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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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LK 840 ThermoMix® 2.0

LK 840 ThermoMix® 2.0

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

LK 840 ThermoMix® 2.0 is a 3-way mixing valve which can be used as a mixing or diverting valve in heating systems.

LK 840 ThermoMix® 2.0

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

Variants

LK 840 2.0 - Female thread

LK 840 2.0 - Female thread 9 variants

Article Dim. Kvs m³/h A mm B mm C mm D mm E mm F mm Weight (kg) Dimensional sketch Item List
181908 F ½" 0,6 70 35 69 18 29 81 0.5
181909 F ½" 1,0 70 35 69 18 29 81 0.5
181910 F ½" 1,6 70 35 69 18 29 81 0.5
181911 F ½" 2,5 70 35 69 18 29 81 0.5
181912 F ¾" 4,0 70 35 69 18 29 81 0.5
181913 F ¾" 6,3 70 35 69 18 29 81 0.5
181914 F 1" 6,3 70 35 69 20 29 83 0.5
181915 F 1" 10,0 70 35 69 20 29 83 0.5
181916 F 1¼" 16,0 84 42 77 24 32 90 0.8

181908

Dim. F ½"
Kvs m³/h 0,6
A mm 70
B mm 35
C mm 69
D mm 18
E mm 29
F mm 81
Weight (kg) 0.5
Dimensional sketch
Item list

181909

Dim. F ½"
Kvs m³/h 1,0
A mm 70
B mm 35
C mm 69
D mm 18
E mm 29
F mm 81
Weight (kg) 0.5
Dimensional sketch
Item list

181910

Dim. F ½"
Kvs m³/h 1,6
A mm 70
B mm 35
C mm 69
D mm 18
E mm 29
F mm 81
Weight (kg) 0.5
Dimensional sketch
Item list

181911

Dim. F ½"
Kvs m³/h 2,5
A mm 70
B mm 35
C mm 69
D mm 18
E mm 29
F mm 81
Weight (kg) 0.5
Dimensional sketch
Item list

181912

Dim. F ¾"
Kvs m³/h 4,0
A mm 70
B mm 35
C mm 69
D mm 18
E mm 29
F mm 81
Weight (kg) 0.5
Dimensional sketch
Item list

181913

Dim. F ¾"
Kvs m³/h 6,3
A mm 70
B mm 35
C mm 69
D mm 18
E mm 29
F mm 81
Weight (kg) 0.5
Dimensional sketch
Item list

181914

Dim. F 1"
Kvs m³/h 6,3
A mm 70
B mm 35
C mm 69
D mm 20
E mm 29
F mm 83
Weight (kg) 0.5
Dimensional sketch
Item list

181915

Dim. F 1"
Kvs m³/h 10,0
A mm 70
B mm 35
C mm 69
D mm 20
E mm 29
F mm 83
Weight (kg) 0.5
Dimensional sketch
Item list

181916

Dim. F 1¼"
Kvs m³/h 16,0
A mm 84
B mm 42
C mm 77
D mm 24
E mm 32
F mm 90
Weight (kg) 0.8
Dimensional sketch
Item list
LK 840 2.0 - Female thread

LK 840 2.0 - 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
181917 F 1½" 25,0 106 53 88 33 43 110 1.4
181918 F 2" 40,0 106 53 88 33 43 110 1.6

181917

Dim. F 1½"
Kvs m³/h 25,0
A mm 106
B mm 53
C mm 88
D mm 33
E mm 43
F mm 110
Weight (kg) 1.4
Dimensional sketch
Item list

181918

Dim. F 2"
Kvs m³/h 40,0
A mm 106
B mm 53
C mm 88
D mm 33
E mm 43
F mm 110
Weight (kg) 1.6
Dimensional sketch
Item list
LK 840 2.0 - Male thread

LK 840 2.0 - 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
181919 M ¾" 2,5 80 40 74 18 29 81 0.6
181920 M 1" 4,0 80 40 74 18 29 81 0.6
181921 M 1" 6,3 80 40 74 18 29 81 0.6
181922 M 1¼" 10,0 82 41 75 20 29 83 0.6
181923 M 1½" 16,0 84 42 77 24 32 90 0.8

181919

Dim. M ¾"
Kvs m³/h 2,5
A mm 80
B mm 40
C mm 74
D mm 18
E mm 29
F mm 81
Weight (kg) 0.6
Dimensional sketch
Item list

181920

Dim. M 1"
Kvs m³/h 4,0
A mm 80
B mm 40
C mm 74
D mm 18
E mm 29
F mm 81
Weight (kg) 0.6
Dimensional sketch
Item list

181921

Dim. M 1"
Kvs m³/h 6,3
A mm 80
B mm 40
C mm 74
D mm 18
E mm 29
F mm 81
Weight (kg) 0.6
Dimensional sketch
Item list

181922

Dim. M 1¼"
Kvs m³/h 10,0
A mm 82
B mm 41
C mm 75
D mm 20
E mm 29
F mm 83
Weight (kg) 0.6
Dimensional sketch
Item list

181923

Dim. M 1½"
Kvs m³/h 16,0
A mm 84
B mm 42
C mm 77
D mm 24
E mm 32
F mm 90
Weight (kg) 0.8
Dimensional sketch
Item list
LK 840 2.0 - Male thread

LK 840 2.0 - Male thread 3 variants

Article Dim. Kvs m³/h A mm B mm C mm D mm E mm F mm Weight (kg) Dimensional sketch Item List
181924 M 2" 25,0 124 62 97 33 43 110 1.4
181925 M 2" 32,0 124 62 97 33 43 110 1.4
181926 M 2" 45,0 124 62 97 33 43 110 1.4

181924

Dim. M 2"
Kvs m³/h 25,0
A mm 124
B mm 62
C mm 97
D mm 33
E mm 43
F mm 110
Weight (kg) 1.4
Dimensional sketch
Item list

181925

Dim. M 2"
Kvs m³/h 32,0
A mm 124
B mm 62
C mm 97
D mm 33
E mm 43
F mm 110
Weight (kg) 1.4
Dimensional sketch
Item list

181926

Dim. M 2"
Kvs m³/h 45,0
A mm 124
B mm 62
C mm 97
D mm 33
E mm 43
F mm 110
Weight (kg) 1.4
Dimensional sketch
Item list
LK 840 2.0 - Compression Fitting

LK 840 2.0 - Compression Fitting 1 artikel

Article Dim. Kvs m³/h A mm B mm C mm D mm E mm F mm Weight (kg) Dimensional sketch Item List
181932 28 mm 6,3 120 60 94 18 29 81 0.7

181932

Dim. 28 mm
Kvs m³/h 6,3
A mm 120
B mm 60
C mm 94
D mm 18
E mm 29
F mm 81
Weight (kg) 0.7
Dimensional sketch
Item list

Other dimensions on request.

LK 840 Set - Female thread - LK 950 / LK 100 SmartComfort CT

LK 840 Set - Female thread - LK 950 / LK 100 SmartComfort CT 5 variants

Article Type Dim. Kvs m³/h A mm B mm C mm Weight (kg) Dimensional sketch Item List
182759 LK 950 (180759) F ¾" 6,3 143 80 93 1.0
182760 LK 950 (180759) F 1" 6,3 145 80 93 1.0
182761 LK 950 (180759) F 1" 10,0 145 80 93 1.0
182762 LK 100 (181242) F ¾" 6,3 149 84 97 1.0
182763 LK 100 (181242) F 1" 10,0 151 84 97 1.0

182759

Type LK 950 (180759)
Dim. F ¾"
Kvs m³/h 6,3
A mm 143
B mm 80
C mm 93
Weight (kg) 1.0
Dimensional sketch
Item list

182760

Type LK 950 (180759)
Dim. F 1"
Kvs m³/h 6,3
A mm 145
B mm 80
C mm 93
Weight (kg) 1.0
Dimensional sketch
Item list

182761

Type LK 950 (180759)
Dim. F 1"
Kvs m³/h 10,0
A mm 145
B mm 80
C mm 93
Weight (kg) 1.0
Dimensional sketch
Item list

182762

Type LK 100 (181242)
Dim. F ¾"
Kvs m³/h 6,3
A mm 149
B mm 84
C mm 97
Weight (kg) 1.0
Dimensional sketch
Item list

182763

Type LK 100 (181242)
Dim. F 1"
Kvs m³/h 10,0
A mm 151
B mm 84
C mm 97
Weight (kg) 1.0
Dimensional sketch
Item list
LK 850 HG - Male thread / Rotating nut

New

LK 850 HG - Male thread / Rotating nut 1 artikel

Article Dim. Kvs m³/h A mm B mm C mm D mm E mm F mm Weight (kg) Dimensional sketch Item List
182765 G 1" x G 1" x F 1" Rotating nut 6,3/10,0 78.5 44 88 25,4 28.6 88.1 0.65

182765

Dim. G 1" x G 1" x F 1" Rotating nut
Kvs m³/h 6,3/10,0
A mm 78.5
B mm 44
C mm 88
D mm 25,4
E mm 28.6
F mm 88.1
Weight (kg) 0.65
Dimensional sketch
Item list
LK 840 HG - Male thread / Rotating nut

New

LK 840 HG - Male thread / Rotating nut 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
182766 M 1½” x M 1¼” x F 1½” Rotating nut 6,3 41 63 104 25,6 28.8 89 0.7
182767 M 1½” x M 1¼” x F 1½” Rotating nut 10,0 41 63 104 25,6 28.8 89 0.7

182766

Dim. M 1½” x M 1¼” x F 1½” Rotating nut
Kvs m³/h 6,3
A mm 41
B mm 63
C mm 104
D mm 25,6
E mm 28.8
F mm 89
Weight (kg) 0.7
Dimensional sketch
Item list

182767

Dim. M 1½” x M 1¼” x F 1½” Rotating nut
Kvs m³/h 10,0
A mm 41
B mm 63
C mm 104
D mm 25,6
E mm 28.8
F mm 89
Weight (kg) 0.7
Dimensional sketch
Item list

Detailed Information

Description

LK 840 ThermoMix® 2.0 is a 3-way mixing valve which can be used as a mixing or diverting valve in heating systems.

LK 840 ThermoMix® 2.0 is a 3-way mixing valve which can be used as a mixing or diverting valve in heating systems.
The valve is suitable for motorization and can be fitted with insulation. For more information, see the insulation data sheet.

A compact design and a octagonal key grip gives an easier access and installation in tight spaces. The valve can be installed in any position and LK 840 ThermoMix® 2.0 can easily be adapted for right- or left-hand mounting.

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

Technical Data

Working temperature: Min. 5 °C/Max. 110 °C (120 °C briefly)
Ambient temperature: Min. 5 °C/Max. 60 °C
Max. working pressure: 1.0 MPa (10 bar)
Max. differential pressure: 100 kPa (1 bar)
Leakage: < 0,2% of Kvs at 100 kPa
Angle of rotation: 90°/360°
Torque: < 1 Nm (DN15-32)* < 2,1-2,3 Nm (DN40-50)*
Media 1: Water - Glycol mixture max. 50% Ethanol mixture max. 30%
Thread standard: Rp - female thread, G - male thread
Material, valve body: Brass EN 12165 CW617N
Material, internal cover: PPS Composite
Material, slide/spindle: Brass EN 12165 CW617N
Other data: * Double torque if the valve is used diverting.
Other data: Material external cover DN 15-32 Aluminium, DN 40-50 Composite
Material, sealing: EPDM
Spindle sealing: Two O-rings

Application

Technical Diagrams

Valve Characteristics

CAPACITY DIAGRAM

Documentation

Product sheet

LK 840 ThermoMix® 2.0

Instruction manual

840 ThermoMix 2.0 - Instruction_248059

Instruction manual

840 ThermoMix 2.0 DN 40_50 - Instruction_248060

Certificate/Type approval

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

Applications

Biofuel ENG

Applications

Solar heating ENG

Applications

District heating ENG

Applications

Water jacketed stove ENG

Applications

Heat pump ENG

Accessories & Spare parts

Article no. Article Position
187187 Sealing kit LK 840/841 DN 15-20 1
187188 Sealing kit LK 840/841 DN 25 1
187197 Sealing kit 840/841 2.0, DN 32 1
187190 Repair kit LK 840 DN 15-20 2
187191 Repair kit 840 DN 25 2
187192 Repair kit LK 840 DN 32 2
187189 Sealing kit 840/841 2.0, DN 40-50 3
187193 Repair kit LK 840 DN 40-50 4
187107 Insulation, DN 15-20 5
187108 Insulation, DN 25-32 5

Videos

LK 840 2.0 - Mounting the slide
LK 840 ThermoMix® 2.0 - Rotation of slide
LK 950 & LK 840 2.0 ThermoMix®