Einbau- und Betriebsanleitung
Installation and Operating instructions
Instructions de montage et de service
5702-8010
7
08/2017
1
General Information
Steam converting valves are used to regulate the steam pressure (reduction) and the temperature (steam cooling). Steam
cooling occurs similar to the steam atomizer principle. A cooling agent is injected from below into the valve seat over a nozzle
pipe. The cooling agent is optimally and finely dispersed. The cooling medium has usually evaporated within 0.1-0.2 seconds.
The selection of the steam-converting valve depends on the working conditions and the intended standard task. They differ in
connecting dimensions, nominal pressure level, as well as housing and seal material and the flange design.
Attention!
Steam converting valves should only be used for the designated working conditions.
The housing material and nominal pressure level are stated on the housing of the control valve. These data must be suited to the
maximum permissible working conditions (pressure and temperature).
Every valve has a unique serial number, which is written on the identification plate of the valve as "W. Nr.". When ordering spare
parts, always state the serial number of the valve. See Appendix Figure 1.
The steam converting valves are subjected to several tests (pressure testing, leakage testing,...) including performance checks in
the manufacturing plant. That means that the valve does not need to be adjusted.
Attention! Before installing or commissioning valves, please read the pamphlet 0000-7004 "Hazard warning...“
Only trained and qualified specialist staff may install and commission valves.
2
Installation and connection
2.1
Installation steam converting valve
Observe the following when installing the steam-converting valve
:
Clearance
The installation position should be easily accessible. There must be adequate space for maintenance work to be performed
and to open the actuator hood. Steam converting valves installed outdoors should have suitable weather protection such as
a sun and rain hood. The cooling water connection and feed piping must be protected suitably against possible freezing.
Before installing:
Remove protective caps from the flange openings.
Cleaning the piping:
To ensure a tight connection of the steam converting valve, the piping must be rinsed / blown through thoroughly before installing the
valve. This prevents dirt particles such as rust, scale or welding beads from damaging the seat or the cone of the steam-converting
valve. Appropriate measures must be taken in order to ensure that clean steam is fed into the system and protect the system from
soiling during normal working conditions.
Direction of inflow:
The flow direction must correspond to the arrow on the valve housing.
Installation position:
The valve should be preferably installed in horizontal piping with upright actuator.
Tension on valve body:
Precautions must be taken to prevent any tensile and pressure forces on the valve.
Pipework routing:
For smooth operation of the steam-converting valve, the feed-in distance to the valve should be > 5x DN, straight, unbranched and not
interrupted. Downstream from valve, the evaporation / discharge distance should be > 10x DN straight, unbranched and not
interrupted.
The silencer that is usually installed downstream from the valve for over-critical decompression is part of the evaporation zone.
Appropriate drainage of the piping both up and downstream from the steam-converting valve must be ensured. We recommend
keeping the valve and the piping warm with appropriate means both up and downstream from the valve when the steam-converting
valve is being used as a turbine bypass station and to avoid unnecessary temperature stress.
