Safety discharge pressure valve - buy by catalog, price. What is the water heater for a water heater? Installation of the safety valve on the water heater

From the correct strapping of the electrical water heater of the accumulative type (boiler), not only the life of the equipment, but also the safety of tenants depends. 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.

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.

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 pipe is put on the pipe suitable diameter, 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 a we are talking On conventional safety valves for the water heater, they look almost the same, only nuances differ. But it is these small details that are responsible for the convenience and safety of operation.

In the photo above two safety valves with drilled levers. They are needed for periodic check performance. 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.

Design features

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 opportunity random opening 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 marking on the body, the valve 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.

Safety valves - serviced and no

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.

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.

For large boilers

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

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

Not everyone in appearance like these devices. For those who are aesthetics attached great importance to very attractive devices. 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. The subversive 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: wound on the thread linen pala or fum-tape, 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. With this valve is installed directly on the pipe of the input of cold water.

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.

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.

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.

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.

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. Immediately change it is not necessary excess water Powels 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 on the correct and safe work of the 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.

When arranging an alternative hot water system, a safety valve is installed for a water heater, the principle of operation of which is very well known to those skilled in the art.

If necessary, install water-heating equipment yourself, it is necessary to know not only design features, but also the basic rules for the installation of such reinforcement.

Cumulative boilers are popular household devicesintended for water heating.

Cumulative type water treatment may vary constructive featuresBut the predominant, most of these devices are represented by metal tanks for water with installed heating elements in the form of Tan.

Water heating equipment is designed in such a way that the same amount of water is constantly inside the tank, the volume of which is replenished as needed.

In the process of heating, a natural expansion of water occurs and an increase in the initial volume of the liquid is approximately 2.5-3.0%. Thus, the amount of water in a reservoir designed for 100 liters, as a result of heating to 80 ° C increases about three liters.

Safety check valve for a boiler on a thread 1/2 "without flag

The absence of severe compression of the fluid can provoke the tank of the reservoir walls and the formation of the flows of different degrees of severity.

Among other things, the reason for the output of the water-heating device can be too high pressure in the plumbing line. If the plumbing network is characterized by a pressure level above 6 atm., It is necessary to install a special gearbox.

In the absence of hot water consumption and while maintaining the level of heating, problems presented with overpressure may occur, which often becomes caused by water-heating equipment.

How does the valve perform the function?

Why do you need a safety valve for the water heater and how does it work? Many consumers independently upgrade water equipment, removing the check valve.

Of course, in a sufficiently high and stable pressure inside plumbing systemThis option will be able to function correctly for some time, but the first failure causes the output of the device from the working state.

Valve on water

For example, with insufficient pressure inside the pipeline, the process of natural displacement occurs hot water Cold fluid with its move back, in the plumbing system. The result becomes larging the heating elements and their inevitable, sufficiently rapid overheating.

Dropped heating elements It is not possible to completely disrupt the safety of the exploitation of the water-field device, and here a strongly spent tane cause a sharp rise in pressure in the plumbing system.

In this case, water entering the hot heater causes its evaporation, a lightning pressure growth and a guaranteed strong rupture of the water heater reservoir, with a release of boiling water and a couple outward. To prevent similar problems, a safety valve device is used.

Safety valve device for boiler

It should be remembered that safety device It prevents the supply of water from the heater to the water supply system, smoothes the likely pressure fluctuations and prevents the formation of powerful hydraulic shocks, contributes to the discharge of excessive water through the fitting and ensures the safety of the operation of hot water equipment.

Valve design

The device of the safety valve for the water heater or the so-called "security group", depending on the design, may have some features.

The following devices are available:

intended for water-heating equipment with a volume of not more than 100 liters;
serving boilers volume in the range of 100-200 l;
built-in water heaters with tank capacity 200 l or more.

The features of the valve devices of the first category are the available cost and non-separable type of housing. They differ for a short time operation, but may well be replaced quite often. It is such devices that are most often equipped with budget models of water heaters.

The second type of "security group" is complemented by a ball crane and special nozzle To connect to the sewer system. Most often, such devices are performed in the collapsible case, which makes it possible to replace individual faulty elements.

The most expensive and most modern valve devices include "security groups", which are used in water-heating equipment with an increased capacity of the tank. Such devices are characterized by the complement of standard equipment, in the form of a pressure gauge, a pressure gearbox, a mesh filter and a special sump.

In the process of installing the water heater, it is unacceptable to replace the safety valve device with a subversive or emergency valve intended for installation in heating systems.

Why do you need a compulsory reset handle?

A frequency valve device is often equipped with a special lever by means of which water drops from the water-heating equipment tank in manual mode.

The valve with a drain handle allows easy and convenient emptying cumulative Tank Water heater during any repair work and to prevent the inspection of the inside of the tank or cleaning it from the accumulated scale.

Water supply to the water heater

Principle of operation of the safety valve

A safety valve device used in water-heating equipment would more correctly indicate as an efficient valve system. A pair of such elements is located inside the brass or nickel-plated perpendicular-shaped housing.

The lower part of such a housing is represented by the check valve, which helps to prevent water outflow from the waterfront reservoir under reduced pressure in the plumbing system. Inside the perpendicular branch of the volume body, another valve device is set, the task of which is the release of a certain amount of water at elevated pressure.

Valve with emergency lever

The principle of operation of the safety valve device is quite simple:

under conditions of filling the tank with water and when the hot water tap is open, the pressure indicators inside the water heating equipment below the water supply level, which causes a spin plate inside the check valve device;
when the pressure indicators are aligned within the water-heating equipment and the plumbing system, the plate is made to the body walls using a spring, which contributes to the overlap of water intake, inside the water heating unit;
under the conditions of the included mode for heating, a relatively smooth increase in the temperature indicators of water, and, accordingly, the increase in pressure inside the system to the limit indicators is carried out;
the achievement of pressure thresholds, stimulates the compression of the built-in spring on the safety valve, which is accompanied by the opening of the outlet to the fitting. In this case, there is a partial watering of water until the indicators normalize, after which spring device Closes the output, and water does not follow.
the principle of functioning of the safety valve device is caused by dug water from the fitting, which accompanies the heating and lowering the pressure level inside the water supply system. Merchanting water needs a discharge, therefore a special transparent pipe is used, fixed at the exit with a well-tightened clamp.

The tube installed on the fitting should be reinforced, but transparent, which will make it easy to withstand overpressure and control the constant performance of the valve device.

Safety valve device refers to pipe fittingswhich is intended to protect hot water devices from destruction, under excess pressure.

Such an element allows you to perform automatic reset. excess fluid In the sewer system.

The performance of the valve device can be impaired in the inner part of the mud or as a result of receiving a disk part of the damage equipment.

It is for this reason that it is necessary to provide a valve regular preventive inspections, and if necessary, to make timely replacement of worn items with similar new elements.

Video on the topic

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). From the drainage opening of the 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 water treatment, for example, while taking a shower: a constantly outgoing hot liquid will continuously be replaced by 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.

The operation of water heating equipment is directly related to a change in the pressure level in the system. Its adjustment is necessary for the safe operation of the electric cumulative boiler. Modern water heaters are equipped with automatic protection from high pressure In the tank. However, the safety valve for the water heater is necessary when providing safe work.

Purpose

The device of the cumulative boiler is based on maintaining a certain amount of hot water, which is automatically replenished when it is used. In the absence of outflow from the tank, the electric TEN continues to work. Hot water Expanded, its strength effects inside the tank increases.

Water refers to substances that are practically not compressed. With an increase in temperature to 80 ° C, it increases in volume by 2-3%. Excess pressure inside the reservoir can damage it, create an emergency and dangerous situation.

For removal of excess water pressure, a protective security device is used - a safety valve. It is installed on the pipe for entering cold water into the boiler. Through it is derived an extra volume outward. When normalizing the pressure inside the tank, the protective mechanism is closed, the outflow of excess volume is terminated.

Constructive features

Safety valve device for water heater:

Housing
Fitting for reset
Running lever
Two dispense valves with the opposite direction of response
Spring safety valve
Spring check valve

A constructive safety valve looks like two cylinders placed perpendicular to each other. The big cylinder has at the ends of the threaded part for the installation to the water heater and water pipe. Inside the cylinder is placed the check valve, pressing the spring.

Perpendicular to a large cylinder is smaller in diameter. One side, it enters the cavity of a large cylinder. On the other side, a plug or a pressure handle is installed. In the cavity of a small cylinder there is a drainage nozzle with a plate valve of the opposite direction of the response.

Structurally looks like two cylinders placed perpendicular to each other. A large cylinder has a threaded part for mounting to a boiler and a plumbing pipe. Inside the cylinder is placed the check valve, pressing the spring.

Perpendicular to a large cylinder is smaller in diameter. One side, it enters into the largest, on the other side, a plug or a pressure handle of the water pressure is installed. Inside the cavity of the small cylinder there is a drainage nozzle with a plate design of the opposite direction of the triggering.

Principle of operation

Safety protective valve - direct action device. When the reservoir water heating device Filled, the power of the effect of the fluid is pressed by a plate valve, allowing the ability to fill the container.

After filling the tank, the water pressure inside will become greater, under its exposure, the large cylinder check valve will close, preventing the outflow through the water supply system. As fluid decreases inside the reservoir, its strength is gradually decreasing. Check valve is pressed, renewing the filling of the tank.

The increase in temperature increases the level of pressure. Under its impact, above the allowed value, the plate design of the small cylinder works, opens drainage, Excess volume is displayed outside. The pressure inside the system is aligned, the reverse returns to the initial position.

Functions

Prevents the reverse outflow of the liquid from the accumulative tank.
Displays an extra volume of water tank to stabilize the internal pressure.
Levels pressure drops inside the central water supply system.
The forced reset lever can be used for drain during maintenance.
Extends the service life of electric tan, water heating equipment.
Saves electricity, preventing the work of the work of Tan in good.
Protects from an emergency and dangerous situation overheating, explosion of a cumulative boiler.

Views

Different with the following moments:

Running lever. It is needed to verify the serviceability of the mechanism, it is desirable to check once a month. Having lifted the lever checkbox, you can empty a cumulative container. It is important to pay attention to the flag device. Some models are produced with a small screw fixed on the lever - to prevent accidental discovery, emptying the tank.
The arrow on the housing, the designation of the nominal working pressure of the pre-emergency mechanism. It is recommended to purchase devices with these designations on the case to select the optimal option.
Plum fitting. Produced of different shapes. It is preferable to the oblong, stepped form so that it is more convenient to wear a vacuum hose, crimp the clamp if necessary.
Without a trigger lever. By purchasing this modification, you should pay attention to the presence of a threaded lid. It will allow maintenance to carry out maintenance (delete breaks, scale, pollution). This is a more preferred option.
For large capacity boilers (from 60 liters), other models are manufactured with additional mechanisms: a ball valve, a pressure gauge, a regular carving of the fitting. These models are more diverse according to the specimen. You can choose the most liked option. The cost of them significantly increases compared with standard counterparts, may even achieve the level of the price of cheap heating equipment.

Safety or reverse?

Installing the reverse instead of the safety can lead to an unpleasant, life-threatening consequences.

The opposite will prevent the outflow of hot water from the boiler reservoir through the plumbing system. The liquid is heated to the maximum temperature, its strength of exposure inside the tank is rising. If the thermostat will fail, the temperature will continue to rise together with pressure, which will increase the boiling point.

When resetting excess volume through the water tap, the boiling point will return to 100 ° C, but the temperature in the tank will still be significantly higher. Instant boosting of the remaining fluid, selection large number The pair will lead to a strong explosion, which will damage the water heating equipment, the walls of the room.

If the safety valve is not installed

Without the installed prevention mechanism, the water heater will not work properly.

With a constant volume within the accumulative capacity, the temperature increase will cause an increase in force of impact. Having achieved a value that will exceed the level of pressure of the central water supply network, it will begin to push the hot liquid through the plumbing. If you do not open the hot water faucet, the normal pressure inside the tank will be adjusted to the emission of it into the nozzle with the cold. Water heating equipment will spend water electricity.

With a reduction in pressure in the water supply system (reduction of load on water stations at night, accident, repair work) The supply tube will be empty. Hot water from the storage tank of the water heater will turn over the empty nozzle. In models without automatic control of the operation of the electric heater (or with a faulty automation, the TEN will warmly warm, which will lead to its burden.

Spring mechanism should be selected. It is distinguished by reliability, good resistance.
It is recommended to take into account the features of the water supply system, if necessary, install a reducer to adjust the pressure supplied from the central water supply of water.
Need to take into account throughput Protective mechanism.
It is necessary to correlate the maximum allowable level of pressure in water heating system with a working pressure of a prevention mechanism. If the pressure of the latter is low, water from it will constantly flow. With high - it will not work when the water pressure is raised above the allowable level.

Installation

Water heater must be disconnected from electrical network, empty cumulative capacity.
Valve mechanism to install on a cold water pipe. One end to connect with a pipe, another to build into the boiler. It is necessary to monitor the direction of water movement (designated on the housing by the arrow).
If necessary, establish an aqueous reducer to the valve design to stabilize the water pressure from the central water supply system.
Connect drainage Mechanism flexible hose from sewer system. To track good work, it is recommended to bring a transparent hose.
For hidden mounting The water heating equipment is prohibited:
- install shut-off devices between the boiler and the valve safety mechanism;
- Making the distance from him to the boiler more than two meters.

How to check fit?

You can check the serviceability, turning on the water heater (no hot water crane to wait for the total water heating to the maximum temperature. After a prevention protective mechanism, excess water should drip from the prevention protective mechanism.

The valve will not work if:

faulty hot water faucet (the pressure will be discharged through it);
the thermostat is set to 30-40 ° C (water will not warm up to the extent that the pressure inside the tank capacity has reached a valid mark);
the operating pressure of the valve protection device is high, does not correspond to the productive power of the water heating equipment (the maximum allowable pressure in the capacitive tank will not be sufficient to work the prevention valve mechanism. May have hazardous consequences).

Water from the valve device should be periodically assigned. If this does not happen and all listed cases are excluded, the fuse itself is defective. It must be replaced with a new one, after checking its performance.

The safety mechanism should be installed on water heating equipment to ensure long, uninterrupted, safe operation of the device. You should choose the most suitable option for all constructive and functional parameters, otherwise its activities will be ineffective, and even dangerous. At the same time, it is necessary to periodically check its serviceability, about once a month. When a malfunction is detected, it is necessary to replace the non-working valve to the new one.

Its independent improvement is very dangerous, replacing the reverse valve mechanism. This will lead to unpleasant consequencesbecause of which, it is likely to be replaced by the acquired water heater new.

Friends! More interesting materials:

How to do solar water heater For home with your own hands?