closer look at the features of each type of device.

collet

These devices are used for pipelines of small diameter - 20 mm - 110 mm. Their main feature is the ease of installation, which can be done by hand without the use of special equipment, and without the skills of such work.

Note!
For quality installation crane in a collet way, it is necessary to strictly perpendicular to their axis and chamfer a few millimeters, as shown in the diagram above.

As a rule, this shutoff valve is used in domestic water pipes. Below are the main characteristics of these devices:

Depending on the device model, the specifications may vary slightly. However, in general, they correspond to the data from the table.

It must be said that compression cocks may have like same sizes inlet and outlet pipe, for example, 32 - 32 mm, and different, i.e. can serve as adapters between pipes of different diameters.

In the photo - a flanged polyethylene valve

Flanged

Flanged ball HDPE valves are used for large diameter pipelines (up to 315 mm). They are connected to the pipeline by bolting using flanges. As a collet, this connection is collapsible.

Unlike devices of the previous type, flanged valves are able to withstand more pressure. Often these valves are used in the chemical industry, as they are resistant to acids and alkalis, and are not subject to corrosion.

Welded

This method of connection is used in cases where it is necessary to ensure tightness. Installation instructions in this case are more complicated.

Welding can be done in two ways:

• butt- with the help of a special welding machine, which melts the ends of the two parts to be welded. Subsequently, the parts are joined under pressure.
• Electrofusion method- the heating of the surfaces of the parts to be joined in this case is carried out with the help of shaped parts through which a metal spiral passes. As a result, the parts to be joined and the electrical coupling are welded together, providing a reliable connection.

Here, perhaps, are all types of polyethylene ball valves.

Conclusion

Polyethylene ball valves are reliable shutoff valves applied to various kinds pipelines from HDPE pipes. As we found out, depending on the purpose of the line and its diameter, they can be mounted in different ways.

From the video in this article, you can get some additional information on this topic.