Check valve The water heater is inexpensive (from 160 rubles), externally not noteworthy, and it is simply not known to many of the purpose. Therefore, the obligation of its installation by some "advanced" clever seems optional to the execution of twagrevous plumbing. But after all until time. After the water heater is once exploded, passing the need for the need to use the return valve for the water heater, unfortunately, somewhat late. Learn about other people's mistakes, gentlemen!

What is the return valve in the water heater

The check valve for the boiler is sometimes called safety. There are no errors in this. Constructive feature Shut-off valves for the water heater, is that it consists of two perpendicular valves in relation to each other. One of them, located in the tube larger diameterReverse. Another, located in a smaller diameter tube, safety.

The check valve is used to prevent the fluid from leaving the boiler to the plumbing network when the pressure is exceeded in the pressure tank in the cold water supply network (HPW).

Safety valve, in fact, is a reset, automatic deviceWarming under the influence of overpressure at the inlet in front of the valve.

Both devices have the same design, a plate type. Differ, bandwidth and pressure pressure. Speaking easier, the diameter of the pipes and the rigidity of the clamping springs.

How to choose a check valve for a water heater

These devices differ by:

• Nominal pressure (PN). There are: 0.6; 0.7; 0.75; 0.8; 0.85 MPa. About which nominal pressure of a particular safety device can be obtained from the inscription on the instrument housing, but it may not be there. In this case, it is necessary to focus on the lower value that is 0.6 MPa.

The picture is poorly visible, but in fact, the difference between the springs of the reverse and safety valves, is clearly visible in the holes of the nozzles.

Some manufacturers of accumulative water heaters are recommended using a reduction valve () to establish water pressure in the HALL system by 20% below the start of the opening of the safety reinforcement. For example, for a device designed for 0.6 MPa, the pressure in the intravartic network of the HPW should be 0.48 MPa.

Of course, the process of organizing such an adjustment is quite trouble-free. Buying and installing at least one pressure gauge. How to choose a pressure gauge is, but it will be possible to actually control, if necessary, quickly adjust the pressure level, and this is necessary not only for the normal operation of the boiler, but also for other devices. For example, for efficient work.

• Thread diameter. 1/2 "or 3/4" inches.

• The presence or lack of a reset function. A small lever or flag designed not so much for a drain (very slow), how much to control the condition of the safety of safety reinforcement. Contrary to emerging opinion, the lever color does not bear any information about the nominal pressure of the device. Maybe: black, red, blue or yellow.
• Cost. From 160 to 1600 rubles.
• Manufacturers. Italian companies REMER, ITAP. Famous European Concern Ariston and many other nameless Chinese manufacturers.

Nothing says about the pressure of the beginning of the opening of the check valve, but it can be judged about its magnitude from the water heater operating manual. For example, for the "Termex" model, the RZL series, it is said that the pressure in the HALL system should be 0.05-0.6 MPa.

Why the water heater feed valve dripping

It is known that the water located in the closed vessel when heating increases in the volume and will inevitably find ways to exit, even if it takes a metal tank to break.

Therefore, let's take, as a dogma, the fact that the workable safety reinforcement with strong water heating (from 80 °) should be given to flow (slightly drip) from specifically for this intended nozzle, carrying out a discharge of excessive fluid pressure in the tank.

To remove the water that leaks from the drain nozzle is convenient to use the transparent hose from the hydraulic system, with the conclusion in the sewer.

However, if we talk about moderate heating to 60 °, the safety valve may not drip. So, maybe if the following conditions are observed:

• The input pressure should be lower than the pressure starting pressure of the safety valve at least 20%.
• The boiler's tank design should have in its upper, spherical part, a sufficient large supply of an air filled with air performing the role of a hydroaccumulator.

In fact, the practical search for the optimal compromise, between an acceptable temperature, pressure and absence of leaks, is carried out by experimental through a fairly long time. Universal Fashion There are no solutions to this problem. It all depends on specific circumstances.

From proper strapping electric water heater Accumulative type (boiler) depends not only by the life of the equipment, but also the safety of residents. That is how serious things are. And the correct impunity is a safety valve for a water heater for filing cold water.

What is it needed for

Installation of the safety valve prevents pressure from increasing the instrument above the normative. What is the pressure rises? As you know, when heated water expands, increasing in volume. Since the boiler is sealed, excessive things to go there - the cranes are closed, the feed valve is usually worth the feed. Therefore, water heating leads to an increase in pressure. It may well happen that it will exceed the strength limit of the device. Then the tank rushes. So so that this does not happen, they put a safety valve for the water heater.

This is what the installed valve for discharge pressure in the water heater looks

It may not be necessary to put a safety valve, but simply remove the opposite? With a fairly high and stable pressure in the plumbing, such a system will work for a while. But the decision is rooted incorrect and that's why: the pressure in the water supply is rarely stable. Often there are situations where water barely runs from the crane. Then hot water from the boiler pressure to displace in the plumbing system. At the same time, the tagne is taken off. For some time they will warm the air, and then blown.

But blunt-haired Tanes are not the worst. It is much more worse if they are late, and at this time the pressure in the plumbing will rise sharply. Water evaporates on the hot heaters evaporates, there is a sharp increase in pressure - jerk - which leads to a guaranteed rupture of the boiler flasks. At the same time, a decent amount of burning water and steam, under large pressure escaped into the room. What it can threaten - understandable.

How does it work

The safety valve for the water heater would correctly be called the valve system, as they are in the device two.

Safety valve device for boiler

They are located in a brass or nickel-plated case, which has the appearance of an inverted letter "T" (see photo). In the lower part of the case there is a check valve that prevents the outflow of water from the water heater when the pressure is reduced in the system. In perpendicular branch, there is another valve, which, when exceeding the pressure, allows you to produce part of the water through the fitting.

The mechanism of work is as follows:

• While the pressure in the boiler is less than that, which is in the water supply (when filling or with an open crane), the plate valve plate is pressed by the flow of water. As soon as the pressure is leveling, the spring presses the plate to the protrusions of the case, overlapping the flow of water.
• With the heating turned on, a gradual increase in the water temperature occurs, and the pressure is growing with it. While it does not exceed the limit, nothing happens.
• When the threshold level is reached, the pressure squeezes the spring of the safety valve, the output to the stacker. Some of the boiler water is boiled through the fitting. When the pressure drops to a normal spring, the passage is locked, water stops flush.

According to the principle of work it is clear that water from the fitting will constantly patch. This occurs when water is heated, with a decrease in pressure in the plumbing. If you periodically see water on the fitting, then everything works fine. But the merging fluid should be removed. For this, the tube of suitable diameter is put on the nozzle, be sure to fix it with a clamp. Normal working pressure boiler - from 6 bar to 10 bar. Without mechanical fastening The tube will be thrown into two accounts, so they select high-quality clamp, tighten well. Displays a tube to the nearest sewer drain.

Another point: The tube on the fitting is needed transparent and preferably reinforced (the so-called "Christmas tree"). Why reinforced persons - due to pressure, and transparent - to be able to control the operation of the device.

Types and varieties

If we are talking about conventional safety valves for the water heater, they look almost the same, only nuances differ. But it is these small details They are responsible for the convenience of operation.

Safety valve for a boiler with the possibility of forced pressure reset

In the photo above two safety valves with drilled levers. They are needed for periodic performance inspection. Flag lever raise up. He pulls behind the spring, freeing for the discharge of water. This check should be carried out about once a month. You can also empty the boiler tank - raise the checkbox and wait until everything is stealing.

The difference in the presented models is that the model in the photo on the left lever is fixed with a screw. This eliminates the possibility of a random discovery and full reset of water.

Two more differences are striking. This is an arrow on the body, denoting the direction of water movement, and the inscription showing the device is calculated for which pressure. It would seem insignificant details. But if you can figure it out with the direction of water movement (you can see in which direction the plate valve is deployed), then with a quantity it is more complicated. How to distinguish, for example, on 6 bar) or on 10 bar? Only checks. How will their sellers be distinguished? In no way. By boxes. And if you put not in that box? In general, without labeling on the case it is better not to take. These are usually the cheapest of the Chinese samples, but the price difference is not so great to stand risks.

Also pay attention to the form of the water reset. The model on the left is a long, a non-linear shape. It is quite easy to wear hose and lengths enough to install the clamp. The shape of the fitting at the model to the right is different - with an expansion by the end, but more importantly, the fitting is short. It is still possible to pull the hose on it, but the clamp is in question. Except to clip ...

On the next photo Safety valves without a pressure discharge flag. That which is left, in the upper part has a threaded lid. This is served model. If necessary, you can unscrew the cover, remove the blockage, scale and other contaminants.

Safety valves - serviced and no

The model on the right is the worst of the options. No designation, forced reset or maintenance. These are usually the cheapest available, but this is the only dignity.

All models above are suitable for water heaters of up to 50-60 liters. On boilers bigger size Other models go, many of which are built-in additional devices. Usually this ball crane and / or pressure gauge - to control pressure.

For boilers up to 200 liters

Fitting for resetting water here with a staff thread, so there will be no problems with the reliability of the attachment. Such devices already have a fairly high price, but also the quality and reliability of them are much higher.

With manometer and original

Not all by appearance Like these devices. For those who attaches aesthetics great importance Very even attractive devices are produced. Their price is true, comparable to the attendance of the water heater, but beautiful.

Is it possible to put other valves

Sometimes instead of a special safety valve for a boiler put a subversive, which is intended for emergency discharge of water on heating. Although they are similar to them, but the main mode of operation differs in the root. Subversion should only work in emergency situations. It is designed for a volley reset of a large volume of liquid. For permanent whipping of small portions of water, it does not fit. Accordingly, it will not work correctly.

Another case is to install only the check valve. It will not give a drain of water when the pressure is reduced in the water supply, but will not save from the boiler to increase the pressure. So this option is also not operational.

How to choose and install

Select the safety valve for the pressure water heater on which the unit is calculated. This figure is in the passport. Also on the choice affects the volume of the tank. Release devices with a response limit to 6, 7, 8, 10 bar. Basically, all the aggregates are calculated. So everything is simple here.

Installation is simple: linen palable or fum-tape is wound on the thread, after which the valve is screwed and the nozzle. Before the stop is twisted with your hands, then another one or two turns with keys. It is much more important to choose the right place to install it. When installing the water heater, this valve is installed directly on the pipe of the input of cold water.

Installation example

Next may still stand the check valve, which is also called shut-off. But this is already reinsurance - the same device is available in the safety, and even often after the water meter at the entrance. Installation scheme is shown below. This is one of the normal options.

Safety valve installation circuit for boiler

The diagram has a ball crane. It is necessary for emptying the tank before conservation for the winter (at dachas) or before dismantling for prevention and repair. But more often put it on a tee, which is screwed directly on the inlet nozzle of the water heater. A safety valve is screwed at the tee, and a ball crane is put in the side removal.

Installing the safety valve after a tee

Actually, these are all normal options.

Breakdowns, reasons, elimination

In principle, only two breakdowns have a safety valve for the water heater: water or often flows or does not flow at all.

First of all, it must be said that water booming during heating is the norm. This is how the system should work. Water and when the boiler is disconnected, if the pressure in cold water supply pipes will be higher than the valve response limit. For example, a valve for a 6 bar, and in the plumbing 7 bar. While the pressure does not fall, the water will be watered. If this situation is often repeated, the installation of the gearbox is needed, and it is best on the water to the apartment or to the house, but there are compact models of gearboxes that can be installed at the inlet to the boiler.

Boyler strapping with safety valve and gearbox

How to check the condition of the valve? If there is an emergency reset lever to do it simple. Pi off the boiler need to raise the lever several times, pulling out overpressure. After that, the drops stop and not resumes until heating begins.

If water continues to drain, it may have clogged the spring. If the model is served, the device is disassembled, it is cleaned, after which it is placed in place. If the model is not collapsible - it is only necessary to buy a new valve and deliver.

So the gearbox looks like - to stabilize the pressure on the boiler

Constantly dripping water is unpleasant and "beats" on the wallet, but not dangerous. It's much worse if you have never appeared water in the nozzle. The reason - the valve clogged or the output fitting was clogged. Check both options. It did not help - change the valve.

Water heaters are the most common devices for organizing hot water in a private house, sometimes they put them in high-rise buildings.

For installation on plumbing you will need some tools and additional materials. One of the mandatory parts of the valve is a safety valve for a water heater. As a rule, this protective element is supplied with the main appliance, but some budget models Can be sold without a valve.

Purpose of the fuse

You can highlight three main tasks that safety valve performs:

• ensures the safety of the operation of the water heater;
• winning beans from dry heating;
• if necessary, allows you to merge water from the water heater.

Safety valve put on accumulative water heaters (boilers). To better understand his principle of action, you need to know how it works and how the boiler works.

IN cumulative water heater Water is throughout the entire operation time. The TEN is turned on depending on the temperature to which the thermostat is adjusted.

Cold water enters the water heater through the nozzle from the bottom of the tank. Hot leaks out of the tank through the pipe, which is mounted in the bottom and installed inside, so that its top end almost reaches the top of the tank.

This allows you to select first upper layerwhich has more high temperatureAnd cold water in the meantime comes from below.

If there is no sufficient backpage in the highway, the water can be merged through the nozzle, which is designed to fill.

If there is no water, then the Tenny simply overheat and burn. Even if they do not have time to blown before the start of filling, water, hitting the hot metal, quickly boils, forms large quantity Couple that will create very high pressure. This pressure will be enough to destroy the device.

In order for the explosion does not happen, it is necessary to install the check valve for the water heater to be placed on the inlet pipe for cold water. In this case, with a decrease in the backpage in a cold pipeline, a liquid that prevents the overheating of the Tan will always remain in the container.

But one set of check valve is not enough. Moreover, if you only install it, the consequences may be even worse than in its absence.

Water incoming to the water heater will stop as soon as the pressure in the boiler becomes equal pressure in the cold pipeline. After the start of heating, the water will expand inside, and with closed cranes for the dismissal of hot water, it will simply have nowhere to go and the pressure will begin to increase. All this is fraught with an explosion, the consequences of which can be the most unpredictable and tragic.

Obviously, for normal operation, it is necessary to simply provide a triggered device that will produce an emergency reset of water when a specific threshold is reached (redundant value). It is implemented as a safety reset valve for a boiler.

Device and principle of operation

A device for preventing a serious accident looks surprisingly simply, and its size is small - placed on the palm. It is a small mechanism consisting of two perpendicularly located spring-loaded valves enclosed in one metal case. In essence, these are two cylinders (tubes), one of which is somewhat more than the other.

In the first tube of a larger diameter, as a rule, 1/2 inches having two threads at the ends, a check valve is installed, transmitting liquid only one way. The sash in it is located across the pipe and can navigate along it for several millimeters, opening or closing the passage.

Under the action of pressure directed towards the water heater, the sash opens, squeezing the spring. As soon as the pressure in the pipeline is aligned with the flap, the valve under the action of the spring is closed.

In the tube of a smaller diameter, located perpendicular to the first, the second valve is installed, the spring of which is adjusted to the opening at a certain pressure greater than the pressure for the first valve. This is a fuse protecting the explosion.

Thus, when the pressure and the check valve increases, it does not allow water to go into the feeding cold pipe, the second valve opens, and it is reset through the drain nozzle.

There may be special notches on the nozzle that contribute to the easy to wear a suitable diameter hose. This hose must be fixed by a clamp and output either in the sewer or in the container that will have to empty from time to time. This will have to do it infrequently, since the amount of extruded water during the operation of the water heater will be small.

Very often, a plastic flag is provided for the forced opening of the drilled device in the design. With it, you can check the health of the fuse. To do this, you just need to open it and make sure that the stroke of the piston is free, it is not clogged with rust and abalio, the spring effort is enough to return the valve into the closed state.

On the body of the safety valve, the arrow is very often applied, showing the direction of water movement to facilitate the installation. A labeling is usually applied to a small pipe, denoting the pressure in Pascals, at which the emergency valve is opening.

Installation

The safety valve for the water heater is mounted on a pipe that feeds cold water into the container. Due to the presence of a thread at the ends of the device, it is installed without welding and soldering, its installation is easy. Be sure to follow the direction of the arrow on the housing indicating the direct current of the cold water. To seal threads, it is necessary to use flax with packaging paste or FUM tape.

Between the introductory nozzle and the safety valve, it is recommended to install a crane or a plum valve. This is necessary because of the fact that if we often drain water using a safety valve, the coefficient of elasticity of the spring will decrease and the nominal opening pressure of the valve will change. Drain will be needed when repairing a boiler, for example, in case of replacement of the Tan or at the preservation of the house in winterWhen the liquid is drained from all systems to prevent its freezing and damage to pipes.

You need to put the crane on the side of the tee in such a way that it was impossible to overlap the pipe between the water heater and the safety valve, otherwise the latter will not work. In order for air to enter the water heater and there is no vacation vacuum vacuum, one of the hot cranes on the mixers can be opened.

Install a drain crane with a tee on a pipe with hot water It is impractical. It will be impossible to merge the water through it, and the extra detachable connections in the plumbing cannot be done.

If desired, hide the safety valve can be slightly lengthened the vertical cut of the pipe. But the distance from the tank to the valve should not exceed 2 m.

If water is dripping through the valve without visible causes (without heating), it may mean strong pressure in the system (above normal). In this case, it is recommended to install a gearbox on the water supply system and adjust the pressure. If the water in the tank is cold, pressure is not higher than 4 bar, and the valve continues to drip, then it is most likely the marriage and the device must be replaced.

Checking performance

After installing the safety valve, it is necessary to check its performance. To do this, you need to fill the container cold water. You need to fill out with an open crane so that air leaves the boiler. After water flows from a hot crane, you need to block both cranes.

From the safety valve, water should not drop, but when opening forced hand, it should go under pressure, approximately equal pressure in the plumbing. It is not necessary to measure it, since it is easy to determine visually.

After the start of heating, it takes no time for hot water cranes. This will create increased pressure in the tank. In the tube of plum or simply from the valve hole (in the absence of a tube), droplets will appear, since the liquid from the tank will begin to be extended. This means that the safety valve is in a working, good condition and water heater can be safely used.

The need for choosing occurs in the event of a guard breakdown, flowing or loss for some reason. If you need to buy a new safety valve, then pay attention to its trigger pressure. It is necessary to compare with the pressure of the boiler, which is indicated in the passport. Another indicator is a setting step. It usually is 0.5 bar. You can choose a safety device with a slightly smaller pressure than the boiler, but in no case with great.

You can not confuse the valve for a boiler with a similar device for heating, since the latter is designed for lower pressure. You can also install the check valve instead of the safety, as it will not perform its functions and the heater can explode.

It is advisable to pay attention to the case material and choose brass, because it is more plastic, it does not crack, longer serves, although more expensive.

Safety valve for water heater: device and work principle

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Now we will understand why a safety valve in a water heater and what the principle of its work is needed. We also learn how to choose the right valve and buy, then install (mounting) and what to do if it flows.

Check the price and buy heating equipment and related products you can have. Write, call and come to one of the shops in your city. Delivery throughout the Russian Federation and CIS countries.

By installing a cumulative boiler, it is necessary to take care of the safety of operation and purchase a safety valve that protects the device from pressure jumps, and, in the event of an emergency turning off the water, does not allow it to flow out of the tank. What is a safety valve? Why does this item need a water heater? How to choose and install it? You will find answers to these questions in this article.

Thermex Water Heater Safety Valve

What is it needed for

When water is heated, it expands and increases in volume, and the pressure, respectively, increases. If it exceeds the strength of the boiler, he simply explode. In order not to have happened, the safety valve is installed. It does not allow pressure inside the heater rise above the norm.

In addition to protection against a possible accident, the valve performs the following functions:

• it does not allow warm water to return from the tank to the water supply;
• protects from;
• if the water failure occurs, it will not be necessary to reinstate the tank with water.

If you think your device will protect the thermostat, then you are mistaken. They monitor the degree of water heating and do not allow it to throw. However, like any other device, they may fail, with the result, the consequences will be irreversible. Therefore, you should not risk.

How it works and works

Speaking about the safety valve for the water heater, it is better to use the phrase "valve system", because There are two in the device.

Boiler Safety Valve Device

They are in a brass or nickel-plated case. At the bottom of the housing is set, which at the time of a decrease in the pressure in the system, prevents the outflow of water from the water heater. In the perpendicular branch there is a second valve, due to which at the time of increasing pressure, part of the water is produced through the nozzle.

How the safety valve works

Principle of operation:

1. While the pressure is normal, the valve is closed and does not allow the fluid to flow outward, as soon as it becomes equal to pressure in the water supply system, the spring presses the plate to the protrusions of the body and overlaps the water flow.
2. When the heating is turned on, the water temperature gradually increases, and the pressure is also rising with it.
3. As soon as the pressure exceeds the spring strength, the output to the fitting, through which the excess water is merged. When the pressure is normalized, the spring closes the passage and water flow pauses.

Based on the principle of functioning, it becomes clear that water from the fitting will constantly drop. To remove the merging fluid, the tube of the corresponding diameter should be put on the pipe and consolidate it with a clamp. The pressure required for the normal operation of the water heater is 6-10 bar.

The tube on the fitting should be transparent so that you can control the process of functioning the device.

Views

Conventional safety valves are externally similar and differ only small detailsBut they are responsible for practicality of use.

The figure shows two safety valves with sloping levers. They allow you to check (need to be carried out monthly) device performance.

Safety valves for boiler with the possibility of compulsory pressure discharge

The difference between the two modifications represented is that the sample on the photo on the left lever is attached using a screw, which eliminates the possibility of a random opening or full reset of water.

Another inconsistency: the shape of the fitting. The sample on the left the nozzle is oblong, nonlinear form. It is easy to wear hose and length enough to install a clamp. But the fitting at the right model is short, with an expansion by the end. On such an instance it will be very difficult to pull the clamp.

The following figure shows a reset valve without a forced pressure discharge flag. The model on the left in the upper part has a threaded lid. If necessary, it can be unscrewed and clean from all sorts of clogs.

Safety valve without the possibility of compulsory pressure discharge

Sample right - is the worst of the options, because It can not be served. The only plus of similar models is low price.

The above-described models are suitable for water heaters, the volume of which is 50-60 liters. For boilers more suitable other models with built-in additional devices: ball valve or manometerwhich control the pressure.

Safety valve for large capacitance boilers

In such devices, the fitting for discharge of water with standard carvings, so the fastening is durable. Such models are distinguished by high quality and reliability, therefore it is not suiced.

How to choose

By choosing a safety valve for a water heater, pay attention to such components:

• the temperature on which it is designed;
• threaded compounds (usually half an inch);
• pressure;
• is it provided in the design handle for forced plum.

Purchasing a reset valve, be sure to specify its pressure, because This is one of the most important indicators. If you buy a device with a smaller value - you will constantly have to deal with the problem of water flow. If with a greater thing it can be useless and will not protect the tank from the explosion.

Installation

Before starting the installation of the safety valve for the water heater, be sure to drain the water from the device and disconnect it.

The location of the device is the entrance of cold water to the boiler. The installation process is fairly simple: the key to 3-4 turns using seals, the second thread end valve is connected to the plumbing cold system.

Be sure to check the direction of the incoming water - on the valve body it is marked with an arrow.

In case the plumbing pressure constantly jumps and often exceeds the norm, then you must first install.

From time to time water leaks from the valve. This is an absolutely normal phenomenon that talks about the normal operation of the boiler, but not everyone likes it. In this case, the drainage nozzle must be connected to sewer system By means of a flexible transparent hose that allows you to control the performance of the device.

Installed Safety Valve for Water Heater

Some ordinary people do not want the valve to be in sight and place it away from the water heater. Such manipulations are fully applicable, but when complying with two important conditions:

• at the distance between the valve and the input to the boiler you can not mount the locking devices;
• the long vertical section of the water supply in itself will increase the pressure on the valve and can occur at all without the necessary leakage.

The distance between the valve and the boiler should be no more than 2 m.

Why dripping water from the crane

Dripping water signals a malfunction of the part, but even if the water drips under high pressure, you should not panic in advance. This may be provoked by several reasons:

• the rigidity of the spring is poorly configured;
• pressure in the pipeline exceeds the norm.

In the first case, the malfunction could arise due to the fact that the installation was carried out non-professionals. Many check valves are manufactured taking into account the ability to change the factory springs stiffery settings. Customize rigidity should specialist. If the settings did not change, most likely the spring weakened, in which case it is advisable to replace the new one.

If the reason for the breakdown lies in high pressure in the pipeline, then before installing the safety valve, it is recommended to install a reduction.

When expanding in the pipeline, you can install a reduction valve at the entrance to the apartment, so you will protect all the devices in your home.

To purchase a safety valve, you will spend quite a bit of money, and get safety and long term Water heater services.

Everything famous manufacturers Water heating I. heating equipment Very seriously belong to their reputation in the market and in the consumer environment, so they do everything so that accidents and accidents are excluded when using their products. All boilers, warm water under pressure of more than 1 bar, are tested on special stands and installations. But even in this case, the manufacturers are reminded in instructions that the installation valve for boiler must be installed in the instructions. Only so you can provide the necessary level of security.

Safety valve, device features and installation

By one name, it can be easily impact that the main function of the safety valve is the pressure control inside the boiler. In fact in the design standard device There are two valves - reverse and safety, rice.

To understand how to work with the design, you need to deal with the boiler safety valve device:

• Both control valve elements are assembled in a T-shaped housing of nickel, iron-α or brass alloy. In the vertical part of the case, the check valve is installed, in the horizontal - safety;
• On the fuse rod, the control checkbox is installed. of blue color, with the help of which it is forcibly dumping a part of water from a boiler;
• Control plates or petals of both valves in working condition must be pressed to the support surface or "saddle";
• From both ends on the input and outlet nozzle of the body, a pipe inch thread is made, most often its size on the safety valve for a ½ inches boiler. For a capacity of 100-200 liters, a boiler for ¾ inches is usually provided for a capacitance valve.

For your information! Despite the fact that the installation of both valve elements is made in one case, they work and break completely differently.

As an example of a high quality device, you can recall the valve safety for the boiler Gorenje, a photo.

Brass body and casting high pressure Provide long term operation even when installing on cheap Chinese boilers. The only drawback is a high price, at least $ 15 per piece. But if we consider that the installation of the valve fuse will avoid major trouble, it does not make sense to save on safety.

Protecting the safety valve

It is worth noting that both valve elements, despite the fact that their installation is made in one case, work completely independently of each other. The valve fuse on the principle of operation is largely similar automatic valve boiler. As soon as the pressure inside the capacitance increases above the limit 6 bar, the shut-off plate under the water pressure moves, compresses the spring and frees drainer. Part of the water goes into the sewer until the pressure is levels up to the norm.

In addition, the safety valve for a boiler with a shutter handle allows you to clean the container from accumulating salts and sediment. For this time, in a couple of weeks, you need to install the handle or flag into the horizontal position. In some models, you will need to click on the checkbox and hold it for a few minutes. Water through the drain washes particles and precipitate, accumulated in the valve mechanism.

Tip! With the valve fuse, you can completely drain the water from the boiler for repair or maintenance.

Check valve is designed to prevent flow warm water From the boiler back to the linerwater highway. As water spent in the heating capacity, the locking plate under pressure in the highway is lifted and frees the flowing part to fill the boiler.

If the pressure in the plumbing decreases sharply or increases, the valve plate blocks the leakage of hot water back to the main or extinguishes the hydraulic blow using a spring. Especially relevant installation of a safety valve for a boiler on cheap Chinese products, in which there are no thermostats, no thermal electric relays.

Without installing the reverse and safety valve, the Chinese boiler can easily turn into a source of danger - to rip the owners with boiling water or pour the apartment with hot water. Masters - Practices often recognize that it makes sense to install a safety valve even for a boiler indirect heatingwhere the default should not be similar problems. For example, repair work On water supply systems, it is almost always accompanied by hydraulic groans and pressure surges, in this case the boiler is subjected to hard test, regardless of its device.

Features of installation and adjustment of valve devices

Often when buying and installing a boiler under hot water The hosts ignore the recommendations of the manufacturers and refuse to install a safety device, motivating its solution by the fact that the valve interferes with the operation of the water heater.

Claims for safety valve

In fact, the abnormal operation of the valve device can have quite specific reasons:

• Low quality product;
• Abnormally high pressure in the water supply;
• Incorrect installation and adjustment of the valve mechanism.

As a rule, high water pressure is typical for the first floors. apartment houses. When professional installation, the wizard is always interested in water pressure. Perform the installation of the boiler and connect it to water supply with water at 5-6 bar. Therefore, the pressure is trying to adjust using an introductory valve or recommend the installation of a downward gearbox, which will immediately decide half of the problems.

The first and third cases are much more complicated and more dangerous than high pressure. As a rule, manufacturers of boilers famous brands Complete their products very good, high-quality safety valves. When buying, few people check exactly which additional components and materials are attached to the boiler, so branded devices during pre-sale preparation Replaced with the corresponding size, but cheaper. Therefore, when buying or installing, it is worth checking the operation of the device to check the device, so that the safety valve flows on the boiler is not surprised.

High quality valve can be determined by the following features:

• The housing is made of brass alloy molding, possibly with nickel coating. Cheaper alloys of iron-aluminum or copper-aluminum will be easier, with thinner walls of the case;
• Plastic valve plates when pressed for a rod, the inner walls of the housing are tight or subdined in the extreme state;
• The mechanism inside the valve does not provide reliable overlap of the duct even when weak pressures. To check, you can clamp the valve valve with your finger and pour into it. If there is no reliable location, then the safety valve is better replaced. In this case, if the boiler drips from the safety valve, it does not mean that the device is faulty. Most likely, the locking plate is clogged with a sediment, but the mechanism itself is in working condition and does not require additional adjustment.

If there is no water at all, or the water stream is poured with a stream, this indicates the jamming of the valve plate in one of the extremes. You will need to dismantle, clean and adjust the instrument.

But even if the boiler and the safety valve are chosen correctly and of the right qualityThe risk of incorrect installation and system adjustment by the masters remains. For example, there are often cases when the boiler was hung on hot water. So as not to be in a similar situation, it is enough to have at least general viewHow the installation and adjustment of the safety valve is performed.

Diagram of installation of the device on a boiler

Claims K. proper installation The valve device is a bit:

• The safety valve is always installed in the rupture of the cold water highway between the locking valve and input to the boiler, there should be no other devices in this gap;
• The maximum distance from the input nozzle on the boiler to the valve fuse is 180-220 cm;
• For most models, the vertical installation of the device is provided, while water must come up upwards. The direction of movement of the water flow is indicated by the arrow on the housing.

The drain fitting on the safety valve must be connected with a transparent polychlorvinyl tube with the sewer highway. The transparent tube is very convenient in use - it can be clearly visible how the safety valve works.

Not to drill or not cut sewer pipe, you can use a special tee for washing machineslike video

Before installing the case, the body is neatly blocked by air to avoid a loose fit of the plate to the saddle due to the accidentally caught inside the garbage or trimming ribbon. The valve assembly is performed according to the traditional scheme - the threads are wrapped with fump in the direction of spinning the cape nut and twisted with the introduction or submarine hoses.

Before starting the boiler, the connection to the cold is pressed under the working pressure. If during 5-7 minutes, water droplets did not appear at the joints, it means that the installation is performed correctly.

After filling the boiler, it is necessary to check the operation of the safety and check valve. The check is carried out "on the cold". The correct adjustment of the emergency water discharge can be checked by the flag. With a slight press, approximately 1/5 from the full turn, the first drops should appear, and with full water runs the stream. This means that factory adjustments are made correctly.

The reverse valve operation can be checked as follows. It is necessary to finally fill the boiler to the end, after which it is necessary to block the shut-off valve at the inlet of the container and the central input. When the crane is opened in the bathroom and in the kitchen, water from pipes will run the first couple of minutes. If the flow has not stopped and after 5 minutes, it means that the "return" does not hold and requires adjustment. Indirectly, the care of the boiler water can be monitored by falling pressure on the pressure gauge.

You can regulate directly only the collapsible valve models. For this, special thin metal washers with a thickness of 0.2-0.3 mm are used. They are placed under the planned springs, and thus experienced the elasticity of the details. Uncine valves are replaced with new ones.

Conclusion

The life of a qualitative safety valve is at least 10 years, provided that regular purging and purification from the magnesium-calcium sediment. Once a five or six years, the valve needs to be dismantled and rinsed from accumulated rust, garbage and salts with a special fluid. Special attention It is necessary to pay a seal on the stock of the checkbox. So that the rubber does not spend, every six months need to be processed working surface Silicone lubricant.