User Manual

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Siemens 2-port seat valves PN25 with flanged connection CM1N4373en
Building Technologies 15.11.2010
When mounting, pay attention to the valve's flow direction symbol .
VVF52..  Standard
Direction of action: closes against pressure
VVF52..G  Steam
Direction of action: closes on pressure
Commission the valve only if the actuator has been mounted correctly.
Valve stem retracts: valve opens = increasing flow
Valve stem extends: valve closes = decreasing flow
Maintenance
VVF52.. valves require no maintenance.
When doing service work on the valve / actuator:
 Deactivate the pump and turn off the power supply
 Close the shutoff valves
 Fully reduce the pressure in the piping system and allow pipes to completely cool
down
If necessary, disconnect the electrical wires.
Before putting the valve into operation again, make certain the actuator is correctly
fitted.
The glands can be exchanged without removing the valve, provided the pipes are
depressurized and cooled off and the stem surface is unharmed.
If the stem is damaged in the gland range, replace the entire stem-plug-unit.
Contact your local office or branch.
Disposal
Before disposal the valve must be dismantled and separated into its various constituent
materials.
Legislation may demand special handling of certain components, or it may be sensible
from an ecological point of view.
Current local legislation must be observed.
Warranty
The technical data given for these applications is valid only in conjunction with the
Siemens actuators as detailed under "Equipment combinations", page 3.
All terms of th
e warranty will be invalidated by the use of actuators from other
manufacturers.
Direction of flow
Commissioning
Warning
Stem sealing gland