Water pressure reducer is an important element of the heating system and water supply. In some cases, there may be a need for its regulation. Before you perform any work, you need to decide on the model of the device. So, some gearboxes are adjusted directly during production. To adjust the others, you may need a screwdriver or wrench. And the setup process itself has some nuances.
How to increase the pressure?
One of the common problems that homeowners are facing is lowering the pressure of the tap water, which causes the pressure to drop and the water starts to flow very slowly. To begin with, experts recommend determining the reason why this is happening.
The first step is to establish: did the pressure drop only in a particular faucet, for example, a kitchen mixer, or in all taps? In the first option, the reason probably lies in the clogging or breakdown of a particular device, industry experts say. In this case, you will have to clean the water supply elements or even change them on your own or by entrusting it with plumbing. But before starting this laborious work, it is recommended to check the taps that shut off the water supply. If they are not fully open, the water pressure will be lower than it should be.
It's not about the valves - then you need to check if there are any blockages in the system that interfere with the water supply. They can be in the following elements of the system:
- in the aerator
- a net at the end of the gander, which breaks a large stream of water into many small ones,
- inside the details of the crane itself,
- at the junction of the mixer with the hose.
If cleaning or replacing these items doesn’t help, it’s likely that the insertion point of the wiring into the riser is clogged or a thick layer of deposits has formed in the pipes, experts say. This is also the reason for the low pressure in all the taps in the house. Here it is not possible to fix the problem on our own - you need to contact the management company.
A radical way to increase the pressure of the water in the tap is to install an electric pump. But experts warn that the pump will increase the pressure, but will not increase the volume of water in the riser, which means that the pressure in the pipes of the neighbors will drop sharply.
How to reduce the pressure?
The reverse situation, when the water from the tap goes too hard, is also a problem - there is an excessive waste of water and money to pay for it.
The easiest way to avoid this, repairmen write, is to install a water pressure regulator, a special device that stabilizes the pressure in the system and maintains it at a given level. This allows you to protect pipes and taps from high loads and water shocks. This device is a mechanism in a metal case, which has an inlet and outlet threaded connection (i.e. is wound onto a pipe). This device is also equipped with a screw, which allows you to adjust the force of the pressure of water.
Those who do not use this method due to reasons of economy can use popular expert advice on how to lower the water pressure in the house without connecting expensive special devices. For example, install an aerator (mesh at the end of the tap), if it is missing, or replace it with a smaller one. You can also insert into the pipe at the site of its connection with the tap a fine mesh filter. A more radical way is to reduce the diameter of the hose that connects to the tap. But all these tips have a big drawback - the risk of clogging of pipes and faucet increases, which means that over time, the pressure can very much decrease.
By the way, experts warn that valves that block water cannot be used to reduce water pressure. They should be in only two positions: either completely closed or completely open. Leaving them partially closed is not worth it.
Pressure regulator: what is it?
The pressure regulator is a small device that is used to combat water hammer. Also, with its help, you can control and, if necessary, adjust the water pressure in a particular system. The use of this device allows you to optimize the work and increase the life of the engineering communications. Often, a pressure reducer is used on such objects:
- technological facilities
- residential buildings.
Devices used to adjust the pressure in the system are divided into dynamic and statistical products. The first type is used in trunk pipelines in industrial enterprises. They allow you to adjust the fluid flow in the systems. As for statistical products, they are installed in pipelines with an unstable water supply. That is why statistical reducers are used in multi-storey and country houses.
The pressure reducer simultaneously performs several functions. First of all, it is used to protect plumbing fixtures from high pressure. So, most plumbing and household appliances are designed to work when the water pressure in the pipeline does not exceed 3 bar. If this indicator is slightly higher, then the water supply system is under severe pressure. Subsequently, valves, connections and other elements of the system and plumbing fixtures suffer
Valtec pressure reducer VT.087
The gearbox is also used to combat water hammer, which can occur both in industrial enterprises and in residential buildings. As a result of a sharp jump in water pressure in the water supply, a hydraulic shock occurs, which can damage the structural elements of the system. There are cases when such a sharp jump led to the rupture of the boiler. Therefore, experts recommend installing a gearbox, as it will prevent the occurrence of such problems. It is very important to consider the installation in the water supply system of the apartment.
A pressure reducer is widely used in homes where the pressure of cold and hot water constantly jumps. Adjusting the water pressure regulator in the apartment will solve this issue once and for all. Also, lowering the water pressure in the apartment will reduce its consumption by 25% or more. Details how to choose a water pressure reducer.
Many owners are wondering how to adjust the water pressure regulator in the apartment. This task can be easily done by yourself. Most devices come with a predefined setting. According to this, the pressure in them is 3 bar. But, if necessary, you can reduce or increase this parameter yourself.
Disassembled water pressure reducer
You may need a wrench or a wide screwdriver to complete the adjustment. The choice of tool depends on the gearbox model. Of course, in modern devices, tuning is done manually without using any additional tools.
First of all, you need to make sure that the water pressure reducer in the water supply is securely installed. After installation, the device opens the water supply. At this stage, you need to check the system for leaks. To prevent such problems from occurring, it is worth using sealing material when installing the gearbox.
Adjustment of the water pressure reducer in the apartment is carried out with closed taps. At the bottom of the device there is an installation head, which is responsible for adjusting the pressure of the liquid in the pipeline. If the pressure needs to be increased, then the head rotates clockwise. Otherwise, the rotational movement is performed counterclockwise.
One full rotation of the head allows you to change the pressure by 0.5 bar. This will be noticeable by the movement of the arrow. Thus, the adjustment of the water pressure regulator in the apartment is performed. The work can be easily done by yourself.
But how to adjust the water pressure in the apartment, if there is a budget gearbox that does not have a pressure gauge. There are several ways to resolve the issue:
- The first option involves the temporary installation of a pressure gauge in the system, which will accurately determine the pressure value. After the adjustment of the water reducer in the apartment is carried out, the measuring device is dismantled and a plug is put in its place.
- The second option is easier to perform. There is no need for installation and further dismantling of the measuring device. The adjustment is carried out exclusively by eye. After several head rotations, you need to open the mixer and visually appreciate the pressure force.
The disadvantage of the second method is that it is not possible to establish the exact value of the pressure. In the future, this may cause malfunctions in the operation of household appliances and plumbing. The fact is that there is a norm of cold water pressure in the apartment at which plumbing fixtures work normally. But, if the pressure is too high or low, this will lead to a violation of the rules for their operation
Water Pressure Regulator Diagram
Often there are cases that the pressure in the water supply drops, the filter is clogged or the water pressure regulator at the entrance to the apartment is oxidized. To solve this problem, you can lightly tap the case or take a socket wrench and turn the adjusting screw.
In connection with such features, experts recommend taking the choice of device seriously. It is best to pay attention to modern models, which include a control and measuring device and are easy to adjust without the use of additional tools. Among the popular brands it is worth highlighting “Honeywell”, “Watts”, “Officine Riqamonti”. It will also be useful to install a filter that will protect the gearbox from clogging and thereby extend its service life.
Water pressure regulator in the water supply system
Advantages of a water pressure regulator. The need for a device is to stabilize the pressure and reduce water consumption in distribution, central water supply systems and autonomous systems. To supply cold water, it is used:
- in pipelines for utility and technical purposes,
- in water fire extinguishing networks,
- at the central water supply in pumping substations,
- at refueling facilities,
- in irrigation and land reclamation facilities.
Structures of this type are installed behind the water meter assembly at the entrance to the building, or behind booster pumps. Regulators unequally monitor the pressure of the liquid in the water supply system, as well as to the place of their placement, depending on the model.
When installing a device having a rather large diameter, it is recommended to mount a filter for rough cleaning of the liquid. Behind the device, a shut-off valve is required, which is necessary during the technical inspection, and the replacement of the device.
Adjustment of the regulator and control of its activity is carried out using pressure gauges, which are placed on the water supply in front of the device and after it. According to its technical characteristics, the regulator is classified into the following categories:
- a working element in the form of a piston or valve,
- a membrane or spring as a working mechanism,
- control method - mechanics or electronics,
- throughput or operational capacity, which is divided into industrial (from 16 cubic meters), commercial (from 3 to 15 cubic meters) and household (up to 3 cubic meters), a housing that can be steel, cast iron, brass, nickel or chrome plated,
- mounting option - flanges or thread,
- technical mode and type of working environment,
- by housing size, standardization of flanges.
When choosing a device, it is necessary to take into account the flow rate of liquid per hour, measured in cubic meters (throughput) and the ability to lower the pressure in the housing (unit of account is bar).
Emerging local resistance should not significantly affect the activity of the entire water supply system. The adjustment regulator is connected with a sensitive membrane, the quality of which depends on the material of manufacture, with the compression ratio of the spring.
If the manufacturer has provided one spring, then the tuning range will be one. If there are several springs of different stiffness, the device responds to changes in operating conditions more accurately. During operation, the controller makes a noise that is generated due to cavitation resulting from the excess of the optimal pressure head at the inlet to the device.
The normal rate of water movement is 3 m / s. With a narrow bore, the possibility of cavitation in the housing increases. When purchasing a device, one should take into account the cavitation coefficient and the speed regulated at the input. This information is indicated in the passport for use.
Devices can be:
- lever or flange
- household, to regulate the RDF fluid,
- electronic, direct action,
- measuring water pressure "Honeywell".
Lever and flange devices are equipped with a hydraulic lever that maintains the desired pressure and regulates its differential. Such a regulator consists of a housing (steel or cast iron), a cover with a membrane. Lever devices set "before" and "after", and they differ in the position of the working body and the saddle.
After the location of the device, position the gearbox, which opens the passage under the influence of the load. In front of the installation site, the device is placed to reduce the pressure. It closes the passage, also under the influence of the load. Household gear reduces pressure, noise, reduces vibration and increases the life of hydraulic equipment.
Also, installation of the device helps to reduce water consumption. The direct-acting WFD measuring water pressure has a flanged valve. His method of work is based on maintaining optimal pressure, or reducing it, using the energy of the total flow.
The system consists of a housing that is equipped with flanges at the outlet and inlet, rod and guide bushings. In addition, the device consists of a main and initial valve located on the housing, a membrane mechanism, and impulse tubes.
If in the water supply the pressure rises above the set, then due to pulses, the water will be directed to the body of the initial valve, where, under the influence of a special mechanism, its pressure decreases. The electronic device is equipped with a low-power pump for the selection of liquid from the pipeline.
When working, it does not make noise, it is most often installed in apartments and individual houses. Thanks to the electronic element, the pump stops moving in the absence of liquid, water hammer is prevented, a reaction to the occurrence of incorrect values of fluid consumption and pressure occurs.
The device is mounted vertically, and this is the correct, working position. On the body are arrows that indicate the direction of fluid flow. As part of the electronic model, there is a sleeve made of technological polymers that allow you to connect a cable, an internal diaphragm, a housing, a cover, an electronic board located in a protective case.
The manufacturer has already set the initial pressure in the unit (1.5 bar). If necessary and when changing the operating conditions of the pump, adjustments can be made to the configured data. In this case, it should be borne in mind that the initial pressure data should be 0.8 bar, lower than the nominal.
By installing a device that controls the pressure of the liquid in the room, it is possible in an affordable way to improve the quality of its supply. In individual houses or apartments, a device with a throughput of 3 cubic meters per hour is enough.
- the automatic valve is located in a warm and accessible place,
- the housing must be protected from any pressure from the side
- the arrow on the device must coincide with the flow direction,
- Before installing the device, the pipes must be cleaned of scale, silt and dirt,
- installation of a mesh filter can improve the operation of the device
- installation of the valve (shutoff valves), is needed for technical inspection and replacement of the device.
The household appliance optimizes the pressure and flow of fluid in the water supply. There are pressure regulators on sale, significantly different in cost. The price range depends on the brand, country of manufacture and configuration.
The minimum cost is from 600-700 rubles, the maximum can reach up to 10 thousand rubles. Domestic devices are cheaper than imported ones. They often do not have any design, and are not always comfortable to use, unlike foreign counterparts, but they are not inferior to them in terms of quality characteristics.
Among foreign regulators, the cheapest are Chinese-made appliances, compared to European models. For budget models, a lower range of outlet pressure adjustment is often observed. published by econet.ru
If you have any questions about this topic, ask their specialists and readers of our project here.
Do you like the article? Then support us press:
What it is?
Pressure regulators are devices that serve to reduce and maintain water pressure to a predetermined outlet value, regardless of flow. Такие устройства еще называют клапанами понижения давления или редукционными клапанами.
Устройства предотвращают негативное воздействие значительных колебаний давления воды на вводе в систему и гидравлических ударов. This is especially true in the conditions of modern urban development, in the vicinity of buildings of different heights and taking into account the uneven terrain.
What are they needed for?
The task of the water supply system is to supply water from the pumping stations to the highway under high pressure. When water enters subscriber networks, its pressure drops to a level that must comply with the approved standards and range from 4 to 8 atmospheres.
Maintaining normal water pressure in the apartment is a very important condition for the trouble-free functioning of water pipes, heating systems and household appliances, such as boilers, washing machines, dishwashers, and so on.
To reduce the water pressure in the water supply system, experts recommend integrating pressure reducers into it. Their purpose is to protect against water hammer and maintain a stable pressure in the system.
The water pressure corrector works without the addition of electromechanics and automatically regulates the water supply. Its ability to function at low temperatures or high in heating systems and hot water supply is determined by the value of operating temperatures and their range.
So, main reasons the need to install regulators:
- high water pressure at the entrance to the building,
- water saving
- a guarantee of constant outlet water pressure, even in the case of significant fluctuations in the inlet pressure,
- water hammer protection,
- reduction of noise caused by water flow.
Another case of the use of regulators: if common booster pumps are installed in the water supply systems of multi-storey buildings, but at the same time, it is necessary to ensure the presence of zones with different pressures. For example, increased water pressure is necessary for fire hydrants.
Also in high-rise buildings there is a need to balance the pressure on all floors, so it is advisable to install a pressure regulator on each of them.
Do I need a gearbox in front of the boiler?
Water hammer, or water hammer, appears due to an instant change in the movement of water inside the water supply. A common consequence of water hammering are high pressure burst transition hoses. Its manifestation is also characteristic of the destruction of pipes weakened by rust and the breakdown of weak plugs.
With the boiler running, water hammer is very likely to cause the tank to rupture.
A conventional boiler is designed for incoming water pressure up to 4 atmospheres - then its service life will be higher. When the pressure in the pipes exceeds 7-8 atmospheres, a safety check valve is activated, which releases water from the boiler into the sewer.
One of the reasons for the constantly dropping safety and non-return valve of the boiler can be excessive water pressure (more than 8 atmospheres) at the inlet. Increased pressure in the pipes can occur not only because of the failure of the temperature sensor, but also through the fault of the water utility, because water can be supplied to the apartment with a pressure of more than 10 atmospheres.
Especially often this is observed in multi-storey buildings on the lower floors at night.
Analysis of boiler failure statistics showed that about 70% of all breakdowns were associated with a sharp pressure drop, hydraulic shocks and prolonged vibrations.
If the pressure reducer is not installed at the entrance to the apartment, in front of the boiler installation will be required.
The pressure reducer connected at the inlet to the boiler will become a guarantor of protection against water hammer and of the pressure relief valve flowing due to the increased pressure.
Regulatory Requirements for Apartment Pressure Regulators
Unbalanced pressure drops in the risers of hot and cold water lead to a change in the temperature setting of the mixed water at the spout of the mixer. Many probably faced this fact, when the comfortable temperature of the water in the mixer suddenly began to change sharply, either towards boiling water, or to absolutely cold water.
The presence of pressure regulators on the apartment inputs will allow to get rid of such an unpleasant phenomenon. The domestic regulatory framework governing the requirements for household water pressure regulators is currently represented by the following basic documents:
- GOST 55023 Room pressure regulators. General specifications
- GOST 12678 Direct pressure regulators. Main settings.
- Guidelines for the selection and use of apartment pressure regulators in residential and public buildings (Scientific Research Institute of Plumbing).
The main requirements for gearboxes set forth in the listed documents are presented in the table:
Conditional throughput, not less
1.6 (GOST R 55023)
Throughput in the working range of input pressures, not less
Throughput at inlet pressures below the operating range, not less
Inlet pressure range
Operating range of expenses
Maximum outlet pressure in the operating range of expenses, no more
Maximum outlet pressure in non-flow mode, no more
Change in pressure with a change in flow rate of 0.05 l / s in the operating range of flow rates, not more than
Noise level at a distance of 2 m from the device
Bending moment on the body, not less
Ambient temperature range
Permissible ambient humidity
Medium Temperature Range
The principle of operation of apartment pressure regulators is based on balancing the forces created by the inlet and outlet pressures due to the ratio of the areas affected by these pressures.
Inlet pressure Pvc acts on the small piston, trying to open it. Due to throttling in the spool associated with the small piston, the pressure decreases to Out. This reduced pressure acts on the large piston, trying to close the spool.
The large piston spring keeps the spool open when the inlet pressure is lower than the set pressure. Instead of a large piston, a membrane can be used.
The simplest in construction and the cheapest, and, consequently, the most common. They contain a spring-loaded piston that overlaps the cross section of the pipeline, thereby adjusting the outlet pressure. The usual adjustment range is from 1 to 5 atm.
The disadvantage of such controllers is the presence of a moving piston, which determines the requirements for preliminary filtration of water at the inlet of the gearbox, as well as limiting the maximum flow rate, leading to increased wear of moving parts.
Provide adjustment using a spring-loaded membrane installed in a separate sealed chamber and providing the opening and closing of the control valve.
Such gearboxes are characterized by high reliability and unpretentiousness, a large range and proportionality of pressure control, as well as a large variation in the working flow rate, ranging from 0.5 to 3 cubic meters. m / h Also distinguished by a higher cost.
Provide dynamic pressure control due to the internal labyrinth located in the housing and reducing the flow rate by its separation and numerous turns. They are mainly used for irrigation and irrigation systems.
Due to the absence of moving parts and the use of plastic materials for their manufacture, they are distinguished by a low price, however, they require the installation of an additional regulator or valve at the inlet. The working range is from 0.5 to 3 atm.
The installation of pressure regulators is not recommended to be carried out independently, since it requires certain knowledge and skills. Consider the scheme for connecting pressure reducers to the apartment's water supply system.
- mechanical coarse filter,
- check valve
- DHW and cold water meters,
- wash filter
- Pressure reducer.
Installation of gearboxes is carried out in the cold and hot water supply of the apartment. It is preferable to install pressure reducers in the horizontal section of the pipeline, but installation on the vertical is also allowed. To ensure trouble-free operation of the gearbox, a mechanical cleaning filter must be installed before it.
The gearbox is usually mounted behind a water meter. Behind the gearbox, a pipeline of the same diameter with a length of 5xDu should be provided. To enable adjustment and maintenance of the gearbox, shutoff valves are installed behind it. If safety valves are provided in the system, the set pressure at the gearbox outlet must be 20% lower than the opening pressure of the safety valves.
The set of rules for water supply and sewerage states that the installation of pressure regulators should be carried out immediately after the shut-off valves at the inlet, that is, before the metering devices.
This sounds good, because in this case the gear will protect all hydraulic devices, including a meter and a filtration unit.
But when installing to the metering unit, any possibility of water intake should be excluded, which means that technical plugs for washing the filter and rod will be sealed, and the gearbox itself will lose the possibility of maintenance.
This can be neglected, but even in this case it is very difficult to provide different hydrodynamic drag and achieve equalization of pressures in the collectors of cold and hot water. You need to either install additional pressure gauges in them for more precise adjustment, or have pressure regulators in front of the manifolds, as most experienced plumbers do.
Example of water distribution with gear
If it is not possible to install at the system inlet, but some components require protection against excessive pressure, local installation is also possible. There are quite a few primitive models of gearboxes for 20 mm pipe threads, and even without fine tuning they fully cope with their protective function.
Sources: mos-santeh.ru, www.rmnt.ru
Maintenance and Setup
Most regulators are available with a predefined setting, the pressure in them is 3 bar. If you want to reduce it or, conversely, increase it, you can easily do it yourself. Depending on the gearbox model, you will need a wide screwdriver or wrench. In some, more expensive brands, the adjustment is carried out without additional tools, by hand.
Make sure that the pressure regulator is securely installed, there is water in the system, and all taps are closed in the apartment. Locate the mounting head at the bottom of the gearbox and slowly begin to adjust.
If you want to reduce the pressure, you need to turn it clockwise, if you increase it, counterclockwise. One turn changes the gauge value by about 0.5 bar, you will immediately notice the movement of the arrow. That, in fact, is the whole setup.
But what if you have a budget gearbox without a pressure gauge? It is best to lend a manometer for a while, make adjustments, then unscrew and replace the plug. Or be content with the “by eye” setting, observing the jet from the mixer.
Water pressure regulators do not require any special maintenance. From time to time it is necessary to clean the gearbox seat and filter screen. In the event of a failure, a replacement piston or diaphragm will be required.
All elements of the equalizer are removable, the device body remains in place. For this, shut-off valves are needed before and after the device - so that by shutting off the water supply in the apartment, you can safely replace the necessary parts.
A faulty gearbox usually does not allow water to pass through at all or simply does not reduce pressure, which can be seen only with the pair installation of pressure gauges or the presence of a drawdown to the gearbox. Maintenance of the device consists only in flushing the mechanism and the built-in filter.
If this does not help, there is a mechanical malfunction or the influence of time. However, the entire mechanism of the regulator is clearly visible when removing the stem.
Failure may result in a burst spring, wear on the piston or diaphragm. Not all spare parts can be found on sale, but if there is one or a donor, replacement will not cause difficulties due to the availability of the main gear mechanisms for maintenance.
Sources: ecoblog.pro, chudovanna.ru, rmnt.ru
Criterias of choice
When selecting this device, first of all, you should pay attention to these features:
- System performance. How many cubic meters per hour she passes.
- Type of connection. Mostly threaded connectors.
- Type of adjustment. With a wide range of gearbox capacity changes or with a small one.
- Temperature range of the working fluid.
You should also decide whether to take a water pressure reducer with or without a pressure gauge.
The first option, of course, is preferable, because you can observe changes in the system in real time.
The most common material for gearboxes is brass. This alloy has many advantages that significantly increase the life of the device. Thus, you can not be afraid that the gearbox will quickly fail if properly installed.
Today, buying a water pressure reducer is not a big problem. The main thing is to choose the right device in accordance with the parameters of the water supply or heating system.