Control valves for radiator thermostats RA are classified into two types: RA-N(for two-pipe pump heating systems) and RA-G(for one-pipe pumping and two-pipe gravitational systems) 1). The RA-N valve is a valve of increased hydraulic resistance with preliminary installation setting of its maximum flow capacity. Valves are produced with nominal diameter from 10 to 25 mm, straight and angle, nickel-plated. Danfoss' range includes a modification of the DN = 15 mm RA-NCX valve with a chrome body, which is usually used in conjunction with RAX thermocouples in chrome or color. RA-NCX valves are rarely used and valves RA-N DN = 10 and 25 mm do not find practical application in Russia at all, therefore they are not presented in this manual. Angle horizontal and three-axis valves are used when it is necessary to use a thermostatic element with a built-in sensor and the pipelines supplying the heat carrier to the heater are laid from below. The Danfoss range also includes a RA-N DN = 15 mm valve with a pressure connection for a copper pipe ø15x1 mm, which is used in horizontal apartment heating systems. Technical information for RA-N valves DN = 10 and 25 mm , RA-NCX and RA-N DN = 15 mm for press connections are presented in catalog VD.53.P17.50 "Radiator thermo-regulators and pipe fittings for hot water heating systems". RA-N valves are supplied with a red protective cap.

The main advantage of Danfoss RA-N valves is convenience and accuracy of adjustment to the required hydraulic resistance (flow capacity). In valves from other manufacturers, the setting is the number of revolutions of the special tool from the closed position. In this case, it is impossible to determine the value of the setting visually without disturbing the existing position of the device. It will not be accurate either, since it is not clear how many revolutions, for example 3 or 3 ¼. The presence of a special tool complicates the adjustment work. Externally, the same valves from different companies have different fixed settings. During installation, builders often confuse them and in the future cannot establish the heating system. Some companies offer to make the setting not on the thermostat-regulator, but on the shut-off valve, changing the number of revolutions of its stem. This is inconvenient, as it leads to a rise in the cost of work and a decrease in the accuracy of adjustment.

The presetting device is a throttling cylinder associated with a rotary crown. The different positions of the crown and cylinder correspond to the specific flow rates of the thermostat valve. On the crown, numeric indices of the positions of the tuning element are indicated. The setting indices must be determined during the hydraulic calculation of the heating system and set against drilling on the valve body during installation and commissioning work. Tuning is done without the use of any tool. The adjusting device is hidden under the thermostatic element and, when it is blocked, becomes inaccessible for accidental readjustment. In case of possible clogging of the valve at low presetting values, it is enough to turn the adjusting crown to the "N" position (fully open), and the valve is flushed with water. After that, the setting returns to its original position. The presetting values ​​are clearly visible on the crown (it is easy to set up or check the correctness of the setting). Each valve has 14 fixed setpoints (settings 1 to 7, N and six intermediate positions).

RA-G - a valve of low hydraulic resistance without a device to limit its capacity. The valves are manufactured with a nominal diameter of 15 to 25 mm with a nickel-plated body. They can also be straight and angled. The manual does not include the RA-G valves DN = 25 mm, since they are not practically used in Russia. Technical information on them is presented in catalog VD.53.P17.50 "Radiator thermostats and pipe and wire fittings for hot water heating systems". The RA-G valves are supplied with a gray protective cap. The RA-N and RA-G dampers are connected to the heating devices using threaded shanks with a union nut, and with the pipeline through a coupling socket. If necessary, in heating systems, a special version of RA-N valves can be used - with an external connecting thread or with a fitting for a press connection with a copper pipe ø15x1 mm. Many Russian factories produce heating devices with built-in Danfoss thermostat valves. Among them are the Moscow plant Santekhprom, which produces a bimetallic radiator Santekhprom-BMN Auto and convectors with a casing of the Santekhprom Auto series; JSC "Mechanical Plant" (St. Petersburg) - steel panel radiator of the "Konrad-Thermo" type; plant "Radiator" (Kimry) - steel tubular radiator of the "RS" type, etc. Convectors and steel radiators are equipped with thermostat valves for both two-pipe and one-pipe heating systems. Other devices with built-in thermostats are intended for two-pipe systems only. Danfoss thermostat valves built into a heater are generally similar in design and hydraulic performance to the RA-N and RA-G stand-alone thermostat valves. Technical characteristics of Russian heating devices with thermostats are given in the passports of manufacturers heating equipment, in the relevant materials of Danfoss LLC, and also included in the database of the Danfoss S.O. program for calculating heating systems on personal computers.

The main advantage of Danfoss RA-G valves- high throughput (RA-G DN = 20 mm has Kv = 2.06 m3 / h at Xp = 2 ° C). This is important in one-pipe heating systems to achieve optimal values ​​of the coefficient of flow of the coolant from the riser to the heater. High flow capacity is obtained due to the large valve seat area and increased stroke (more than 30% when using a thermostatic element with gas condensate filling compared to liquid-filled thermostats). These valves are the only ones with such a capacity that have the European quality certificate EN215. This is due to their ability to tightly shut off the coolant flow through the heater when the room temperature rises by 2 ° C more than the calculated one. In addition, the valve presents a unique service capability: its seat and plug can be completely replaced on site if required (without dismantling the valve).

RA-N valve for two-pipe pump heating system; PN = 10 bar, Tmax. = 120 ° C, with internal thread

Valves for two-pipe heating system RA

RA-N valve intended for use in two-pipe pumping systems for hot water heating with copper or stainless steel pipelines. Special crimping tools are required to connect the valve fitting to the pipeline.

RA-N valve for two-pipe pump heating system; PN = 10 bar, Tmax. = 120 ° С, for press connection with the pipeline. It is possible to use tools from Geberit Mapress, REMS, Rothenberger, SANHA, Viega

RA-G valve for one-pipe pumping and two-pipe gravitational heating systems; PN = 10 bar, Tmax. = 120 ° C, with internal thread

Control valve RA-G has an increased throughput and is intended for use in pumping one-pipe water heating systems with closing sections (bypasses).

Thermostat RA consists of two parts:

• universal thermostatic element of the RA 2000 series - automatic temperature control devices;
• control valve with pre-setting of the flow rate RA-N (for two-pipe heating systems) or RA-G (for one-pipe system).

The production program for thermostatic elements of the RA 2000 series includes:

• RA 2994 and RA 2940 with built-in temperature sensor, frost protection of the heating system, temperature setting range 5–26 ° C, device for fixing and limiting the temperature setting. Unlike RA 2990, the RA 2940 thermocouple additionally has a function that ensures 100% overlap of the thermostat valve;
• RA 2992 - thermoelements with a remote sensor, frost protection of the heating system, a temperature setting range of 5–26 ° C, a device for fixing and limiting the temperature setting;
• RA 2920 - thermoelements with a casing that protects against unauthorized interference, a built-in sensor, frost protection, a temperature setting range of 5–26 ° C, a device for fixing and limiting the temperature setting;
• RA 2922 - thermoelements with a cover that protects against unauthorized interference, a remote sensor, frost protection, a temperature setting range of 5–26 ° C, a device for fixing and limiting the temperature setting.

RA 2992 and RA 2922 are equipped with an ultra-thin capillary tube 2 m long, which is located inside the housing of the remote sensor, connecting it to the working bellows of the thermostatic element. During the installation process, the tube is pulled to the required length.

RА 5060/5070 series - a range of remote control thermoelements with frost protection of the heating system, a temperature setting range of 8-28 ° C, a device for fixing and limiting the temperature setting:

• RA 5062 - with a capillary tube length of 2 m;
• RA 5065 - with a capillary tube length of 5 m;
• RA 5068 - with a capillary tube length of 8 m;
• RA 5074 - with capillary tube length 2 + 2 m.

All thermostatic elements can be combined with any RA type control valves.

The clip-on connection allows simple and precise fastening of the thermocouple to the valve.

The protective cover of the RA 2920 and RA 2922 thermocouples prevents unauthorized disassembly and adjustment by unauthorized persons.

Technical characteristics of RA type radiator thermostats comply with European standards EN 215-1 and Russian GOST 30815-2002.

1) The remote sensor is supplied with a capillary tube fully wound inside the sensor box. When installing the sensor, unwind only the required part of the tube.

2) The temperature scale is calibrated for Xp = 2 ° C. This means that the valve closes completely when the room temperature exceeds the setting temperature by 2 ° C.

3) A brass handle must be used to seal off the valve in a pressurized system and to dismantle the heater.

LLC "Promarmatura XXI century" offers the widest range of products from Danfoss

The range of products includes: | | | | | | |
Danfoss is the world's largest manufacturer of radiator thermostats. Over the years, Danfoss has sold more than 300 million radiator thermostats worldwide, saving one million liters of fuel every day and preventing tons of environmental damage. carbon dioxide, sulfur compounds and other harmful substances. Radiator thermostats pay for themselves in less than two years, and a standard life of more than 20 years is a great opportunity to save money and energy.

Danfoss radiator thermostats are manufactured with built-in and remote sensors for optimal performance; plus a wide range of valves and accessories make up the widest range of our products.

Thermostatic elements of the RA 2000 series

Thermostatic elements of the RA 2000 series are automatic temperature control devices intended for completing RA type radiator thermostats. The radiator thermostat is a direct-acting proportional air temperature controller with a small proportional band, which is currently used in heating systems of buildings for various purposes. Thermostat RA consists of two parts:

The long-term absence function allows you to reduce the temperature in a room when it is not in use. The absence period and temperature are freely adjustable by the consumer.

The choice of programs and their setting are made in accordance with the instructions attached to the thermoelement.

Thermoelectric actuators TWA series

Thermoelectric mini-actuators of the TWA series are designed for two-position control of various control valves in heating and heating and cooling systems of local ventilation units.

The actuator is equipped with a visual travel indicator that indicates whether the valve is closed or open.

Depending on the version, TWA actuators can be used with Danfoss RA, RAV8 and VMT valves, as well as Heimeier, MNG and Oventrop valves with M 30 x 1.5 actuator mounting threads. If the actuator is used with other types of valves, the valve must be checked to ensure that the geometry is compatible and that it closes. The supply voltage of the actuator is 24 or 230 V. The valves can be normally closed in the absence of voltage (NC) and normally open (NO). In addition, the normally closed actuator with a 24 V supply voltage is supplied with a limit switch (NC / S).

Presetting thermostat valves RA-N and RA-NCX DN = 15 mm (chrome-plated)

Control valves RA-N and RA-NCX are intended for use in two-pipe pumping systems for hot water heating.

RA-N is equipped with a built-in device for preliminary (editing) adjustment of its bandwidth within the following ranges:

The main task of any heating system is to provide a comfortable air temperature in the room. This temperature can be different depending on the purpose of the room, but if its unchanged during the day is a prerequisite, then the thermostat becomes indispensable. structural element heater.
The Danfoss radiator thermostat consists of two parts: a valve and a thermostatic element (thermal head). Inside the thermostatic element there is a thin sealed cylinder - a bellows filled with a liquid or gaseous thermosensitive working substance. As the temperature rises, the bellows stretches and moves the associated rod, which presses on the rod in the valve, and the valve reduces the flow of coolant into the radiator. When the temperature drops, the process is reversed. Thus, the thermal head is a control mechanism, and the valve is an executive one.

Manufacturer: Danfoss (Denmark).

Danfoss radiator thermostat valves

Radiator thermostat valves are divided into:
- valves for a two-pipe pump heating system ( type RA-N) increased resistance with a device for adjusting their throughput to perform hydraulic balancing of the pipeline system;
- valves of increased throughput type RA-G for pumping one-pipe or two-pipe gravitational heating system.

Danfoss valve bodies are made of brass. The connection allows easy and precise attachment of the thermostatic element to the control valve. To identify the RA-N valves, their protective caps are colored red and the RA-G valves are gray.

Danfoss RA-G thermostat valves

Danfoss RA-N thermostat valves

The RA-G and RA-N series valves can be combined with the RA series.

The Danfoss thermostatic equipment set consists of a RA-G radiator valve (for a one-pipe or two-pipe heating system) or RA-N (for a two-pipe heating system) and a RA thermostatic element.
The set is designed for automatic regulation of the room temperature.
Easily installed on various types of heating devices in apartments with centralized one-pipe and two-pipe heating systems.

Danfoss thermostatic elements

Danfoss thermostatic elements (thermal heads) are automatic temperature control devices designed for completing radiator thermostats.
The thermostat, equipped with a thermostatic element, maintains a constant temperature in the room at the desired level within the range from + 5 ° C to + 26 ° C with an accuracy of ± 1 ° C.
It should be remembered that thermostats are for the most part regulatory fittings, but not shut-off(except for the RA2940 and RAW 5110 thermostats), therefore, if it is necessary to dismantle the radiator, the thermal head should be replaced with a bronze shut-off handle, which will completely shut off the coolant flow.

Danfoss thermostatic elements

	RA 2994	Thermostatic element with gas-filled temperature sensor. Temperature adjustment range: from + 5 ° С to + 26 ° С.	RUB 1,440
	RA 2992	Thermostatic element with gas-filled remote temperature sensor. Temperature adjustment range: from + 5 ° С to + 26 ° С. Capillary tube length: 2 m.	RUB 2 200
	RA 2920	Thermostatic element with gas-filled temperature sensor and tamper-proof. Temperature adjustment range: from + 5 ° С to + 26 ° С.	RUB 2 190
	RA 2940	Thermostatic element with gas-filled temperature sensor. Temperature adjustment range: from + 0 ° С to + 26 ° С. The ability to shut off the coolant supply.	RUB 1,600
	RAW 5010	Thermostatic element with liquid temperature sensor. Temperature adjustment range: from + 8 ° С to + 28 ° С.	RUB 1,390
	RAW-K	Thermostatic element with liquid temperature sensor. Temperature adjustment range: from + 8 ° С to + 28 ° С. For installation on built-in valves (M30x1.5) of radiators with a lower connection - Rifar, Copa, Kermi, Demrad, Stelrad, Purmo, Korado.	RUB 1,390
		Thermostatic remote control element with liquid temperature sensor. Temperature adjustment range: from + 8 ° С to + 28 ° С. Capillary tube length: 2 m (RA 5062), 5 m (RA 5065).	RUB 4,590 RUB 4,960

When installing thermostats, it should be remembered that the effect of their use will be noticeable if they control radiators with low thermal inertia. Practically, these are all known types of modern radiators except cast iron. The latter, due to the large mass of cast iron and water, will heat up and cool down very slowly, negating the effect of regulation.

Shut-off and connecting valves RLV are designed for lateral connection to the radiator of pipelines of a two-pipe heating system. Available in straight and angled versions.
P y = 10 bar *; T max = 120 ° C; ΔP max = 0.6 bar.

* Conditional pressure. See GOST 356-80 Pipeline fittings and details. Nominal, test and working pressures.