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Operating Instructions for ROCO Butterfly Valve
____________________________________________________________________
BA50E103
Issue 02/06
REV 2
ERHARD-Armaturen
x
D-89502 Heidenheim
x
Postfach 1280
Phone +49 (0)7321 320-0
+49 (0)7321 320-525
e-mail: info
@
erhard.de Internet: http://www.erhard.de
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5.2 Inadmissible Operation
Installation behind elbows or similar disturbing installation parts is to be prevented.
Long-time operation in throttled position leads to higher wear. When the valve is used as
throttling valve, it has to be checked whether the valve is suitable for the operating
conditions.
Do not exceed limiting values of the flow medium temperature.
Do not exceed limiting values of the working pressure.
Closed valve may only be charged up to the nominal pressure.
For EPDM profile sealing rings and sealings: rubber parts must not get in contact with oil
or grease (EPDM swells!).
6 Maintenance
6.1 Maintenance and Inspection
ROCO
Butterfly Valves are equipped with maintenance-free plain bearings. Gearbox stem
and gearbox bearing are of the long-time lubricating type. Control of the performance and
tightness is to be done regularly in intervals of <= 4 years according to DVGW print
W390.
Before carrying out work on the valve, the repair valve must be
closed and the pipe section must be made pressureless.
Check external condition of the valve including operating gear.
If necessary clean the valve and repair the coating.
Check tightness at the flanges.
Check well-running of valve and operating gear.
Move valve manually over total travel.
Check seat tightness: close the valve.
Check pressure drop upstream and downstream of the valve.
6.2 Readjustment and Repair
6.2.1 Readjustment of the Profile Ring, fig. 2.
ROCO
Butterfly Valves are equipped with a readjustable sealing system. The profile
ring (4) can be readjusted in closed position of the valve disc. For this purpose, loosen
the threaded pins (6) and tighten evenly the countersunk screws (5) in a crosswise
manner. As the profile sealing ring acts very fast when tightening, we recommend to
proceed by taking small steps (half turn of the screws). Afterwards tighten threaded
pins (6) by turning them in clockwise direction and thus locking the profile sealing ring.