IM-P405-46
EMM Issue 5
15
6.4.2 Disassembly
Once the precautions prior to the disassembly have been taken, follow the next steps:
-
Disassemble the end caps (
4
) of the actuator by untightening the external bolts (
20
).
Please note -
With
spring return actuators there is no inherent danger during this
operation, as the fastening bolts for the caps are designed with adequate length.
-
Unfasten the nuts (
24
) in order to remove the levelling screws (
23
).
-
Turn the pinion (
3
) anticlockwise to disengage the pistons (
2
) in normally closed actuators
and clockwise in normally open ones. Remove the pistons from the cylinder.
-
Disassemble the position indicator (
21, 22
and
27
), the slip washer (
13
), the soft pinion
washer (
15
) and the metallic pinion washer (
14
) from the upper side.
-
Disassemble the pinion (
3
) from the lower part of the body (
1
) of the actuator. To do this
operation, disassemble the upper pinion bearing (
10
) and the stop (
12
) through the inside
of the body.
-
Clean all the parts of the actuator.
-
Examine all parts in order to inspect for wear.
Important:
Carefully examine the inside
of the cylinder.
-
If everything is in good condition, fit the new 'O' rings, bushings, slide guides and washers
included in the Spirax Sarco BVA300 series maintenance kit before reassembling the
actuator - see Section 6.4.3.
-
Lubricate the parts of the actuator with Molykote B 2-2 plus grease. Apply a thin layer
of grease on the 'O' rings (
7, 8
and
16
).
6.4.3 Reassembly
After disassembly, and the inspection and lubrication of the relevant parts, proceed to
reassemble them following the sequence below:
-
Correctly assemble all the parts included in the Spirax Sarco BVA300 series
maintenance kit.
Note:
lubricate where stated in Section 6.4.2.
-
Place the pinion (
3
) in the body (
1
) from underneath. Once the pinion appears through
the inside of the body, assemble the pinion stop (
12
) in its correct position and also the
upper pinion bearing (
10
).
-
Place the soft pinion washer (
15
), the metallic pinion washer (
14
), the slip washer (
13
)
and the position indicator (
21, 22
and
27
) in the upper part of the pinion.
-
Assemble both pistons, checking that they engage at the same time when turning the
pinion (
3
) clockwise for normally closed actuators and anticlockwise for normally open
actuators.
-
Assemble the actuator end caps (
4
) tighten the bolts (
20
) in sequence. Check that the
open and closed positions coincide with the position indicated in the upper part of the
pinion (see Figure 6).
Important:
Once assembled, operate the actuator a few times and recommission - see
Section 4.
Summary of Contents for ABV21i
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