Where is the safety valve on the water heater of the accumulative

Supply valve for the water heater: recommendations for choosing and installing

The use of safety valves is regulated by national and industry standards, operating rules and technical instructions.

The following regulatory documents are used for blood vessels operating under pressure:

  • (PB 03-576-03). Safety rules for blood vessels and pressure installations.
  • Boiler Pressure Vessel Code American standard.
  • GOST 24570-81 National Standard for Safety valves.

Systems protected by emergency reinforcement, in the case of their emergency work or accident, pose a significant threat of production and public security. Therefore, their design, equipment, installation, operation are supervised by authorized bodies that monitor compliance with the requirements of the rules and standards at all stages of the life cycle of equipment. This is instructed to replace the broken safety valve on the water heater

The valve replacement work is performed in the following sequence:

  • First we drain the water from the heater and turn it off from the power supply.
  • Overlapping the supply of cold and hot water to the device. To do this, close both valves on the water heater. If they are not, then they simply block the supply of water to the apartment.
  • Next, open two different cranes in the house. On one mixer we open the hot water crane, and on the other. cold.
  • Now we open the taps on the boiler and drain the remaining water.
  • Disconnect the flexible hose from the back of the reverse discharge.
  • We unscrew the old valve, and install a new product in its place.
  • Close all the taps in the house and connect the unit to the power supply system.

If in a private house there is no hot water supply system at all, then draining the liquid and disconnecting the device is performed in the same manner with the exception of the item with the opening of the hot water mixer and overlapping the crane on the pipes with hot water.

Varieties of valves

By the mechanism of its action, the bypass valves are divided into the following types:

In the first samples of the check valves for the boiler, the main working element is the spring, and the second is built in the lever that controls the state of the system in test mode. Magnetic-spring type models are attributed to combined devices connecting the advantages of field and mechanical structures.

Depending on the type of locking mechanism, the following types of check valves are distinguished:

The plate of the disk mechanism in the first models moves up and down. After the pressure appears in the direct direction, the shutter opens, and in the event of its disappearance or weakening, it closes due to the spring or its weight.

The device works to close and holds the pressure also when changing the direction of movement of the fluid flow.

A rotary or irrevocable variety is made in the form of a folding sash, turning and opening under the pressure of the liquid. For its closure, the force of the spring is used.

Ball execution is understood as a mechanism in which the fluid flow is blocked by a ball pressed to the saddle with a return spring. The pressure of the liquid of another direction squeezes the ball in the opposite direction, opening the passage for it.

The design of the interflant valve is similar to the lifting mechanism, but in it the plate moves in the direction of the flow. Its modification contains two sashes folding towards. The double.leaf structure in open form has a minimum resistance to fluid flow.

If we classify the valves according to the material from which they are made, the following options are distinguished:

  • Brass products, characterized by reliability and wear resistance. They are most often used in everyday life.
  • Cast iron valves are very inexpensive devices that have one characteristic drawback. They are not protected from rust and installed only on pipe highways.
  • Stainless mechanisms, which are high.quality and reliable products that have a high price.

It is advisable to use the latest samples only in particularly critical sections of pipelines.

Pass or Fail. Vacuum Relief Valves

According to the method of fixing at the working facility, all valves of the reverse flow of water are divided into the following types:

  • The coupling mechanisms installed in the rupture of the pipes through two threaded couplings of the corresponding size. This variety is most common in conditions of everyday life, in some cases it is used in production.
  • Flange devices where the bubble mechanism is connected by means of connectors of a special design. They are most often used in combination with cast iron analogues on large pipes.
  • Cut valves installed between two flanges that are tightened for strength with through stilettos. This variety is most often placed on the same trunk pipelines.

Installation sites

There are many sections and gestures in household water supply and heating systems where it is allowed to mount the safety valve.

  • On the diving into the apartment or a private house from the centralized hot water supply line (DHW).
  • After the fluid consumption meter, providing its protection against a water driver.
  • At the entry of a gas or electric water heater (boiler), which avoids the outflow of heated and expanding water into the highway with the CVS.

Protective elements are installed in places provided for by their design features and direct purpose.

Do.it.yourself installation

Choose fuses for the pressure on which the unit protected from emergency situations is designed (it is given in the passport). The volume of the tank, according to which the operations are designed for 6, 7, 8 and 10 bar, affects the choice, is affected by the choice. Its installation is simple: a little FUM tape or oiled packs is wound on the thread, after which the product itself is wound on a working pipe. The device is wrapped manually to the stop, and then two more turns is made with a key.

  • The place for installing the adjustment device is determined. It is selected depending on what water the valves should be put on the water heater. most often on the CVS.
  • The presence of a ball crane is taken into account. it is needed to empty the tank before winter conservation.
  • The boiler crane is more often placed on the side on the tee, mounted directly on the input pipe.

A safety valve is wound up to it from below.


To check the serviceability on the valve product, a lever of discharge of excess pressure excesses is provided. When the heater is turned off, the lever should be raised several times. lower these surpluses. After the water stops, wait for the moment until the heating begins. If the fluid does not stop, most likely, the spring mechanism is clogged. In this case, the collapsible model is dismantled, cleaned, and then put in its former place. With a non.vegetable valve, it will need to replace it with a new, previously purchased sample.

Much worse if the water does not flow to the introductory pipe. The reason for this is the appearance of a blockage in the valve itself or in the output fitting. After checking these places in the absence of a result, you will have to replace the product.

How is the safety valve arranged

The device of this safety accessory is quite simple. It consists of two perpendicular cylinders of different volumes having a common plane. In a larger cylinder, there is a rubble valve inside, which is pursed using a spring. Thanks to him, water moves in one direction, as with an ordinary reverse element. This cylinder is at the input to the water heater and connects it to the pipe that brings cold water. On both sides, it has a thread in the form of a thread.

And the second cylinder has the following characteristics:

  • is perpendicular to the main one;
  • from the outside is equipped with a plug;
  • Equipped with a small withdrawal drainage pipe.

From the inside in a small cylinder there is also a ram valve, but it works in the opposite large cylinder side.

How the design works

The safety valve must be installed at the entrance to the water heater and configured for maximum pressure. In a closed form, two forces will act at once on a sensitive valve:

With a decrease in water pressure, it opens, and cold water enters the water heater. When the pressure is leveled, the device needs to be closed, but the water from the tank does not spill due to the presence of a check valve at a water pressure.

With an increase in the pressure force during the heating of the water, the protection of a small cylinder is triggered, then excess water is removed through the lateral output of the structure.

If you should not worry a liquid from the safety valve to drip fluid, there is nothing terrible in this. Put the container under the valve or attach the hose to the drainage hole, then lower it into the toilet or sewer.

Instructions for installation and adjustment

Installation of a safety valve on a water heater begins with the choice of a suitable model. The permissible pressure in the device must correspond to the working pressure of the water heater. These data are given in the instructions.

Connection is performed with your own hands according to the instructions.

  • Put a safety valve on a branch of the water supply, which supplies cold water to the tank.
  • The device should be placed between the tank and the locking crane. If the valve thread is suitable for the thread of the input pipe, the part is simply untwisted. To seal the compound, use the FUM tone or linen.
  • The thread is tightened tightly to prevent leaks. There is no need to make excess force, since the bronze case may burst.
  • After the hardware of the system, the water heater is checked. Gain water in a container, inspect all compounds. There should not be leaks. If the water appears, you need to drain the liquid, disassemble the water heater and mount it again. The valve is checked by turning the flag. If the water flows from the fitting, and after the flag return to the starting position, the leak disappears, the device is mounted correctly.

With normal operation of the tank and high quality of tap water, the device rarely fails. Over time, dirt or lime plaque may be deposited here, so the valve is periodically cleaned. It is easy to do it: it is enough to beat water once a month with an emergency lever. The pressure of the water will wash the garbage and dirt, and the plate will again tightly stand into the nest.

safety, valve, water, heater

The control of the safety valve on the water heater is to weaken or tighten the spring in the housing. To do this, the structure must be removed from the tank and completely disassemble. There is a need to set up with too low or too high constant pressure.

The mechanism was originally adjusted by the factory manufacturer per standard parameters of the water supply.

Why doesn’t drip water from the safety valve of the boiler

The valve replacement work is performed in the following sequence:

  • First we drain the water from the heater and turn it off from the power supply.
  • Overlapping the supply of cold and hot water to the device. To do this, close both valves on the water heater. If they are not, then they simply block the supply of water to the apartment.
  • Next, open two different cranes in the house. On one mixer we open the hot water crane, and on the other. cold.
  • Now we open the taps on the boiler and drain the remaining water.
  • Disconnect the flexible hose from the back of the reverse discharge.
  • We unscrew the old valve, and install a new product in its place.
  • Close all the taps in the house and connect the unit to the power supply system.

If in a private house there is no hot water supply system at all, then draining the liquid and disconnecting the device is performed in the same manner with the exception of the item with the opening of the hot water mixer and overlapping the crane on the pipes with hot water.

How the valve performs the function

You can find out full information on the selection, operation and maintenance of boilers (water heaters) of all manufacturers, you can go if you cross.

In addition to specific information on the site, you can also study specific problems on other people on this topic, who have already bought a boiler (accumulative water heater) and thus avoid them. Regularly replenished list of such problems and their solution will be found.

In order to understand the principle of operation, consider its device. The safety device is two perpendicularly located brass cylinders forming a common cavity. In the inside of the larger of the cylinders there is a plate element, which is pressed by a spring and allows you to move fluid in only one direction, preventing its outflow. The heater and the pipel of the cold line are connected to the two ends of the larger cylinder, which end in a threaded connection.

Inside the smaller cylinder is also a plate element, which has the reverse operation. At its output there is a handle of forced discharge, below there is a pipe for the removal of excess water, which is connected to the sewer using a plastic tube. You can not use buckets, jars to drain.

How it works? The pressure in the water supply squeezes a spring of plates, the liquid enters the tank. When the container was filled, the pressure in the tank exceeded the tap, the valve closes, the flow of water stops. During the flow of water, the pressure changes, the valve opens, the water again begins to fill the boiler. When the fluid in the container heats up and begins to expand, the protective plate of the smaller cylinder is triggered, excess drainage occurs through the lateral drainage hole, the pressure in the tank is aligned.

How to choose a safety valve

There are magnetic-spring, lever, lever-carbon, membrane shutters. For water heaters, spring.

Types of safety valves for electric heaters, 3 groups for different volumes:

On any capacitive water heater, you can put the listed types of safety shutters.

  • Combining and the third valve. bypass with an additional function of discharge of excess MPa into the high water line, until the value in it becomes equal with the boiler. This is the best option for choosing;
  • Reset valves with pressure adjustment. are used less often, the error in setting can be fatal, more often for industrial equipment, heating.

Geyser Baar Baar Trip Kar Raha Hai || Water Heater. Pressure Relief Valve | Repair and Replace

The discharge valve adjustment in customizable models is carried out exactly according to the instructions, a selector or a rod under the lid (hexagon, screwdriver). Sometimes the positions are not signed, so the step and compliance of the regulator’s position by the number of MPa must be checked according to the technical documentation. Standard adjustable models. on the range 6. 10 bar with a step of 0.5 bar.

Initially, in the configuration of EVN there is an emergency valve for the desired pressure. If the node is bought, then to the limit value indicated by the manufacturer on the tank and under the diameters of its fittings (usually 1/2 ”, for a capacity of 100 l 3/4”). The underestimated value of MPa will lead to a constant course, more to the non.work of. Cannot be taken with a margin, the value should definitely coincide.

How to choose a high.quality safety valve for capacitive electric buses:

  • Seamless casting, brass, sometimes covered with nickel. Aluminum alloys with iron or copper are less of high quality;
  • When pressing the rod, the plug walks tightly, possibly with a slight jamming at the end;
  • If, with strong pressing on the rod, the air in the cylinder and the air will pass freely, then this is a sign of poor quality;
  • relief marking is not only with the arrow of the direction of water, but with the size of the operation, without it (even if the parameters are in the instructions), it is better not to buy the product.
  • on the reverse segment. the direction of the direction, may also indicate the diameter of the connection;
  • On the reset:
safety, valve, water, heater
  • Driving pressure;
  • Manufacturers labeling, standards: en, ch, 10.10, 14.89, 23.12 14.13, rr. The main thing is that the presence of designations is precisely on the case, the decoding. on the sites of the factories, in the instructions;
  • On models with the bypass segment often the letter P.

Calculation of the safety valve, this is a comparison, what pressure (on the case, in the instructions) it is also configured for a storage water heater. The product is selected under the boiler. The calculation methodology takes into account that there are adjustable models, then they are configured to the critical parameter specified by the manufacturer for EVN.

How and where the valve valve is put

The place of the protective unit is a cold eyeliner, between an overlapping flywheel riser and a water heater fitting. Can be cut directly into the pipe or, if there is a drain crane in front of it, first install the tee no further 200 mm from the exit to the EVN.

The vertical location is more common. But the bounces and position of the pipes are different, the horizontal installation is allowed.

If the parameters of the water supply system are not stable, then in the circuit the reduction valve is included in the circuit (from the eyeliner), complex models are already with it.

Installation is standard, you need packl, adapters (“American”), fittings for plastic pipes, flexible eyeliner with pitch nuts. The tee is twisted by 3. 4 turns.

It is necessary to install the valve on the water heater no further than 2 m before the boiler, the gap should be minimal, otherwise an enhanced onslaught on the spring will occur and inadequate response. The correct option is to connect directly to the tank fitting.

Before the security group (in the direction of the tank) there should be no reinforcement according to the safety rules, but draining through the reset with a very narrow passage is slow. 3, 5 hours, so sometimes they put a separate crane in front of it for this purpose. The main thing is to periodically check that the tee is not clogged, otherwise the path to the safety shutter will be closed, the tank will tear off.


Sometimes individual elements of the water heater or the entire system stops working properly. This reduces the safety of the structure and can lead to sad consequences. In this case, you need to find out the cause and place of the breakdown as soon as possible and either eliminate it yourself, or call it a specialist. Thermostats, heating elements and safety valves are most often out of order. over, the problem in the work of one of them can instantly affect the rest. You should never install elements that are not suitable for their parameters to the boiler parameters or have different connection methods.

Problems cannot arise on their own, they have certain reasons.

  • Untimely replacement of damaged parts. For example, the check valve should change at least once a year. It is cheap and will not require large costs.
  • Incorrect installation of the entire system. If the fuse insert into the pipe is made with insufficient waterproofing or at an too large distance from the entrance to the boiler, the system will not work properly.
  • Voltage drops in the mains can lead to failure of the heating elements of the system.
  • The presence of factory marriage or the absence of preventive examinations. In order to choose the right heater and fuses, you need to carefully study all the information when buying. And even the highest quality device must be checked periodically.
  • Scale formation or corrosion. Scale and corrosion on the reverse shutter can cause water leakage back to the pipeline or “corrode” various compounds, violating their tightness.

The most basic malfunctions can be divided into several types. Most often, the broiler starts flowing. This can be either a production defect or a crack acquired due to corrosion. Such a tank cannot be fixed independently, you will have to completely replace it. Water dripping from pipes speaks of their leak. From the safety valve, water, on the contrary, should sometimes drip. If it is always dry, then it should be replaced.

How to Test a Water Heater Relief Valve

The second common malfunction is most often the absence of heating. This is almost always due to the malfunctions of the heating device or thermostat. Sometimes an emergency cutter is triggered in this way, when the boiler is constantly turned on at the maximum temperature.

Often, when working a boiler, walls, perimeter of the outlet and the surrounding space can be heated. The most dangerous in this case is the heating of a fork or outlet. The reason may be poor contact or breakdown. If the water heater does not work on electricity, but from the gas network, then the chimney can clog with ice, which will close the output of a couple. In this case, it is quite easy to clean it.

If the water heater gives an insufficient amount of warm water, you need to check if the entrance and output nozzles are confused. And if hot water enters the kitchen crane with virtually no pressure, while the mixer works properly, it is necessary to check the safety valve. He can clog with rust or dirt, after it is cleaned, the pressure of the water will be restored.

A high.quality safety valve for boilers with a volume of not more than 200 liters installed on a standard household heater can last at least ten years. It is necessary to regularly clean it of sediment and check the performance of the entire system. Once every three to four years, it is advisable to dismantle it and wash it with special chemical solutions that can be purchased in household stores.

When installing, it is necessary to follow the above rules and conduct a high.quality check of the system with cold water under pressure. If there are any doubts about their own abilities, it is better to entrust such a responsible work to professionals. After all, not only property depends on quality work, but also the health of all residents.

About why you need to install a safety valve for a water heater and what will happen if it does not install it, watch in the next video.

How to install a valve

The discharge safety valve is installed on the supply line of cold water to the boiler in accordance with the recommendations:

  • Between the valve and the water heater, it is impossible to put shut.off valves, only an American to disconnect the pipe;
  • It is necessary to draw a hose from the safety valve to the nearest drain to the sewer;
  • For convenient emptying of the container between the valve and the water heater, you can mount a tee with a ball valve on the chalk. How to do this correctly, shows

    It is abnormal when it flows from the pipe all the time or never drips. The absence of drops may indicate a valve malfunction, therefore it is recommended to periodically force a little water with the help of the corresponding handle.

    There may be two reasons why the safety valve is constantly flowing:

    In the first case, the installation of a new valve will help. But to change it to a device with a higher threshold of operation will be an error, you will endanger the destruction of your electric heater or an indirect heating boiler. There are 2 ways: neglect and pay for excess water consumption or additionally install a reducing pressure regulator at the house input into the house.

    Safety valves protective functions

    In the process of heating the water in the storage tank of the water heater, its volume increases. In a closed system, according to the laws of thermodynamics, with an increase in the temperature of the substance, the level of pressure is growing.

    To control the value of the temperature of the water in boilers, manufacturers install thermostats and thermostats for manufactured products. If these devices are out of order, then boiling water in the tank will occur, which will lead to a tangible increase in pressure and even greater fluid warming up.

    The avalanche.like flow of the described process, in the end, will lead to the formation of a crack in the walls of the funded capacity through which some of the hot water will spill. The released place will be immediately filled with cold water coming from the tap system.

    This will lead to an instant boiling of the entire liquid in the tank, accompanied by a huge amount of steam and, as a result, an explosion of a container that bursts under its influence.

    The safety valve will not allow the pressure to exceed the permissible values ​​by dumping part of the liquid into the sewer system.

    In addition to ensuring the integrity of equipment in the event of critical situations, safety valves perform several more important functions, which include:

    • preventing the return of heated water from the boiler back to the water supply;
    • smoothing of the pressure of cold water at the entrance to the water heater tank, which prevents the possibility of hydrouches;
    • dropping excess fluid from the tank at the time of a critical increase in temperature and pressure;
    • providing the possibility of draining water from the accumulative capacity of the water heater for planned prophylactic maintenance and the necessary repair.

    Tankless Water Heater Valve Kit

    The valves that manufacturers currently produce can have a variety of design. The kit, along with the main product, may include pressure gauges, various locking valves, etc.

    safety, valve, water, heater

    When choosing a safety valve for a boiler, it should be taken into account that the purchased device must correspond to the parameters of the operating system of hot water supply in the house.

    The diagram clearly shows the device of the safety valve for the water heater (boiler), all the elements of which are equipped with signs with inscriptions

    How such a valve works?

    Boiler safety valve performs the functions and check valve, which is reflected in its design. Schematically, the product can be represented as two thin.walled cylinders located in relation to each other at a right angle, having different sizes endowed with the total working cavity.

    If you look inside the larger cylinder, you can see the check valve installed there, the design of which includes a plate, a spring and a saddle, which is in the case of the product. The threads applied on both sides of this part of the protective device allows you to attach it to the introductory pipe of the electric boiler.

    A locking device is also contained inside the smaller cylinder, similar in design described above, and differs from it only by the presence of a stiffer spring.

    Most models of safety valves have a function of adjusting the opening pressure produced by changing the degree of compression of the spring. The drainage hole is located directly behind the locking mechanism. It is recommended to connect a transparent tube to this hole that allows you to observe with water discarded from the tank.

    View from three angles to the design of the safety valve used when connecting the water.type water heating equipment

    The safety valve is valid for the following algorithm.

    • In the open position of the crane mounted on the introductory line, the water freely passes into the container through the hole resulting from pulling the check valve plate from the saddle. At the same time, the incoming fluid does not have access to the drainage hole, because the safety spring has rigidity designed for higher pressure compared to the water supply of this value.
    • At the time of complete filling of the boiler, the level of pressure in the tank and in the highway is aligned, which is why the check valve closes. An increase in the temperature of heated water in the funded capacity causes an increase in the pressure on a check valve plate, which is even tighter to the saddle. Therefore, heated water to the pipes of cold water supply can no longer return.
    • When users begin to spend hot water for household needs, the pressure inside the water heater begins to fall and reaches a value less than the water supply. At this moment, the plate is squeezed from the saddle and the process of filling the tank with water begins.
    • If the thermostat breaks down, then the uncontrolled increase in temperature will begin, which will cause an increase in pressure to a critical level. Here, as a result of compression of the safety valve spring, it will be possible to unnecessary liquid through the drainage hole into the sewage system through a transparent hose.

    A small lever is necessary for the forced opening of the drainage hole through which water is discharged and a decrease in pressure

    Problems: their causes and elimination

    Two types of problems are possible:

    • Constant leakage from the graduation pipe. This indicates excessive pressure in the water supply system. The problem is solved by installing the gearbox.
    • Lack of release of excess water at high pressure in the container. This means that the valve is damaged or designed for greater pressure. In any case, the device must be replaced by choosing a suitable model of the model.

    It is necessary to periodically check the performance of the device. Its replacement will cost much cheaper than repairing or buying a new boiler.

    What to do if it flows from the safety valve from the water heater, will tell

    Protection of the water heater from excess pressure is a mandatory element of the structure. All modern models of boilers are equipped with safety valves, but on old installations they may not be.

    It is necessary to choose the right model, guided by the indicator of the working pressure in the container. Installation is carried out in accordance with the instructions for the boiler disconnected and disconnected from the water.

    After installation, it is necessary to check the valve performance in order to immediately correct possible errors.

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