Document
Document id
Issue Date
Maintenance instruction
mi-WB14E-HW-SC-EN 1
2021-04-14
9 (10)
As standard Stafsjö supply SC double-acting cylinder conversion kits customized for each valve
type and size. To ensure correct conversion kits are supplied, the purchaser must supply all
required information with the order, i.e. article and serial number of the valve. Using any other
parts than original Stafsjö parts may cause malfunction and is the responsibility of the user.
Danger
For reasons of safety, a valve with pneumatic actuator may only be operated once all gate
guards have been properly assembled on the valve. If this is not observed, life and health of the
personnel are at risk. These gate guards partly prevent the visual check of the valve’s gate
position. If required, two electronic limit switches can be installed onto the valve for indicating
of opened and closed position or a gate indicator pin.
The connection of any additional electric/electro-pneumatic modules supplied with the actuator is described
in the accompanying documentation and must be observed. These documents apply in addition to these
instructions. Installation of accessories not intended for this purpose is not permitted.
6.3 Compressed air connections
The compressed air connections of the pneumatic cylinder have an interface according to <Namur VDI/VDE
3845> and threaded holes according to ISO 228-1:
Cylinder size
Connection
Compressed air supply *)
SC100-SC160
G ¼”
Min. 8 mm
SC200-SC320
G ½”
Min. 15 mm
*) This inner dimension must be larger in case of long air feed lines
Suitable seals are to be used for the screw connections in the cylinder. The pipework for the compressed air
supply to the cylinder should be at least the same size as the air connections. If the feed line is undersized,
this can result in a malfunction.
6.3
Converting an installed hand wheel operated WB14E to SC double-acting
pneumatically operated
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.
Assemble in the following steps:
1
Make sure that the valve is closed.
2
Dissemble the hand wheel kit (1, 2a, 58a, 2, 2b, 2c, 3, 4, 4a, 4b).
3
If the valve has beams (7) with limit switch and lockout holes, continue
to step 5. If the valve does not have it, these must be replaced with new
beams with holes.
4
Lift of the beams (7) and replace with new beams with lockout and limit
switch holes. The holes on the beam are placed on different distances
from the short side of the beam. The side of the beam with the longest distance between the hole
and the short side shall be placed against the top of the valve body.
5
Ensure the tie rods (5) are properly tightened into the valve body. Re-tighten if necessary.
Limit swith holes
Lockout holes
Lockout holes
Limit swith holes
