TECHNICAL MANUAL MT103
47
PRELIMINARY OPERATIONS
A.
Put the regulator into conditions of safety;
B.
Ensure that the upstream and downstream pressures are 0.
INITIAL OPERATIONS
1)
Disconnect all the feed and sensing line connectors from the pilot and regulator by unscrewing the
taper seal fittings.
2)
Slacken the fixing nut of the bracket supporting the pilot on the regulator.
3)
Remove the 204/A/FO + R14/A/FO pilot assembly from the regulator.
DISASSEMBLY
(The positions refer to fig. 26)
4)
Slacken the fixing screws, pos. .
5)
Remove the top cover, pos. , using appropriate means and turning the eyebolt, pos. .
6)
Slacken the fixing screws, pos. .
7)
Separate the top cover, pos. , from the top flange, pos. .
8)
Remove the stroke indicator rod guide, pos. , from the top flange, pos. .
9)
Keeping the diaphragm-holder assembly fixed with a wrench, unscrew and remove the balancing rod guide,
pos. .
10) Separate the balancing piston, pos. , from the balancing guide rod, pos. .
11) Remove the diaphragm holder assembly.
12) Slacken the diaphragm-holder assembly fixing screws, pos. .
13) Separate the protection discs, pos. , from the diaphragm, pos. .
14) Slacken the fixing screws, pos. .
15) Separate the bottom cover, pos. , from the obturator guide, pos. .
16) Remove the guide rod, pos. .
17) Control and clean all the disassembled metal parts.
18) Replace all the parts from the spare parts kit.
REASSEMBLING THE REGULATOR SERVOMOTOR UNIT
Remember that the O-rings and the sliding mech-anical parts (rods, etc.) must be lightly lubricated, befo-
re reassembly, with a fine layer of silicone grease, while static parts require grease to make them softer but
mainly to hold them in their slots:
Procedure for disassembing, completely changing the spare parts, and reassembling of
REFLUX 819/FO pressure regulator with 204/A/FO + R14/A/FO pilot (PREVENTATIVE
PROGRAMMED MAINTENANCE)
25
3
32
27
3
14
17
14
11
15
11
29
12
50
27
3
2
20
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