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  • LK Group

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LK 841 ThermoMix®

Internal

LK 841 ThermoMix®

  • Suitable for motorization.
  • Broad product range.
  • Low internal leakage

LK 841 ThermoMix® is a 4-way mixing valve suited for heating systems in which a high return temperature is needed to avoid corrosion, thus prolonging the life-time of the heat source. LK 841 ThermoMix® is suit...

Read more

LK 841 ThermoMix®

  • Variants
  • Detailed Information
  • Documentation
  • Accessories & Spare parts
  • Questions & Answers

Variants

LK 841 - Female thread

LK 841 - Female thread 6 variants

Article Dim. Kvs m³/h A mm B mm C mm D mm E mm F mm Weight (kg) Dimensional sketch Item List
180862 F ½" 2,5 80 40 80 20 28 82 0.7
180863 F ¾" 4,0 80 40 80 20 28 82 0.7
180864 F ¾" 6,3 80 40 80 20 28 82 0.7
180865 F 1" 8,0 82 41 82 22 31 87 0.8
180866 F 1" 12 82 41 82 22 31 87 0.8
180867 F 1¼" 15 84 42 84 25 32 91 0.9

180862

Dim. F ½"
Kvs m³/h 2,5
A mm 80
B mm 40
C mm 80
D mm 20
E mm 28
F mm 82
Weight (kg) 0.7
Dimensional sketch
Item list

180863

Dim. F ¾"
Kvs m³/h 4,0
A mm 80
B mm 40
C mm 80
D mm 20
E mm 28
F mm 82
Weight (kg) 0.7
Dimensional sketch
Item list

180864

Dim. F ¾"
Kvs m³/h 6,3
A mm 80
B mm 40
C mm 80
D mm 20
E mm 28
F mm 82
Weight (kg) 0.7
Dimensional sketch
Item list

180865

Dim. F 1"
Kvs m³/h 8,0
A mm 82
B mm 41
C mm 82
D mm 22
E mm 31
F mm 87
Weight (kg) 0.8
Dimensional sketch
Item list

180866

Dim. F 1"
Kvs m³/h 12
A mm 82
B mm 41
C mm 82
D mm 22
E mm 31
F mm 87
Weight (kg) 0.8
Dimensional sketch
Item list

180867

Dim. F 1¼"
Kvs m³/h 15
A mm 84
B mm 42
C mm 84
D mm 25
E mm 32
F mm 91
Weight (kg) 0.9
Dimensional sketch
Item list
LK 841 - Female thread

LK 841 - Female thread 2 variants

Article Dim. Kvs m³/h A mm B mm C mm D mm E mm F mm Weight (kg) Dimensional sketch Item List
181198 F 1½" 24 118 59 118 30 36 100 2.3
181199 F 2" 40 127 63.5 127 35 40 109 2.7

181198

Dim. F 1½"
Kvs m³/h 24
A mm 118
B mm 59
C mm 118
D mm 30
E mm 36
F mm 100
Weight (kg) 2.3
Dimensional sketch
Item list

181199

Dim. F 2"
Kvs m³/h 40
A mm 127
B mm 63.5
C mm 127
D mm 35
E mm 40
F mm 109
Weight (kg) 2.7
Dimensional sketch
Item list
LK 841 - Male thread

LK 841 - Male thread 5 variants

Article Dim. Kvs m³/h A mm B mm C mm D mm E mm F mm Weight (kg) Dimensional sketch Item List
180869 M 1" 4,0 80 40 80 20 28 82 0.7
180870 M 1" 6,3 80 40 80 20 28 82 0.7
180871 M 1¼" 8,0 82 41 82 22 31 87 0.8
180872 M 1¼" 12 82 41 82 22 31 87 0.8
180873 M 1½" 15 84 42 84 24 32 90 0.9

180869

Dim. M 1"
Kvs m³/h 4,0
A mm 80
B mm 40
C mm 80
D mm 20
E mm 28
F mm 82
Weight (kg) 0.7
Dimensional sketch
Item list

180870

Dim. M 1"
Kvs m³/h 6,3
A mm 80
B mm 40
C mm 80
D mm 20
E mm 28
F mm 82
Weight (kg) 0.7
Dimensional sketch
Item list

180871

Dim. M 1¼"
Kvs m³/h 8,0
A mm 82
B mm 41
C mm 82
D mm 22
E mm 31
F mm 87
Weight (kg) 0.8
Dimensional sketch
Item list

180872

Dim. M 1¼"
Kvs m³/h 12
A mm 82
B mm 41
C mm 82
D mm 22
E mm 31
F mm 87
Weight (kg) 0.8
Dimensional sketch
Item list

180873

Dim. M 1½"
Kvs m³/h 15
A mm 84
B mm 42
C mm 84
D mm 24
E mm 32
F mm 90
Weight (kg) 0.9
Dimensional sketch
Item list
LK 841 - Compression fitting

LK 841 - Compression fitting 5 variants

Article Dim. Kvs m³/h A mm B mm C mm D mm E mm F mm Weight (kg) Dimensional sketch Item List
180874 15 mm 2,5 114 57 114 20 28 82 1.0
180875 18 mm 2,5 114 57 114 20 28 82 1.2
180876 22 mm 2,5 114 57 114 20 28 82 1.0
180877 28 mm 4,0 120 60 120 20 28 82 1.0
180878 28 mm 6,3 120 60 120 20 28 82 1.0

180874

Dim. 15 mm
Kvs m³/h 2,5
A mm 114
B mm 57
C mm 114
D mm 20
E mm 28
F mm 82
Weight (kg) 1.0
Dimensional sketch
Item list

180875

Dim. 18 mm
Kvs m³/h 2,5
A mm 114
B mm 57
C mm 114
D mm 20
E mm 28
F mm 82
Weight (kg) 1.2
Dimensional sketch
Item list

180876

Dim. 22 mm
Kvs m³/h 2,5
A mm 114
B mm 57
C mm 114
D mm 20
E mm 28
F mm 82
Weight (kg) 1.0
Dimensional sketch
Item list

180877

Dim. 28 mm
Kvs m³/h 4,0
A mm 120
B mm 60
C mm 120
D mm 20
E mm 28
F mm 82
Weight (kg) 1.0
Dimensional sketch
Item list

180878

Dim. 28 mm
Kvs m³/h 6,3
A mm 120
B mm 60
C mm 120
D mm 20
E mm 28
F mm 82
Weight (kg) 1.0
Dimensional sketch
Item list

Detailed Information

Description

LK 841 ThermoMix® is a 4-way mixing valve suited for heating systems in which a high return temperature is needed to avoid corrosion, thus prolonging the life-time of the heat source.

LK 841 ThermoMix® is suitable for motorization.

LK 841 can be equipped with an insulation - see under Acessories. For more information, please see the product sheet for insulations.

The valve can be mounted at any angle. LK 841 ThermoMix® can easily be adapted for right- or left-hand mounting.

Technical Data

Angle of rotation: 90°
Torque: < 1 Nm
Leakage: < 1.5% of Kvs at 50 kPa
Max. working pressure: 1.0 MPa (10 bar)
Max. differential pressure: 50 kPa (0,5 bar)
Working temperature: Min. 5 °C/Max. 110 °C (120 °C briefly)
Ambient temperature: Min. 5 °C/Max. 60 °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
Material, internal cover: PPS Composite
Material, external cover: Aluminium
Material, slide/spindle: Brass EN 12165 CW617N
Material, sealing: EPDM
Spindle sealing: Two O-rings

Application

Technical Diagrams

Valve Characteristics

Capacity Diagram

Documentation

Product sheet

LK 841 ThermoMix®

Instruction manual

841 ThermoMix DN 40_50 - Instruction_148577

Instruction manual

Insulation 820, 821, 822, 840, 841 - Instruction_148693

Instruction manual

841 ThermoMix - Instruction_048613

Certificate/Type approval

CE Declaration of Conformity - 830, 831, 840, 841, 842, 845, 846.pdf

Accessories & Spare parts

Article no. Article Position
187066 Sealing kit 811/840/841, DN 15-20 1
187067 Sealing kit 840/841/842, DN 25-32 1
187069 Repair kit 841, DN 15-20 2
187071 Repair kit 841/842, DN 25-32 2
187107 Insulation, DN 15-20 3
187108 Insulation, DN 25-32 3
187078 Sealing kit 840/841, DN 40-50 4
187080 Repair kit 841, DN 40-50 5

Questions & Answers

Is the LK SmartComfort compatible with a mixing valve from another manufacturer?

Yes, we provide mounting kits for other models, see Mounting kits on our website.

30 September 2024