Flowserve Serck Audco Twin Isolation Plug Valve - Manual (Page 16)

7 MAINTENANCE (cont.)
7.4.2 ROTATING THE PLUG ON GEAR OPERATED TIPV VALVES
This is a complicated procedure and should not be undertaken lightly.
First fully open the valve using the gear.
Then unbolt and remove the gear from the valve, noting how it was positioned.
Operate the gear back through 90 degrees and then fit it back on the valve with the stem and
gear key-ways aligned.
Operate the valve 90 degrees using the gear and then remove the gear as before and
operate it back through 90 degrees.
Refit the gear, aligning the key-ways, and bolt on the gear. The plug and gear have now been
rotated through 180 degrees.
Retest the valve seats as appropriate.
7.5 GEAR OPERATOR MAINTENANCE
Gear operated TIPV valves are fitted with enclosed, water-tight, worm gear operators. Both single
and double reduction units are used. Gear operators are manufactured by quality suppliers such as
Mastergear.
All gears are lubricated with heavy bearing grease when assembled, and should not require
subsequent lubrication. Gear operators not grease filled for life, will be fitted with a grease nipple.
If the gear operator input shaft gets bent or broken, we recommend that the entire gear operator
be replaced as the internal bearings have probably also being damaged.
7.6 FASTENER TORQUE REQUIREMENTS
If any bolts/studs/nuts require tightening, the values must be obtained from SAV.
Serck Audco TIPV Twin Isolation Plug Valve FCD - SRENIM0005-04 (A4) – 02/14
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