Check valves CLASAR®
Installation, operating and maintenance instructions
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3 Maintenance
3.1 Spare parts
Available spares are as follows:
• Shutter
• Return spring
• Ring seal between body and counterflange or rear shell
No special tool is needed for CLASAR valve maintenance.
3.2 Dismantling
Wafer-mounted CLASAR
• Remove valve from pipe and place on a clean plane surface with the upstream or body side
facing downwards and the downstream or counter flange side uppermost. The shutter and
spring should be visible. Uncouple the counter flange in the recesses provided at the junction
between the counter flange and the body, lever out and remove the counter flange.
• Remove spring and shutter.
CLASAR with flanges
• Remove valve from pipe and place on a clean plane surface with the body facing downwards
and the counter flange uppermost so that the shutter and spring are accessible. Loosen tie-
bolts securing the sleeve to the valve body and remove the rear shell followed by the spring and
shutter.
• When the dismantling is finished:
- Check condition of body mating surfaces, there should be no corrosion pitting or material torn
away. Make especially careful check in the shutter bearing region. Clean as necessary with
emery paper.
- Check condition of shutter supports in contact with the body. Check condition of ring
connecting fins. Change shutter if necessary.
- Check return spring.
- Change ring seal.
3.3 Reassembly
• Position shutter in body so that mating surfaces are in contact each other.
• Insert spring.
• Generously lubricate the ring seal and body bore.
• Pressing by hand, fit the counterflange to the valve body (type I and II CLASAR).
• Alternatively, bolt the rear shell into position (type Ill CLASAR with flanges).
2. Installation
2.1 Instructions before start up
• Before mounting, carefully check the valve for cleanliness. Remove all foreign bodies from the
pipework and flush the system through with water or compressed air as appropriate.
• Never weld flanges to the pipe when the CLASAR is in position because this might damage the
shutter.
• Provide a trashrack or other solids removal device if solids are liable to be borne along by the
flow and foul the shutter region and prevent closure.
• Check that the flow takes place in the direction shown by the arrow on the valve.
• CLASAR valve types I and II for Wafer-mounting must be perfectly aligned with the pipe centre-
line. Use spacer tubes mounted on tie-rods if necessary.
IMPORTANT
Particular care should be taken to remove
pieces of weld metal and shavings liable to
damage the shutter and sealing surfaces.
