11
NAF Duball DL Ball Valves NFENIM4163-00-A4 05/17
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Figure 9.Stem packing
13 Assemble and, if possible, pressure test, the valve as described
in Section 10.3. However, first assess whether the seat rings (4)
and pocket ball (3) should be replaced.
11 Fitting an actuator to the Pocket
Valve
1
Fit the actuator to the valve. Ensure that the valve is in the filling
position and that the actuator is in the
closed
position before
fitting the actuator. Standing the main body (1) on a flat surface,
the valve is in the filling position when the keys (20) in the stem
(5) are perpendicular to the valve flow path and the ball opening
is facing upwards in the direction of the body cover (2).
2
Check the operation and check that the end stops have been
correctly preset or adjust them so the ball is in the correct
position.
Note:
The direction of discharge must always be counterclock-
wise (CCW) as viewed from the actuator. Accordingly, returning
to the filling position should always be in the clockwise (CW)
direction.
5
20
6
16
7
8
9
10
11
12
13
