Fittings for polyethylene pipes low pressure are an indispensable element in professional work related to the installation of pipelines for heating or water supply. They are a transition to a threaded connection. The fittings are quite versatile and work well when using polyethylene, steel or other pipes. Choosing quality product, you guarantee the protection of the pipeline from leaks, as well as other similar problems. The company offers products of the following brands: ITAP, Tiemme, Unidelta.

In stock

Tee crimp TIEMME 40 - necessary element, used for connecting polyethylene and PEX pipes of the same diameter when installing cold and hot water supply and heating systems in residential, administrative, industrial buildings, when laying process pipelines, pneumatic pipelines transporting substances to which polypropylene is chemically resistant. The tee connection type is crimp. The material of the TIEMME 40 crimp tee is brass CW617N (resistant to zinc leaching). Operating conditions for the TIEMME 40 crimp 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 and so on. The compression connection does not require any additional devices for installation other than a wrench.

Add item to cart

Discounted price: RUB 1,973.07

In stock

Shipment rate: 1 pc.

Number of units:

1 +1

Amount: RUB 1,973.07

In stock

Tee crimp-H TIEMME 25x3/4"x25 - a necessary element used in the transition from the crimp part to threaded connection polyethylene and PEX pipes during the installation of cold and hot water supply and heating systems in residential, administrative, and industrial buildings, when laying process pipelines, pneumatic pipelines transporting substances to which polypropylene is chemically resistant. Connection type of crimp-H tee TIEMME 25x3/4"x25 - crimp and external thread. Material of crimp-H tee TIEMME 25x3/4"x25 - brass CW617N (resistant to zinc leaching). Operating conditions for the crimp-H tee TIEMME 25x3/4"x25: 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.

Add item to cart

Discounted price: RUR 459.00

In stock

Shipment rate: 1 pc.

Number of units:

1 +1

Amount: 459.00 RUR

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

In stock

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

Add item to cart

Discounted price: RUB 1,737.89

In stock

Shipment rate: 1 pc.

Number of units:

1 +1

Amount: RUB 1,737.89

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

In stock

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

Add item to cart

Discounted price: RUB 1,699.00

In stock

Shipment rate: 1 pc.

Number of units:

1 +1

Amount: RUB 1,699.00

In stock

Crimping tee-H TIEMME 63x2"x63 is a necessary element used in the transition from the crimping part to the threaded connection of polyethylene and PEX pipes during the installation of cold and hot water supply and heating systems in residential, administrative, and industrial buildings, when laying process pipelines, pneumatic pipelines, transporting substances to which polypropylene is chemically resistant. Connection type of tee crimp-H TIEMME 63x2"x63 - crimp and external thread. Material of crimp-H tee TIEMME 63x2"x63 - brass CW617N (resistant to zinc leaching). Operating conditions of crimp-H tee TIEMME 63x2"x63: 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.

Add item to cart

In stock

Shipment rate: 1 pc.

Number of units:

1 +1

Amount: RUB 2,699.00

In stock

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

Add item to cart

Discounted price: RUB 385.00

In stock

Shipment rate: 1 pc.

Number of units:

1 +1

Amount: RUB 385.00

In stock

Crimp-B tee TIEMME 63x2"x63 is a necessary element used in the transition from the crimp part to the threaded connection of polyethylene and PEX pipes during the installation of cold and hot water supply and heating systems in residential, administrative, and industrial buildings, when laying process pipelines, pneumatic pipelines, transporting substances to which polypropylene is chemically resistant. Type of tee connection crimp-B TIEMME 63x2"x63 - crimp and internal thread. Material of crimp-B tee TIEMME 63x2"x63 - brass CW617N (resistant to zinc leaching). Operating conditions of crimp-B tee TIEMME 63x2"x63: 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.

Add item to cart

Discounted price: RUB 2,699.00

In stock

Shipment rate: 1 pc.

Number of units:

1 +1

Amount: RUB 2,699.00

In stock

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

Add item to cart

Discounted price: RUB 1,995.26

In stock

Shipment rate: 1 pc.

Number of units:

1 +1

Amount: RUB 1,995.26

Polyethylene compression fittings are compression-type compression fittings for the installation of polyethylene pipes of PE 80 and PE 100 grades. Compression fittings for are produced by casting from polypropylene copolymer. Polyethylene compression fittings are made with internal and external threads various forms: compression couplings, compression tees, compression bends and saddle compression bends, compression plugs and flanged compression connections.

HDPE compression fittings are produced with a diameter from 16 mm to 110 mm and with a working pressure from 10 to 16 atmospheres (Bar): for a diameter from 16 to 63 mm up to 16 Bar, for a diameter from 75 to 110 mm up to 12.5 Bar. HDPE compression fittings are connected to PE pipes using a fitting ferrule, which is pressed onto the pipe. A compression fitting for polyethylene pipes is a collapsible structure that consists of modular components.

Areas of use

HDPE compression fittings are intended for connection and installation of polyethylene pipes of PE80 and PE100 brands in places of change of direction: turns and branches, in places of change in pipeline diameter, in places of connection with pipeline fittings, as well as for the transition from polyethylene pipes to pipes made of other materials. Compression fittings are used for the installation and repair of pipes of the PE80 and PE100 brands, which are used in drinking and technical cold water supply systems (pipelines transporting drinking and food water, process water in irrigation systems, etc.), as sealed cable ducts. Also, these fittings can be used in any pipelines with a working medium, in relation to which the chemical resistance of the compression fittings themselves is ensured. Polyethylene compression fittings are widely used in automatic irrigation systems.

The use of compression fittings made of low-density polyethylene ensures complete tightness between the mounted parts. Installation of HDPE compression fittings of small diameters is carried out manually without the use of special tools; installation of large diameters is carried out using a special compression wrench. Compression fittings for PE polyethylene pipes can be used for any weather conditions And negative temperatures. Compression bags should be stored indoors, protected from direct sunlight.

Installation of HDPE compression fittings

A compression fitting for polyethylene pipes consists of five elements:

1 -The cap nut is made of polypropylene copolymer, designed for fixing and crimping, has an internal thread and external grooves for convenient screwing.

2 -The crimp ring is made of polyoxymethylene, prevents movement and extrusion of the fixed pipe, as well as spontaneous unscrewing.

3 -The sleeve with a press-fit function is made of polypropylene copolymer, fixes the sealing gasket in the correct stable position and limits its extreme compression and deformation of the pipe.

4 -The O-ring gasket is made of nitrile rubber and ensures reliable tightness of the connection with the pipe, even if it is kinked.

5 -The body of the compression fitting is made of polypropylene copolymer, has a trapezoidal thread for the nut and a pipe insertion limiter.

Main advantages

• Easy installation: installation occurs quickly and without preliminary preparation pipes, since the fittings are supplied ready for installation and do not require special skills or additional equipment.
• Ease of repair: when repairing compression fittings, no special skills, additional equipment or a welding machine are required, you only need a plastic or metal compression wrench, and the repair itself occurs by replacing the internal components of the compression fitting.
• Multiple assembly and disassembly: assembly and disassembly of compression fittings for HDPE pipes can be carried out repeatedly up to 10 times.
• Corrosion resistance: there are no metal elements in HDPE compression fittings
• Hygienic: all parts of compression fittings are made from materials that are suitable for transportation drinking water and food liquids
• Connection with elements made of other materials: HDPE compression fittings have standard internal and external threads, so you can mount prefabricated elements for connecting pipes and fittings from various materials.

Properties and characteristics

Compression fittings for PE polyethylene pipes are highly resistant to temperature changes and highly resistant to various chemicals. Compression fittings for HDPE pipes are highly wear-resistant when transporting various liquids and have a service life of more than 50 years.

Due to the wide popularity various types polyethylene pipes, the demand for connecting elements called fittings is increasing. HDPE fittings for pipes allow installation easily and in a short time. Currently, enterprises produce many different connections. Fittings for HDPE pipes are made from various types of polyethylene, copper or brass.

Fittings for HDPE pipes are used:

• For connecting pipes with the same diameter.
• For joining pipes with different diameters.
• For arrangement of branches provided for in the pipeline diagram.
• For installation of pipe turns.
• For installing a plug on a PE pipe.
• For connecting pipes with different fittings.

The connection points of PE pipes must be:

• Reliable.
• Durable.
• Waterproof.
• Resistant to possible exposure to chemical elements.

Classification of fittings

Professional pipeline installers distinguish the connection of HDPE pipes with fittings by:

• Installation method: compression, welded, electric welded.
• Stiffness: flexible and rigid.
• Connectors: detachable and non-detachable.

There is another classification connecting elements:

• Straight, used for joining HDPE pipes of the same diameter.
• Reducing, used when connecting pipes of different diameters.

Let us analyze in more detail the first classification of fittings.

Fittings for various pipe connection methods

Depending on the chosen method of pipeline installation, there are:

• welded fittings;
• electric welded connecting elements;
• compression fittings.

Welded connection elements

Welded fittings can be produced in two ways:

1. method of low tide occurring under high pressure(cast fittings);

1. by butt welding of small sections of pipes (welded fittings).

Welded fittings are available in diameters from 63 mm to 315 mm.

This type of fitting is designed for connecting pipes by welding. The low cost of welded fittings determines a wide range of their applications. Welded connecting elements can be used to make almost all branches and plugs provided for by the pipeline design.

Most often, welded fittings are used during installation gas pipelines and systems in which the temperature of the transported liquid does not exceed 40ºС.

Electrically welded connecting elements

Electric-welded or thermistor fittings are used to install pipeline structures in hard to reach places, that is, where it is impossible to carry out conventional butt welding.

Equipped with heating wire located on the connecting parts. Under the influence of temperature, these spirals heat up and melt the polyethylene pipe. After cooling, a strong weld is obtained.

Compression connectors

Compression fittings for HDPE pipes are designed to connect pipes without welding. With the help of such butt elements, a detachable connection is obtained.

Fittings of this type consist of:

• polyethylene body;
• sealing rings located at joints;
• clamping rings protecting connections from mechanical damage;
• bushings that press the pipe;
• nut covers that securely cover the joint.

Available in various materials. The diameter of the connections varies from 16 mm to 110 mm.

Features of installation with compression fittings

To correctly connect pipes or make the necessary branches with compression fittings, you must follow the following instructions:

1. The HDPE pipe is prepared and the compression fittings are unscrewed several turns.
2. Markings are applied to the pipe indicating the depth to which the pipe must be inserted into the fitting. Before installation, it is advisable to lubricate the section of pipe intended for joining with water or a light soap solution.
3. Up to the drawn mark, the pipe is inserted into the prepared fitting. For the PE pipe to completely fit into the sealing ring, force will be required. Otherwise the connection will not be tight.
4. The cap nut is tightened until the end of the thread.

At correct installation compression fittings create a fairly strong and tight connection.

Separation of fittings according to connection rigidity

According to the degree of rigidity, fittings are distinguished:

• Tough. Such connections completely eliminate the possibility of pipe movement.

• Flexible, in which longitudinal movement of pipes by 3 - 5 mm and rotation of pipes at a small angle are allowed. When using a flexible fitting, all the properties necessary for the connection point are preserved unchanged.

Flexible connections are most suitable for laying pipelines in the ground, but are also more expensive. Therefore, they are used only in cases of extreme necessity.

For the installation of simple pipeline systems, rigid fittings are often used.

Types of fittings distinguished by the detachability of the connection

When installing a pipeline, both detachable and permanent connections may be required. This is determined by the location of the pipe joint and its application. For example, HDPE pipes for water supply: fittings at the first stage of installation are used to connect the pipeline with pumping station. At some point in time the pump may need to be replaced and a detachable connection will make the necessary work as simple as possible.

Detachable connections

In most cases, installation is carried out with the compression fittings described above. But there are other ways to arrange such a junction:

• Flange connection. A cast or brass flange is attached to the pipe by welding. This type of connection is mainly used for large diameter pipes or joining a polyethylene pipe to a metal one.
• Threaded connection. Pipe fastening is carried out using threads prepared in advance on pipes and fittings. Considered the least reliable. Can be used for laying cable pipelines or systems with low fluid pressure.
• Socket connection. It is used extremely rarely. It is carried out by fixing one end of the pipe in the extension of the fitting or the other end of the pipe. Most often used for laying cable pipelines.

For detachable connections, brass fittings for HDPE pipes can be used.

Permanent connections

Permanent connections are most often used to connect structures located underground or in concrete, since this type is considered the most reliable. Pipe welding can be carried out in the following ways:

• Butt. The most common method of joining pipes of the same diameter;
• Socket welding. For this method of joining pipes, fittings with an internal diameter equal to the same parameter of the pipe are used.
• Press or edge welding. It is used for joining pipes to structures, for example, wells.
• Electrofusion welding. It occurs using electrofusion couplings and is considered the most reliable connection method.

To create a permanent connection, cast and electric-welded fittings are used.

Types of fittings

All fittings differ in their design features and, accordingly, the scope of application. Depending on this, fittings can be divided into:

• Couplings come in three main types:
  • Equal bore, connecting pipes with the same diameter.
  • Compensation, mainly used to switch to a pipe with a smaller diameter.
  • Flanged, used for joining pipes with a large diameter.
• Adapters. With their help, various fittings or another type of pipe, for example, metal, are connected to the pipeline.
• Bends. They are used to change the direction of pipes and rotate the system. Standard bends are available with the ability to rotate 45º, 66º or 90º. Some companies produce fittings according to customer specifications. If installation of the system requires bends with a different degree angle, then such a fitting can always be ordered from the manufacturers.
• Saddles. Designed for arranging various branches. The saddle for the HDPE pipe can be of two types:

• Clamps that compress pipes from all sides.
• Slips used to cut new piping into an existing system.

• Crosses and tees. They are used for installation of pipeline branches and for connecting other devices to the network.
• Plugs. Used to temporarily shut off incoming liquid or gas into a pipe.

A certain type of fitting is intended for installation of a certain pipeline structure.

Fittings are produced to facilitate the assembly of polyethylene pipes. A correctly selected set of connecting elements will minimize the time required to install the pipeline system and greatly facilitate the work of connecting pipes.

Add to bookmarks

Connecting fittings for low pressure polyethylene pipes

HDPE ( polyethylene pipes low pressure) are one of the most modern and popular products for the construction of pipelines for various purposes. In turn, each of them has an inlet and an outlet, and almost each has different shut-off valves and branches; accordingly, this requires fittings for HDPE pipes.

Types of polyethylene pipes depending on the purpose.

There are a large variety of them for HDPE pipes, which can be divided according to the principle of joining with the product. How to understand this diversity and how to choose one or another shut-off valve correctly?

All types of HDPE pipe connections are divided into:

• by rigidity: rigid and non-rigid (elastic) connection;
• by connector: detachable and permanent connection;
• according to the method of making the connection.

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

Permanent connection

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

Butt welding diagram.

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 of internal water supply and heating networks, and “hand irons” are used. If in welding machine products are fixed with particular precision relative to the joining place, then when performing work manually it is necessary to pay Special attention relative position of the products, and it is best to fix them with some kind of device before the seam hardens.
2. Socket welding - has the same principle, except that this method uses fittings for HDPE pipes with an internal 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 internal diameter of the fitting.
3. Edge (press) welding - is mainly used for welding a product with the entrances of wells, etc., where it is necessary to weld the pipe to a plane that is larger in size than its diameter. For this purpose, special PE electrodes are used. This method used only in non-pressure systems that do not require absolute tightness.
4. Electrofusion welding - the welding process involves melting polyethylene, while the fittings and HDPE pipes must also have the same diameter. However, this method requires the use of a special coupling. The coupling has a heating mesh fused during production and two contacts. Each such coupling has a barcode. If an automatic welding machine is used, it independently reads the data and sets the optimal welding parameters. Otherwise, these parameters must be set manually.

Electrofusion welding scheme.

Plug-in connection

Based on the fact that all welded fittings are permanent connections, shut-off 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 large diameters, 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 types. As a rule, they are used when there is a threat of shock loads on a given connection.

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

Flange connection - 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 polyethylene pipeline 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 are equipped with a plastic outlet, which is designed for a welded connection with a polymer product.

Threaded connection - an external one is used, which is cast on one of the ends of the pipe, and an internal one - on the other connection pipe or fitting. This connection is considered by experts to be not 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 standard diameter one product, inside an extension at the end of another product or fitting. As a rule, this connection is used when installing a free-flow drainage system (sewerage) or when laying cables.

Types of fittings

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

Types of fittings for detachable connections of HDPE pipes

1. Equal coupling - produced with the same diameter at both ends. Used to join individual pieces of pipe or other elements with the same diameter size as the pipe.
2. Compensation coupling - used to change the diameters of the pipeline or install an element with a larger/smaller size
3. Thread-plastic connection. When joining, for example, polymer and metal reinforcement, a combined fitting is performed. An embedded element with external or internal thread, it is usually made of brass.
4. Flanges - used for mounting removable fittings or joining pipes made of other materials. There are combined and PE. Flange couplings are a type of them.
5. Bends. Of course, polyethylene is a fairly flexible material, but you still shouldn’t allow it to bend too sharply. The use of bends allows the pipeline to significantly change direction. According to the standard, there are bends for bends of 45°, 66° and 90°.
6. Crosses and tees - with the use of such fittings, the pipeline can be connected to required quantity other parts of the network. Branches can be of the same or different diameters.
7. Plugs. This type of fitting allows you to preserve “blind” HDPE pipes. This situation may be, for example, if it is necessary to decommission a certain section of the water supply system, 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 the relatively low price and high performance properties of HDPE products, this ensures polymer material deservedly high popularity both among private consumers and installation organizations.

Currently, when laying communication lines for various purposes, low-pressure polyethylene pipes (LDPE) are often used. Their installation is carried out using special fittings, which include ball valves. Next, we will look at what these products are, what they are like 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 that 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 shape 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 using a lever. In large diameter taps (150 mm and larger), the locking mechanism is controlled by an electric, pneumatic or hydraulic drive.

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

Advantages

The shut-off valves under consideration have many positive qualities, among which are:

• Durability - the product can last 25 years or even more. Durability largely depends on the operating conditions of the product.
• Reliability due to the simplicity of the design.
• Low price due to cheap materials.
• Low weight of products.
• High degree of tightness.
• Due to the fact that the device is made of plastic, it is not subject to corrosion, and practically no sediment settles on it.

Flaws

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

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

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

Types of shut-off valves for HDPE

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

• Collet (compression);
• Flange;
• 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 ease of installation, which can be done with your own hands without the use of special equipment and without having the skills to do such work.

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

As a rule, these shut-off valves are used in domestic water supply systems. Below are the main characteristics of these devices:

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

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

The photo shows a flanged polyethylene valve

Flanged

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

Unlike devices of the previous type, flanged shut-off valves can withstand greater pressure. Often this shut-off valve is used in chemical industry, since they are resistant to acids and alkalis and are not subject to corrosion.

Welded

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

Welding can be done in two ways:

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

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

Conclusion

Polyethylene ball valves are reliable shut-off valves used for various types of pipelines made 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 glean some Additional information on this topic.