AMOT 10GEF, Руководство по эксплуатации и обслуживанию, Страница: 19 / 80

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Valve Body
OMMG00012 Rev 12 – NOV 2019
11 Remove and discard the upper and lower shaft O rings (9 & 11).
12 Inspect the valve internals for wear, damage and cleanliness. Clean and
replace if necessary.
Note
It is recommended that the upper and lower composite bearings (6 & 10)
are replaced at this stage.
Reassemble Valve (refer to Fig 4, page 18)
1 Fit new upper and lower shaft O rings (9 & 11) to the rotor shaft.
2 Carefully insert the rotor assembly into the valve body with the rotor in
the low temperature position.
3 Fit a new cover O ring (8) to the cover and position the cover on the
valve, aligning the marks made during disassembly.
4 Fit the cover bolts (1) and washers and tighten to a torque of 244 Nm (4”
& 6” valves) or 476 Nm (8” valve).
5 Fit the retaining plate (5) and new O ring (3).
6 Install the actuator onto the valve body in accordance with Sect 4.8.1
(page 36).
3.4.3 Dismantle and Assemble 10 and 12 inch Valves
Dismantle Valve (refer to Fig 5, page 20)
If the valve is installed in the upright position, it is possible to dismantle the
valve whilst still installed in the pipework as follows:
WARNING
The valve may contain hot/pressurised fluid. Ensure the valve is
isolated, drained and allowed to cool to a safe working level before
dismantling.
1 Switch off and isolate power to the actuator.
2 Using the handwheel, turn the valve to the low temperature position.
3 Mark adjacent points on the actuator and coupling and also on the
coupling and cover (6) to aid reassembly.
WARNING
If an actuator is removed from a valve fitted in a live system, the valve
rotor may rotate uncontrollably in the body. An actuator must never
be removed from a valve installed in a live system.
4 Remove the actuator from the valve body in accordance with Sect 4.8.1
(page 36).
5 Remove the bolts (2) and retaining plate (5).
6 Remove and discard the O ring (3).
7 Mark adjacent points on the valve body and cover to aid reassembly.
8 Remove the bolts (1) and washers securing the valve cover.
Note
There are two jacking holes in the valve cover to aid removal.