Where the valve is put on the boiler. Reverse valve for water heater: Detailed description Why the check valve is needed. Safety valve, device features and installation

All well-known producers of water heating and 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 obligatory The installation of a safety valve for a boiler must be performed. Only so possible to provide necessary level 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 installed check valve, 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 case, pipe inch thread, most often its size on the safety valve for the 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 the device high Quality You can recall the valve safety for the boiler Gorenje, photo.

Brass housing and high pressure casting 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 from each other. The valve fuse on the principle of operation is largely similar to the automatic boiler valve. As soon as the pressure inside the capacitance increases above the limit 6 bar, the shut-off plate under the pressure of the water moves, compresses the spring and frees the drain hole. 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.

The check valve is designed to prevent the flow of warm water from the boiler back to the liner of the water 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 hot water back to the highway or extinguishes a hydraulic blow with 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 installation of 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 apartment 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 for hot water, the hosts ignore the recommendations of the manufacturers and refuse to install 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;
Anomal high pressure in plumbing;
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 which additional components and materials are attached to the boiler, so branded devices during pre-sale preparation are replaced by 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 pressing rod inner walls Cases or subdined in extreme state;
The mechanism inside the valve does not provide a reliable overlap of the duct even at 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 the right quality, the 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. In order not to be in a similar situation, it is enough to have at least a general idea how the installation and adjustment of the safety valve is installed.

Diagram of installation of the device on a boiler

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

Safety valve It is always installed in the gap of the cold water highway between the locking valve and input to the boiler, there should be no other devices in this interval;
The maximum distance from the input nozzle on the boiler to the valve fuse is 180-220 cm;
For most models provided vertical installation Devices, while water should 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 0.2-0.3 mm thick. They are led under the requested springs, and thereby experienced way Pick up 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 should be paid to the 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.

When operating anyone thermal equipment It is very important to comply with all recommended security measures. This applies not only to large installations that are used in construction or production, but also compact instruments, such as household water heaters.

If you ignore the safety rules of consequences can be extremely serious - after all we are talking Not only about your life, but also about the lives of people around you. Safety valve is very meaning thing In equipping a home water heater, which, unfortunately, many forget. In this article we will tell you about what is needed by this device, as it works, as well as how to operate it correctly.

Purpose

To deal with the purpose of the safety valve, to begin with, remember the elementary things from the school courses of physics. It is known that water has a property to increase in volume when heated. If you heat water to 80 degrees (approximate maximum hot water temperature from under the tap), then its volume will increase by 2 or 3% - it depends on which temperature was at the beginning of heating.

Since the container in which the water is heated in the boiler, sealed, then the pressure inside this container inevitably increases with severe heating. The result of an uncontrolled pressure growth may be an explosion of an instrument. It is here that the safety valve will come to the rescue. It performs the following functions:

does not allow hot water to get back to water pipes;
normalizes the pressure inside the water heater, reducing the likelihood of the hydroedar;
gets rid of excess water, throwing it out, as soon as the normal pressure and temperature indicators occurs;
it makes it possible to safely drain water from a boiler for maintenance.

If you have a question, whether the safety valve is installed on the boiler, we bring to your attention the video Gennady soft, in which he explains why and when it is necessary to put the valve and how it is arranged.

Device and principle of operation

Despite the rather wide functionality, the safety valve has a very simple device: its main elements are two cylinders - large and small.

Big cylinder It is a kind of "check valve". Inside it has a sash, which is called "Cabinel valve". This valve acts a small spring. At both ends of the large cylinder, threaded parts are fixed, which are needed to connect the safety valve with other elements of the boiler.
Little cylinder Fastened perpendicular to large. Both ends are plugged with plugs, and the drainage tube is on the case. Inside the small cylinder, there is also a check valve that works in the opposite direction.

How does the safety valve functions?The growth of water pressure inside the boiler drives the springs of the check valve. It opens, allowing water to fill the tank. As soon as the water reaches the desired level, the pressure inside the water heater increases, and the check valve slams. As water spent in the tank, its reserves will be replenished automatically.

The check valve inside the small cylinder is designed for a higher pressure. As soon as this indicator becomes critical, drives the spring, opening the valve. In this way, excess water will be discharged.

Views

There are several different versions of check valves for boilers. They differ by certain key parameters. For example, by the installation method, the check valves are divided into:

non-reflauded;
receptions;
steel;
ball.

Depending on the principle of operation, the following varieties of check valves can be distinguished:

straight;
indirect
designed for two positions;
proportional.

Finally, there are several more types of check valves for boilers at the height of the position of the constipation:

full-dimensional;
mid-lining;
littered.

With a handle descent

One of the most common options for check valves that are equipped with water heaters is a valve with a shutter handle. Tell brief about his device and the principle of action.

In the design of the check valve with the shutter handle, there are the following elements: housing, water reset fitting, forced pressure reset, safety valve spring and springs of the check valve.

Under the influence of water pressure, the springs of the check valve occurs, with the result that the plate valve turns and opens access to the tank. After it is absorbed enough water, the check valve returns to its original position.

The descent handle is needed in order to enable forced pressure from the system if necessary. As soon as the pressure exceeds the permissible maximum, the safety valve is activated through which the excess water is discharged, so that the pressure is normalized.

For boiler indirect heating

Many apartments have indirect type water heaters. Indirect heating occurs not in the boiler itself, but in a different device, most often - in the heating boiler. So work indirect boiler And the boiler is closely interconnected. For this type of water heaters, you need to select a suitable safety valve.

All the characteristics we need are listed in the technical passport of the device, so before purchase, be sure to learn this document. It is important to know the permissible working pressure of the device - it is necessary to navigate on it, and not pressure in the plumbing pipes.

Is it possible to replace the safety valve?

Users of household water heaters often ask the question: "Is it possible to install the opposite instead of the safety valve?". Technically, this is possible, but it is not necessary to do so. If you make a similar replacement, the boiler turn into balloonwhich at any time can burst.

For example, when water heated to 150 degrees, the boiler will calmly withstand rapidly grown pressure. However, if at this moment you open a crane with hot water, the pressure inside the water reservoir will start quickly. Next, the boiling point will drop to 100 degrees, but it will not have time to cool so quickly. As a result, the water instantly boils, a huge amount of steam will be highlighted, the pressure will jump up and a rather strong explosion will occur.

When choosing a safety valve for a domestic water heater, use the recommendations that have made specialists for you.

Among the diversity of structures, the spring mechanism is most reliable, so it is able to resist the water pressure well.
No need to forget about such a factor as bandwidth valve. We advise you to give preference to a low or complete lifting device.

Consider the device tap and sewage systems in your home. If the excess fluid is merged into the atmosphere, choose an open safety valve, and if a specially equipped pipeline is closed.
Choosing a safety valve, you should remember the maximum allowable pressure in the water heater system. If it is higher than indicated in the instrument's technical support, the valve will not function normally.

Check for service

At home, it is possible to find out quite easily, whether the safety valve installed on the water heater is working. To do this, you only need to set the temperature controller to the maximum value, and open the crane with hot water. If, after the water in the boiler is heated to the desired temperature, the excess fluid will begin to flow through the safety valve, it means that it is quite suitable for operation. If water via the valve does not follow, most likely, it is faulty.

Despite the permanent warnings of customers of electric heating equipment that such devices should be installed strictly according to the instructions, without ignoring all components, it is still quite a frequent case that the safety valve for the boiler is not installed at all.

Safety valve device

Safety device consists of two parts:

Check valve

Subversive valve

They both are placed under one case and each performs its function. The check valve does not give excess water (which appears as a result of water heating) to flow back to the system. The second valve, it is subversive, it works only if the pressure threshold is exceeded, it is usually 7-8 bar.

Already on this information, it is clear that in the event of an emergency or a sharp increase in pressure, subversive valve Determines excess water and will not give damage the electric heater. It also has a lever for forced water descent, this is necessary when repaired or dismantling a boiler.

Despite the fact that in each water heater, thermostats are installed that regulate the temperature, they can break, so the system in which there is a working protective device is safe and will serve you for many years.

There are also situations with the lack of water in the system, the serviceable work of the check valve is very important here, which is installed on the water heater, because all the water from the water heater will be released, and with a faulty thermostat, the empty boiler is very quickly heated and the tanes inside it will blown.

Flowing water from valve

Flowing water is the usual case for a prevention device, it indicates a good job. But if water flows too fast or constantly, it may indicate one of these problems:

The rigidity of the spring is incorrectly adjusted;

Too high pressure in the system;

If you have no relation to the last problem, the rigidity of the spring can be incorrectly adjusted only in case of thoughtless handling of the regulators.

Racing in the system can be eliminated using one more valve - reduction, it is installed before the safety and provides a stable pressure on the water heater.

Lack of water dripping from a protective valve

If, after installing the boiler, it did not work at once, even with maximum heating, it is worth thinking about the health of the prevention device. It is not necessary to change it immediately, it is possible that the excess water is dried through a faulty mixer, or damage in the tubes.

Sometimes the boiler is not heated to high temperatures, not higher than 40 degrees. In this case, the safety valve for the water heater does not work due to insufficient increase in pressure inside the boiler, this is normal.

Choosing the right model

Usually in a set with a boiler there is a prevention device of the desired model. But if it is not there, it is defective either you replace it after some time of operation of the water heater, you will have to choose yourself.

The main parameter after the thread (the size is selected very easily, it is usually 1/2 inches) is a working pressure. From proper selection This parameter will depend correctly and safe work Boiler. Superior pressure It is indicated in the instruction manual, which comes complete with each water heater.

Problems that may occur as the result of the wrong selection of the protective device are two:

Constant to flow from the device due to the choice of a smaller operating pressure indicator than necessary;

The device will not work at all if a value is selected more than you need, this safety valve will not save in case of an emergency;

Proper installation of a prevention device

1. To begin with, turn off the boiler from the mains and drain the water from it.

2. Install the device to the supply of cold water, at the entrance to the heater. In the usual way I pack it and connect cold water to the second side.

On the valve body there is an arrow that indicates the direction of water, when installing it should point to the boiler.

3. Connect the nozzle that comes from the subversive valve with sewage. Sometimes it is bought transparent to observe the health of the protective valve.

4. After connecting the boiler completely, it is worth checking it. To do this, fill the tank, prematurely opening the faucet for the air outlet.

5. Then after a set of water, closed the tap and turn on the boiler.

6. We observe all the joints for the presence of water and look at the performance of the safety valve. If it was found to flow, the incoming and outgoing cranes are closed, and the desired area is rebuilt.

Is it possible to replace the protective valve back?

No case, the prevention device has a check valve inside itself, but it is not one there, you can not miss the subversive valve. If the check valve does not give water to leak into the system and, roughly speaking, saves your money, then the subruptive does not allow the boiler to increase the pressure inside to the critical.

The boiler, which, instead of the safety valve, is installed in the bomb of slow motion. A huge pressure inside the water heater will not destroy the boiler until you open the faucet. When opening the crane inside the boiler, the pressure decreases, but the water, heated to the temperature higher than 100 degrees, immediately everything turns into pairs, destroys the walls of the boiler and breaks out.

This is a rather strong explosion, which is accompanied not only by fragments of the case, but also hot steam and water. Take care not only yourself, but also people who surround you.

conclusions

Follow the instruction manual, even such a small look device makes your life safer. A prevention device is a very important element and exploit a boiler without it is strictly prohibited. Always follow the operation of the installed protective device, water flows from it when necessary or not. All these factors save your time, money and health.

The owners who have installed a cumulative water heater in their home often have questions about the operation of its safety valve. To flow water from this device is the norm or breakage? And if the turn of water should take place, then in what quantities and how often? The device and principle of operation of the safety valve for the boiler we have already considered. Now we will tell you how to determine the malfunction of this device and how to solve the problem of its leakage.

As you already know, the safety valve for the water heater serves to relieve excess pressure from the tank, which appears during the heating of water. At the same time, the flow can occur in several cases, each of which will look at more.

Leak when the boiler is turned off

We simulate the following situation: the water heater is disconnected from the network, the water supply from the water supply is included (a valve on the pressure line is open). Of drainage hole Boiler flows water. Cause this phenomenon can be like a malfunction of the safety valve and high blood pressure in the highway.

To find the cause of the leakage of the safety valve you need to know the water pressure in the water supply

To determine the culprit, the leakage should be measured with cold water pressure in the water supply. The fact is that if the trunk pressure will exceed the accepted SNiP, the valve will open, and will perform its functions on the discharge of excess water into the sewer. Most water heaters safety valves that manufacturers are completing their products are set to pressure from 6 to 8 atmospheres. The maximum pressure that is allowed to be lowered in the trunk water lines, there should be no more than 6 atmospheres. In fact, it often happens that the actual indicators exceed the normative on 1 - 2 atmosphere. Naturally, the safety mechanism will work.

The second cause of leaks may be the valve itself. Wearing his plate or saddle, weakening the spring - these are the factors that can lead to a leakage. Often, so faults are subject to cheap Chinese products.

You can not be discharged from the scales and the likelihood of a scope of the shut-off mechanism of the particles of scale or garbage, which can happen in emergency discharge pressure or after draining water from a boiler during preventive or repair work.

In the event of a safety valve, in no case delete this part from the water supply system to the water heater. Remember that the operation of the accumulative water heater without a safety valve is prohibited and can lead to its explosion.

Video: What makes the work of a boiler without a safety valve

Valve leakage during the water heater

If the water heater is included in the network and heat the water for a long time without a substantial water intake, then the wines of constant leakage is most likely a faulty safety valve. The fact is that with the primary heating of cold water, its volume in the boiler will increase by about 2-3%. Here is this excess fluid and will be reset from the tank. In the future, the boiler simply supports the temperature of the hot water, so no leakage should be, so the reason should be searched either in the breakdown or in the safety valve.

A completely different picture should be observed with an increased watersplace, for example, during the taking of the shower: a constantly outgoing hot liquid will continuously replace cold water. But when it is heated and the excessive excessive appears above. Therefore, the flow of a certain amount of water from the drainage opening in this case is quite logical.

Safety valve device for water heater

And the third option - with a small, stretched in time watersubor. For example, washing dishes or cooking. With this consumption of hot water of constant leaks from drainage tube should not be, but periodic leakage of liquid droplets just will indicate proper work Water heater.

How to eliminate malfunction

If the cause of the leakage is a faulty valve, it is replaced by a good part configured to the same working pressure. When replacing, and better, even during the installation of the water heater, try not to use cheap Chinese products. Remember that your family's safety directly depends on the valve. Good Italian safety valves with the same inappropriate design, though standing several times more expensive, but also bought once. As practice shows, there are no problems later with them. To drainage the device, attach a flexible transparent hose. This will help visually evaluate the work of the part. The end of the hose is output into the sewer or suitable container.

Products from well-known manufacturers are reliable and durable

To remove the valve for replacement or cleaning, you will need plumbing and adjustable keys. Work is performed in this order:

Disconnect the boiler from the network;
Overlap the crane of the supply of cold water to the water heater;
Cranes of hot water waters are open and completely drained it from the tank;
Press the lever on the safety valve and remove the residues of the liquid from the tank;
Disconnect the pipe with cold water from the safety valve;
Remove the valve.

After cleaning or replacing, the part is installed in the reverse order.

Important note: Include a water heater in the network only after full filling of its tank with water, otherwise the tubular electric heater may fail.

In the event that the input pressure of your water supply exceeds the nominal pressure on which the accumulative water heater is calculated (it can be found from technical passport On the device), at the entrance of water in the apartment is set a pressure reducer.

Installing the gearbox at the inlet of the water heater will not only allow the water pressure to lower, but also prevents the occurrence of hydrowards, adversely affecting the coating of the inner tank of the boiler.

Before the gearbox, a filter is mounted for pre-purification of water, and its installation is performed in strict accordance with the direction of fluid flow. Approximately half of the pressure gearboxes have a pressure gauge in their design, which greatly facilitates their setting and control of the parameters of the water supply system.

Today I will tell you how to choose a safety valve for the water heater.
What a valve is needed and how it is already described in the article "Safety Valve for Boiler". Now we will determine what, first of all, it is necessary to pay attention to when buying a new valve.
The most important question is the price. In the markets and in stores, the valves are sold at a price of 4-5 dollars apiece. We are talking about the simplest valves that most household boilers are completed.
What you need to pay attention to. Consider several distributed valve types.

The first model of the valve. Ideal in all respects. The arrow indicates the direction of water flow. Indicated the pressure of the response. The valve handle is fixed with the screw (a kind of protection against "fool"). Pay special attention to the spout to connect the plum tube. Any hose can be tightly died and fix the clamp.

Next model. The direction of water is not specified. The pressure is not specified. The hose can be shedding, but it is impossible to fix it. Pleases the presence of a handle for testing the valve. For large quantities There are one big plus for minuses of this type of valves - they are quite successful.

And this is a safety valve that can be serviced. That is, once a year clean the boiler, at the same time, the valve is dismantled, cleaned. In fact, the valve serves as much as a boiler.

Well, the last aggregate. Cheap and stupid. No maintenance and diagnostics. All your fear and risk. Does not drip from the valve? So I break your head, whether the spring is zakisla, or what is the reason. But still work. I change such valves with each cleaning of the water heater.
By the way, the last type of valves is most often faked. Therefore, whatever you caress for a fake from the silumin, at least catch its weight on the vrosion.
What else can you advise? Here is very important! Valves with a handle must be periodically, about once a month, diagnose. Just open a handle for flushing the valve several times. Just do not forget to cover the water at the water heater entrance.