Water pressure regulators. What are the water pressure regulators and how to install them correctly

This section presents the supplied automatic liquid flow regulators (water, oil products, etc.)
URRD-3- universal flow and pressure regulator. Execution "NO" - normally open (regulation "after itself"), Du URRD-25,32,50,65,80mm (8-80 m3/h); up to 150C, 1.6MPa.
URRD-2- universal flow and pressure regulator Du-25-150mm (similar to URRD-3 and outdated URRD-M).
RR-25…100- water flow regulator (DN - 25mm, 40mm, 50mm, 80mm, 100mm).
RRMK-5— liquid (oil) flow regulator within a given pressure drop.
RRJ- high pressure fluid flow regulators.
RR-NO— direct action flow regulator (differential pressure) normally open. PP-HO works without an external source of energy, designed for automatic maintenance given pressure or differential pressure of liquid, gaseous and vaporous media. Du PP-NO-25, -32, -40-50, -80, -100 mm, pressure up to 1.6 MPa (water, gas, steam, air). Mounting dimensions of flanges according to GOST 12815-80. The principle of operation of the PP-NO regulator is based on balancing the elastic deformation force of the adjustment spring with the force created by the controlled medium on the membrane unit.
VRPD-FN-NO Direct-acting differential pressure regulator VRPD-FN-NO with a fixed setting (FN) normally open (NO-“after itself”) flanged (cast iron). DN-15 20 25 32 40 50mm, up to 16MPa, dP up to 0.3MPa, setting from 0.05MPa, medium-water Tees up to 150°С, UHL4.2 (Tos +1+40°С, humidity up to 80%) . SHMV
WRPD-NO Direct-acting differential pressure regulator VRPD-NO normally open (NO-“after itself”) flanged (cast iron). DN-15…150mm, up to 16MPa, dP up to 0.3MPa, setting from 0.05MPa, medium-water Tees up to 150°C, UHL4.2 (Tos +1+40°C, humidity up to 80%).
VRDD-NZ Direct-acting pressure regulator VRDD-NZ normally closed (NC - “after itself”) flanged (cast iron). DN-15…150mm, up to 16MPa, dP up to 0.3MPa, setting from 0.05MPa, medium-water Tees up to 150°C, UHL4.2 (Tos +1+40°C, humidity up to 80%).
VRDD-01-P-NZ with “bypass” function Direct-acting pressure regulator VRDD-01-P-NZ with “bypass” function normally closed (NC - “to itself”) flanged (cast iron). DN-15…150mm, up to 16MPa, dP up to 0.3MPa, setting from 0.05MPa, medium-water Tees up to 150°C, UHL4.2 (Tos +1+40°C, humidity up to 80%).

Other types and brands of fluid flow regulators can also be supplied.
In addition to the above liquid flow regulators (PP), we recommend that you familiarize yourself with the following types of PP:
a) RR of thermal energy (for example, RRTE-1, etc.).
b) RR air (for example, RRW-1, etc.).
c) PP gas (for example, RRG-1, etc.).
d) Process meters-regulators (secondary control devices that perceive unified output signals from differential pressure sensors (differential pressure gauges-flowmeters such as Sapfir-22M-DD, Zond-10DD, AIR-DD, DMER-MI, DM 3583M and others), suitable for complete with a root extraction unit for measuring flow by the method of pressure drop on standard narrowing devices (diaphragms - DKS, DBS).
For details, see the PRESSURE section, subsections: Differential pressure gauges and Transducers (sensors) of pressure difference.

PURPOSE, OPERATING PRINCIPLE AND MAIN VERSIONS OF LIQUID FLOW REGULATORS

Liquid flow regulators are designed to automatically maintain a given flow rate, liquid (including gas- and steam-containing) media that are non-aggressive to regulator materials under operating conditions. Regulator housings are usually made of gray cast iron, cast steel, or corrosion-resistant castings. Mounting dimensions of flanges are made in accordance with GOST 12815-80.
Variants of execution of regulators of an expense: "NO" - regulation of pressure "after itself".
The principle of operation is based on balancing the elastic deformation force of the adjustment spring with the force generated by the controlled medium on the membrane assembly.
Regulators are used in industrial installations, heating points, water supply systems and other objects in accordance with their technical characteristics.
The device can be equipped with a filter of the appropriate diameter, counter steel welded flanges.

The most common regulator models have:
Nominal diameters DN (DN) = 25, 32, 40, 50, 80, 100 mm.
Nominal pressure PN (Ru) up to 1.6 MPa (16 kgf / cm2), but higher values ​​are possible.
Medium temperature up to 180C.

Concepts, definitions and additional information about direct acting pressure regulators (RDPD)

Schematic diagrams for switching on pressure regulators (hereinafter RD-NO / NC) and differential pressure - flow (hereinafter PP-NO):
a) RD-NO - assembly "NO" - Normally Open Taxiway; pressure regulation "after itself" (bypass mode).
b) RD-NZ - assembly "NZ" - Normally Closed RD; regulation of pressure "to itself" (bleeding mode).
c) RR-NO - assembly "NO" - Normally Open RR; regulation of differential pressure (RPD) - flow (assembly "NC" in RPD-RR does not happen, because they are "flow" flow control devices).

Pressure regulators (hereinafter RD) direct action (RDPD) VRDD-NZ, bypass VRDD-01-NZ and direct acting differential pressure (flow) regulators (RPPDD) WRPD-NO are used to automatically maintain the required pressure or pressure difference (DD) of water in pipelines for various purposes by changing the flow rate, including (opening and closing) pipelines of heating systems (CO) and hot water supply (DHW).

With a certain connection scheme, differential pressure regulators (RPD-NO) can be used as flow controllers (PP-NO).

Direct-acting RDs are control devices for which the pressure of the flowing medium supplies the energy needed to reset the control valve. The RD is controlled by means of a hydraulic membrane actuator (MIM), in the working chambers of which pressure is supplied through impulse tubes from various sections of the pipeline (before/after the RD).

The effect on the flow is expressed in a decrease or increase in pressure depending on the type of taxiway and circuit diagram object.

The maximum allowable pressure drop on the RD is 0.4 MPa. To increase the service life of products and reduce the noise level, it is recommended that the pressure drop on the RD be no more than 0.2 MPa.

Pressure regulators (RD) and differential D.-flow (PP) water regulators are designed for use in systems for automatically regulating the flow of thermal energy for heating, hot water supply - hot water supply, ventilation, systems for supplying cold and hot water and other production and technological processes.

RD-NO/NZ and RR-NO are installed in individual heating substations (ITPs) of residential and industrial buildings, central heating substations (CHPs), boiler houses, CHPPs, pumping stations and other facilities that produce, distribute or consume heat energy, and also on which the preparation, distribution or consumption of cold or hot water of cold water and hot water systems is carried out.

RD water (VRDD-NZ, VRDD-01-P-NZ) and RR (flow-pressure drop. VRPD-NO), when properly applied, are successfully used to combat such negative processes in pipelines as elevated level noise, vibration, airing, increase or fluctuation (jumps, water hammer) of pressure not provided for by the normal operation of the facility.

Advantages of VRPD-NO differential pressure regulators

- small dimensions compared to the RPD of most other manufacturers;
- protection of the membrane from damage in case of improper pressure supply;
- a bearing is installed under the adjusting nut, which greatly facilitates the adjustment process; when adjusted to small differential pressures, the nut can be turned by hand without wrench;
— a slotted filter is installed in front of the holes in the plunger for water inlet into the unloading chamber located above the piston to prevent pollution of the unloading chamber;
— parts in contact with the working medium are made of materials resistant to hot water;
– high quality of surfaces of parts in contact with the working environment, which is ensured by processing on high-precision CNC machines manufactured in the USA and South Korea;
— use of membranes and sealing rings made in Germany;
- several values ​​of nominal capacity - Kv for one nominal nominal diameter - DN;
at the request of the customer, regulators with non-standard Kv values ​​are manufactured;
— regulators are supplied with wide adjustment ranges: (0.04-0.7) MPa or (0.2-1.2) MPa;
– the possibility of using differential pressure regulators as “downstream” pressure regulators;
— production of a wide range of regulators DN 15…DN 150;
— the ability to install in any position: on horizontal, vertical and inclined pipelines, with the adjuster up, down, to the side, in any direction;
— threaded connections, which are in the working environment, are stopped by a high-temperature sealant, which prevents the possibility of self-unscrewing of parts during operation;
- the design of the seats of the sealing rings excludes the possibility of their falling out or biting during the operation of the RPD.

Complete set and additional equipment of pressure regulators of direct action (RDPD)

Types of additional equipment and the composition of the set of mounting and connecting parts (KMCh / KCh Du15 ... 150mm) primarily depends on the mounting design of the direct-acting pressure regulator (hereinafter referred to as RDPD), while the following main industrial versions are distinguished:
- Threaded (coupling): fastening through a special set of connectors (cap nuts ("American") with a flange-threaded fitting, used on pipelines of small diameter nominal diameter (DN-10, 15, 20, 25, 32, 40mm);
— Flanged: mortise - VRPD has its own flanges already welded to the body, made in accordance with the requirements of GOST, installation is carried out to the mating flanges of the pipeline through gaskets using fasteners (bolts / studs, nuts and washers).
— Wafer(Sandwich type connections when the mortise VRPD does not have its own flanges and is clamped (pulled together) by pins into the pipeline connector between the mating flanges).

Types of add. equipment and accessories:
— Sets of mounting and connecting parts (KMCh / KCh): connectors, fasteners, sets of mating flanges ("KOF" according to GOST 12820-80, 12821, etc.)
— Seals and fasteners(gaskets, bolts (studs), nuts, washers).
— Filters(In order to prevent solid particles from entering sealing surfaces and moving parts, it is recommended to install a strainer upstream of the pressure regulator coarse cleaning).
— Pipeline elements: taper transitions from DN1 to DN2, straight sections (connecting sections) and other elements and welded parts.
Flange connection is regulated by GOST 12815-80, GOST 12820 or GOST 12821.

Additional equipment for control units, regulation and metering of pressure and flow (URR and heat energy metering units (UUTE)):
- Pipeline accessories: assembly and stop valves: taps, valves, gate valves, connecting fittings, tees, drains; coarse protective mesh filters, mud collectors, etc. - see add. equipment and fittings for flow control devices.
— Mounting cabinets, instrument panels, beds and racks.
— I&C: calculators, pressure gauges, differential pressure gauges, thermometers, thermomanometers, relay sensors, signaling devices, temperature converters (thermal converters) and pressure, regulators, power supplies (sources), control units and other devices and automation units.

At the request of the consumer, the following documents can be sent: order card (form) (questionnaire), passport of the pressure regulator (RD) and flow rate (RR) of direct action (RDPD), certificate of conformity, type approval certificate, application permits, declaration of conformity, technical description and operating manual, as well as other permits and regulatory documents (GOSTs, SanPiN, SNiPs, etc.).

Copyright © 2015-2017 all rights reserved,
the text is encrypted, copying is tracked and prosecuted;
author - DV, ed. - FMV; co-authors VOG/VEM, KTs-M0/P0.
GK Teplopribor - production and sale of instrumentation and automation: Pressure regulators (RD) and differential - flow (RR) direct action (RDPD) for closed and open water and steam heat supply systems (SO / DH), water supply (DHW, cold water) and regulation of other technological processes.
See technical description/characteristics of RDPD, price list (wholesale price), order form (how to choose, order and buy) pressure regulator (RD) and differential-flow rate (RR) of direct action (RDPD-NO/NC) at the manufacturer's price in availability and on order from a warehouse in Moscow, delivery/shipment of shopping malls (Business Lines and others) throughout the Russian Federation (for other information on ordering, see the official website of Teplopribor Group of Companies).

We will be glad if the above information was useful to you, and we also thank you in advance for contacting any of the representative offices of the Teplopribor group of companies (three Teplopribor, Teplokontrol, Prompribor and other enterprises) and promise to make every effort to justify your trust.

V. Vasilchenko, cand. tech. Sciences, art. Researcher,
V. Sobolev, head of the technical department of CJSC "HydraPack Holding"

The working bodies and actuators of mobile machines and mechanisms with a hydraulic drive used in industrial and civil construction, in the repair and maintenance of roads, in logging production, in public utilities, etc., are driven by hydraulic cylinders or hydraulic motors.

Fluid management

To change the speed of movement of the rods of double-acting hydraulic cylinders or the rotational speed of the drive shafts of reversible hydraulic motors, hydraulic devices are used that control the flow of working fluid (LF), which, depending on the properties, are divided into two main designs: throttling and regulating.

Throttling hydraulic devices designed to create hydraulic resistance to flow by throttling the RJ flow rate, which in turn depends on the pressure loss. Throttling hydraulic devices include flow synchronizers (flow dividers and totalizers) and unregulated and adjustable hydraulic throttles, including those with or without a check valve.

Regulating hydraulic devices are designed to maintain the set flow rate regardless of the pressure drop values ​​in the inlet and outlet flows of the RJ. Regulating hydraulic devices include two-line flow regulators with a variable outlet flow rate and with stabilization depending on the RJ temperature and three-linear ones with a variable outlet flow rate with excess flow discharge to another hydraulic line or to a hydraulic system tank.

Most throttling hydraulic devices are local hydraulic resistances, in which the change in flow rate depends on the flow area due to pressure loss P due to flow deformation RJ.

Throttle regulation

With throttle flow control (usually in circuits with constant flow pumps), the speed of movement of the actuators is regulated by changing the flow area of ​​the throttles. In this case, three main schemes for installing a throttle in the hydraulic system are used: at the inlet, at the outlet and in the branch (Fig. 1).

When analyzing hydraulic systems, it was found that with throttle control, the flow rate varies depending on the pressure created by the external load. Accordingly, the speed of the actuator and Δ R also depends on the external load and on the shape and length of the throttling gap: conical choke, longitudinal groove of a triangular or rectangular shape, slotted choke or annular choke.

Throttle speed control schemes are ineffective due to large power losses, especially when operating high-power hydraulic drives. However, throttling flow control is simpler and cheaper, therefore, to drive machines of low power or a drive that is rarely turned on, for example, to soft start and stop a machine, throttling control is often used, in which part of the RJ merges into the tank, and its energy is converted into heat, heating the RJ in hydraulic system.

On fig. 2, a, b shows the symbol and longitudinal sections of two-line adjustable throttles designed for embedding in hydraulic system pipelines.

These adjustable throttles with a conical locking element of cartridge design are designed to control the flow of RJ in both directions. A typical application is to control the speed of hydraulic cylinders and the speed of hydraulic motors. Regulated throttle type 2CR30 has a built-in non-return valve that freely passes the RJ flow in one direction, but with flow throttling in the opposite direction. By rotating the locking element, it is possible to change the flow area of ​​the throttle and adjust the RJ flow approximately in proportion to the threads, and also use the throttle as a shut-off valve. On fig. 3 shows the symbol and general views adjustable chokes with check valves.

These adjustable chokes are used for throttling the flow in one direction and free flow in the opposite direction. Chokes have two throttling spools with adjusting screws and two check valves built into the body. The RJ flow from the pump passes at low pressure through the check valve from the inlet V to the hole R connected to the hydraulic motor (see graphic designation). Reverse flow of RJ from R to V passes with variable throttling, depending on the regulation by the throttling spool. Examples of the use of adjustable throttles in typical hydraulic circuits are shown in fig. 4.

Flow regulators

These devices are used to maintain a constant flow regardless of pressure changes. The principle of operation of the flow regulator is shown in fig. 5. The flow regulator consists of the following main elements: a metering throttle 1 and a pressure compensator 2 with a spring 3. A change in temperature and, accordingly, the viscosity of the RJ changes the pressure drop. To reduce the influence of these factors, a special shape of the throttling gap is used.

The type of flow regulator depends on the design of the pressure compensator. If the pressure compensator is located in series with the metering throttle, the hydraulic unit is a two-line flow regulator, if in parallel - a three-line flow regulator.

In two-way flow controllers, the dosing throttle and pressure compensator are arranged in series. In this case, the pressure compensator can be located before the throttle at the inlet (Fig. 6, a) or after it at the outlet (Fig. 6, b). On fig. 6, a, it can be seen that the control slot A1 and the dosing slot A2 are arranged in series. The compensator spool is loaded on the right by pressure P2 and on the left by pressure P3 and spring force FF.

The pressure drop across the adjustable throttle in a two-line flow regulator is the ratio of the force of the adjustable spring of the pressure regulator FF to the end area of ​​the spool AK and does not depend on the sequence of the pressure compensator: before the throttle or after it.

On fig. 7 shows the symbol and principle of operation of a two-way flow regulator with an outlet pressure compensator. From fig. 7b it can be seen that the metering throttle and the pressure compensator of the two-line flow controller are arranged in series. The location of the pressure compensator (inlet or outlet) in two-way flow regulators is determined by design considerations.

Consider the features of the use of two-line flow controllers when throttling the RJ flow: at the inlet (primary control), at the outlet (secondary control) and in the branch.

When controlling the flow of RJ at the inlet(see Fig. 1, a) the flow regulator is installed in the pressure hydraulic line of the pump after the safety valve, before the hydraulic motor. This throttling scheme is recommended for hydraulic systems where the speed of the hydraulic motor is controlled to overcome the counter force (positive resistance). In this case, a load is applied in front of the flow regulator, which is determined by the external resistance on the hydraulic motor.

The disadvantage of this scheme is the need to adjust the safety valve installed before the flow regulator to the maximum possible pressure in the hydraulic motor. As a result, the pump constantly operates at maximum pressure, even when the hydraulic motor overcomes a small load. In addition, power losses during flow throttling turn into heating of the RJ, which must be cooled to stabilize the thermal regime.

When controlling the flow of RJ at the outlet(see Fig. 1, b) the flow regulator is installed at the outlet of the hydraulic motor in front of the tank. This flow control scheme is recommended for hydraulic systems with a tail load (negative) that tends to move the hydraulic cylinder rod or rotate the hydraulic motor shaft faster than the flow rate of the RJ determined by the pump flow. The main drawback of the throttling scheme remains - the need to adjust the safety valve to the maximum pressure and the effect of the maximum pressure on the sealing elements of the hydraulic cylinder even at idle, i.e. with more high level friction.

When controlling flow in a branch(see Fig. 1, c) the regulator is installed parallel to the hydraulic motor. In this scheme, the regulator limits the flow of RJ entering the hydraulic motor by bypassing part of the flow injected by the pump into the hydraulic system tank. If the working body reaches the stop, the pressure in the hydraulic system is limited by the setting of the safety valve, and the discharge of the RJ flow through the valve is again converted into heating.

The advantage of this flow control scheme is the limited operating pressure, which is determined by the external load on the working body or on the actuator. In this case, less power is converted into heating of the RJ, and the heat released during throttling is removed to the hydraulic system tank.

From the above comparison of throttling and regulating hydraulic devices for controlling the flow of RJ, a clear advantage of flow controllers follows, which are a combination of a throttle with a regulator that maintains a constant pressure drop across the throttling gap.

Unlike two-line flow regulators, dosing A 2 and control A 1 holes in three-line flow regulators are not in series, but in parallel.

Electronic fluid regulator are used to maintain the refrigerant level in a shell-and-tube evaporator (Fig. 1, a), an air-cooled evaporator (Fig. 1, b) or in an intermediate vessel of a two-stage refrigeration unit. The regulator has a float device (3) which is installed on the liquid bypass pipe connected to the liquid separator (2) of the evaporator (1). The liquid refrigerant enters from the condenser through the pipeline, passes through the solenoid valve (5), the manual expansion valve (6) and is sent to the evaporator (1) through the separator (2). The valve (6) when valve (5) is open controls the flow of liquid refrigerant into the evaporator. As a result of the boiling of the refrigerant, moist vapor is formed, which is directed through the separator (2) through the suction pipe (11) to the compressor.

If the compressor is not running, the solenoid valve (5) closes the liquid line and the solenoid valve (7) acts on the valve (9) which closes the suction line (11). Control valve installed between valves (7) and (9) constant pressure(8). The valve (5) is electrically controlled through a device (3) and a transducer (4) connected by an electric wire (10) to the compressor.

The device of the float device of the liquid regulator shown in figure 2.

Rice. 1 - Scheme of electronic control of liquid in a shell-and-tube evaporator (a) and an air-cooled evaporator (b)

If the solenoid valve is used as a pilot device (fig. 3), it receives impulses from the room thermostat or pressure switch. While the valve is inactive, the actuator remains closed, but when the solenoid is turned on, vapor from the evaporator will begin to pass through the filter (1) and channel (11) into the mechanism cylinder above the servo piston. Under the pressure of the vapors, the piston will descend and open the actuator, which remains open even if the vapors from the cylinder exit continuously through the equalizing channel, since the pressure drop through this channel is greater than through the solenoid valve bore.

When the current is turned off, the solenoid valve closes, the pressure in the mechanism cylinder decreases until it closes.

Rice. 2 - Float device: 1 - waterproof metal case; 2 - relay; 3 - magnetic amplifier; 4 - transformer; 5 - ground terminal; 6 - connecting clamps; 7 - cable entry fitting; 8 - control coil; 9 - float body; 10 - float with control tube; 11 - connecting flanges

Rice. 3 - Pilot solenoid valve: 1 - filter; 2 - refrigerant inlet channel; 3 - unloading hole; 4 - valve body; 5 - spindle; 6 - solenoid housing; 7 - anchor; 8 - coil; 9 - terminal; 10 - valve; 11 - valve seat channel; 12 - refrigerant outlet channel; 13 - manual opening spindle; 14 - cap

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The installation of plumbing equipment in a house, enterprise or municipal institution is usually carried out in accordance with all the rules of maintenance and operation. Most consumers purchase plumbing from reliable manufacturers, but some factors can disable any equipment. For example, water pressure drops in the water supply system often cause equipment breakdowns. To solve this problem, it is worth installing a water pressure regulator.

What is a water pressure regulator, what is the principle of its operation

The regulator, or water pressure reducer (RDV) is a special control device for plumbing that maintains normal water pressure. Sudden changes in pressure can not only ruin expensive equipment, but also damage repairs in an apartment or house, which leads to new expenses. The gear mechanism is able to reduce the fluid supply force to a normal level and prevent water hammer.

There are two types of WFD design, which differ in the direction of regulation:

1. from oneself - works in a pipeline installed on a plumbing outlet;
2. to yourself - works on the highway towards plumbing fixtures.

The principle of operation of both types is to change the cross section of the valve. With a stable pressure that does not exceed the norm, the working valve is kept open. Minor jumps provoke automatic valve shut-off, which reduces pressure and reduces the risk of breakage of drainage pipes.

• brass or steel body (1) with cover (2) and stopper (3);
• adjusting bolt for adjusting the mechanism (4);
• nut for fixing the bolt (5);
• piston rod (6, 13) with cylinder (8);
• mechanical springs (7);
• diaphragm (9) with distribution ring (10) or piston in a mechanical model;
• working valve, consisting of a screw (11) and a gasket (12);
• seal (14) and damper chamber for plug (15).

Also, gearboxes, depending on the manufacturer and purpose, are equipped with additional elements- air valves, filter, manometer, ball valve.

Hot and cold water are static and dynamic. The former maintain a set pressure level on a permanent basis, the latter are designed for continuous water supply and flow. Reducers are used in domestic and industrial municipal water supply, at pumping stations and in fire services, as well as at water stations and melioration stations.

What are the types of regulators in the water supply system

Modern stores offer to buy water pressure reducers of any kind and purpose. There are several classifications of RDD types.

Regulators that are different internal device and working principle:

• piston - mechanical devices that are in demand due to their low price and ease of use;
• membrane - more powerful and expensive devices powered by springs and a diaphragm.

Types of regulators by control method:

• electronic - equipped with an electric sensor that scans the pressure to activate the pump;
• automatic - equipped with a block with springs and nuts susceptible to pressure drops.

Piston reducer it works from springs, a piston and a valve, which, depending on the pressure, control the operation of the spool. The advantages of this design are affordable price, ease of installation and simple reliable mechanism. Of the minuses, it is worth noting high sensitivity to dirt and friction parts.

Diaphragm reducer characterized by increased throughput, excellent performance and long service life without breakdowns. The device operates from a spring-loaded diaphragm, which is located in a special sealed compartment. Such devices have a high price, but it is justified by powerful technical specifications.

There are also flow regulators, which are rarely used, but have good properties. They do not have a movable mechanism - the internal structure consists of numerous ducts and compartments. Water, entering such a labyrinth, slows down the speed of movement, which reduces its pressure and protects plumbing from water hammer.

Technical characteristics of popular RDV models

Regulator type	Connection diameter (inch)	Pressure regulation limits (Bar)	Throughput (m³/h)	Rated water flow (m³/)
With filter and pressure gauge	1/2	2-5	1,40	0,95-1,27
With filter and pressure gauge	1/4	2-5	2,44	1,70-2,27
flow limiter	1/2	2-4	1,98	0,95-1,27
Membrane	1/2	0,5-7	1,85	0,95-1,27
Membrane	3/4	0,5-7	2,60	1,70-2,27
Piston	1/2	1-4,5	1,60	0,95-1,27
Piston	3/4	1-4,5	2,61	1,70-2,27
Piston	1	1-4,5	3,34	2,65-3,53
Piston	1 ¼	1-4,5	4,89	4,34-5,79
Piston	1½	1-4,5	7,85	6,78-9,00
Piston	2	1-4,5	10,8	10,6-14,1
Piston with pressure gauge	1/2	0,5-5,5	1,6	0,95-1,27

Installing the RDV regulator

It is recommended to trust the installation of a water pressure reducer to specialists and experienced craftsmen. This is the only way to get a guarantee of reliable long-term operation of the device without unscheduled repairs. If there is practical experience in the installation of plumbing or measuring equipment on pipes, you can install the RFE with your own hands.

The order of installation of the gearbox in the apartment:

1. Turn off and shut off the water throughout the riser. If necessary, notify neighbors about the temporary shutdown.
2. Place an inlet valve on the pipe between the ball valve and the meter.
3. Attach a large particle filter system behind the counter.
4. Install the control device on a horizontal pipe.
5. Seal all joints of parts using sealant.
6. Adjust the position of the pressure gauge so that the dial is clearly visible.
7. Connect the installed WFD to ball valve, check the smooth operation of the device.

Installation of RFE in a private country house slightly different from the apartment. In order to prevent water hammer and disruption of plumbing equipment in the house, you should install the regulator immediately behind the meter, and then install a check valve, filter and faucet.

To choose a reliable device for adjusting the water pressure, you need to know some parameters that should be considered:

• throughput. For domestic use 0.1-0.15 m³/h is recommended, for commercial - 0.2-0.3 m³/h, for industrial - over 0.3 m³/h.
• Permissible pressure loss. With a small water consumption, 1-2.5 Bar is considered the norm, with an average - 2-5 Bar, with an increased one - 4-7 Bar.
• Flow section diameter. It is measured in inches and depends on the destination. For residential buildings, the diameter should be ½-¼ inches, for industrial buildings - from ¾ to 2 inches.
• Connection method. There is a flange and threaded (coupling) connection of parts that differ in the type of fastening and cost.

If there was a choice - to install a water pressure regulator or not, the answer is unequivocal - to install. The device fully justifies its cost, and consumers note a lot of advantages of the RFE installation:

• reliable and durable resistance of plumbing to hydraulic loads and pressure drops;
• long-term preservation of sanitary equipment in a house, apartment or enterprise;
• financial savings due to reduced water use;
• no noise in the pipeline and during the operation of the gearbox;
• stable outlet pressure regardless of the inlet level.

Overview of the best gearbox manufacturers

On the Russian market a huge range of water control devices from various manufacturing companies is presented. Some of them for long years sales proved their authority and competence in the manufacture of WFD.

1. VALTEC. An Italian company with an official representative office in Russia. Production processes are fully automated, which eliminates the human factor. We have our own laboratory for testing the functionality of products.
2. HONEYWELL. A concern from Germany, which appeared in Russia 45 years ago. He gained worldwide fame thanks to modern developments in the field of engineering communications, energy resources, oil refining and space industry;
3. ICMA. The main office and factory of the company are located in Italy, from where it is supplied to Russian cities products for water supply, heating, ventilation, air conditioning. The management pays Special attention raw materials and materials that customers value.
4. AQUASFERA. A well-known Russian company specializes in the manufacture and sale of control, shut-off and safety valves, and also supplies valves, fittings, filters and pipes to most Russian cities.
5. WATTS. A company from the USA with many branches in Europe, which is focused on the production of devices for the control, purification, supply and consumption of water resources. The brand's products are intended for both residential and industrial sectors.

It is also worth noting such leading world brands as FADO, DANFOSS, GIACOMINI, EDD, ALTAIS. VALTEC engineering and communication products are especially in demand, which are distinguished by stable technical characteristics, long service life and affordable price. You can buy VALTEC water pressure regulators from us, the official representative of the brand.