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 a prerequisite is its invariability during the day, then the thermostat becomes irreplaceable. structural element heater.
Radiator Danfoss 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) of increased resistance with a device for mounting adjustment of 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

RA-G 15	Thermostat valve RA-G 15 for one-pipe or two-pipe system, according to the type of connection - straight or angle, connection size - 1/2 "(DN 15).	RUB 1,930
RA-G 20	Thermostat valve RA-G 20 for a one-pipe or two-pipe system, by the type of connection - straight or angle, connection size - 3/4 inch (DN 20).	RUB 2,460
RA-G 25	Thermostat valve RA-G 25 for a one-pipe or two-pipe system, by the type of connection - straight or angle, connection size - 1 inch (DN 25).	RUB 3,100

Danfoss RA-N thermostat valves

RA-N 15	Thermostat valve RA-N 15 for a two-pipe system, by connection type - straight or angle, connection size - 1/2 "(DN 15).	RUB 1,600
RA-N 20	Thermostat valve RA-N 20 for a two-pipe system, by connection type - straight or angle, connection size - 3/4 inch (DN 20).	RUB 2,000
RA-N 25	Thermostat valve RA-N 25 for a two-pipe system, by the type of connection - straight or angle, connection size - 1 inch (DN 25).	RUB 3,600

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

Thermostatic element and radiator valve

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.

RA 2994 / RA-G 15 straight Code 013G2164B Direct thermostat valve RA-G 15 for one-pipe or two-pipe systems, thermostat RA 2994.	RUB 2,990
RA 2994 / RA-G 15 corner Code 013G2163B Angle thermostat valve RA-G 15 for one-pipe or two-pipe systems, thermostat RA 2994.	RUB 2,990
RA 2940 / RA-G 15 straight Article 013G2144 Direct thermostat valve RA-G 15 for one-pipe or two-pipe systems, thermostat RA 2940.	RUB 3,200
RA 2940 / RA-G 15 corner Article 013G2143 Angle thermostat valve RA-G 15 for one-pipe or two-pipe systems, thermostat RA 2940.	RUB 3,200
RA 2994 / RA-G 20 straight Code 013G2166B Direct thermostat valve RA-G 20 for one-pipe or two-pipe systems, thermostat RA 2994.	RUB 3,390
RA 2994 / RA-G 20 corner Code 013G2165B Angle thermostat valve RA-G 20 for one-pipe or two-pipe systems, thermostat RA 2994.	RUB 3,390
RA 2940 / RA-G 20 straight Article 013G2146 Direct thermostat valve RA-G 20 for one-pipe or two-pipe systems, thermostat RA 2940.	RUB 3,690
RA 2940 / RA-G 20 corner Article 013G2145 Angle thermostat valve RA-G 20 for one-pipe or two-pipe systems, thermostat RA 2940.	RUB 3,690
RA 2940 / RA-N 15 straight Article 013G2154 Direct thermostat valve RA-N 15 for two-pipe system, thermostat RA 2940.	RUB 2,900
RA 2940 / RA-N 15 corner Article 013G2153 Angle thermostat valve RA-N 15 for two-pipe system, thermostat RA 2940.	RUB 2,900
RA 2940 / RA-N 20 straight Article 013G2156 Direct thermostat valve RA-N 20 for two-pipe system, thermostat RA 2940.	RUB 3,290
RA 2940 / RA-N 20 corner Article 013G2155 Angle thermostat valve RA-N 20 for two-pipe system, thermostat RA 2940.	RUB 3,290

Danfoss thermostatic elements

Thermostatic elements(thermal heads) Danfoss 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 Fittings and pipeline parts. Nominal, test and working pressures.

The remote control thermostat is used when the heating devices and the thermostat valves installed on them are inaccessible to the user, for example, covered with non-removable decorative panels. In this case, the sensor and the adjusting unit are combined. Remote control thermostats should be located at a height of 1.2-1.6 meters from the floor or in another accessible place so that room air can freely circulate around the sensor.

Device and principle of operation

The main device of the thermostatic element is a bellows, which provides proportional control. The thermocouple sensor senses changes in the ambient temperature. The bellows and the sensor are filled with a highly volatile liquid and its vapors. The calibrated pressure in the bellows corresponds to its charging temperature. This pressure is balanced by the compression force of the tuning spring. As the air temperature around the sensor rises, some of the liquid evaporates, and the vapor pressure in the bellows increases. In this case, the bellows increases in volume, moving the valve spool towards closing the hole for the coolant flow into the heater until an equilibrium is achieved between the spring force and the vapor pressure. When the air temperature drops, the vapors condense, and the pressure in the bellows drops, which leads to a decrease in its volume and movement of the valve spool towards the opening until the position at which the system equilibrium is established again.

The vapor fill will always condense in the coldest part of the transmitter, usually the furthest from the valve body.

Therefore, the radiator thermostat will always react to changes room temperature without feeling the temperature of the coolant in the supply pipeline. Nevertheless, when the air around the valve is nevertheless heated by the heat given off by the pipeline, the sensor can register more high fever than indoors. Therefore, to exclude such influence, it is recommended to install thermostatic elements, as a rule, in a horizontal position. Otherwise, it is necessary to use thermoelements with remote sensor.

Thermoregulatory valve with increased flow capacity, type RA-G

Thermostatic valve with increased flow capacity, type RA-G, is intended for use in pumped one-pipe water heating systems. They can also be used in two-tube gravity systems.
Thermostatic valves type RA-G have fixed flow rates.
All thermostatic valves type RA-G can be used with any thermo-static elements of the RA, RAW, RAX series or thermoelectric actuators TWA-A. For identification purposes, type RA-G valves are supplied with gray protective caps.
The cap should not be used to shut off the controlled medium. For these purposes, you should use a special metal
handle (code number 013G3300).
The push rod in the packing is made of chrome plated steel and does not require lubrication for the entire life of the valve.
All thermostatic valves type RA-G can be used with the entire range of compression fittings for copper pipes (information
about fittings on request). To prevent deposits and corrosion, RA-G valves should be used in hot water heating systems, where the coolant meets the requirements of the Rules for the Technical Operation of Power Plants and Heating Networks Russian Federation.

Nomenclature and technical characteristics

Type of	Execution	Connecting thread		Throughput Kv 1), m 3 / h at a relative range X p, ° C					Maximum pressure, bar		Limiting differential pressure 2), bar	Max. coolant temperature, ° C	Code number
				With thermocouple				Without t / e	Working	Test
		entrance	Output	0,5	1,0	1,5	2,0	-
RA-G 15	Angular	int. R p ½	outdoor R p ½	0,54	1,07	1,61	2,06	4,30	16	25	0,2	120	013G1676
	Straight	int. R p ½	outdoor R p ½	0,51	0,94	1,35	1,63	2,30					013G1675
RA-G 20	Angular	int. R p ¾	outdoor R p ¾	0,57	1,11	1,16	2,20	5,01					013G1678
	Straight	int. R p ¾	outdoor R p ¾	0,54	1,07	1,61	2,06	3,81			0,16		013G1677
RA-G 25	Angular	int. R p 1	outdoor R p 1	0,59	1,27	1,77	2,41	5,50					013G1680
	Straight	int. R p 1	outdoor R p 1	0,57	1,16	1,71	2,27	4,58					013G1679

Valve device

1. Gland packing
2. O-ring
3. Valve disc
4. Valve seat
5. Pressure pin
6. Return spring
7. Valve stem
8. Valve body
9. Union nut
10. Connection nipple

Device

Thermostatic elements of the RA 2000 series

Thermostatic elements of the RA 2000 series are automatic temperature control devices intended for completing the 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:
universal thermostatic element of the RA 2000 series;
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 the function of
providing 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 protecting against unauthorized interference, a remote sensor, protection
from freezing, with 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 installation, the tube is pulled to the required length. Series RA 5060/5070 - a number of remote control thermoelements with frost protection of the heating system, a temperature setting range of 8-28 ° C, a device
to fix and limit 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. Clip-on connection ensures simple
and precise fastening of the thermocouple to the valve. The protective casing of the RA 2920 and RA 2922 thermocouples prevents their unauthorized dismantling and readjustment by unauthorized persons. Specifications radiator thermostats type RA comply with European standards EN 215-1 and Russian GOST 30815-2002.

Nomenclature and code numbers for ordering
Thermostatic elements of the RA 2000 series

Type of	Model Description	Temperature setting range 2), ° С	Capillary tube length, m	Code number
RA 2994	With built-in sensor and frost protection for the heating system	5–26	-	013G2994
RA 2992		5–26	0–2	013G2992
RA 2940	With built-in sensor and 100% thermostat valve overlap function 3)	0–26	-	013G2940
RA 2920	With built-in sensor and protective cover	5–26	-	013G2920
RA 2922	The same, with a remote sensor 1)	5–26	0–2	013G2922
RA 5062	Remote control element	8–28	2	013G5062
RA 5065	Also	8–28	5	013G5065
RA 5068	Also	8–28	8	013G5068
RA 5074	The same, with a remote sensor 1)	8–28	2 + 2	013G5074

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) For the tight shutoff of the valve when the system is operating under pressure and for dismantling the heater, use a brass
handle (part number 013G3300).

Optional accessories

Product, description	Code number
Handle for RA thermostat valve, brass	013G3300
Pins for limiting the temperature setting RA 2990/92/40 (10 pcs.)	013G1246
Temperature limiting pins RA 2920/22 (30 pcs.)	013G1237
Clip to prevent unauthorized dismantling of the thermocouple RA 2990/92 (20 pcs.)	013G5245
Screws to prevent unauthorized dismantling of the RA 2920/22 thermocouple (50 pcs.)	013G1232
Cover for thermocouple adjustment scale RA 2920 and 2922	013G1672
Mounting and locking tool kit	013G1236
Adapter for mounting thermocouples RA 5062, 5065 and 5068 on RA valves	013G5191
Adapter for mounting thermocouples RA 5062, 5065 and 5068 on valves with M30 x 1.5 seat thread	013G5194

Device and principle of operation

Thermostatic element design with built-in and remote sensor
1 - tuning handle;
2 - working bellows;
3 - setting scale;
4 - tuning spring;
5 - stock;
6 - remote sensor;
7 - capillary tube

Thermostatic remote control device with built-in sensor
1 - tuning handle;
2 - working bellows;
3 - setting scale;
4 - valve drive;
5 - drive bellows;

7 - capillary tube

The device of a thermostatic remote control element with a remote sensor

1 - tuning handle;
2 - working bellows;
3 - setting scale;
4 - valve drive;
5 - drive bellows;
6 - adapter for mounting the actuator on the valve;
7 - capillary tube;
8 - remote sensor

dimensions

• Shut-off and shut-off and connecting fittings;
• Quick shutdown of devices and drainage of the coolant (RLV series);
• Nickel-plated and chrome-plated brass models;
• Angular and straight execution;
• Equipment for a two-pipe heating system.

The updated range of valves mod thermostatic heads. Valve type RA. Two types of valves: for one-pipe and two-pipe systems.

Thermostat control valves are divided into:

valves for 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 capacity type RA-G for pumping one-pipe or two-pipe gravitational heating system.

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. The valves are produced with a nominal diameter of 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 used in rare cases, and RA-N valves DN = 10 and 25 mm do not find any practical application in Russia, 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 heating device are laid from below. The Danfoss product 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.

Main advantage Danfoss valves type RA-N - 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 setup 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. Numeric indices of the adjusting element positions are indicated on the crown. 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, is 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 position "N" (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 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 valves Danfoss type RA-G- 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 hermetically shut off the coolant flow through the heater when the room temperature is 2 ° C higher 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 ° С, 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.

Type of	Code room	Du, mm	Description	kvs, m 3 / h; kv, m 3 / h	Price (EUR)	Sketch
			Corner, nickel-plated	0,90; 0,04–0,73
			Straight, nickel plated	0,90; 0,04–0,73
				0,90; 0,04–0,73	22,80
				0,90; 0,04–0,73	22,80
				0,90; 0,04–0,73	23,69
			Corner, nickel-plated	0,90; 0,04–0,73	21,18
			Straight, nickel plated	0,90; 0,04–0,73	21,18
			Angle, 3-axis version, right-hand version, nickel plated	0,90; 0,04–0,73	33,25
			Angled, 3-axis version, left-hand version, nickel plated	0,90; 0,04–0,73	33,25
			Corner UK version, nickel plated	0,90; 0,04–0,73	26,35
			Corner, nickel-plated	1,40; 0,10–1,04
			Straight, nickel plated	1,40; 0,10–1,04	26,56
			Corner UK version, nickel plated	1,00; 0,16–0,80	32,94
			Corner, nickel-plated	1,40; 0,10–1,04	47,79
			Straight, nickel plated	1,40; 0,10–1,04	47,79
			Corner, chrome	0,90; 0,04–0,73	24,11
			Straight, chrome plated	0,90; 0,04–0,73	24,11
			Corner, 3-axis version, right-hand version, chrome-plated	0,90; 0,04–0,73
			Angled, 3-axis version, left-hand version, chrome-plated	0,90; 0,04–0,73

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

Type of	Code room	Du, mm	Description	kvs, m 3 / h; kv, m 3 / h	Price (EUR)	Sketch
			Corner, nickel-plated, for press connection	0,90; 0,04–0,43
			Straight, nickel-plated, for press connection	0,90; 0,04–0,43
			Right Angle UK Version Nickel Plated Press Connection	0,90; 0,04–0,73	27,11

RA-G valve for one-pipe pumping and two-pipe gravitational heating systems; PN = 10 bar, Tmax. = 120 ° С, 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).

Type of

Code room

Du, mm

Among the many offers from foreign, domestic manufacturers, a special place is occupied by the products of the Danfoss concern - the world leader in the production of thermal automation. The company has been manufacturing thermostatic elements (valves), or, more simply, thermostats since 1943, constantly offering consumers products that meet European quality standards, characterized by high ergonomics, ease of installation and adjustment.

This series belongs to the category of liquid-filled thermocouples with bellows. These controls are used to equip type RA radiator thermostats with direct action with a small proportional band. They are used in conjunction with the RA-N and RA-G temperature controlled valves, which have a capacity presetting function.

It should be noted that thermoelements of the RAW series are very popular due to the versatility of equipping both one-pipe heating systems ("Leningradok") and two-pipe heating systems.

The model range of this series is represented by the following types of thermostatic elements:

RAW 5010 (with built-in temperature sensor)
RAW 5012 (with remote temperature sensor)
RAW 5110 (with built-in sensor, thermostat valve shut-off device).

The designs of the RAW series thermal heads have additional functional devices that provide ease of installation, protection against unauthorized access, negative consequences from temperature changes. All this provides favorable conditions for their safe operation, creating a comfortable temperature in the premises.

This line of automatic thermal heads with liquid filling, small proportional band is intended for use on valves of such companies as: "Heimeier", "Oventrop", "MNG".

They are optimal solution when installing various designs of steel panel radiators, and, in particular, of the following types: Biasi, Diatherm, DiaNorm, Henrad, Ferroli, Kaimann, Korado, Kermi, Purmo, Radson, Stelrad, Superia, Veha, Zehnder-Completto Fix.

Today the Danfoss company offers the following modifications of devices of this series:

RAW-K 5030 (with built-in temperature sensor)
RAW-K 5032 (with remote sensor)
RAW-K 5130 (with built-in temperature sensor, complete valve closing device).

In addition to standard structural elements, thermoelements are additionally equipped with accessories to protect against unauthorized dismantling, freezing, as well as special tools for installation, blocking, temperature setting limiters.

This series differs from the rest of the Danfoss brand products by being equipped with modern electronic devices for programming 3 heating modes on weekdays, weekends and holidays and time of day.

The RA Plus thermocouples are intended to be installed on all Danfoss RA valves, while the RA-K Plus models can be used on valves from other manufacturers (Heimeier, Oventrop, MNG).