1 D 71 en 13
7 MALFUNCTIONS
Operational malfunctions are listed in Table 3.
8TOOLS
In addition to standard tools, you need an extractor for
removing the actuator, which can be ordered from the
manufacturer. The actuator size and type should be
given when ordering the tool.
9 ORDERING SPARE PARTS
When ordering spare parts, always include the follow-
ing information:
❑ type code, sales order number, serial number
(stamped on a valve body)
❑ number of the parts list, part number, name of
the part and quantity required
This information can be found from the identification
plate or documents.
Table 3 Malfunctions
Symptom Possible reason Action
Leakage through a closed valve Wrong stop screw adjustment of the
actuator
Adjust the stop screw for closed position
Damaged ball tightening surface Turn the ball by 180 degrees
Damaged seat(s) Replace seat(s)
Ball cannot move freely Clean the valve from inside
Irregular valve movement Dirt between the ball and the seats Flush the valve from the inside
Clean the tightening surfaces and seats
mechanically
Leakage through gland packing Loose gland packing Tighten the nuts
Worn-out or damaged gland packing Replace the gland packing
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