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IM-P405-46
EMM Issue 5
16
Valve
Note: Before actioning any maintenance programme observe the 'Safety information'
in Section 1.
6.5 Maintenance
As with all mechanical devices, regular maintenance is the most efficient means of ensuring
continued operational efficiency. Regular scheduled inspection of all valves is essential
especially on valves which are operated only occasionally.
6.6 General maintenance
Remove the complete flanged valve from
the pipeline. The complete body assembly
can then be removed and new parts fitted.
Please note:
A special tool, that is only
available from Spirax Sarco, is required
in order to remove the insert (
2
) - See
Section 7, Available spares. When the
seats have been replaced and the valve has
been reassembled it is recommended that
the following tests are conducted before
commissioning back into service:
-
Cold hydraulic test to the ABV21i body at
60 bar g (870 psi g), and the ABV40i body
at 76.5 bar g (1 109 psi g).
-
Seat leakage test using compressed air
at 7 bar g.
6.7 How to replace the seats (5)
-
Remove the body as described in
Section 6.2.
-
With the body removed, remove the
seats (
5
) and 'O' ring (
6
).
-
Fit new seats (
5
) pushing them into the
body chamber.
-
Insert a new 'O' ring (
6
) replace the
ball valve insert (
2
) and tighten to the
recommended torque - See Table 1.
6.8 How to replace the stem
seals (9
and
10)
-
Remove the body as described in
Section 6.2.
-
Remove the nut (
15
).
-
Replace the stem seals (
9
and
10
).
-
Insert a new 'O' ring (
6
) replace the
ball valve insert (
2
) and tighten to the
recommended torque - See Table 1.
6.9 Reassembly
Reassemble in reverse order to instructions
given above. The stem nut (
15
) and the ball
valve insert (
2
) should be tightened to the
recommended torques shown in Table 1.
6.10 Testing
-
Ensure that the stem can rotate freely,
without undue friction.
-
Carry out seat leakage and body
hydraulic testing as appropriate:
-
Seat leakage test at
6 bar g (87 psi g) (air under water)
-
Cold hydraulic test at
78 bar g (1 131 psi g) (Class 300)
6.11 Assembly
-
Refit actuator/bracket assembly ensuring
that the valve is fully closed before
attempting to locate the drive adapter.
-
Connect an air supply and check that
the valve opens and closes correctly
and fully.
Содержание ABV21i
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