VTA321, Internal thread VTA322, External thread VTA323, Compression fitting VTA522, External thread VTA522, With adapters - external thread VTA523, With adapters - compression fitting
VTA321, Internal thread VTA322, External thread VTA323, Compression fitting VTA522, External thread VTA522, With adapters - external thread VTA523, With adapters - compression fitting

Thermostatic mixing valve

VTA320, VTA520

The series VTA320/VTA520 for domestic hot water distribution, anti-scalded tempering in line applications and where further temperature control devices have been installed at the water taps. These series of valves are also suitable for domestic hot water installations equipped with HWC (hot water circulation).
  • Anti-scald and anti-legionella protection.
  • Accuracy of regulation.
  • Suitable for HWC (hot water circulation).

Product range

VTA520 front_A-01
VTA520 side_A-01
VTA520 koppel front_A-01
VTA522, VTA523 with adapters
VTA520 koppel side_A-01
Series VTA321, Internal thread
Art.no.ReferenceTemperature range °CKvs** Kvs-value in m3/h at a pressure drop of 1 bar.ConnectionA mmB mmC mmD mmWeight kgNoteNTCNTC = National Trade Code
31100300VTA32120-431.5Rp 1/2"704252460.45Replaces 472L. 
31100700VTA32120-431.6Rp 3/4"704252460.48Replaces 474L. 
31100400VTA32135-601.5Rp 1/2"704252460.45Replaces 406 
31100800VTA32135-601.6Rp 3/4"704252460.48Replaces 407 
Series VTA322/VTA522, External thread
Art.no.ReferenceTemperature range °CKvs** Kvs-value in m3/h at a pressure drop of 1 bar.ConnectionA mmB mmC mmD mmWeight kgNoteNTCNTC = National Trade Code
31102800VTA32220-431.2G 1/2"704252460.41Replaces 410L. 
31100500VTA32220-431.5G 3/4"704252460.45Replaces 471L. 
31100900VTA32220-431.6G 1"704252460.48Replaces 475L. 
31620100VTA52220-433.2G 1"846260560.86Replaces 31301600. 
31620400VTA52220-433.5G 1 1/4"846260560.95  
31103200VTA32230-701.6G 1"704252460.53  
31102900VTA32235-601.2G 1/2"704252460.41  
31100600VTA32235-601.5G 3/4"704252460.45Replaces 471 
31101000VTA32235-601.6G 1"704252460.48Replaces 475 
31104700VTA32245-651.6G 1"704252460.55  
31620200VTA52245-653.2G 1"846260560.86Replaces 31301200. 
31620500VTA52245-653.5G 1 1/4"846260560.95  
31620300VTA52250-753.2G 1"846260560.86  
31620600VTA52250-753.5G 1 1/4"846260560.95  
Series VTA323, Compression fitting
Art.no.ReferenceTemperature range °CKvs** Kvs-value in m3/h at a pressure drop of 1 bar.ConnectionA mmB mmC mmD mmWeight kgNoteNTCNTC = National Trade Code
31102600VTA32320-431.2CPF 15 mm865052460.49A non-return valve for the cold water is included. Replaces 401L. 
31100100VTA32320-431.5CPF 22 mm865052460.57A non-return valve for the cold water is included. Replaces 470L 
31102700VTA32335-601.2CPF 15 mm865052460.49A non-return valve for the cold water is included. 
31103900VTA32335-601.5CPF 18 mm865052460.66  
31100200VTA32335-601.5CPF 22 mm865052460.57A non-return valve for the cold water is included. Replaces 470. 
Series VTA522/VTA523, with adapters
Art.no.ReferenceTemperature range °CKvs** Kvs-value in m3/h at a pressure drop of 1 bar.ConnectionA mmB mmC mmD mmWeight kgNoteNTCNTC = National Trade Code
31620700VTA52220-433.0R ¾"1549760561.22Two check valves for both hot and cold water are included. 
31621300VTA52320-433.0CPF 22 mm18011060561.42Two check valves for both hot and cold water are included. 
31621000VTA52220-433.4R 1"16410260561.59Two check valves for both hot and cold water are included. 
31621600VTA52320-433.4CPF 28 mm20412260561.90Two check valves for both hot and cold water are included. Replaces 31300700, 476L. 
31620800VTA52245-653.0R ¾"1549760561.22Two check valves for both hot and cold water are included. 
31621400VTA52345-653.0CPF 22 mm18011060561.42Two check valves for both hot and cold water are included. 
31621100VTA52245-653.4R 1"16410260561.59Two check valves for both hot and cold water are included. 
31621700VTA52345-653.4CPF 28 mm20412260561.90Two check valves for both hot and cold water are included. Replaces 31300100, 476, 416. 
31620900VTA52250-753.0R ¾"1549760561.22Two check valves for both hot and cold water are included. 
31621500VTA52350-753.0CPF 22 mm18011060561.42Two check valves for both hot and cold water are included. 
31621200VTA52250-753.4R 1"16410260561.59Two check valves for both hot and cold water are included. 

Installation support

Operation
VTA320_GB_A-01
VTA320
VTA520 VTS520_GB_A-01
VTS520
Installation examples
VTA320_VTA520_1-01
VTA520/VTA320
VTA320_VTA520_2-01
VTA520
Installation instruction VTA320
Installation instruction VTA520

Technical data

Suitable application area
Recommended
  • Potable water, in line
Secondary alternative
  • Floor heating
  • Radiator heating
Technical data
Pressure class: PN 10 
Working pressure: 1.0 MPa
Max. differential pressure, Mixing: 0.3 MPa
Capacity diagram: see product catalogue 
Media temperature, VTA320, VTA520, max.: 95 °C
VTA520 temporarily, max.: 100 °C
Temperature stability VTA320: ± 2 °C
VTA520: ± 4 °C
Connection, Internal thread (Rp): EN 10226-1 
External thread (G): ISO 228/1 
External thread (R): EN 10226-1 
Compression fitting (CPF): EN 1254-2 
Material, Valve housing and other metal parts with fluid contact: Dezincification resistant brass, DZR 
Conformity PED 2014/68/EU, article 4.3 
Valves are designed for VT320_520
Conformity Low Lead_100x128_utgA-01
HCACL/4MS UBAList
KTW/WRAS/ACS

Accessories and spare parts

Connection kits
ImageArt.no.ReferenceDesignationNational trade codeNoteData sheetInstructions manual

KCD313

Connection kit with compression fittings for use on externally threaded valves.
36552800KCD313Valve thread G ¾" - Connection CPF 15mm Two check valves included. Suits series VTS522, VTS552, VTA331, VTA532, VTA362, VTA562, VTA322, VTA522, VTA352, VTA552, VTA372, VTA572, VMC312. 

KCD313

Connection kit with compression fittings for use on externally threaded valves.
36553100KCD313Valve thread G ¾" - Connection CPF 15mm Two check valves included. Nickel-plated. Suits series VTS522, VTS552, VTA331, VTA532, VTA362, VTA562, VTA322, VTA522, VTA352, VTA552, VTA372, VTA572, VMC312. 

KCD313

Connection kit with compression fittings for use on externally threaded valves.
36552900KCD313Valve thread G1" - Connection CPF 22mm Two check valves included. Suits series VTS522, VTS552, VTA331, VTA532, VTA362, VTA562, VTA322, VTA522, VTA352, VTA552, VTA372, VTA572, VMC312. 

KCD313

Connection kit with compression fittings for use on externally threaded valves.
36553200KCD313Valve thread G1" - Connection CPF 22mm Two check valves included. Nickel-plated. Suits series VTS522, VTS552, VTA331, VTA532, VTA362, VTA562, VTA322, VTA522, VTA352, VTA552, VTA372, VTA572, VMC312. 

KCD313

Connection kit with compression fittings for use on externally threaded valves.
36553000KCD313Valve thread G 1¼" - Connection CPF 28mm Two check valves included. Suits series VTS522, VTS552, VTA331, VTA532, VTA362, VTA562, VTA322, VTA522, VTA352, VTA552, VTA372, VTA572, VMC312. 

KCD313

Connection kit with compression fittings for use on externally threaded valves.
36553300KCD313Valve thread G 1¼" - Connection CPF 28mm Two check valves included. Nickel-plated. Suits series VTS522, VTS552, VTA331, VTA532, VTA362, VTA562, VTA322, VTA522, VTA352, VTA552, VTA372, VTA572, VMC312.  

KSD314

Connection kit with solder connection for use on externally threaded valves.
36553400KSD314Valve thread G1" - Connection 22mm Two check valves included. Suits series VTS522, VTS552, VTA331, VTA532, VTA362, VTA562, VTA322, VTA522, VTA352, VTA552, VTA372, VTA572, VMC312. 

KTD212

Connection kit with external thread for use on externally threaded valves.
36552200KTD212Valve thread G 1" - Connection thread R ¾" One check valves included. Suits series VTS522, VTS552, VTA331, VTA532, VTA362, VTA562, VTA322, VTA522, VTA352, VTA552, VTA372, VTA572, VMC312. 

KTD312

Connection kit with external thread for use on externally threaded valves.
36552400KTD312Valve thread G 1" - Connection thread R ¾" Two check valves included. Suits series VTS522, VTS552, VTA331, VTA532, VTA362, VTA562, VTA322, VTA522, VTA352, VTA552, VTA372, VTA572, VMC312. 

KTD312

Connection kit with external thread for use on externally threaded valves.
36552600KTD312Valve thread G 1" - Connection thread R ¾" Two check valves included. Nickel-plated. Suits series VTS522, VTS552, VTA331, VTA532, VTA362, VTA562, VTA322, VTA522, VTA352, VTA552, VTA372, VTA572, VMC312. 

KTD212

Connection kit with external thread for use on externally threaded valves.
36552300KTD212Valve thread G 1¼" - Connection thread R 1" One check valves included. Suits series VTS522, VTS552, VTA331, VTA532, VTA362, VTA562, VTA322, VTA522, VTA352, VTA552, VTA372, VTA572, VMC312. 

KTD312

Connection kit with external thread for use on externally threaded valves.
36552500KTD312Valve thread G 1¼" - Connection thread R 1" Two check valves included. Suits series VTS522, VTS552, VTA331, VTA532, VTA362, VTA562, VTA322, VTA522, VTA352, VTA552, VTA372, VTA572, VMC312. 

KTD312

Connection kit with external thread for use on externally threaded valves.
36552700KTD312Valve thread G 1¼" - Connection thread R 1" Two check valves included. Nickel-plated. Suits series VTS522, VTS552, VTA331, VTA532, VTA362, VTA562, VTA322, VTA522, VTA352, VTA552, VTA372, VTA572, VMC312. 
Spare parts
ImageArt.no.ReferenceDesignationNational trade codeNoteData sheetInstructions manual

VTA932

Exchange kit VTA932, 35 - 60°C.
37000400VTA932Exchange kit, 35 - 60°C   

VTA932

Exchange kit VTA932, 20 - 43°C.
37000500VTA932Exchange kit, 20 - 43°C   

VTA932

Exchange kit VTA932, 30 - 70°C
37001300VTA932Exchange kit, 30 - 70°C   

VTA903

Top knob VTA903, series VTA300.
98080420VTA903Top knob, series VTA300    

VTA903

Adjusting knob VTA903, series VTA300.
98080480VTA903Adjusting knob, series VTA300    

VTA952

Exchange kit VTA952, series VTA520, 20 - 43°C.
37100100VTA952Exchange kit series VTA520, 20 - 43°C   

VTA952

Exchange kit VTA952, series VTA520, 45 - 65°C.
37100200VTA952Exchange kit series VTA520, 45 - 65°C   

VTA952

Exchange kit VTA952, series VTA520, 50 - 75°C.
37100300VTA952Exchange kit series VTA520, 50 - 75°C   

Download area

Find here direct related product information for download. If you don’t find your specific need here please look further into below mentioned "Quick links" or this website's “Search” and “Support” area.
Data Sheet VTA320, VTA520
Installation instruction VTA320
Installation Instruction VTA520
2D Image VTA520
3D drawing (stp file) VTA321 Rp ½"
3D drawing (stp file) VTA321 Rp ¾"
3D drawing (stp file) VTA322 G ¾"
3D drawing (stp file) VTA322 G 1"
3D drawing (stp file) VTA323 CPF 22mm
3D drawing (stp file) VTA522 G 1"
3D drawing (stp file) VTA522 G 1¼"
3D drawing (stp file) VTA523 CPF 22mm
3D drawing (stp file) VTA522 R ¾"
3D drawing (stp file) VTA522 R 1"

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Quick Links