Data Sheet for Product

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Siemens 2-port and 3-port Terminal Unit Valves PN16 CA1N4847en
Smart Infrastructure 2021-07-16
Mechanical design
• Combined disc / plug flow restrictor
• Seat ring embedded in through-port A  AB
• Seat machined into bypass B  AB.
• Continuously lubricated sealing rings
• Conical return springs, for more compact valve construction
Engineering notes
Also refer to "Mounting notes" and "Commissioning", page 7.
The 2-port valves should preferably be installed in the return, where the stem seal will
be exposed to lower temperatures.
A strainer should be fitted upstream of the valve. This increases reliability.
Valve construction
Valve series
Valve flow in control mode
Valve stem
Inlet A
Inlet B
Outlet AB
Retracted
Extended
2-port valves
A AB
4847Z01
VVP47..(S)
A
AB
variable
variable
A
AB
opens
A
AB
closes
3-port valves
A
AB
B
4847Z02
VXP47..
A
AB
B
variable variable constant
A
AB
opens
B
AB
closes
A
AB
closes
B
AB
opens
3-port valves with bypass
A AB
B
4847Z03
VMP47.. (S)
A
AB
B
variable variable constant
A
AB
opens
B
AB
closes
A
AB
closes
B
AB
opens
The direction of flow MUST be as indicated by the arrow, i.e. only from
A
→ AB and B → AB.
The 3-port valve types VXP47.. and VMP47..(S) may only be used in mixing
applications.
Recommendation:
Warning