22
5.2 PN9000E spring-extend
5.2.1 Diaphragm kit - How to fit:
Note: Items 9 and 28 do not apply to the PN9400 actuator.
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Remove the actuator from the valve as described in Section 5.1.
Note 1: There are 3 off longer housing screws (23) which are fitted to safely allow spring
decompression. These should be removed last after all other screws are removed and
should be loosened evenly to prevent distortion of the housing. Refer to Section 5.4 if
a handwheel is fitted.
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Lubricate the threads of the three long hex. head screws with a PTFE based grease
before releasing the tension in the springs.
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Loosen and remove the short housing screws and nuts (22, 23 and 24).
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Holding each nut with a spanner, rotate the three long hex. head screws a few turns at
a time. Remove the screws and upper housing (2).
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Remove the springs (5). Using a spanner to hold the actuator spindle (6), loosen the
bolt (21). Remove spacer (8), 'O' ring (9), washer (28), diaphragm plate (3) and finally
the diaphragm (4).
-
Refit the new diaphragm (4) and reassemble all items in reverse order, taking care not
to damage the 'O' ring. It is recommended that Loctite 243 be applied to the upper
thread of the spindle (6) prior to tightening. Using two spanners, whilst holding the
actuator spindle (6) tighten the bolt (21). Refer to Table 1, for the recommended tightening
torques.
-
Refit the top housing (2) and securing the nuts and screws (22, 23 and 24). Refer to
Section 5.4 if a handwheel is fitted.
Note 2: Supporting the actuator spindle (6) ensures that the diaphragm sits evenly in
the lower housing. Tighten the housing screws evenly to avoid distortion. 3 off longer
housing screws (23) are provided on some spring ranges to cater for longer springs. If
supplied, these should be positioned 120° apart and tightened evenly prior to fitting the
remaining screws.
To avoid distortion of the diaphragm do not fully tighten housing screws until all
screws have been fitted. Final tightening should then be carried out.
Table 1 Recommended tightening torques
Actuator series
Screws and nuts
(Items 22, 23 and 24)
Bolt
(Item 21)
Size Torque Size Torque
N m lbf ft N m lbf ft
PN9100 M6 7 5.2 M12 40 29.5
PN9200 M10 35 26.0 M12 40 29.5
PN9300 M10 35 26.0 M12 40 29.5
PN9400 M10 60 44.0 M16 40 29.5
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