How to change the valve on a boiler without draining

Boiler safety valve: structure device, principle of operation and installation rules

Self.installation of a boiler is considered a responsible event requiring maximum compliance with the norms and rules for connecting. A security group must participate in the water heater, which includes a safety valve for a boiler. a small but functionally important device.

In this article, we consider the varieties of safety valves, its structural features. After all, in order to install the heater without errors, you should understand the device and the principle of valve operation.

We also give instructions for the binding of a boiler and tips for installing a safety valve, give useful recommendations for the choice of suitable equipment.

Types of safety reinforcement

Obstacular valves are often confused with the opposite, and sometimes the term “reverse” in relation to them is simply used. In fact, these are two completely different devices, although having common features.

The check valve is responsible for ensuring the movement of the environment inside the pipeline in only one direction, while the purpose of the safety is to protect the pipe and units connected to it from destruction provoked by increasing pressure on the network above the normative.

Replacing concepts occurs, since the second important function of the fuse is to create a barrier that prevents the movement of fluid in the opposite direction.

Industrial type mechanisms differ from simpler and more compact devices used in everyday life. This is how the spring valve installed on the production pipeline looks like

There are several types of locking mechanisms that protect complex technical devices from pressure jumps. Among them are spring, magnetic-spring, lever, lever-carbon devices.

The choice of one or another type is explained by the purpose of the pipeline and the characteristics of the environment that moves along it: water, oil, hot steam, chemical aggressive solutions.

How To Replace A Water Heater Drain Valve

For installation of an electric boiler, one type of valves is designed. spring. They may differ in appearance, but their internal content looks the same.

How to pour a water heater

The accumulative heater can operate in periods or constantly. In the stage of non.use, the accumulative tank should be devastated. This will protect from damage to pipes at minus temperatures and update the stagnant dirty liquid. There are several ways how to drain water from the water heater. The rules for disassembling the unit are also indicated, which must be observed.

What may be required for the drain procedure:

A large container may be needed if the device is not installed in the bathroom. Also turn off the network, block the cold tap. Cool the liquid to a safe temperature.

through the safety valve

It is placed when installing a boiler on a pipe leading to Baku. Needed for rapid drain when exceeding internal pressure. The valve has a segment for connecting a hose and lever. Periodically, check it. raise the lever. No leak. clogged, requires cleaning/replacement.

  • Turn off the equipment from the network, close cold water.
  • Connect the hose to the nose or substitute a bucket/pelvis under the stream.
  • Unscrew the safety valve valve, let the water leave.

The flow rate is low: the volume of 40 l will be released in 1-2 hours.

Important! If the valve is open, but nothing flows, you need to clean or replace it. Otherwise it will not work to lower the news.

through the pipe of the cold water

A gas key is needed here. With this method, you can devastate the device in 5 minutes.

  • Block hot and cold water in the house, block the power of the heater.
  • Twist a hot crane. Otherwise, boiling water flows in a large stream, flooding the room.
  • To the device to substitute a large container.
  • Find a nut that fixes a valve with a pipe, a hose. Unscrew, disconnect them.
  • Spin the nut connecting the tank pipe and the safety valve.
  • Take out a valve, inspect, clean or replace. The liquid can flow weakly or not flow out at all.
  • To drain you need to run the air inside: open a hot tap. The air enters the tank over the pipe, flows out more intensively from the boiler. The pressure is regulated by the valve of the hot water crane.

drain through the hoses of the entrance and exit

Guarantees fast but uncontrolled drain. The boiler should be located strictly above the bathroom. The flow cannot be reduced or stopped.

  • Block the cold riser and turn off the unit from the network.
  • Disconnect the valve, a cold water hose from an incoming pipe. Remove the pipe from the release.
  • The liquid is drained with a quick stream from both holes. The tank will drain in 2-3 minutes.

We drain from the heaters of a small volume. 30 liters

  • Remove power access to the device.
  • The key to block cold water at the entrance to the boiler.
  • Open a hot tap, release liquid.
  • Connect the hose to the pipe.
  • Open, remove heated water, let the remnants leave.

We drain from boilers of medium volume-50-80 liters

It will take a flat screwdriver, a hexagon of 4 mm and a wrench for 24 and 32.

  • Turn off the device from the network, block the incoming cold water.
  • Open a hot crane.
  • Turn the valve on the output pipe for air flow.
  • Connect the hose to the hole at the valve of cold water. Drain everything.

It is important to know that it will not work to drain the tank completely with these methods. To do this, you need to disassemble it.

How to completely drain water from a water heater

  • Water water by any method.
  • Spin the lower heater cover.
  • Remove the wiring of the signal lamp.
  • Disconnect the wiring, remember the correct connection.
  • Loosen the nuts holding Ten’s flange. Water drains, spin the nuts. Remove the heating element.

Bottom line: the selected drain method depends on the preferences of the user, the design of the device and the availability of suitable tools. To complete devastation of the tank, it is necessary to promote the device from below.

change, valve, boiler, draining

Is it necessary to devastate the heater

This is affected by the design, tank material, conditions, frequency of operation.

  • The boiler is installed at an unheated dacha. In winter, the water inside will freeze and can break pipes and tank;
  • It is necessary to repair the device, clean the heater and the insides, replace the anode, if the warranty period has expired;
  • There are impurities, dirt, sand in the water;
  • water is required during a complete disconnection of the water supply. 40-100 liters are enough to use the toilet, household needs.
  • The warranty period did not end. Otherwise, the service center will refuse free maintenance. There was a problem. contact specialists.
  • the heater is not used, but stands in a warm room.
  • it turns on after a long break and you need to drain the old liquid. It is enough to open a hot crane and pour the entire volume. Update is needed every 3 months of downtime.
  • Microbes from stagnant water are washed by draining the liquid through the crane, a high heating temperature. Some models have an internal antibacterial coating.
  • an empty tank quickly rusts in wet air.
  • The heating is oxidized in a dry environment faster.

Important! The smell of musty water is removed by flushing the device. It is necessary to pour the accumulated, fill in fresh and turn on the limit heating by 75 degrees Celsius. Repeat 2-3 times.

How to drain water for the winter from the heater

If the device is in a heated room. an apartment, a private house, then you can not devastate. If the temperature is below 5 ° C, the drain is required. Otherwise the water will freeze and damage the tank.

Replacing the fuse valve

The correct installation of a storage water heater (you can read about it here) suggests that a safety valve with a lever or without a lever should be installed on the cold water supply tube into the water heater. The main distinguishing feature between the above valves is that with the help of a valve with a lever, you can forcibly drain the water, with the help of a valve without a lever this possibility is not possible. Therefore, many choose valves with levers, especially since both of them are almost the same.

Checking the performance of the safety valve at home is very simple, it is necessary to turn on the temperature of the heating of the water in the tank to the maximum and the water is dripping or not or not. Remember that the installation of locking reinforcement between the valve and the water heater is strictly prohibited.

How is the boiler pressure drop in the operation of the work principle

With a valve for the discharge of excessive pressure of water from the storage water heater, a shutter is combined from flowing. Devices are placed perpendicular in a whole case of cylinders with the letter “T”. Segments work independently of each other.

A safety valve device for a water heater (two of its segments): a shutter (plate). a disk with seals in a circle, overlapping the duct, in the center. a rod holding a spring configured for a certain onslaught. That is, it is a fully mechanical product.

The protective valve plays the role of the reverse shutter simultaneously and for reset. Principle of operation:

  • The segment from flow. at one end for inserting in the riser of the riser or connecting a flexible hose from it is the threaded part of the “dad”. On the other, there is a clutch with carvings (“mother”), for eyeliner or standard input “cold” eVN fitting. The check valve works like this:
  • in the absence of supply, the shutter is closed, does not open out, holding the contents of the tank;
  • The water from the eyeliner is supplied along the arrow, the pressure through the “plate” pushes the spring, the passage opens, and when the pressure is reduced, the disk returns, blocking the channel;
  • completely drowned out;
  • with a threaded cork hiding the adjusting bolt (under the hexagon or screwdriver);
  • common, more convenient. with a lever on the valve for manual discharge, checking and with a bolter from random raising;
  • The water pipe from the valve: short, smooth or long, embossed for a plum hose.

On the case, the operation pressure is knocked out. standard 7 atm. Working pressure, this is the value to the indicated mark, excluding short.term excess when activating the node.

How the water heater emergency valve works

After the installation and strapping of EVN is filled: open a cold riser and a hot mixer. The pressure in the pipe is enough for moving the reverse shutter, the stream will pass freely into the container, the air is replaced, it leaves the open mixer, after the appearance of water from the parsing point. the tank is complete.

In the full tank, the number of atmospheres is approximately equal or slightly higher than the “supporting” of its value. If there is no protection against reverse leak and with closed cranes, hot liquid will find a way out through the same entrance. into a cold crane, a toilet tank.

The pressure in the MKD water supply is often reduced (accidents, repair, planned work). Without a reverse tap, the tank is empty and you will need to wait again for heating. There are no reasons for the auto shutdown, electricity is wasted, and when the supply is stopped and if the protection against “dry” work is not used, the heater will overheat and block it.

Working boiler, this is the balance of permissible temperatures and loads, its maintenance is mandatory. There is a certain supply of capacity for the amount of MPa, which is indicated in the instructions.

The pressure drop valve is needed to reduce the onslaught in the tank, to ensure dynamic balance. When the amount of MPa approaches the critical mark, the spring is compressed, the excessive pressure of the water is discharged into the drainage pipe.

Not only it is impossible, but also dangerous to limit yourself to one reverse shutter, you need a knot combining it and the demolition, otherwise the tank will turn into a kind of bomb. Water at 90 ° C expands by 3%, and so on the increasing.

The thermostat stops heating, but can fail. There is no way out for an increasing onslaught. the faucets are blocked, and on the other hand, the return node closed the return path.

In a closed space, the temperature is sharply achieved above 150 ° C, the breakdown force up to 4. 8 bar and higher increases in parallel. MPa will lead to excessive expansion of the walls and chips of enamel. But the danger is different: large pressure increases the boiling point, but at the same time the temperature grows.

A small crack or opening of the mixer is sufficiently enough. a sharp drop in MPa will lead to a decrease in the boiling mark to the standard 100 ° C, but the liquid is heated more (150 ° C and above). instant boiling of a total volume of 50, 80, 100 l with the formation of steam, will occur at once, A strong explosion will follow.

On the other hand, the connection without a check valve is not desirable, but the permissible in extreme cases and safer. there is no risk of gap, and with a decrease/increase in MPa, the water will simply go back to the highway.

Electricity overspending without a check valve

The hot water supply system with a water heater can function without a shut.off valve, but then in the case of pressure growth, hot water will be squeezed into the supply main. This will entail an overspending of electricity, because the device will have to warm more water.

Extra wound kilowatts will need to be paid, which will not add joy to the owner of the apartment or at home. In addition to the financial side of the case, there is also practical inconvenience. After all, instead of cold water, warm water can run from the taps.

These problems must be added to those disadvantages that were described above. Therefore, do not agree to install a water heater without installing a safety valve.

Information on the safety valve case helps to choose the right part for the primary installation or replacement during the repair of the water heater

The procedure for connecting the water heater

After installing the water heater, they begin to connect it. To do this, take a tee, try on, winding on the input pipe of cold water, marked in blue. If there is not enough thread, then several turns are added with a special device so that the tee is placed correctly.

Then they wrap the bags of the thread, coat it with paste, which provides hermetic connection, and wind up the tee, tightening it with a divorce key. Next, a crane is wrapped on the side of the tee to ensure the rapid drain of water from the boiler in the case of replacing the burned heating element or cleaning the tank from scale.

The connection also compacts packley or tape for threaded joints. From below, the safety valve is connected to the tee, focusing on the arrow showing the direction of cold water entering the water heater. The arrow is located on the valve body.

Then one part of the American is wound on the safety valve. The second part of the American is wound on the crane and the first part is connection. Then, a transition coupling is screwed into the crane for connecting with propylene pipes to the water supply.

Next, the connection to hot water is made. To do this, they are wound on the output of the boiler pipe, marked with red, the first part of the American. The second part of the American is wound on a cutting crane. Complete the connection.

Then a transition coupling is also screwed onto the crane for soldering a propylene pipe. It remains to connect the boiler to the cold and hot water supply system. Propylene pipes can be replaced with a flexible eyeliner.

The connection diagram of the water heater (boiler) to hot and cold water supply systems shows in what sequence the installation of the device is being installed

An alternative way to install a check valve

This method was invented by the master, faced with the problem of pollution of the safety valve with sediments that fell from a tank with hot water under pressure. If a piece of rust falls under the piston plate on the saddle, then the valve cannot work correctly. He constantly remains open.

change, valve, boiler, draining

In order to prevent this development of the situation, it is necessary to mount the valve at the middle of the tank. That is, as described above, the tee is joined to the input pipe of the boiler, and then a little differently is connected.

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The drain valve is twisted from below, and the pipe is removed to the side, the corners are placed, the pipe is again, and somewhere at the level of the middle of the tank is set a safety valve. After it there is a cutting crane and fitting, through which the device is already directly connecting to the water supply.

With this method, the valve always remains clean and does not “freeze” the plate piston above the saddle. In addition, in the absence of water in the system, such a bending connection serves as a kind.

You can learn more about this installation method from the video.

change, valve, boiler, draining

Water heater operating tips

During the operation of the boiler, it is necessary to ensure that the drainage hole on the safety valve does not turn out to be clogged or locked. Drainage can be clogged with rust, small solid particles and other impurities contained in tap water.

To check its working condition, a small amount of water is periodically discharged, pressing a special lever or turning the handle. In the instructions attached to the safety valve for the water heater. It is indicated how the mechanism of forced valve opening functions.

Installation of a filter for cleaning tap water solves partially the problem. It is undesirable to change the factory settings of the stiffness of the spring in valves models endowed with such an adjustment.

Such an intervention may entail the destruction of the water heater tank due to the exceeding the permissible pressure values ​​within the household appliance.

Forced discharge of water from the boiler in order to reduce the pressure in the tank is carried out by pressing the lever

Water is constantly dripping. what to do and how to fix it?

Some boiler owners are faced with the problem of constant seeping water through the drainage hole. Water can drip from drainage for two reasons:

The first problem is eliminated by replacing or setting up a device, which must be performed by a hexagonal key. In this case, a little twisting the clamping nut located at the entrance inside the valve.

You can get to this nut by partial analysis of the device in which they remove the lever, nut and sealing washer. In general, you can solve the problem faster by buying a new valve.

The second problem associated with high pressure in the system disappears during the installation of the reduction valve.

The connection of the tube with the transparent walls to the drainage hole was made without its output into the sewage system

Connecting the withdrawal in the form of a transparent tube from the drainage opening of the safety valve to the sewage system through the pipe with a slanting inlet

Flows from the valve? What to do?

If it drips or flows from the safety valve for a boiler, you need to understand why this is happening and how to solve this problem without harm to the water heater.

If it drips when heated by water, nothing is terrible, since the water expands when heated and an excess fluid forms, which helps to dump excess bar.

When it flows constantly or without heating, then:

In the second case, it is necessary to attach the hose to the descent outlet pipe in order to get rid of water. In this case, it is impossible to immerse the lower end of the hose into the water. With a strong leak, you need to check the valve by means of a pressure gauge. If the water pressure exceeds 3 atm, it is necessary to install a regulator that will lower the pressure. Only a specialist can perform this procedure, since the presence of skills and experience will be required.

The water heater may stop heating due to the fact that the valve passes water. This is possible if the equipment is in work mode. In the process, the consumption of electricity will be considered, the heating bulb will burn, but the water will not increase the temperature at all.

The right solution in the event of malfunctions of water heaters is a call of a master who will quickly and easily eliminate problems can accurately find the root of all troubles.

Installation. Where to put?

In order for the boiler to work without problems, installing a safety valve is a need. Many manufacturers are component of water heaters with branded valves. If it is not, you need to buy. You need to choose based on the permissible pressure. This information is indicated in the instructions.

Installation is performed, both using adapters and without them. Will have to follow certain rules.

The element is necessarily placed on a pipe supplying water in a boiler, in the place where it falls into the container.

Correct valve placement is between a locking crane and a capacity. Когда резьба соответствует, то он накручивается на патрубок емкости, а потом на него накручивается кран.

The installation of the element is carried out exclusively taking into account the direction of the arrows. Each compound is treated with sealant.

The thread is delayed tightly to avoid leakage in the future. But you should not push too much, since you can tear the thread or damage the bronze case.

The installation of a safety valve for a boiler does not always pass one algorithm, since water heaters differ from each other, like valves. Many modifications are equipped with a response regulator. They respond to pressure level. Regulated according to the principle of weakening/pulling up the clamping spring. You need to understand that all systems and mechanisms are regulated in the production process, and you should not accept independent attempts to adjust.

In order to check the quality of the valve installation. water is typed. When a leak appears, you can try to tighten the threads slightly until it stops dripping. If the flow is strong, you will have to redo.

Device and principle of action

The device to prevent a serious accident looks surprisingly simple, and its dimensions are small. it fits in the palm of your hand. It is a small mechanism consisting of two perpendicularly located spring.loaded valves enclosed in one metal case. In fact, these are two cylinders (tubes), one of which is slightly larger than the other.

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

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

A second valve is installed in a smaller diameter tube located perpendicular to the first, the spring of which is adjusted to the opening at a certain pressure exceeding the pressure for the first valve. This is the fuse that protects against the explosion.

Thus, when the pressure rises and the check valve does not allow the water to go into the supply cold pipeline, the second valve opens, and it is dumped through the drain pipe.

There may be special notches on the pipe that contribute to an easy putting on a hose of suitable diameter. This hose must be fixed with a clamp and brought either to the sewer or into a container that will have to be empty from time to time. This will have to be done infrequently, since the amount of water squeezed during the operation of the water heater will be small.

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

Radiator Not Working.- Valve Change without draining

An arrow is very often applied on the safety valve case showing the direction of water movement to facilitate the installation. A marking is usually applied to a small pipe, indicating the pressure in the pascal, in which the emergency valve is opened.

Is it possible to put other valves

Иногда вместо специального предохранительного клапана для бойлера ставят подрывной, который предназначается для аварийного сброса воды на отоплении. Although their functions are similar, the main mode of operation is fundamentally different. The subversive should work only in emergency situations. It is designed for a volley discharge of a large volume of fluid. It is not suitable for constant pulion of small portions of water. Accordingly, it will not work correctly.

Another case is the installation of only the check valve. He will not let the water drain when the pressure is reduced in the water supply, but he will not save from increasing pressure in the boiler. So this option is also not working.

The operation of the safety valve

It is worth noting that both valve elements, despite the fact that their installation is made in one building, work completely independently of each other. Valve fuse according to the principle of operation is largely similar to the automatic valve of the boiler. As soon as the pressure inside the container increases above the limit 6 bar, the locking plate under pressure from the water moves, squeezes the spring and frees the drain hole. Part of the water goes into the sewer until the pressure is leveled to the norm.

In addition, a safety valve for a boiler with a descent handle allows you to clean the container of accumulating salts and sediment. To do this, once in a couple of weeks you need to install a handle or flag in a horizontal position. In some models you will need to click on the flag and hold it for several minutes. Water through the drain ished particles and precipitate accumulated in the valve mechanism.

Advice! Using a 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 into the supplying water line. As the water is spent in the heating container, the locking plate under pressure in the highway lifts and releases the running part to fill the boiler.

If the pressure in the water supply sharply decreases or increases, the valve plate blocks the flow of hot water back into the highway or extinguishes a hydraulic blow with a spring. Especially relevant is the installation of a safety valve for a boiler on cheap Chinese products in which there are normostats or thermal electric relay.

Without installing the checking and safety valve, the Chinese boiler can easily turn into source of danger. to coordinate the owners with boiling water or pour the apartment with hot water. Masters. practices often admit that it makes sense to install a safety valve even for an indirect heating boiler, on which there should not be such problems by default. For example, repair work on water supply systems is almost always accompanied by water drivers and pressure surges, in which case the boiler is subjected to rigid testing, regardless of its device.

What is it needed for?

The valve task is to reset excess hot water in the working capacity of the heater. Water expansion creates great pressure that threatens the integrity of the device.

The valve automatically drains a certain amount of water, leading the total volume to the nominal value. This allows you to save the heater, protect the equipment and people from contacts with hot water.

Excessive volumes of water are excreted through a special pipe connected to the drainage system or a special reception tank.

Why is a safety valve needed on a boiler

First, we will figure out why you need a safety valve on a boiler. During the heating of the liquid, water vapor forms in the airtight tank of the boiler, due to which the pressure in the system increases. Since all the taps are closed, the dumping of pressure through the drain into the system is impossible. Because of this, excess pressure accumulates in the aggregate itself.

When the water heats up to 60-65 degrees, the safety valve of the pressure discharge for the boiler should work and turn off the device. At this moment, the pressure in the water supply system reaches 2.7-3 bar, and in the heating tank due to the presence of water vapor it is higher and equal to 4 bar. These are normal values.

The main functions of the safety valve on the boiler:

  • Protection against spontaneous fluid flow into the water supply system, if there is no water in it yet;
  • Excessive pressure in manual and automatic mode.

Installation. Where to put?

In order for the boiler to work without problems, installing a safety valve is a need. Many manufacturers are component of water heaters with branded valves. If it is not, you need to buy. You need to choose based on the permissible pressure. This information is indicated in the instructions.

Installation is performed, both using adapters and without them. Will have to follow certain rules.

The element is necessarily placed on a pipe supplying water in a boiler, in the place where it falls into the container.

Correct valve placement is between a locking crane and a capacity. Когда резьба соответствует, то он накручивается на патрубок емкости, а потом на него накручивается кран.

The installation of the element is carried out exclusively taking into account the direction of the arrows. Each compound is treated with sealant.

The thread is delayed tightly to avoid leakage in the future. But you should not push too much, since you can tear the thread or damage the bronze case.

The installation of a safety valve for a boiler does not always pass one algorithm, since water heaters differ from each other, like valves. Many modifications are equipped with a response regulator. They respond to pressure level. Regulated according to the principle of weakening/pulling up the clamping spring. You need to understand that all systems and mechanisms are regulated in the production process, and you should not accept independent attempts to adjust.

In order to check the quality of the valve installation. water is typed. When a leak appears, you can try to tighten the threads slightly until it stops dripping. If the flow is strong, you will have to redo.

Squeezing of work on replacement

As can be seen from the list of defects, many breakdowns require replacing the safety valve. This procedure is performed as follows:

  • Water is overlapped at the supply into the boiler;
  • The water heater is disconnected from the power supply. The plastic cover is removed and the power supply terminals are disconnected;
  • The ball valve near the tank is overlapped and the cold water supply hoses is connected;
  • If the boiler is installed at a certain distance from the washbasin or bathtub, then a flexible hose is connected to the ball crane and is removed to the sewer system, after which the tap opens and drains;
  • The remains of the FUM tape and sealant are removed from the pipe, and it is checked for damage;
  • It is advisable to open the boiler tank, and clean the inner surface from scale and dirt;
  • Clean or, if necessary, replace the heater.

Summing up

Eliminating the leakage by replacing the safety valve is a fairly simple solution. The procedure may not even be performed by a too experienced master. It should be remembered that in order to extend the service life of the water heater, it is necessary to perform the systematic cleaning of the tank, at least once a year.

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