Einbau- und Betriebsanleitung
Installation and Operating instructions
Instructions de montage et de service
5702-8010
9
08/2017
Check electric switching of safety temperature and pressure limiter as well as "Emergency OFF" (where applicable) in interaction
with the steam converting valve to check the safety relevant functioning of the steam converting valve (where applicable)
3.1.2
Steam converting valve with pneumatic actuator
Set compressed air supply at the filter pressure reducer to the given working pressure (see actuator instructions) and open
drainage screw shortly (blow-out of potential dirt in the supply air line)
Check electric switching of safety temperature and pressure limiter as well as "Emergency OFF" (where applicable) in interaction
with the steam converting valve to check the safety relevant functioning of the steam converting valve (where applicable)
Check electric switching of "Quick OPEN" in interaction with steam converting valve to check the function of the steam converting
valve (where applicable / turbine by pass station)
Initialise positioner (according to manufacturer instructions)
Check the direction of action of the actuator regarding the control variable (e.g. increase in pressure effects closing of valve) in
interaction with process controller / control technology
Check function of the actuator's electronic feedback (where applicable) in interaction with process controller / control technology
Check function and switch point of additional limit switch OFF to lock the injection valve (approx. 1.5mm before OFF position of
steam converting valve)
The cooling water injection valve is to be commissioned as described above.
The switch points of the safety limiters (STB and SDB) are to be adjusted according to the specification of the system designer
3.2
Warm commissioning
Set temperature controller to desired target value of steam temperature and switch on
Set pressure controller to desired target value of steam temperature
Drainage up and downstream ready and operational
Open pre-heater (where applicable) and pre-heat piping
Start up steam converting valve in very small steps using manual controls i.e. very slowly and bring both pipework and
steam converting valve carefully up to temperature and pressure. Check whether temperature controller works as of
set target temperature. Increase pressure until close to desired target pressure value.
Switch on pressure controller
Tighten spindle seals of cone spindle and injection nozzle pipe (pure graphite press assembly) as required.
All other spindle seals are maintenance-free thanks to a pre-loaded spring assembly.
Attention! Tightening the pure graphite assembly too much may cause high friction, which can impair the functioning
of the control valve.
Check dimensioning of steam converting valve
The control valve should work at about 70 to 100% of the stroke under normal operating conditions.
Maximum flow rate is not achieved: Check whether the valve is 100% open
Check that all manual shut off valves are open and the dirt traps are clean
Compare the dimensioning data with the actual operating data.
Valve is working with small stroke: The valve should be adjusted to the actual operating data to avoid premature wear
of the control fitting.
Coordinate measures with manufacturer.
Steam temperature is too high: Check whether cooling water pressure is available in designated amount and
pressure and that all manual shut off valves are open and the dirt traps are clean.
Check temperature measurement.
Coordinate measures with manufacturer.
Checking control system
The stability of the control system must be checked. The control valve should ideally remain in position when the target
value has been reached. Instable control systems (constantly moving back and forth one step) cause premature wear. In
this case please contact the manufacturer.
