Union nut American sizes. Detachable connections in plumbing

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An American with an internal or external thread is used by all experienced pipeliners. With this prefabricated quick-release pipe fitting, two risers can be securely connected.

The design is a collapsible combined coupling, the structure of which provides for the presence of 2 and a union nut.

American women types

The versatility of the device lies in the fact that the device is connected to the pipeline system with just one union nut.

Classification by purpose

According to the functional purpose and design, an American-type threaded connection can be:

• flat. This option is quite compact. The tightness of the connecting part is provided by a gasket. Over time, it is necessary to regularly tighten the nut, if necessary, change the used gasket. Given this fact, it is desirable to mount this type of connection in places with good access to it;
• conical. It is not equipped with a gasket, since the conical structures are highly polished, and when mounted they fit very tightly to each other.

Important! It is necessary to ensure that the deviation of the pipes along the axes does not exceed 5⁰. Otherwise, the bond may not be airtight.

Since the reinforcement part is used at very important joints of pipeline elements, it must be carefully checked for possible hidden defects.

Important! The conical type of product is considered more reliable. Therefore, with its help, they connect parts that must function flawlessly in conditions of sharp temperature changes.

Fastening using the design is increasingly being used in the laying of pipelines, pushing into the background the squeegee-coupling device with a lock nut.

Types of threads respectively

If we classify products by thread, then we can distinguish 3 types of connecting structures:

• "mom-folder";
• "mother-mother";
• "folder-folder".

Advantages

The fastening structure is different:

• reliability;
• fast, easy assembly and dismantling. By turning only the union nut, in a matter of seconds, the joint can be mounted without any rotation of the risers. This fastening cannot be compared with a squeegee-coupling type connection, for the implementation of which many different parts, tools, materials are required;
• the ability to create straight and angular joints;
• compactness;
• reusability, since the assembly-disassembly process can be carried out more than once, which does not affect the quality of subsequent fastenings.

The last two conditions entail significant cost savings, which is of great importance to most citizens.

In addition, due to the ease of installation, most manufacturers of plumbing equipment began to design branded faucets, meters, filters in combination with a fastening structure.

The versatility of the device lies in the fact that with different combinations of fitting connections, American straight and angular types are assembled to each other, designed for fastening pipes of various diameters. More often than others in such cases, GOST 8959-75 is used.

The use of cone-type devices makes it possible to ensure high tightness of metal-to-metal joints without using gaskets. This know-how helps to increase the service life of the parts.

disadvantages

Probably the only "minus" of this is its high price. It is this factor that can cause the choice of a different type of fastening of the risers to each other. Although, it is also characterized by a high cost. So the choice is yours.

About connector assembly

Those who have not dealt with this connecting structure are often asked how to twist an American. Let's say right away that there is nothing complicated, you just need to have some information about the structure of the fastening unit and have elementary skills in working with keys.

So, to tighten the union nut, you can use an adjustable or regular open-end wrench.

Important! When installing the connection, do not use a gas (pipe) wrench, as the chrome or nickel coating may be damaged.

Important! When using union nuts with a decorative coating, plywood or plastic turnkey gaskets must be used. Otherwise, you run the risk of being left without decoration on the union nut.

If you need to fasten the metal-layer using the device, you need to use the internal key. Its cross section is a hexagon, it can also be in the form of a cylinder with two notches (engages). Used for mounting press fittings.

Internal key

When this device is not available, they use pliers, other improvised parts or tools. But the key still needs to be purchased if you are going to mount not one connection, but the whole system ().

Anyone with metal on “you” can make a key for a cone of the required size. The cone-shaped end of the tool is necessary in order to accurately get into the recessed hooks. The key is L-shaped with a handle length of about 150-160 mm. For its manufacture, profile fittings (trimmings) are used.

Mounting algorithm

Using an element of pipe fittings, it is quite easy to connect.

In order for the joint to be of high quality and last for many years, it is recommended to adhere to the following algorithm:

1. Make a drawing of the future pipeline, on which mark the locations of the connections, apply the distances between them.
2. Prepare pipes. That is, you need to cut them into the necessary pieces, chamfer.
3. Carry out calibration (editing) of the ends of the risers. This technological process is necessary in order to ensure high-quality pipe joints.
4. Install a fitting on the end of the pipe, tighten the fitting not very much, correct the correct installation of the part, and eliminate possible problems. If there are no distortions, and it is visually visible that the device is placed correctly, tighten the union nut.

Important! Try to tighten the union nut as tightly as possible to ensure that there are no leaks.

Those who work with the structure for the first time, and before that, for example, dealt with threaded galvanized fittings, may have doubts about the tightness of the fastening. To be sure, they wind the FUM tape under the thread or, although this is not necessary. The connection reliably seals the joints. Whoever connects the pipes at least once with the help of an American will use it all the time.

About Applications

The American fitting, like the polypropylene pipe itself, is used for the installation of various kinds of main pipelines.

It is used when laying:

• heating systems;
• plumbing for hot and cold water;
• gas pipelines;
• sewer systems, including magnaplast plastic sewerage, other pipelines.

American - the most common, convenient, reliable, in some cases an indispensable fastener.

When mounting a water meter at home, one cannot do without such a reliable part, since the “entrance” and “exit” can be perfectly done only with the help of this fitting.

Important! The ease of use of the connection can be seen when dismantling the water meter for inspection or repair, since the fixture can be easily unscrewed.

When installing heating radiators, this fastening device cannot be dispensed with. In some situations, the fixture is the main node of the heat or water supply system.

When repairing radiators of a heating system, the use of a fitting significantly reduces repair time and simplifies system assembly.

The device is able to function efficiently in conditions of high pressures, sudden changes in temperature.

Due to the presence of various modifications of connecting devices, it is possible to quickly and easily fasten plastic and metal-plastic structures, metal and plastic products, plastic risers.

Using an American, you can mount almost any connection of pipeline elements.

In many cases, even those with a flange connection are successfully mounted. To do this, a thread is welded to the flange, after which they continue to connect the elements of the system with the help of an American. This is also what makes this truly versatile piece of pipe fittings unique.

The design fits perfectly with steel welded tees, steel bends, spurs, couplings, taps, steel pipes, and other parts of pipelines.

These and other elements of pipelines are used for laying risers in bathrooms, kitchens, country houses, and other buildings. The reliability of the connection with the help of an American makes it possible to install special bathroom furniture in the bathroom, since the possibility of direct contact with water is excluded.

A novice plumber or a simple layman can mount the fastening of risers using an American. It's all about the simplicity, and at the same time, the versatility of the connecting structure.

A coupling is the most widely used plumbing fitting in civil engineering, designed to connect separate parts of a pipeline. A detachable threaded type coupling allows you to assemble a whole branch from individual blanks, consisting of an almost monolithic pipe.

It is not surprising that couplings are now used almost everywhere. We will consider a variety of such products invented in the USA. An American coupling is subject to consideration - designed for pipe assembly. What is so convenient about it and why is it so popular? Now you will know.

Article content

Design Features Differences

The standard threaded coupling is intended for the assembly of pipes and pipelines. The impossibility of creating an efficient water supply or heating system from a single pipe. Yes, it can be bent and connected to other, large branches, but this will significantly complicate the work without providing serious advantages.

It is customary to assemble pipes using fittings. Coupling as a fitting - performs the simplest and most common task - fastens pipes together, forming straight or angled joints.

Threaded couplings are much more common than others, because they made it possible to collect full-fledged branches from individual pipes, but at the same time leave them in a modified state. If the branch needs to be somehow modernized, improved or simply disassembled, it is enough to unwind the coupling.

Problems with standard threaded connections enough. This and:

• weak tightness;
• high weight, the need to cut the return thread on the desired side of the pipe;
• the need to rotate pipes, etc.

The main problem lies in the design of standard type threaded connections. The thread must be unscrewed in order to disassemble it. To do this, you need to rotate either the pipe or the fitting, which adds problems.

American as a coupling - it was conceived just in order to eliminate such shortcomings and give plumbers a convenient detail.

The American turned out to be a truly universal model of plumbing. Its design, unlike a conventional threaded coupling, is completely collapsible and consists of at least three parts.

Two of them are counter threaded ends that are screwed directly into the pipe cavity. They can have an external or internal thread, it all depends on the specific design. The third part is a union nut used to fasten the two previous ones.

The beauty of the whole design is in its conciseness. The detachable system allows you to connect fittings or ends on pipes by rotating a separate nut. No need to twist the pipes, the fitting itself, the body of the coupling. Just connect the parts of the coupling and tighten the nut until it stops.

Rubber gaskets are attached to the inner ends of the coupling parts. They are needed to improve the sealing of the connection.

Advantages and disadvantages

What are the specific advantages of an American type coupling and how it is useful when fastening pipes.

Main advantages:

• American is easily installed on any type of pipe;
• the ability to form transitions, corner joints, connect taps and any other plumbing;
• high level of tightness;
• market availability;
• good quality and performance;
• the idea with a union nut simplifies installation and dismantling;
• a large selection of a wide variety of products for every taste and budget.

The advantages are traditionally considered ease of use and tightness. As we noted above, the standard connecting thread on a conventional coupling cannot boast of tightness or ease of installation. The American saves us from such problems when assembling pipes into a single structure.

As for the cons, the only thing that can somehow affect your decision is the price. An American is an order of magnitude more expensive than a conventional threaded coupling. However, compression joints also cost their customers more, so there is nothing unusual here.

Types and differences

How many types of pipes there are in modern plumbing, so many fittings are needed for them.

Any detachable connecting part must meet the pipe in several ways at once. Only in this case it will be fully usable. Such a requirement is quite logical.

One of the most important points here is the material. If, for example, polypropylene is used as a material for pipes, then it is stupid to screw steel fittings to it. Polypropylene is a polymeric material, so polypropylene should be the main mating fitting. The same is true for any metal products.

According to the material, Americans are divided into:

1. Steel.
2. Brass.
3. Copper.
4. Polypropylene.
5. Polymer.

A steel split coupling for pipes is the most famous way to assemble them into a single structure. Steel is moderately cheap, very functional and durable. If we forget about its susceptibility to corrosion, there would certainly be no competitors for it.

However, the situation is different. Clean steel without treatment in a few years will begin to show signs of destruction. Galvanized will last a dozen, stainless will probably withstand two, which, however, does not save us from the initial problem.

Sooner or later, the steel fitting will begin to rust and turn sour, then its path is only for remelting.

That is why now they are more willing to buy brass models. Brass is a metal from a special group. With characteristics similar to steel, it does not cause a reaction to moisture or time. Brass fittings, even after 50 years, will be in the same condition as before.

Copper samples are an expensive option for those who have the entire piping system assembled from copper. Copper is superior to steel and brass in every way, except for strength.

Polymer fittings and adapters

Polymers such as polypropylene are increasingly being used to assemble civil water systems.

This assembly is carried out gradually, not everyone has the money, time and desire to completely change the pipes in the house. Obviously, the collapsible system in this case is faced with a problem.

You need to somehow combine different materials with each other. For example, polypropylene and steel.

Polypropylene, as a polymer, does not cause a response in steel, however, it is impossible to simply take and screw a fitting into a steel pipe, the main production material of which was polypropylene. You can't weld them either.

To solve such problems, a detachable variety of American women, called adapters, is used.

An adapter is a fitting consisting of combined materials, intended for assembling pipes from different materials. A detachable American of this type, on the one hand, will be a steel end with a thread cut on it. On the other hand, it is filled with polypropylene.

It turns out a very convenient detail that allows you to assemble the pipes into a single branch without destroying their identity. Each end interacts with its own material, and the tightness is ensured by a gasket system together with a union nut.

An overview of the features of American women (video)

Differences in thread type

American women differ not only in terms of materials, but also in the very principles of design. They also differ in terms of specific solutions. For example, on different American women there may be different types and directions of thread.

There are samples with external threads, with internal threads, with combined components, where the thread for different parts of the American is different. This distribution slightly complicates the process of choosing a fitting for beginners, but greatly simplifies the work of professionals.

Its charm is the ability to choose an option that is ideal for your conditions. It doesn't matter what threads your pipe has and what that pipe is made of, you will find a working solution anyway.

In the event of the loss of one of the components, it will not be difficult to find a replacement for it.

Plumbing assembly is considered to be of high quality if all connections are sufficiently tight. In practice, this is achieved through the use of various fittings, nuts, gaskets and other connecting elements used in plumbing work. Such elements are quite suitable for effective use, but at the same time, there is a much better solution in the form of a universal nut, known as the "American".

Let's figure out what "American" is and why it has gained such great popularity.

The American plug connection is a kind of nut that finds its application when it becomes necessary to connect two pipes. Previously, spurs were used for this, which are still found today, since their cost is significantly lower compared to the connection of the type in question.

The use of "American women" in plumbing makes it possible to simplify the process of connecting two fixed pipes as much as possible. For example, you need to connect a faucet and soldered wiring. Both in the first and in the second case, the pipes cannot be twisted, and, possibly, the thread is located close to the wall, which excludes the use of the same corner. It is in such situations that the "American" comes to the rescue, providing a connection due to the rotation of the nut, which is part of its design:

• two fittings;
• pad;
• hex nut.

Pipe connection options

The connection of the "American" type is provided due to a certain variability of the connection to the pipe, which involves the use of:

Types of threaded connections

The thread of the "American" can be conical or cylindrical. A similar variability is present in the case of fittings, the connecting surfaces of which differ in the mentioned shapes.

As for the conical seal, it has a certain set of advantages:

• ensuring the tightness of the connection without any gaskets, FUM tape, flax fiber, etc.;
• resistance to various kinds of influences, for example, temperature extremes, which is achieved due to the homogeneity of the material in terms of its chemical composition and physical characteristics;
• preservation of tightness with deviations of the axes of the connected parts up to 5 degrees.

The mentioned advantages in relation to the conical elements of the "American" are achieved due to the high precision of their manufacture, which can be neglected to a certain extent when it comes to flat seals. Here, the use of a gasket in the form of a ring is sufficient to achieve the required tightness even when the surface of the connecting elements is not distinguished by high-precision processing.

In the production of "American women" steel of various grades is used. Although AISI steel under the numerical designations 304, 316 and 321 is more popular. Steel marking also includes an indication of conditional pressure (PSI) and size in inches.

Gusset

For the convenience of organizing turns, an "American" is produced, providing a corner connection. Usually this is in demand when there is no possibility of arranging piping. At the same time, it is possible to save money, since in this case one less connection is established.

Coupling

A coupling is a fitting that provides a connection between pipes or makes it possible to organize a transition from a pipe of one diameter to a pipe of another diameter. The “American” is identical in functionality to a standard coupling, one part of which is screwed, soldered or welded to the pipe, and the other provides for the installation of a collapsible connection.

Crane "American"

Ball valves are the most popular elements of shut-off valves, of course, provided that they are manufactured in accordance with the required level of quality. There is a huge mass of these products, among which there are taps oriented, for example, to some special use or performing decorative functions. At the same time, there is also an “American”, supplemented by a ball valve.

Many people know that this type of crane exists, but only a few have used it in practice. This state of affairs is due to simple ignorance of all the advantages of this product. Meanwhile, with its help, you can replace such an element of plumbing as a squeegee - a part for connecting two pipes, where a long thread is applied on one side, and a short one on the other, which is complemented by a coupling and a lock nut. In the proposed version, everything is much simpler, since it provides for the tightening of the crane and the element in the form of the “American” itself due to the slight use of the wrench. These two parts are self-centering, which facilitates the process of their installation.

Often, the "American" faucet is used when installing heating radiators, which leads to some positive aspects. The connection of these connecting elements makes it easy to dismantle the radiator, and the presence of a tap makes it possible to regulate the water supply, which allows you to influence the temperature in the room.

Like all types of ball valves, the "American" is equipped with two types of handles, where one should be understood as a butterfly, and under the other - a lever. In the first case, these are cranes with a small section, characterized by the absence of the need to apply too much force to turn, and in the second case, cranes with a large section, the operation of which is associated with the application of a greater force.

Assembly

The “Americana” union nut is tightened with a standard open-end wrench or a union version of this type of tool is used. Some try to use a spanner, which is not recommended as it may damage the nickel plating. If there is a decorative coating on the nut, rubber or plastic gaskets should be used, and plywood can also be used.

The installation of "American women" on metal-plastic pipes involves the use of a special tool in the form of an internal key. It is necessary for tightening the press fitting during installation. Typically, such a key is in the form of a cylinder, complemented by two recesses that are necessary for the hooks, but a hexagonal version is also available.

Instead of an internal key, an improvised tool, such as pliers, is often used, which increases the likelihood of damaging the product in question. When one-time work of this plan is supposed, that is, it is necessary to install only one connection of the "American" type, then this approach is justified to a certain extent, but in the case of installing several pipes, you should still take care of buying a special tool.

If you have the skills to work with metal, then you can easily make your own cone wrench of the required size. Tapering is necessary to ensure that it enters the existing recesses. Profile fittings can be used as a material for making a key.

For the "American", the diameters of the internal and external threads of which are defined as 1/2, a key is required in accordance with such dimensions as 12 by 12 mm and 10 by 10 mm. The shape of the key should resemble the letter "G", having a handle length of 150 mm.

Materials for the manufacture of "American"

The production process of "American women" is based on the following types of materials:

• cast iron;
• nickel;
• chromium;
• brass, chosen due to the fact that this material is able to withstand high temperatures of the coolant, reaching 120 ° C;
• stainless steel (ISI304, AISI316, AISI321) ;
• combined, including propylene.

Of the above materials, stainless steel is worth mentioning again, as it provides the ability to produce the most durable "American". Although consumers of these products often prefer copies made of chrome, as this material combines quality and practicality. It also does not require the installation of a gasket for "American" chrome to ensure the tightness of the connection.

If pure steel is used for the production of the type of product in question without special treatment, then after a few years such a product will begin to collapse. Galvanized can withstand about 10 years, and stainless - about 20 years.

Conical or flat?

Conical "American", supplemented with a rubber seal, provide tightness due to internal pressure, in this case, the union nut can even be tightened by hand. As for flat sealing options, it will be necessary to provide the necessary contact pressure.

Mandatory tightness of the connection can be provided by both a conical "American" and a flat one. At the same time, flat ones make it easy to change gaskets, which are not in short supply. And for conical ones, special gaskets are needed, which differ in a non-standard size. In turn, conical ones without gaskets should not be chosen, since in order to create a tight connection, it is necessary to tighten the nut very tightly, which is unacceptable if the pipes, for example, are plastic.

Conclusion

As you can see, an American in plumbing is already an indispensable part. That is why it is so widespread.

Company " Center Metal» manufactures specialized threaded fittings for connecting pipelines without welding. All connections are detachable and quickly assembled. Such threaded fittings allow you to connect pipeline elements without welding. They are used in explosive and aggressive environments where welding is prohibited or technically impossible. Our American connections simplify the installation of pipelines in hard-to-reach places.

Compound production American Du 15–100(American connection). From steel, stainless steel 09G2S, 40X, 0812X18H10T, AISI 304, with various threads: conical NPT, metric M, inch G, for welding, etc.

The production of corner joints DN 15–100 has been launched. Corner Americans change the direction of the pipeline by 90 degrees. Corner detachable connections are available in two types: with external and internal threads. We are preparing to launch a series of parts with nickel and galvanized coating.

Nipples according to GOST 8967-75, (GOST 8958-75, 24502-80, 13956-74), fittings made of steel, black and galvanized DN 15–300, materials st20–45, 09G2S, 40X, 12X18H10T and other steel grades at the request of the customer. Production of a fitting according to drawings and sketches, in accordance with GOST, OST and TU (transitional couplings, elongated spurs and threads).

Connection americanconsists of:

• union nut (American coupling);
• clamping fitting;
• nipple;
• gaskets (supplied as an option).

Development, production and testing threaded connections with pressure up to 120 atmospheres and above. Production american women: welded, threaded, transitional, coupling-coupling, welded from steel 12X18H10T, 08X18H10, 09G2S, 40X, 20X13, st. 20..45, brass LS 59 with conical and inch threads, with metric fine and coarse pitch threads, with NPT, BSP threads.

Production and design of non-standard connections (piping) for gas and powder fire extinguishing systems.

The production of seamless high-pressure connecting threads has been established for joining various fire pipes (diameter 22x3.5, 30x3, 38x3, 45x3, 57x3.5). We assemble high-pressure pipelines for fire extinguishing systems according to schemes with various threaded connections (taper thread, inch thread).

Detachable connections for pipelines (American) are produced with various seals:

1. cone seal- scope: pipelines of the chemical and oil refining industries, pressure up to 25 MPa;
2. seal with gasket(poranit) is used to connect water and gas pipes (American plumbing), working pressure up to 16 MPa;
3. ball seal in accordance with GOST 24487-80, it is used to connect hydraulic pipelines, pressure up to 56 MPa.

You can buy an American connection by sending a request by e-mail or by calling:

Our American women are used for pipeline connections as quick connectors. BRS (quick couplings) when connecting pipelines with water or gas, a mechanical seal is used, for aggressive media such as petroleum products, superheated steam, alkali, etc., a ball or conical seal is used. American connection for pneumatics and hydraulics of small diameters (DN6, DN8, DN10, G1/8, G3/8, G1/4) with a cone seal made of 08x18n10, 12x18n10t, zinc coated 12x1mf.

Developed and launched into a series of connections for gas pipelines. Detachable connection is made of several types: for welding and with threaded ends. This product is available in two types: angular and straight GOST 8959-75. You can buy an American by sending an application by mail.

This is the name of the type of threaded connection of pipes in water supply and hot water systems. With the appearance on the market, the American quickly gained popularity among plumbing specialists due to the ease of installation and the reliability of joining pipeline elements.

If you need to connect pipes - an American is ideal. Indeed, later, when performing repair work, there is no need to dismantle part of the network.

It is impossible to assemble a pipeline from a single pipe. It is necessary to perform rotations and connections of pipeline elements in order to obtain the desired configuration. Fittings have always been used to make joints.

You can also install using a coupling, which in the standard version is a threaded part. When connected, it is screwed onto the threaded part.

The next part is rotated into the clutch and such an operation (especially if all the elements are large) is quite a tangible inconvenience.

What is an American

• threaded fittings - are attached to one part of the water pipe at the connector point;
• reciprocal branch pipe with a shoulder - is installed on the second end;
• union nut - is installed on a fitting with a flange before it is installed in its location.

Further, when tightening the nut with pressure on the shoulder, the fittings are tightened one to one and these two parts are compressed. Gaskets are used to ensure the tightness of the docking with the help of a coupling. And with a conical joint, it is not required.

If it is necessary to dismantle the section docked by means of an American, it is enough to unscrew the nut, while the mating elements of the pipeline remain motionless.

Types of docking nodes. The number of design solutions for installation corresponds to the number of varieties of molded products.

By type of materials used

It provides for the use of homogeneous elements, primarily in order to avoid electrolytic corrosion, therefore fittings are produced in various designs:

1. . The life cycle of such parts is also limited by the tendency to form lime deposits from water on internal surfaces.
2. Copper- less susceptible to corrosion, they are used only on pipelines made of the same material.
3. brass- the most popular in application, resistant to oxidation, durability is at least 50 years.
4. Polypropylene- in terms of strength characteristics and ease of use, they are increasingly competing with metal products.
5. Polymer– have all the advantages of plastic products. For polypropylene pipes - American is the best type of connection.
6. Combined- are used as adapters when joining pipes made of metal with plastic ones during partial replacement of the pipeline. To make such fittings, a threaded metal part is pressed into a plastic body.

By type of assembly method

In addition to differences in the materials of manufacture, the threaded connection differs in the design of the docking units.

They are threaded, with different threading directions, having internal or external threads on the sides. Samples with a conical joint are also used, with the help of which an American connection is made using a persistent compression ring under the nut.

Video

Such a variety of fittings creates certain difficulties in choosing them for an inexperienced person, but it gives real pleasure to professional performers.

Surface protection method

What are American women by type of protective coating? Steel and cast iron products are coated with a protective nickel or zinc coating to protect against corrosion.

For plastic or stainless analogues, protection is not applied. In this regard, it is recommended to use linings for pipe wrenches or special wrenches with internal engagement of the part.

Docking metal components

Pipelines for various purposes made of metal are still widely used in plumbing. Therefore, the installation of metal pipes is widely used in a variety of options.

For simple joining, threads must be cut at the ends of the elements to be assembled using a standard threading tool. The American is screwed onto the prepared ends, while it is necessary to seal the threads by winding the FUM tape or strands of flax fiber.

The final connection is made by tightening the nut and installing the gasket. If the connector is reused, the gasket must be replaced. The joint is reliable and maintainable. What are Americans for metal components:

• direct connection of metal pipes;
• installation made at right angles, as well as angles of 30 and 45 degrees;
• installation of cantilever water supply elements with a pipe, such as taps, mixers, air vents;
• threaded connection to change to a different diameter;

American allows you to get a sealed joint in pipelines of any configuration.

Docking of plastic components

The connection of the components of pipelines made of composite materials has its own characteristics. Docking of polypropylene pipes is carried out by welding with special equipment. The process is very simple and is carried out on site during the installation process.

Video

Designs are widely used where docking with a polypropylene pipe is made on conical American women, where devices with a sealing ring are used.

The connection of polypropylene pipe-rolls with an American is the most reliable and almost the only way of docking using a detachable coupling, including connecting a heated towel rail.

Several types of connections are used for polypropylene pipes:

• coupling with external thread;
• coupling with internal thread;
• device with simultaneous use of internal and external threads;
• angular, produced with an angle of 30, 45 and 90 degrees for installation in hard-to-reach places.

Installing a towel dryer

The installation of such a device in the bathroom can serve as an example of using a threaded connection for inserting additional equipment. The heated towel rail is connected either to the heating system or to the hot water circuit.

Video

In the second case, you will have to use the services of the DEZ to turn off the DHW riser for several hours, in the first case, you will have to wait until the end of the heating season.

Work can be performed in the following order:

1. Install the dryer in its permanent location.
2. Make a tie-in into the DHW or heating riser with the installation of threaded fittings for inlet and outlet flows.
3. Install corners with ball valves on them.
4. Connect the heated towel rail through plastic pipes. The critical temperature for them is 95 degrees, in neither system such a temperature is used.
5. On the upper register, install a valve to bleed air from the system, otherwise the air lock may interfere with the circulation of the coolant.
6. Check for leaks in the dryer by opening the inlet and outlet ball valves. If there are leaks, you need to re-check the joints by applying additional seals on the threads. Linen tow, fluoroplastic sealing material (FUM) in the form of a tape or cord are suitable for this.
7. The installation of ball valves will allow for repair work without disconnecting the riser. It should be noted that the connection of a heated towel rail with a polypropylene pipe requires a careful attitude, since the clamping ring cannot always be reused due to its deformation.

Connecting the heated towel rail to the riser with a polypropylene pipe using conical American women allows you to avoid the use of pipe benders. This reduces the complexity of work and their adjustment in place.

An example of connecting a heated towel rail through a threaded connection is shown in the figure.

Coupling element dimensions

In domestic plumbing standards, American women are classified as "sleeve connections with a union nut."

Naturally, their size range corresponds to that on the molded elements of water pipes. What types there are depends on the method of docking to the main line or console element.

Video

So, when installing a faucet or faucet, as an element of plumbing, American women are used in sizes from 3/8 to ¾ inch with conical threads. This allows you to make a reliable installation in just a few turns of the nut.

For water pipes, they are used in the range of 10 - 50 mm, the maximum indicator is typical for connection with a heated towel rail.

To connect pipes made of polymers, special couplings are used - conical American women, on which the plastic sheath is literally pulled by the force of the screwed nut through the thrust ring, providing a tightness of the joint many times greater than the pressure in the system.

Pipe dimensions

For an American woman in plumbing, threads can be selected based on the data shown in Table 1.

When using plastic pipes, the properties of the material must be taken into account. such as elasticity, plasticity chemical resistance.

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Therefore, for polypropylene products, an American is practically the only connection method that provides high-quality docking. Applying them locally, it is possible to assemble a pipeline of any configuration with a high degree of reliability.

For installation by means of an American, its dimensions must be adequate to the pipes used. For cold and hot water networks, this is an inch or an inch and a quarter; for heating systems in a private house, it is better to use one and a half inch products.

When using plastic products for drip irrigation systems, it is sufficient to apply half-inch sizes.

It should be remembered that a temperature of 95 degrees is critical for polypropylene pipelines, this parameter must be controlled when connected to heaters. The temperature at the outlet of the device may be above the permissible limits.

When partially replacing the water pipe with a plastic one, the American is used as an adapter.

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When installing with American women with a protective coating, you need to use a special tool that does not damage the cladding layer.

When selecting components for the pipeline, it is necessary to take into account their location in terms of accessibility and functionality.

Conclusion

The invention of the method of connecting the elements of the pipeline "American" has become a revolutionary event in the field of installation of plumbing systems of any complexity. As a result, such a complex process has become accessible even to performers with minimal skills in this area.

Without a doubt, complete this type of connections and success to you!

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