Document
Document id
Issue Date
Maintenance instruction
mi-WB14E-HW-SC-EN 1
2021-04-14
8 (10)
6.
Changing from hand wheel to SC double-acting pneumatic cylinder when the
valve is installed between flanges
6.1
Safety warnings
•
This instruction includes safety instructions for foreseeable risks during assembly of the
cylinder onto a Stafsjö WB14E knife gate valve. It is the users responsibility to minimize
or eliminate the potential for harm or injury that could be present in the overall
system, or surrounding environment.
•
Valve and actuator installation and service instructions also has to be respected and
followed.
•
Any assembly and disassembly work must be completed by qualified personnel only.
Qualified personnel are persons who, on the basis of their training, specialist
knowledge and professional experience, can correctly assess and execute the work
assigned to them and can identify and avoid potential risks.
•
The same requirements for the compressed air supply system and the local plant
control system are to be complied with for the cylinder. These requirements must be
additionally complied with when connecting the cylinder.
•
No exterior loads must be applied to the cylinder. If it needs to be supported, section
3.4 need to be observed.
•
The cylinder and accessories must be protected from such ambient influences that can
pose a functional risk.
•
Make sure that access to the installation site, as well as the installation site itself, is
easily accessible and provides sufficient space, lightning, visibility for installation.
•
After assembling the actuator should be freely accessible.
•
If a fault or problem is detected, the knife gate valve must be disconnected and
maintained.
•
After installation, the function of the valve and actuator must be in accordance with
the valve and the actuator destinations. See installation and service instructions for
further information.
Danger
No work is allowed on the knife gate valve when the system is pressurized. The system must be
free from pressure and empty.
Work on the knife gate valve when the system is under pressure can cause serious harm to
persons and damages to equipment.
Danger
•
During installation, the actuator must be secured against falling at all times and
disconnected from the air supply.
•
To do this make sure that exclusively validated and approved hoists are used. The assembly
may only be completed by qualified personnel. Avoid a physical overload.
6.2
Conditions for the combination of valve and pneumatic cylinder
•
The cylinder Ø and the stroke must be in accordance with the valve type and its size.
•
The cylinder has an adapter (38) assembled and match the interface of the valve.
•
The valve has beams (7) with holes for limit switches in opened/closed position and lockout if needed.
•
The clevis pin (20) and the split pins (21) match.
•
The clevis pin (20) match the hole in the gate.
•
The two gate guards cover the stroke of the gate (16).
•
The quality of the compressed air corresponds to the specifications in the actuator installation and
service instruction and the compressed air connections comply with the specifications.
•
Ensure the feed line for the compressed air is adequately dimensioned.
