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 the water heater on the supply of cold water.
What is it needed for
Installation of the safety valve prevents pressure from increasing the instrument above the normative. What is the pressure rises? As you know, when heated water expands, increasing in volume. Since the boiler is sealed, excessive things to go there - the cranes are closed, the feed valve is usually worth the feed. Therefore, water heating leads to an increase in pressure. It may well happen that it will exceed the strength limit of the device. Then the tank rushes. So so that this does not happen, they put a safety valve for the water heater.
This is what the installed valve for discharge pressure in the water heater looks
It may not be necessary to put a safety valve, but simply remove the opposite? With a fairly high and stable pressure in the plumbing, such a system will work for a while. But the decision is rooted incorrect and that's why: the pressure in the water supply is rarely stable. Often there are situations where water barely runs from the crane. Then hot water from the boiler pressure to displace in the plumbing system. At the same time, the tagne is taken off. For some time they will warm the air, and then blown.
But blunt-haired Tanes are not the worst. It is much more worse if they are late, and at this time the pressure in the plumbing will rise sharply. Water evaporates on the hot heaters evaporates, there is a sharp increase in pressure - jerk - which leads to a guaranteed rupture of the boiler flasks. At the same time, a decent amount of burning water and steam, under large pressure escaped into the room. What it can threaten - understandable.
How does it work
The safety valve for the water heater would correctly be called the valve system, as they are in the device two.
Safety valve device for boiler
They are located in a brass or nickel-plated case, which has the appearance of an inverted letter "T" (see photo). In the lower part of the case there is a check valve that prevents the outflow of water from the water heater when the pressure is reduced in the system. In perpendicular branch, there is another valve, which, when exceeding the pressure, allows you to produce part of the water through the fitting.
The mechanism of work is as follows:
- While the pressure in the boiler is less than that, which is in the water supply (when filling or with an open crane), the plate valve plate is pressed by the flow of water. As soon as the pressure is leveling, the spring presses the plate to the protrusions of the case, overlapping the flow of water.
- With the heating turned on, a gradual increase in the water temperature occurs, and the pressure is growing with it. While it does not exceed the limit, nothing happens.
- When the threshold level is reached, the pressure squeezes the spring of the safety valve, the output to the stacker. Some of the boiler water is boiled through the fitting. When the pressure drops to a normal spring, the passage is locked, water stops flush.
Article on the topic: Heat-resistant Painting: Choose a protective and aesthetic coating for a fireplace and furnace
According to the principle of work it is clear that water from the fitting will constantly patch. This occurs when water is heated, with a decrease in pressure in the plumbing. If you periodically see water on the fitting, then everything works fine. But the merging fluid should be removed. For this, the tube of suitable diameter is put on the nozzle, be sure to fix it with a clamp. Normal working pressure boiler - from 6 bar to 10 bar. Without mechanical fastening, a tube will be thrown into two accounts, so the clamp pick high-quality, tighten well. Displays a tube to the nearest sewer drain.
Another point: The tube on the fitting is needed transparent and preferably reinforced (the so-called "Christmas tree"). Why reinforced persons - due to pressure, and transparent - to be able to control the operation of the device.
Types and varieties
If we are talking about conventional safety valves for the water heater, they look almost the same, only nuances differ. But it is these small details that are responsible for the convenience of operation.
Safety valve for a boiler with the possibility of forced pressure reset
In the photo above two safety valves with drilled levers. They are needed for periodic performance inspection. Flag lever raise up. He pulls behind the spring, freeing for the discharge of water. This check should be carried out about once a month. You can also empty the boiler tank - raise the checkbox and wait until everything is stealing.
The difference in the presented models is that the model in the photo on the left lever is fixed with a screw. This eliminates the possibility of a random discovery and full reset of water.
Two more differences are striking. This is an arrow on the body, denoting the direction of water movement, and the inscription showing the device is calculated for which pressure. It would seem insignificant details. But if you can figure it out with the direction of water movement (you can see in which direction the plate valve is deployed), then with a quantity it is more complicated. How to distinguish, for example, on 6 bar) or on 10 bar? Only checks. How will their sellers be distinguished? In no way. By boxes. And if you put not in that box? In general, without labeling on the case it is better not to take. These are usually the cheapest of the Chinese samples, but the price difference is not so great to stand risks.
Also pay attention to the form of the water reset. The model on the left is a long, a non-linear shape. It is quite easy to wear hose and lengths enough to install the clamp. The shape of the fitting at the model to the right is different - with an expansion by the end, but more importantly, the fitting is short. It is still possible to pull the hose on it, but the clamp is in question. Except to clip ...
Article on the topic: Blooming and ordinary cacti in the interior and care for them (36 photos)
In the following photo safety valves without a pressure discharge flag. That which is left, in the upper part has a threaded lid. This is served model. If necessary, you can unscrew the cover, remove the blockage, scale and other contaminants.
Safety valves - serviced and no
The model on the right is the worst of the options. No designation, forced reset or maintenance. These are usually the cheapest available, but this is the only dignity.
All models above are suitable for water heaters of up to 50-60 liters. Larger boilers go other models, many of which are built-in additional devices. This is usually a ball valve and / or pressure gauge - to control the pressure.
For boilers up to 200 liters
Fitting for resetting water here with a staff thread, so there will be no problems with the reliability of fastening. Such devices already have a fairly high price, but also the quality and reliability of them are much higher.
With manometer and original
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: linen palable or fum-tape is wound on the thread, after which the valve is screwed and the nozzle. Before the stop is twisted with your hands, then another one or two turns with keys. It is much more important to choose the right place to install it. When installing the water heater, this valve is installed directly on the pipe of the input of cold water.
Article on the topic: Team leakage. How to eliminate?
Installation example
Next may still stand the check valve, which is also called shut-off. But this is already reinsurance - the same device is available in the safety, and even often after the water meter at the entrance. Installation scheme is shown below. This is one of the normal options.
Safety valve installation circuit for boiler
The diagram has a ball crane. It is necessary for emptying the tank before conservation for the winter (at dachas) or before dismantling for prevention and repair. But more often put it on a tee, which is screwed directly on the inlet nozzle of the water heater. A safety valve is screwed at the tee, and a ball crane is put in the side removal.
Installing the safety valve after a tee
Actually, these are all normal options.
Breakdowns, reasons, elimination
In principle, only two breakdowns have a safety valve for the water heater: water or often flows or does not flow at all.
First of all, it must be said that water booming during heating is the norm. This is how the system should work. Water and when the boiler is disconnected, if the pressure in cold water supply pipes will be higher than the valve response limit. For example, a valve for a 6 bar, and in the plumbing 7 bar. While the pressure does not fall, the water will be watered. If this situation is often repeated, the installation of the gearbox is needed, and it is best on the water to the apartment or to the house, but there are compact models of gearboxes that can be installed at the inlet to the boiler.
Boyler strapping with safety valve and gearbox
How to check the condition of the valve? If there is an emergency reset lever to do it simple. Pi off the boiler need to raise the lever several times, pulling out overpressure. After that, the drops stop and not resumes until heating begins.
If water continues to drain, it may have clogged the spring. If the model is served, the device is disassembled, it is cleaned, after which it is placed in place. If the model is not collapsible - it is only necessary to buy a new valve and deliver.
So the gearbox looks like - to stabilize the pressure on the boiler
Constantly dripping water is unpleasant and "beats" on the wallet, but not dangerous. It's much worse if you have never appeared water in the nozzle. The reason - the valve clogged or the output fitting was clogged. Check both options. It did not help - change the valve.