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    LK Armatur is a leading producer in Europe, manufactures millions of valves per year for the global HVAC market. Our solutions are based on a comprehensive view of how valves, control units, components and prefabricated products work together. Svenska English Deutsch Italiano Yкраїнська Suomi

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    Our PEX Pipe Extrusion business area is an innovative manufacturer of high-quality plastic pipes for the heating and plumbing industry. Our core is the efficient, high-technology production process for crosslinked PE-Xa pipes, resulting in products with a unique combination of flexibility and hydrostatic strength. English

  • LK Group

    LK is a family-owned trading and production group, operating on a global scale within the HVAC-area. We are the market leader in Sweden and has an increasing sales of products, systems and solutions in the Nordic countries, Europe and the USA. Svenska English
LK 551 HydroMix

LK 551 HydroMix

  • Anti-scald function
  • Adjustable temperature

LK 551 HydroMix is an asymmetrical mixing valve for water heating and heating systems. The mixing valve has a thermostatic element that regulates the supply of cold as well as hot water in order to achieve the ...

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LK 551 HydroMix

  • Variants
  • Detailed Information
  • Documentation
  • Videos
  • Accessories & Spare parts

Variants

LK 551 - Female thread

LK 551 - Female thread 7 variants

Article Dim. Kvs m³/h A mm B mm C mm D mm Note Weight (kg) Dimensional sketch Item List
181616 F ½" 1,5 70 99 43.5 45 25 - 45 °C 0.5
181617 F ¾" 1,6 70 99 43.5 45 25 - 45 °C 0.5
181455 F ½" 1,5 70 99 43.5 45 35 - 65 °C 0.5
181486 F ¾" 1,6 70 99 43.5 45 35 - 65 °C 0.5
182203 F 1" 3,5 84 121 62 55 10 - 30 °C 0.9
182204 F 1" 4,2 84 121 62 55 25 - 45 °C 0.9
182205 F 1 " 3,5 84 121 62 55 35 - 65 °C 0.9

181616

Dim. F ½"
Kvs m³/h 1,5
A mm 70
B mm 99
C mm 43.5
D mm 45
Note 25 - 45 °C
Weight (kg) 0.5
Dimensional sketch
Item list

181617

Dim. F ¾"
Kvs m³/h 1,6
A mm 70
B mm 99
C mm 43.5
D mm 45
Note 25 - 45 °C
Weight (kg) 0.5
Dimensional sketch
Item list

181455

Dim. F ½"
Kvs m³/h 1,5
A mm 70
B mm 99
C mm 43.5
D mm 45
Note 35 - 65 °C
Weight (kg) 0.5
Dimensional sketch
Item list

181486

Dim. F ¾"
Kvs m³/h 1,6
A mm 70
B mm 99
C mm 43.5
D mm 45
Note 35 - 65 °C
Weight (kg) 0.5
Dimensional sketch
Item list

182203

Dim. F 1"
Kvs m³/h 3,5
A mm 84
B mm 121
C mm 62
D mm 55
Note 10 - 30 °C
Weight (kg) 0.9
Dimensional sketch
Item list

182204

Dim. F 1"
Kvs m³/h 4,2
A mm 84
B mm 121
C mm 62
D mm 55
Note 25 - 45 °C
Weight (kg) 0.9
Dimensional sketch
Item list

182205

Dim. F 1 "
Kvs m³/h 3,5
A mm 84
B mm 121
C mm 62
D mm 55
Note 35 - 65 °C
Weight (kg) 0.9
Dimensional sketch
Item list
LK 551 - Male thread

LK 551 - Male thread 14 variants

Article Dim. Kvs m³/h A mm B mm C mm D mm Note CO₂-EQ. (Kg) Weight (kg) Dimensional sketch Item List
181618 M ½" 1,3 70 42.5 99 45 25 - 45 °C 1.05812226 0.4
181619 M ¾" 1,5 70 43.5 99 45 25 - 45 °C 1.13041636 0.5
181738 M ¾" 1,5 70 43.5 99 45 10 - 30 °C 1.13588699 0.5
181620 M 1" 1,6 70 43.5 99 45 25 - 45 °C 1.22956064 0.5
181452 M ½" 1,3 70 42.5 99 45 35 - 65 °C 0.98598737 0.4
181453 M ¾" 1,5 70 43.5 99 45 35 - 65 °C 1.05826417 0.5
181454 M 1" 1,6 70 43.5 99 45 35 - 65 °C 1.15652733 0.5
182736 M 1" 1,6 70 43.5 99 45 35 - 65 °C *, WRAS 1.13710835 0.5
182197 M 1" 3,5 84 62 121 55 10 - 30 °C 1.6516826 0.7
182198 M 1" 3,5 84 62 121 55 25 - 45 °C 1.78455881 0.7
182199 M 1" 3,5 84 62 121 55 35 - 65 °C 1.76249682 0.7
182200 M 1¼" 3,5 84 62 121 55 10 - 30 °C 1.99820827 0.8
182201 M 1¼" 4,2 84 62 121 55 25 - 45 °C 2.02107851 0.8
182202 M 1¼" 3,5 84 62 121 55 35 - 65 °C 1.99923391 0.8

181618

Dim. M ½"
Kvs m³/h 1,3
A mm 70
B mm 42.5
C mm 99
D mm 45
Note 25 - 45 °C
CO₂-EQ. (Kg) 1.05812226
Weight (kg) 0.4
Dimensional sketch
Item list

181619

Dim. M ¾"
Kvs m³/h 1,5
A mm 70
B mm 43.5
C mm 99
D mm 45
Note 25 - 45 °C
CO₂-EQ. (Kg) 1.13041636
Weight (kg) 0.5
Dimensional sketch
Item list

181738

Dim. M ¾"
Kvs m³/h 1,5
A mm 70
B mm 43.5
C mm 99
D mm 45
Note 10 - 30 °C
CO₂-EQ. (Kg) 1.13588699
Weight (kg) 0.5
Dimensional sketch
Item list

181620

Dim. M 1"
Kvs m³/h 1,6
A mm 70
B mm 43.5
C mm 99
D mm 45
Note 25 - 45 °C
CO₂-EQ. (Kg) 1.22956064
Weight (kg) 0.5
Dimensional sketch
Item list

181452

Dim. M ½"
Kvs m³/h 1,3
A mm 70
B mm 42.5
C mm 99
D mm 45
Note 35 - 65 °C
CO₂-EQ. (Kg) 0.98598737
Weight (kg) 0.4
Dimensional sketch
Item list

181453

Dim. M ¾"
Kvs m³/h 1,5
A mm 70
B mm 43.5
C mm 99
D mm 45
Note 35 - 65 °C
CO₂-EQ. (Kg) 1.05826417
Weight (kg) 0.5
Dimensional sketch
Item list

181454

Dim. M 1"
Kvs m³/h 1,6
A mm 70
B mm 43.5
C mm 99
D mm 45
Note 35 - 65 °C
CO₂-EQ. (Kg) 1.15652733
Weight (kg) 0.5
Dimensional sketch
Item list

182736

Dim. M 1"
Kvs m³/h 1,6
A mm 70
B mm 43.5
C mm 99
D mm 45
Note 35 - 65 °C *, WRAS
CO₂-EQ. (Kg) 1.13710835
Weight (kg) 0.5
Dimensional sketch
Item list

182197

Dim. M 1"
Kvs m³/h 3,5
A mm 84
B mm 62
C mm 121
D mm 55
Note 10 - 30 °C
CO₂-EQ. (Kg) 1.6516826
Weight (kg) 0.7
Dimensional sketch
Item list

182198

Dim. M 1"
Kvs m³/h 3,5
A mm 84
B mm 62
C mm 121
D mm 55
Note 25 - 45 °C
CO₂-EQ. (Kg) 1.78455881
Weight (kg) 0.7
Dimensional sketch
Item list

182199

Dim. M 1"
Kvs m³/h 3,5
A mm 84
B mm 62
C mm 121
D mm 55
Note 35 - 65 °C
CO₂-EQ. (Kg) 1.76249682
Weight (kg) 0.7
Dimensional sketch
Item list

182200

Dim. M 1¼"
Kvs m³/h 3,5
A mm 84
B mm 62
C mm 121
D mm 55
Note 10 - 30 °C
CO₂-EQ. (Kg) 1.99820827
Weight (kg) 0.8
Dimensional sketch
Item list

182201

Dim. M 1¼"
Kvs m³/h 4,2
A mm 84
B mm 62
C mm 121
D mm 55
Note 25 - 45 °C
CO₂-EQ. (Kg) 2.02107851
Weight (kg) 0.8
Dimensional sketch
Item list

182202

Dim. M 1¼"
Kvs m³/h 3,5
A mm 84
B mm 62
C mm 121
D mm 55
Note 35 - 65 °C
CO₂-EQ. (Kg) 1.99923391
Weight (kg) 0.8
Dimensional sketch
Item list

* Material, valve body: EN 12165 CW625N

LK 551 - Compression fitting

LK 551 - Compression fitting 11 variants

Article Dim. Kvs m³/h A mm B mm C mm D mm Note CO₂-EQ. (Kg) Weight (kg) Dimensional sketch Item List
181621 15 mm 1,3 86.5 51 106 45 25 - 45 °C 1.14549601 0.4
181622 22 mm 1,6 85 52 106 45 25 - 45 °C 1.2464639 0.4
181523 15 mm 1,3 86.5 51 106 45 35 - 55 °C 1.06805993 0.5
181487 22 mm 1,6 85 52 106 45 35 - 55 °C 1.16887216 0.6
181456 15 mm 1,3 86.5 51 106 45 35 - 65 °C 1.07340344 0.5
182738 15 mm 1,3 86.5 51 106 45 35 - 65 °C *, WRAS 1.07721514 0,5
181457 22 mm 1,6 85 52 106 45 35 - 65 °C 1.1723013 0.6
182737 22 mm 1,6 85 52 106 45 35 - 65 °C *, WRAS 1.11163343 0,6
182206 28 mm 3,5 110 80 138 55 10 - 30 °C * 2.18532797 0.9
182207 28 mm 4,2 110 80 138 55 25 - 45 °C * 2.20838675 0.9
182208 28 mm 3,5 110 80 138 55 35 - 65 °C * 2.21129602 0.9

181621

Dim. 15 mm
Kvs m³/h 1,3
A mm 86.5
B mm 51
C mm 106
D mm 45
Note 25 - 45 °C
CO₂-EQ. (Kg) 1.14549601
Weight (kg) 0.4
Dimensional sketch
Item list

181622

Dim. 22 mm
Kvs m³/h 1,6
A mm 85
B mm 52
C mm 106
D mm 45
Note 25 - 45 °C
CO₂-EQ. (Kg) 1.2464639
Weight (kg) 0.4
Dimensional sketch
Item list

181523

Dim. 15 mm
Kvs m³/h 1,3
A mm 86.5
B mm 51
C mm 106
D mm 45
Note 35 - 55 °C
CO₂-EQ. (Kg) 1.06805993
Weight (kg) 0.5
Dimensional sketch
Item list

181487

Dim. 22 mm
Kvs m³/h 1,6
A mm 85
B mm 52
C mm 106
D mm 45
Note 35 - 55 °C
CO₂-EQ. (Kg) 1.16887216
Weight (kg) 0.6
Dimensional sketch
Item list

181456

Dim. 15 mm
Kvs m³/h 1,3
A mm 86.5
B mm 51
C mm 106
D mm 45
Note 35 - 65 °C
CO₂-EQ. (Kg) 1.07340344
Weight (kg) 0.5
Dimensional sketch
Item list

182738

Dim. 15 mm
Kvs m³/h 1,3
A mm 86.5
B mm 51
C mm 106
D mm 45
Note 35 - 65 °C *, WRAS
CO₂-EQ. (Kg) 1.07721514
Weight (kg) 0,5
Dimensional sketch
Item list

181457

Dim. 22 mm
Kvs m³/h 1,6
A mm 85
B mm 52
C mm 106
D mm 45
Note 35 - 65 °C
CO₂-EQ. (Kg) 1.1723013
Weight (kg) 0.6
Dimensional sketch
Item list

182737

Dim. 22 mm
Kvs m³/h 1,6
A mm 85
B mm 52
C mm 106
D mm 45
Note 35 - 65 °C *, WRAS
CO₂-EQ. (Kg) 1.11163343
Weight (kg) 0,6
Dimensional sketch
Item list

182206

Dim. 28 mm
Kvs m³/h 3,5
A mm 110
B mm 80
C mm 138
D mm 55
Note 10 - 30 °C *
CO₂-EQ. (Kg) 2.18532797
Weight (kg) 0.9
Dimensional sketch
Item list

182207

Dim. 28 mm
Kvs m³/h 4,2
A mm 110
B mm 80
C mm 138
D mm 55
Note 25 - 45 °C *
CO₂-EQ. (Kg) 2.20838675
Weight (kg) 0.9
Dimensional sketch
Item list

182208

Dim. 28 mm
Kvs m³/h 3,5
A mm 110
B mm 80
C mm 138
D mm 55
Note 35 - 65 °C *
CO₂-EQ. (Kg) 2.21129602
Weight (kg) 0.9
Dimensional sketch
Item list

* Material, valve body: EN 12165 CW625N

LK 551 - Rotating nut

LK 551 - Rotating nut 2 variants

Article Dim. Dim. 2 Kvs m³/h A mm B mm C mm D mm Note CO₂-EQ. (Kg) Weight (kg) Dimensional sketch Item List
182431 M 1¼" 1½" Rotating nut 3,5 84 62 121 55 25 - 45 °C 2.02634561 0.9
182820 M 1¼" 1½" Rotating nut 3,5 84 62 121 55 50 - 70 °C 2.05633606 0.9

182431

Dim. M 1¼"
Dim. 2 1½" Rotating nut
Kvs m³/h 3,5
A mm 84
B mm 62
C mm 121
D mm 55
Note 25 - 45 °C
CO₂-EQ. (Kg) 2.02634561
Weight (kg) 0.9
Dimensional sketch
Item list

182820

Dim. M 1¼"
Dim. 2 1½" Rotating nut
Kvs m³/h 3,5
A mm 84
B mm 62
C mm 121
D mm 55
Note 50 - 70 °C
CO₂-EQ. (Kg) 2.05633606
Weight (kg) 0.9
Dimensional sketch
Item list

Detailed Information

Description

LK 551 HydroMix is an asymmetrical mixing valve for water heating and heating systems. The mixing valve has a thermostatic element that regulates the supply of cold as well as hot water in order to achieve the desired ­temperature. The valve has an anti-scald function that shuts off the ­incoming hot water flow in case of failure of cold water supply.

Arrows on the valve body indicate the direction of the flow.
C = incoming cold water
H = incoming hot water
M = outgoing mixed water

When fitted on top of boiler/storage tanks with built-in water heaters the valve should be installed with some space between boiler/storage tank and valve so as not to let the function of the valve be affected by heat radiation.

The valve knob is used to set the desired warm water temperature within the specified range. The ­protective cap prevents unintentional changes of the ­temperature setting.

The valve requires no maintenance but the installation should be checked regularly.

Technical Data

Max. working pressure: 1.0 MPa (10 bar)
Working temperature: Min. 5 °C/Max. 65 °C
Min. 5 °C/Max. 95 °C
Operating temperature: Min. 10 °C/Max. 30 °C (Max. 65 °C)
Min. 25 °C/Max. 45 °C
Min. 35 °C/Max. 55 °C
Min. 35 °C/Max. 65 °C
Thread standard: Rp - female thread, G - male thread
Media 1: Water - Glycol mixture max. 50% Ethanol mixture max. 30%
Material, valve body: Brass EN 12165 CW617N
Temperature stability: ±3 °C

Application

Technical Diagrams

Capacity Diagram

Documentation

Product sheet

LK 551 HydroMix

Instruction manual

551 HydroMix Connection kit - Instruction_148815

Instruction manual

551 HydroMix H-kvs - Instruction_248138

Certificate/Type approval

WRAS approval_551 HydroMix.pdf

Instruction manual

551 HydroMix - Instruction_Wras_148752

Instruction manual

551 HydroMix Repair kit - Instruction_148816

Instruction manual

248398 LK 551 HydroMix Instruction

Instruction manual

248382_LK 551 HydroMix_Sparepart_Instruction

Accessories & Spare parts

Article no. Article Position
095234 Repair kit 551, 35 - 65 °C (Kvs 1.6) 1
095235 Repair kit 551, 25 - 45 °C 1
095236 Repair kit 551, 35 - 55°C 1
095348 Repair kit 551, 10 - 30 °C, Kvs 3.2-4.2 1
095349 Repair kit 551, 25 - 45 °C, Kvs 3.2-4.2 1
095350 Repair kit 551, 35 - 65 °C, Kvs 3.2-4.2 1
092055 Connection kit M ½" x ¾" with rotating nut, gaskets, 2 check valves 2
092054 Connection kit M ½" x ¾" with rotating nut, gaskets, 1 check valve 2
092052 Connection kit M ¾" x 1" with rotating nut, gaskets, 1 check valve 2
092053 Connection kit M ¾" x 1" with rotating nut, gaskets, 2 check valves 2
092333 Connection kit M 1" x 1¼" with rotating nut, gaskets, 1 check valve 2
092334 Connection kit M 1" x 1¼" with rotating nut, gaskets, 2 check valves 2
187310 LK Insulation, 551 (Kvs 3.2-4.2) / 552 3
187304 LK Insulation, 551 (Kvs 1.3-1.6) 3

Videos

LK 551 HydroMix