Operating Instructions Quadax Series Butterfly Valves with Actuator
Version January 2011
Page 4/11
Caution
It must be ensured that the selected materials for the parts of the valve that come into
contact with media must be suitable for the media used. The manufacturer assumes
no liability for damages that have been caused by corrosion or aggressive media.
Non-observance of these instructions can endanger life and limb and may
cause damage to the pipe system.
An actuating unit which was subsequently mounted on the valve, which was adjusted
to the valve and in both end positions correctly adjusted. In the closed position, the
end stop must be in the seat of the valve. A stroke limitation in the actuating unit for
the closed position should either be reset or made ineffective.
The pipe system and the control system were professionally mounted. The wall
thickness of the valve body is dimensioned so that in such professionally routed
pipelines an axial pipe force Fzas per Barlow's formula (Fz= π/4٠DN²٠PS) is
considered. With butterfly valves for clamping even higher values for Fzcan be
permitted. Any shear forces applies to the valve may not exceed 10% of the
aforementioned forces.
(PS = maximum permissible rated pressure at room temperature),
The valve is professionally connected to these systems, especially such valves which
are connected to the pipeline by welding,
The operating time of a pneumatic/hydraulic actuator is adjusted to the system
parameters,
In this pipe system the usual flow rates (e.g. 4 m/s for liquids) in continuous operation
are not exceeded and abnormal operating conditions such as vibrations, water
hammers, temperature shocks, cavitations, wet steam with a high water content and
more than insignificant portions of solids in the medium - particularly abrasive ones -
are cleared with the manufacturer,
Valves which are operated at operating temperatures of >50°C or <-20°C are
protected against contact together with the pipe connections,
The valves are only operated and maintained by specialized and trained personnel.
2.3 Particular hazards
Danger -
Life
threatening
The valve shaft is sealed by a stuffing box. Before the nuts on the stuffing box gland
are loosened or unscrewed, the pressure in the pipeline has to be completely
reduced and the pipe system empty, so that no medium escapes from the stuffing
box.
Danger -
Life
threatening
Before loosening the plug (or the cover) on the body or before removing the valve
from the pipeline the pressure in the pipeline has to be completely reduced so
that no medium can escape from the line uncontrollably. It must be ensured that the
valve is opened 5°-10, so that any pressure can escape from both sides of the
valve. The actuator may – if required – be disassembled only once the valve has
been opened for for this purpose and that it remains in this opened position.
Caution
For valves used as terminal valves:
With normal operation, especially with gaseous, hot and/or hazardous media a
dummy flange or a sealing cover has to be mounted on the free connecting
socket or (only for short-term use!) the valve has to be securely locked in “CLOSED”
position.
Caution when closing such as valve: Danger of crushing!
Caution
If a valve has to be opened in a pressurized line as a terminal valve, this must be
accomplished with utmost caution so that spurting medium does not cause any
damage.
Caution when closing such as valve: Danger of crushing!
