The Siemens VBF21 Three-port slipper valves, PN6, flanged N4241 Size: DN 150 is shown as number 6 in the 2nd image.

Siemens Three-port slipper valves, PN6, flanged VBF21 PN6 N4241 DN 125-150 kvs 550 - 820 
Three-port slipper valve PN6 with flange fittings to ISO 7005 
For use in closed-circuit heating systems and mixing applications

Angle of rotation 90 ° 
Medium temperature 1...120 °C 
Valve characteristic: lineair 
Permissable operating pressure: 600 kPa 
Material valve body: cast iron EN-GJL-250 (GG20/25) 
Material inside set: CrNi-staal/Rg6 
PN class 6 
Material housing: cast iron EN-GJL-250 inside: brass 
Leakage rate 0...0,5 % of kvs-value 

Related products: 

This product is supplied without gaskets, flanges and nuts and bolts.
One gasket is required per flange.

A mounting kit for the servomotor is not included.
If the mixing valve is used as a new installation with an actuator, a mounting kit ASK31N is required. This is available separately.
When replacing the mixing valve, it may be possible to use the old mounted set.

Matching actuators: SAL31/61/81 


Available types:

Type	DN	kvs
VBF21.125	125	550
VBF21.150	150	820