Page 5 - Energy_en

REGULATING STEAM FLAPS

Steam flaps and butterfly valves are generally used in thermal power stations. So far,
these were mostly coal, oil or nuclear power stations, although recently renewable energy
sources are being increasingly important for steam production. The butterfly valves used
serve as safety valves for the controlled release of overpressures in the system and are
continuously electronically monitored by the existing safety systems.

FUNCTION
In safety valves, butterfly valves have the safety function of
guaranteeing that no inadmissible pressures prevail in the
main system. Wandfluh valves and electronic control cards
ensure that the butterfly valve operates in conformity with
safety standards. For varying opening and closing times, a
wide product range of proportional spool valves and elec-
tronic control cards is available.

PC
Parameterisation analogue x
s
Controller
Feedback
Amplifier
PLC
Analogue or Solenoid A
fieldbus Solenoid B
interface

CONTROL
Butterfly valves are actuated in a closed control loop with
proportional spool valves that have an optimised flow ca-
pacity. As a result of the safety requirement, the valves are
controlled by means of control electronics that ensure the
tight pressure, the boosting of emergency closing and the
failure function.

SPECIALITIES
• Proportional valves with optimised flow capacity
• Control electronics with adapted software
• Valves available in various executions, including stainless steel

WANDFLUH ENERGY | APPLICATION | REGULATING STEAM FLAPS | PAGE 3