RTL

Return temperature limiter with and without presetting

Among other things, the return temperature limiter RTL is used to limit the return temperatures of radiators or combined floor/radiator systems to equalize the temperature of smaller floor surfaces (up to ca. 15 m2).

Features & Benefits

Models with presetting and automatic flow limitation (AFC)

Body made of corrosion-resistant gunmetal

Stainless spindle with double O-ring seal

Outer O-ring can be replaced while under pressure

Concealed limiting or blocking using stop clips

Technical Information

Technical description

Applications area:

Heating systems

Functions:

Maximum limitation of the return temperature.
Automatic flow limitation with Eclipse valves.
Stepless precision presetting with V-exact II valves.
Shut-off.
Temperature range is limited on both ends and can be blocked using covered stop clips.

Control behavior:

Proportional controller without auxilliary energy.

Dimensions:

DN 15

Pressure class:

PN 10

Temperature:

Max. working temperature: 120°C
Min. working temperature: 2°C

Maximum sensor temperature:

60°C

Specific extension:

0.10 mm/K,
Valve stroke limiter

Flow range Eclipse:

The flow can be stepless pre-set within the range: 10-150 l/h.
Delivery setting: Commissioning
(Max. nominal flow qmN at 10 kPa respecting EN 215: 115 l/h)

Differential pressure (ΔpV) Eclipse:

Max. differential pressure:
60 kPa (<30 dB(A))
Min. differential pressure:
10 – 100 l/h = 10 kPa
100 – 150 l/h = 15 kPa

Material:

RTL thermostatic head:
ABS, PA6.6GF30, brass, steel,
Thermostat filled with an expansible medium.

Valve body: corrosion resistant Gunmetal
O-rings: EPDM rubber
Valve disc: EPDM rubber
Return spring: Stainless steel
Valve insert: Brass, PPS and SPS (syndiotactic polystyrene)
Spindle: Niro-steel spindle with double O-ring sealing. The outer O-ring can be replaced under pressure.

Surface treatment:

Valve body and fittings are nickel-plated.

Marking:

THE, flow direction arrow, DN, II+ Designation.

Colour:

White RAL 9016

Pipe connection:

The female-threaded version is designed for connection to threaded pipe, or in conjunction with compression fittings, to copper precision steel or multi-layer pipe (only DN 15).
The male-threaded version, in conjunction with the appropriate compression fittings, permits connection to plastic pipe.

Articles

Articles – RTL with Eclipse automatic flow limitation

Axial

DN	D	d2	l3	l4	H1	Flow range [l/h]	EAN	Article No
15 (1/2")	Rp1/2	R1/2	29	58	21,5	10-150	4024052931712	9113-02.000

Axial

DN	D	d2	l3	l4	H1	Flow range [l/h]	EAN	Article No
15 (1/2")	Rp1/2	R1/2	29	58	21,5	10-150	4024052931712	9113-02.000

Straight

DN	D	d2	l1	l2	H2	Flow range [l/h]	EAN	Article No
15 (1/2")	Rp1/2	R1/2	66	95	21,5	10-150	4024052931910	9114-02.000

Straight

DN	D	d2	l1	l2	H2	Flow range [l/h]	EAN	Article No
15 (1/2")	Rp1/2	R1/2	66	95	21,5	10-150	4024052931910	9114-02.000

white RAL 9016. With heat transfer piece expecially for thermostatic radiator valves.

RTL Thermostatic head for reverse-flow temperature

white RAL 9016. With heat transfer piece expecially for thermostatic radiator valves.

Setting range	EAN	Article No
0 °C - 50 °C	4024052595112	6510-00.500

RTL Thermostatic head for reverse-flow temperature

white RAL 9016. With heat transfer piece expecially for thermostatic radiator valves.

RTL Thermostatic head for reverse-flow temperature

white RAL 9016. With heat transfer piece expecially for thermostatic radiator valves.

Setting range	EAN	Article No
0 °C - 50 °C	4024052595112	6510-00.500

Articles – RTL with V-exact II stepless precision presetting

Axial

DN	D	d2	l3	l4	H1	Kv p-band max. 2 K	Kvs	EAN	Article No
15 (1/2")	Rp1/2	R1/2	29	58	21,5	0,025 – 0,670	0,86	4024052899111	9103-02.000

Axial

DN	D	d2	l3	l4	H1	Kv p-band max. 2 K	Kvs	EAN	Article No
15 (1/2")	Rp1/2	R1/2	29	58	21,5	0,025 – 0,670	0,86	4024052899111	9103-02.000

white RAL 9016. With heat transfer piece expecially for thermostatic radiator valves.

RTL Thermostatic head for reverse-flow temperature

white RAL 9016. With heat transfer piece expecially for thermostatic radiator valves.

Setting range	EAN	Article No
0 °C - 50 °C	4024052595112	6510-00.500

RTL Thermostatic head for reverse-flow temperature

white RAL 9016. With heat transfer piece expecially for thermostatic radiator valves.

RTL Thermostatic head for reverse-flow temperature

white RAL 9016. With heat transfer piece expecially for thermostatic radiator valves.

Setting range	EAN	Article No
0 °C - 50 °C	4024052595112	6510-00.500

Straight

DN	D	d2	l1	l2	H2	Kv p-band max. 2 K	Kvs	EAN	Article No
15 (1/2")	Rp1/2	R1/2	66	95	21,5	0,025 – 0,670	0,86	4024052899319	9104-02.000

Straight

DN	D	d2	l1	l2	H2	Kv p-band max. 2 K	Kvs	EAN	Article No
15 (1/2")	Rp1/2	R1/2	66	95	21,5	0,025 – 0,670	0,86	4024052899319	9104-02.000

Articles – RTL without presetting incl. RTL thermostatic head

Axial

Connection	Kvs	EAN	Article No
R1/2	2,00	4024052285716	9173-02.800

Connection	Kvs	EAN	Article No
R1/2	2,00	4024052285716	9173-02.800

Axial

Connection	Kvs	EAN	Article No
G3/4	2,00	4024052285013	9153-02.800

Connection	Kvs	EAN	Article No
G3/4	2,00	4024052285013	9153-02.800

Straight

Connection	Kvs	EAN	Article No
R1/2	2,00	4024052285914	9174-02.800

Connection	Kvs	EAN	Article No
R1/2	2,00	4024052285914	9174-02.800

Straight

Connection	Kvs	EAN	Article No
G3/4	2,00	4024052285112	9154-02.800

*) SW1: 27 mm; SW2: 30 mm

Values H1 and H2 are at the bearing surface thermostatic head or actuator.

Kvs = m³/h at a pressure drop of 1 bar and fully open valve.

Attention: The RTL return temperature limiter without presetting is constructed from a special valve body and sensor element. Thermostatic valve bodies cannot be used.

Straight

Connection	Kvs	EAN	Article No
G3/4	2,00	4024052285112	9154-02.800

*) SW1: 27 mm; SW2: 30 mm

Values H1 and H2 are at the bearing surface thermostatic head or actuator.

Kvs = m³/h at a pressure drop of 1 bar and fully open valve.

Attention: The RTL return temperature limiter without presetting is constructed from a special valve body and sensor element. Thermostatic valve bodies cannot be used.

Accessories

for Alu/PEX multi-layer pipe according to DIN 16836. Female thread connection Rp1/2.Nickel-plated brass.

Compression fitting

for Alu/PEX multi-layer pipe according to DIN 16836.
Female thread connection Rp1/2.
Nickel-plated brass.

Ø Pipe		Article No
16x2	4024052138616	1335-16.351

Compression fitting

for Alu/PEX multi-layer pipe according to DIN 16836. Female thread connection Rp1/2.Nickel-plated brass.

Compression fitting

for Alu/PEX multi-layer pipe according to DIN 16836.
Female thread connection Rp1/2.
Nickel-plated brass.

Ø Pipe		Article No
16x2	4024052138616	1335-16.351

for copper or precision steel pipe according to DIN EN 1057/10305-1/2. Connection male thread G3/4 according to DIN EN 16313 (Eurocone). Metal-to-metal joint. Nickel-plated brass. With a pipe wall thickness of 0.8-1 mm insert supporting sleeves. Heed pipe manufacturer’s technical advice.

Compression fitting

for copper or precision steel pipe according to DIN EN 1057/10305-1/2.
Connection male thread G3/4 according to DIN EN 16313 (Eurocone).
Metal-to-metal joint.
Nickel-plated brass.
With a pipe wall thickness of 0.8-1 mm insert supporting sleeves. Heed pipe manufacturer’s technical advice.

Ø Pipe	EAN	Article No
12	4024052214211	3831-12.351
14	4024052214310	3831-14.351
15	4024052214617	3831-15.351
16	4024052214914	3831-16.351
18	4024052215218	3831-18.351

Compression fitting

for copper or precision steel pipe according to DIN EN 1057/10305-1/2. Connection male thread G3/4 according to DIN EN 16313 (Eurocone). Metal-to-metal joint. Nickel-plated brass. With a pipe wall thickness of 0.8-1 mm insert supporting sleeves. Heed pipe manufacturer’s technical advice.

Compression fitting

Ø Pipe	EAN	Article No
12	4024052214211	3831-12.351
14	4024052214310	3831-14.351
15	4024052214617	3831-15.351
16	4024052214914	3831-16.351
18	4024052215218	3831-18.351

for copper or precision steel pipe according to DIN EN 1057/10305-1/2. Female thread connection Rp1/2.Metal-to-metal joint. Brass nickel-plated.Support sleeves should be used for a pipe wall thickness of 0.8 – 1 mm. Follow the specifications of the pipe manufacturer.

Compression fitting

for copper or precision steel pipe according to DIN EN 1057/10305-1/2.
Female thread connection Rp1/2.
Metal-to-metal joint.
Brass nickel-plated.
Support sleeves should be used for a pipe wall thickness of 0.8 – 1 mm. Follow the specifications of the pipe manufacturer.

Ø Pipe	EAN	Article No
15	4024052175017	2201-15.351
16	4024052175116	2201-16.351

Compression fitting

for copper or precision steel pipe according to DIN EN 1057/10305-1/2. Female thread connection Rp1/2.Metal-to-metal joint. Brass nickel-plated.Support sleeves should be used for a pipe wall thickness of 0.8 – 1 mm. Follow the specifications of the pipe manufacturer.

Compression fitting

Ø Pipe	EAN	Article No
15	4024052175017	2201-15.351
16	4024052175116	2201-16.351

As spare part for return temperature limiter RTL without presetting.

RTL thermostatic head

As spare part for return temperature limiter RTL without presetting.

Colour	EAN	Article No
white RAL 9016	4024052275311	6500-00.500

RTL thermostatic head

As spare part for return temperature limiter RTL without presetting.

RTL thermostatic head

As spare part for return temperature limiter RTL without presetting.

Colour	EAN	Article No
white RAL 9016	4024052275311	6500-00.500

for copper or precision steel pipe according to DIN EN 1057/10305-1/2 and stainless steel pipe. Connection male thread G3/4 according to DIN EN 16313 (Eurocone). Soft sealed, max. 95°C. Nickel-plated brass.

Compression fitting

for copper or precision steel pipe according to DIN EN 1057/10305-1/2 and stainless steel pipe.
Connection male thread G3/4 according to DIN EN 16313 (Eurocone).
Soft sealed, max. 95°C.
Nickel-plated brass.

Ø Pipe	EAN	Article No
15	4024052515851	1313-15.351
18	4024052516056	1313-18.351

Compression fitting

for copper or precision steel pipe according to DIN EN 1057/10305-1/2 and stainless steel pipe. Connection male thread G3/4 according to DIN EN 16313 (Eurocone). Soft sealed, max. 95°C. Nickel-plated brass.

Compression fitting

Ø Pipe	EAN	Article No
15	4024052515851	1313-15.351
18	4024052516056	1313-18.351

for plastic pipe according to DIN 4726, ISO 10508. PE-X: DIN 16892/16893, EN ISO 15875; PB: DIN 16968/16969. Connection male thread G3/4 according to DIN EN 16313 (Eurocone). Nickel-plated brass.

Compression fitting

for plastic pipe according to DIN 4726, ISO 10508. PE-X: DIN 16892/16893, EN ISO 15875; PB: DIN 16968/16969.
Connection male thread G3/4 according to DIN EN 16313 (Eurocone).
Nickel-plated brass.

Ø Pipe	EAN	Article No
12x1,1	4024052136018	1315-12.351
14x2	4024052134618	1311-14.351
16x1,5	4024052136117	1315-16.351
16x2	4024052134816	1311-16.351
17x2	4024052134915	1311-17.351
18x2	4024052135110	1311-18.351
20x2	4024052135318	1311-20.351

Compression fitting

for plastic pipe according to DIN 4726, ISO 10508. PE-X: DIN 16892/16893, EN ISO 15875; PB: DIN 16968/16969. Connection male thread G3/4 according to DIN EN 16313 (Eurocone). Nickel-plated brass.

Compression fitting

for plastic pipe according to DIN 4726, ISO 10508. PE-X: DIN 16892/16893, EN ISO 15875; PB: DIN 16968/16969.
Connection male thread G3/4 according to DIN EN 16313 (Eurocone).
Nickel-plated brass.

Ø Pipe	EAN	Article No
12x1,1	4024052136018	1315-12.351
14x2	4024052134618	1311-14.351
16x1,5	4024052136117	1315-16.351
16x2	4024052134816	1311-16.351
17x2	4024052134915	1311-17.351
18x2	4024052135110	1311-18.351
20x2	4024052135318	1311-20.351

for copper or precision steel pipe with a 1 mm wall thickness. Brass.

Support sleeve

for copper or precision steel pipe with a 1 mm wall thickness.
Brass.

Ø Pipe	L	EAN	Article No
12	25,0	4024052127016	1300-12.170
15	26,0	4024052127917	1300-15.170
16	26,3	4024052128419	1300-16.170
18	26,8	4024052128815	1300-18.170

Support sleeve

for copper or precision steel pipe with a 1 mm wall thickness. Brass.

Support sleeve

for copper or precision steel pipe with a 1 mm wall thickness.
Brass.

Ø Pipe	L	EAN	Article No
12	25,0	4024052127016	1300-12.170
15	26,0	4024052127917	1300-15.170
16	26,3	4024052128419	1300-16.170
18	26,8	4024052128815	1300-18.170

For thermostatic valve bodies with II marking, from 2012 and II+ marking, from 2015.

Thermostatic insert V-exact II with stepless precision presetting

For thermostatic valve bodies with II marking, from 2012 and II+ marking, from 2015.

Retrofitting/ Replacement inserts For DN valve	EAN	Article No
10, 15, 20	4024052841417	3700-02.300

Thermostatic insert V-exact II with stepless precision presetting

For thermostatic valve bodies with II marking, from 2012 and II+ marking, from 2015.

Thermostatic insert V-exact II with stepless precision presetting

For thermostatic valve bodies with II marking, from 2012 and II+ marking, from 2015.

Retrofitting/ Replacement inserts For DN valve	EAN	Article No
10, 15, 20	4024052841417	3700-02.300

Since 2012 (II marking on the valve body). With 25 mm brass sleeve.

Insert for RTL

Since 2012 (II marking on the valve body). With 25 mm brass sleeve.

EAN	Article No
4024052909711	1305-02.300

Insert for RTL

Since 2012 (II marking on the valve body). With 25 mm brass sleeve.

Insert for RTL

Since 2012 (II marking on the valve body). With 25 mm brass sleeve.

EAN	Article No
4024052909711	1305-02.300

For thermostatic valve bodies with boss marking, from 1994 to end of 2011. With yellow label. Also suitable for reversed flow direction.

Thermostatic insert V-exakt with precision presetting

For thermostatic valve bodies with boss marking, from 1994 to end of 2011.
With yellow label. Also suitable for reversed flow direction.

Retrofitting/ Replacement inserts For DN valve	EAN	Article No
10, 15	4024052737611	3502-24.300
(also for DN 20 V-exakt valve bodies)

Note: After retrofitting to thermostatic inserts with presetting the appropriate RTL thermostatic head Article No 6510-00.500 has to be used.

Thermostatic insert V-exakt with precision presetting

For thermostatic valve bodies with boss marking, from 1994 to end of 2011. With yellow label. Also suitable for reversed flow direction.

Thermostatic insert V-exakt with precision presetting

For thermostatic valve bodies with boss marking, from 1994 to end of 2011.
With yellow label. Also suitable for reversed flow direction.

Retrofitting/ Replacement inserts For DN valve	EAN	Article No
10, 15	4024052737611	3502-24.300
(also for DN 20 V-exakt valve bodies)

Note: After retrofitting to thermostatic inserts with presetting the appropriate RTL thermostatic head Article No 6510-00.500 has to be used.

for Alu/PEX multi-layer pipe according to DIN 16836. Connection male thread G3/4 according to DIN EN 16313 (Eurocone).Nickel-plated brass.

Compression fitting

for Alu/PEX multi-layer pipe according to DIN 16836.
Connection male thread G3/4 according to DIN EN 16313 (Eurocone).
Nickel-plated brass.

Ø Pipe	EAN	Article No
16x2	4024052137312	1331-16.351

Compression fitting

for Alu/PEX multi-layer pipe according to DIN 16836. Connection male thread G3/4 according to DIN EN 16313 (Eurocone).Nickel-plated brass.

Compression fitting

for Alu/PEX multi-layer pipe according to DIN 16836.
Connection male thread G3/4 according to DIN EN 16313 (Eurocone).
Nickel-plated brass.

Ø Pipe	EAN	Article No
16x2	4024052137312	1331-16.351

for thermostatic valve bodies with II+ marking, from 2015.

Thermostatic insert Eclipse with automatic flow limitation

for thermostatic valve bodies with II+ marking, from 2015.

Retrofitting/ Replacement inserts For DN valve	EAN	Article No
10, 15, 20	4024052940912	3930-02.300

Thermostatic insert Eclipse with automatic flow limitation

for thermostatic valve bodies with II+ marking, from 2015.

Thermostatic insert Eclipse with automatic flow limitation

for thermostatic valve bodies with II+ marking, from 2015.

Retrofitting/ Replacement inserts For DN valve	EAN	Article No
10, 15, 20	4024052940912	3930-02.300

Brass, nickel-plated.

Spindle extension for RTL

Brass, nickel-plated.

L	EAN	Article No
20	4024052500215	9153-20.700

Spindle extension for RTL

Brass, nickel-plated.

Spindle extension for RTL

Brass, nickel-plated.

L	EAN	Article No
20	4024052500215	9153-20.700

for RTL thermostatic head 6510-00.500

Replacement heat transfer piece

for RTL thermostatic head 6510-00.500

EAN	Article No
4024052952113	6510-00.433

Replacement heat transfer piece

for RTL thermostatic head 6510-00.500

Replacement heat transfer piece

for RTL thermostatic head 6510-00.500

EAN	Article No
4024052952113	6510-00.433

Photos

1305-02-300

Select a format Download

9174-02-800

Select a format Download

RTL-9174-02-800

Select a format Download

Frontpage-9173-02-800

Select a format Download

9153-02-800

Select a format Download

9173-02-800

Select a format Download

6510-00-433

Select a format Download

Cut-RTL

Select a format Download

9153-20-700

Select a format Download

9154-02-800

Select a format Download

6500-00-500

Select a format Download

Documentation

Technical specifications

RTL_EN_lq.pdf Download

Installation instructions

Legal documents

Conformity_Declaration_RTL.pdf Download

Drawings 2D/3D

RTL

Return temperature limiter with and without presetting

Models with presetting and automatic flow limitation (AFC)

Body made of corrosion-resistant gunmetal

Stainless spindle with double O-ring seal

Outer O-ring can be replaced while under pressure

Concealed limiting or blocking using stop clips

Applications area:

Functions:

Control behavior:

Dimensions:

Pressure class:

Temperature:

Maximum sensor temperature:

Specific extension:

Flow range Eclipse:

Differential pressure (ΔpV) Eclipse:

Material:

Surface treatment:

Marking:

Colour:

Pipe connection:

Axial Download

Axial

Straight Download

Straight

RTL Thermostatic head for reverse-flow temperature white RAL 9016. With heat transfer piece expecially for thermostatic radiator valves. Download

RTL Thermostatic head for reverse-flow temperature

Axial Download

Axial

RTL Thermostatic head for reverse-flow temperature white RAL 9016. With heat transfer piece expecially for thermostatic radiator valves. Download

RTL Thermostatic head for reverse-flow temperature

Straight Download

Straight

Axial Download

Axial

Axial Download

Axial

Straight Download

Straight

Straight Download

Straight

Compression fitting for Alu/PEX multi-layer pipe according to DIN 16836. Female thread connection Rp1/2.Nickel-plated brass. Download

Compression fitting

Compression fitting

Compression fitting for copper or precision steel pipe according to DIN EN 1057/10305-1/2. Female thread connection Rp1/2.Metal-to-metal joint. Brass nickel-plated.Support sleeves should be used for a pipe wall thickness of 0.8 – 1 mm. Follow the specifications of the pipe manufacturer. Download

Compression fitting

RTL thermostatic head As spare part for return temperature limiter RTL without presetting. Download

RTL thermostatic head

Compression fitting for copper or precision steel pipe according to DIN EN 1057/10305-1/2 and stainless steel pipe. Connection male thread G3/4 according to DIN EN 16313 (Eurocone). Soft sealed, max. 95°C. Nickel-plated brass. Download

Compression fitting

Compression fitting for plastic pipe according to DIN 4726, ISO 10508. PE-X: DIN 16892/16893, EN ISO 15875; PB: DIN 16968/16969. Connection male thread G3/4 according to DIN EN 16313 (Eurocone). Nickel-plated brass. Download

Compression fitting

Support sleeve for copper or precision steel pipe with a 1 mm wall thickness. Brass. Download

Support sleeve

Thermostatic insert V-exact II with stepless precision presetting For thermostatic valve bodies with II marking, from 2012 and II+ marking, from 2015. Download

Thermostatic insert V-exact II with stepless precision presetting

Insert for RTL Since 2012 (II marking on the valve body). With 25 mm brass sleeve. Download

Insert for RTL

Thermostatic insert V-exakt with precision presetting For thermostatic valve bodies with boss marking, from 1994 to end of 2011. With yellow label. Also suitable for reversed flow direction. Download

Thermostatic insert V-exakt with precision presetting

Compression fitting for Alu/PEX multi-layer pipe according to DIN 16836. Connection male thread G3/4 according to DIN EN 16313 (Eurocone).Nickel-plated brass. Download

Compression fitting

Thermostatic insert Eclipse with automatic flow limitation for thermostatic valve bodies with II+ marking, from 2015. Download

Thermostatic insert Eclipse with automatic flow limitation

Spindle extension for RTL Brass, nickel-plated. Download

Spindle extension for RTL

Replacement heat transfer piece for RTL thermostatic head 6510-00.500 Download

Replacement heat transfer piece

1305-02-300

9174-02-800

RTL-9174-02-800

Frontpage-9173-02-800

9153-02-800

9173-02-800

6510-00-433

Cut-RTL

9153-20-700

9154-02-800

6500-00-500

white RAL 9016. With heat transfer piece expecially for thermostatic radiator valves.

white RAL 9016. With heat transfer piece expecially for thermostatic radiator valves.

for Alu/PEX multi-layer pipe according to DIN 16836. Female thread connection Rp1/2.Nickel-plated brass.

for copper or precision steel pipe according to DIN EN 1057/10305-1/2. Female thread connection Rp1/2.Metal-to-metal joint. Brass nickel-plated.Support sleeves should be used for a pipe wall thickness of 0.8 – 1 mm. Follow the specifications of the pipe manufacturer.

As spare part for return temperature limiter RTL without presetting.

for copper or precision steel pipe according to DIN EN 1057/10305-1/2 and stainless steel pipe. Connection male thread G3/4 according to DIN EN 16313 (Eurocone). Soft sealed, max. 95°C. Nickel-plated brass.

for plastic pipe according to DIN 4726, ISO 10508. PE-X: DIN 16892/16893, EN ISO 15875; PB: DIN 16968/16969. Connection male thread G3/4 according to DIN EN 16313 (Eurocone). Nickel-plated brass.

for copper or precision steel pipe with a 1 mm wall thickness. Brass.

For thermostatic valve bodies with II marking, from 2012 and II+ marking, from 2015.

Since 2012 (II marking on the valve body). With 25 mm brass sleeve.

For thermostatic valve bodies with boss marking, from 1994 to end of 2011. With yellow label. Also suitable for reversed flow direction.

for Alu/PEX multi-layer pipe according to DIN 16836. Connection male thread G3/4 according to DIN EN 16313 (Eurocone).Nickel-plated brass.

for thermostatic valve bodies with II+ marking, from 2015.

Brass, nickel-plated.

for RTL thermostatic head 6510-00.500