The RFA 38/VBB is used in radiators, convectors and towel dryers.
NOTE! Do not use in HVAC systems
The valves can be regulated with a thermostatic head or a M28x1,5 handwheel.
The RFA 38 has a concealed pre-setting function in the stuffing box. Pre-setting of the 2-pipe system can be carried out using an FN2 key or the FV5 pre-setting tool.
The valve is connected to the pipe system using an M22x1.5 connection.
The valve tail has an R1/2” connection to the radiator.
The valve is supplied as a 2-pipe valve but is can be changed into a 1-pipe system. Remove the blue plastic plug from the bypass valve and unscrew the spindle using a 2.5 mm Allen key.The bypass valve is used to balance the flow between the radiator and the bypass.
The valve’s return is closed using a 2.5 mm Allen key and the inlet is closed using the thermostatic head or
the handwheel. The bypass is not closed.
Brass, O-ring EDPM, stainless steel
For 2-pipe system
Kv value Kvs value
Pre-setting FN 2
The valve is equipped with an insert which has concealed pre-setting functionality.
Unscrew the protective cap. Remove the stuffing box with the pin (use the tip of the FN2 pre-setting key).
Insert the pre-setting key with the serrated end in the control sleeve and carefully screw it to the bottom (clockwise).Screw up the number of turns outlined in the diagram.
Refit the stuffing box with the pin.
Remove the protective cap and the stuffing box as outlined above. Screw the control sleeve to the bottom as outlined above. Remove the pre-setting key and fit the pre-setting tool on top of the insert splines and reinsert the pre-setting key in to the tool. Reset the scale to the index mark. Screw up the control sleeve until the required kv value coincides with the index mark. Refit the stuffing box with the pin.
|RSK number||Article number||Designation||Description|
|480 61 37||4045803||RFA 38/VBB||Interchangeable 1-2 pipe system|
|480 63 16||9000266||RFA 38-160||RFA 38 including valve tail 160 mm|
|480 63 17||9000267||RFA 34-400||RFA 38 including valve tail 400 mm|
|480 60 26||9000116||NG 1527||Valve tail 27 mm*|
|480 60 27||9000117||NG 15160||Valve tail 160 mm*|
|480 63 68||9000320||NG 15400||Valve tail 400 mm*|
|480 60 28||9000118||NGV 15||Valve tail angle *|