VTC311, Internal thread VTC312, External thread VTC317, Pump flange and external thread VTC318, Rotating nut and external thread
VTC311, Internal thread VTC312, External thread VTC317, Pump flange and external thread VTC318, Rotating nut and external thread

Load valve

VTC300

The series VTC300 is a compact and accurate load valve used for solid fuel boilers up to 30 kW. The load valve makes sure that the boiler gets up to a high combustion temperature so as to ensure the lowest possible emissions. Above all, the valves make sure that the return temperature to the boiler is kept high and guaranteed over the entire combustion cycle which enables a higher level of boiler efficiency, reduced tarring and increased life span of the boiler.
  • Accurate control of the return water temperature.
  • Easy installation. No need of adjustment valve.
  • Easy but normally not required maintenance.

Product range

VTC312 front_A-01
VTC311, VTC312
VTC312 side_A-01
VTC317 front_A-01
VTC317, VTC318
VTC317 side_A-01
VTC317
Series VTC311, Internal thread
Art.no.ReferenceDNKvs** Kvs-value in m3/h at a pressure drop of 1 bar.ConnectionOpening temperatureA mmB mmC mmD mmWeight kgNTCNTC = National Trade Code
51000100VTC311203.2Rp 3/4"45 ± 2°C704242460.53 
51000200VTC311203.2Rp 3/4"55 ± 2°C704242460.53 
51000300VTC311203.2Rp 3/4"60 ± 2°C704242460.53 
51000400VTC311203.2Rp 3/4"70 ± 2°C704242460.53 
51000500VTC311203.2Rp 3/4"80 ± 2°C704242460.53 
Series VTC312, External thread
Art.no.ReferenceDNKvs** Kvs-value in m3/h at a pressure drop of 1 bar.ConnectionOpening temperatureA mmB mmC mmD mmWeight kgNTCNTC = National Trade Code
51000800VTC312152.8G 3/4"45 ± 2°C704242460.48 
51000900VTC312152.8G 3/4"55 ± 2°C704242460.48 
51001000VTC312152.8G 3/4"60 ± 2°C704242460.48 
51001100VTC312152.8G 3/4"70 ± 2°C704242460.48 
51001200VTC312152.8G 3/4"80 ± 2°C704242460.48 
51001500VTC312203.2G 1"45 ± 2°C704242460.51 
51001600VTC312203.2G 1"55 ± 2°C704242460.51 
51001700VTC312203.2G 1"60 ± 2°C704242460.51 
51001800VTC312203.2G 1"70 ± 2°C704242460.51 
51001900VTC312203.2G 1"80 ± 2°C704242460.51 
Series VTC317, Pump flange and external thread
Art.no.ReferenceDNKvs** Kvs-value in m3/h at a pressure drop of 1 bar.ConnectionOpening temperatureA mmB mmC mmD mmWeight kgNTCNTC = National Trade Code
51002200VTC317203.2PF 1 1/2", G 1"45 ± 2°C754242570.57 
51002300VTC317203.2PF 1 1/2", G 1"55 ± 2°C754242570.57 
51002400VTC317203.2PF 1 1/2", G 1"60 ± 2°C754242570.57 
51002500VTC317203.2PF 1 1/2", G 1"70 ± 2°C754242570.57 
51002600VTC317203.2PF 1 1/2", G 1"80 ± 2°C754242570.57 
Series VTC318, Rotating nut and External thread
Art.no.ReferenceDNKvs** Kvs-value in m3/h at a pressure drop of 1 bar.ConnectionOpening temperatureA mmB mmC mmD mmWeight kgNTCNTC = National Trade Code
51002900VTC318203.2RN 1", G 1"45 ± 2°C704242460.49 
51003000VTC318203.2RN 1", G 1"55 ± 2°C704242460.49 
51003100VTC318203.2RN 1", G 1"60 ± 2°C704242460.49 
51003200VTC318203.2RN 1", G 1"70 ± 2°C704242460.49 
51003300VTC318203.2RN 1", G 1"80 ± 2°C704242460.49 

Installation support

Installation examples
VTC300_VTC500_Mixing-01
Mixing
VTC300_VTC500Diverting-01
Diverting
Installation instruction VTC300/VTC400

Technical data

Suitable application area
Recommended
  • Heating
  • Solar heating
Technical data
Pressure class PN10 
Media temperature, max.: +100 °C
min.: 0 °C
Max. differential pressure, Mixing: 100 kPa
Diverting: 30 kPa
Leakrate A - AB: Tight sealing 
Leakrate B - AB: max. 3% of Kvs 
Rangeability Kv/Kv min: 100 
Connections, Internal thread: EN 10226-1 
External thread: ISO 228/1 
Material, Valve housing and other metal parts with fluid contact: Brass DZR, CW 625N (resistant to dezincification) 
Conformity: PED 2014/68/EU, article 4.3 
Flow pattern Mixing_A-01
Diverting_A-01
Dimensioning $name
Dimensioning guide - Please see data sheet

Accessories and spare parts

Options
ImageArt.no.ReferenceDesignationNational trade codeNoteData sheetInstructions manual

VTC931

Thermostat VTC931, 45°C.
57000100VTC931Thermostat 45°C    

VTC931

Thermostat VTC931, 55°C.
57000200VTC931Thermostat 55°C    

VTC931

Thermostat VTC931, 60°C.
57000300VTC931Thermostat 60°C    

VTC931

Thermostat VTC931, 70°C.
57000400VTC931Thermostat 70°C    

VTC931

Thermostat VTC931, 80°C.
57000500VTC931Thermostat 80°C    
Spare parts
ImageArt.no.ReferenceDesignationNational trade codeNoteData sheetInstructions manual

VTC931

Thermostat VTC931 42°C
57000600VTC931Thermostat, 42°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 VTC300
Installation instruction VTC300
Spare Parts Solid fuel products
2D Image VTC310
2D Image VTC317

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