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LK 840 ThermoMix®

Internal

LK 840 ThermoMix®

LK 840 ThermoMix® is a 3-way valve which can be used as a mixing valve or as a diverting valve in heating systems. LK 840 ThermoMix® is suitable for motorization. LK 840 can be equipped with an insulation - s...

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LK 840 ThermoMix®

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

Variants

LK 840 - Female thread

LK 840 - Female thread 8 variants

Article Dim. Kvs m³/h A mm B mm C mm D mm E mm F mm Weight (kg) Dimensional sketch Item List
181010 F ½" 0,6 80 40 75 20 28 82 0.7
181011 F ½" 1,0 80 40 75 20 28 82 0.7
180845 F ½" 2,5 80 40 75 20 28 82 0.7
180846 F ¾" 4,0 80 40 75 20 28 82 0.7
180847 F ¾" 6,3 80 40 75 20 28 82 0.7
181350 F 1" 6,3 82 41 76 22 31 87 0.8
180849 F 1" 12 82 41 76 22 31 87 0.8
180850 F 1¼" 15 84 42 77 25 32 91 0.9

181010

Dim. F ½"
Kvs m³/h 0,6
A mm 80
B mm 40
C mm 75
D mm 20
E mm 28
F mm 82
Weight (kg) 0.7
Dimensional sketch
Item list

181011

Dim. F ½"
Kvs m³/h 1,0
A mm 80
B mm 40
C mm 75
D mm 20
E mm 28
F mm 82
Weight (kg) 0.7
Dimensional sketch
Item list

180845

Dim. F ½"
Kvs m³/h 2,5
A mm 80
B mm 40
C mm 75
D mm 20
E mm 28
F mm 82
Weight (kg) 0.7
Dimensional sketch
Item list

180846

Dim. F ¾"
Kvs m³/h 4,0
A mm 80
B mm 40
C mm 75
D mm 20
E mm 28
F mm 82
Weight (kg) 0.7
Dimensional sketch
Item list

180847

Dim. F ¾"
Kvs m³/h 6,3
A mm 80
B mm 40
C mm 75
D mm 20
E mm 28
F mm 82
Weight (kg) 0.7
Dimensional sketch
Item list

181350

Dim. F 1"
Kvs m³/h 6,3
A mm 82
B mm 41
C mm 76
D mm 22
E mm 31
F mm 87
Weight (kg) 0.8
Dimensional sketch
Item list

180849

Dim. F 1"
Kvs m³/h 12
A mm 82
B mm 41
C mm 76
D mm 22
E mm 31
F mm 87
Weight (kg) 0.8
Dimensional sketch
Item list

180850

Dim. F 1¼"
Kvs m³/h 15
A mm 84
B mm 42
C mm 77
D mm 25
E mm 32
F mm 91
Weight (kg) 0.9
Dimensional sketch
Item list

The valve is also available with the bevel of the spindle rotated 180° (Design E). For more information please contact our Sales Department.

LK 840 - Female thread

LK 840 - 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
181196 F 1½" 24 118 59 95 30 36 100 2.1
181197 F 2" 40 127 63.5 100 35 40 109 2.4

181196

Dim. F 1½"
Kvs m³/h 24
A mm 118
B mm 59
C mm 95
D mm 30
E mm 36
F mm 100
Weight (kg) 2.1
Dimensional sketch
Item list

181197

Dim. F 2"
Kvs m³/h 40
A mm 127
B mm 63.5
C mm 100
D mm 35
E mm 40
F mm 109
Weight (kg) 2.4
Dimensional sketch
Item list
LK 840 - Male thread

LK 840 - Male 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
180851 M ¾" 2,5 80 40 75 20 28 82 0.7
180852 M 1" 4,0 80 40 75 20 28 82 0.7
180853 M 1" 6,3 80 40 75 20 28 82 0.7
180854 M 1¼" 8,0 82 41 76 22 31 87 0.8
180855 M 1¼" 12 82 41 76 22 31 87 0.8
180856 M 1½" 15 84 42 77 24 32 90 0.9

180851

Dim. M ¾"
Kvs m³/h 2,5
A mm 80
B mm 40
C mm 75
D mm 20
E mm 28
F mm 82
Weight (kg) 0.7
Dimensional sketch
Item list

180852

Dim. M 1"
Kvs m³/h 4,0
A mm 80
B mm 40
C mm 75
D mm 20
E mm 28
F mm 82
Weight (kg) 0.7
Dimensional sketch
Item list

180853

Dim. M 1"
Kvs m³/h 6,3
A mm 80
B mm 40
C mm 75
D mm 20
E mm 28
F mm 82
Weight (kg) 0.7
Dimensional sketch
Item list

180854

Dim. M 1¼"
Kvs m³/h 8,0
A mm 82
B mm 41
C mm 76
D mm 22
E mm 31
F mm 87
Weight (kg) 0.8
Dimensional sketch
Item list

180855

Dim. M 1¼"
Kvs m³/h 12
A mm 82
B mm 41
C mm 76
D mm 22
E mm 31
F mm 87
Weight (kg) 0.8
Dimensional sketch
Item list

180856

Dim. M 1½"
Kvs m³/h 15
A mm 84
B mm 42
C mm 77
D mm 24
E mm 32
F mm 90
Weight (kg) 0.9
Dimensional sketch
Item list
LK 840 - Male thread

LK 840 - Male thread 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
181519 M 2" 24 124 62 98 30 36 100 2.1

181519

Dim. M 2"
Kvs m³/h 24
A mm 124
B mm 62
C mm 98
D mm 30
E mm 36
F mm 100
Weight (kg) 2.1
Dimensional sketch
Item list
LK 840 - Compression fitting

LK 840 - Compression fitting 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
180857 15 mm 2,5 114 57 92 20 28 82 0.8
180858 18 mm 2,5 114 57 92 20 28 82 0.8
180859 22 mm 2,5 114 57 92 20 28 82 0.8
180893 22 mm 6,3 87 44 78 20 28 82 0.8
180860 28 mm 4,0 120 60 95 20 28 82 0.8
180861 28 mm 6,3 120 60 95 20 28 82 0.8

180857

Dim. 15 mm
Kvs m³/h 2,5
A mm 114
B mm 57
C mm 92
D mm 20
E mm 28
F mm 82
Weight (kg) 0.8
Dimensional sketch
Item list

180858

Dim. 18 mm
Kvs m³/h 2,5
A mm 114
B mm 57
C mm 92
D mm 20
E mm 28
F mm 82
Weight (kg) 0.8
Dimensional sketch
Item list

180859

Dim. 22 mm
Kvs m³/h 2,5
A mm 114
B mm 57
C mm 92
D mm 20
E mm 28
F mm 82
Weight (kg) 0.8
Dimensional sketch
Item list

180893

Dim. 22 mm
Kvs m³/h 6,3
A mm 87
B mm 44
C mm 78
D mm 20
E mm 28
F mm 82
Weight (kg) 0.8
Dimensional sketch
Item list

180860

Dim. 28 mm
Kvs m³/h 4,0
A mm 120
B mm 60
C mm 95
D mm 20
E mm 28
F mm 82
Weight (kg) 0.8
Dimensional sketch
Item list

180861

Dim. 28 mm
Kvs m³/h 6,3
A mm 120
B mm 60
C mm 95
D mm 20
E mm 28
F mm 82
Weight (kg) 0.8
Dimensional sketch
Item list

Detailed Information

Description

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

LK 840 ThermoMix® is suitable for motorization.

LK 840 can be equipped with an insulation - see under Accessories. For more information, please see the product sheet for insulations.

The valve can be mounted at any angle. LK 840 ThermoMix® can easily be adapted for right- or left-hand mounting.

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: 50 kPa ( 0.5 bar)
Leakage: < 1% of Kvs at 50 kPa
Angle of rotation: 90°/360°
Torque: < 1 Nm
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, 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 840 ThermoMix®

Instruction manual

840 ThermoMix - Instruction_ 048612

Instruction manual

840 ThermoMix DN 40_50 - Instruction_148576

Instruction manual

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

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
187068 Repair kit 840, DN 15-20 2
187070 Repair kit 840, 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
187079 Repair kit 840, DN 40 5
187116 Repair kit 840, DN 50 5

Videos

LK SmartComfort mounted on a LK 840 ThermoMix®
LK 840 ThermoMix® - Changing the sealingkit

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.