Series 541
OPERATION
291187ED
Edition 2015-07-09
13/25
5
Operation
WARNING
Unqualified personnel
Inappropriate handling may cause serious injury or property damage.
Only qualified personnel are allowed to carry out the described work.
5.1
Normal operation
Valve is closed and opened manually.
Closing: Turn hexagon head or inner square clockwise to its stop. For moving the plate only
a small closing torque is required. Then a second step with a steadily increasing torque
(sealing the valve) will follow until the stop is reached.
The sealing force of the valve can’t be increased with a higher torque. The
force to seal the valve is supplied by a spring, don’t overtorque.
Opening: Turn hexagon head counter clockwise to its stop. The valve is completely open
when the stop is reached.
If the mechanical stop in open position is reached, no additional torque
should be applied. To prevent any damage, the applied torque in fully open
position must not exceed 15 Nm.
For technical details, see product data sheet.
5.2
Operation under increased temperature
Maximum allowed temperature see product data sheet.
NOTICE
Inconstant temperatures
Performance of the valve may deteriorate.
– Actuate valve only after the bake-out temperature has been stable for two
hours.
– If valve must be actuated during bake-out, make sure that the heating or
cooling rate does not exceed 10 °C per hour in the temperature range
from 100 °C to 300 °C
– Make sure that the temperature differences over the whole body do not
exceed 60 °C.
