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Disassembly
Recommended frequency:
Every 2 to 6 years (or less depending on operating conditions)
Verication
:
Condition of O-rings, diaphragms, lubrication
Replacement:
O-rings, diaphragm
Tools:
Dimensions according to tables below
Preliminary Operations (Figure 13)
Valve plug closed•
Inlet and outlet valves closed•
Bleed off outlet pressure•
Bleed off inlet pressure•
Unscrew the pilot impulse connection
•
Unscrew the screws (key 1) xing the bonnet (key 2)•
Remove plug• (key 19) (standard mounting only
without indicator)
!
WARNING
Caution is required when removing this plug
as the spring can expulse it
Remove the bonnet (key 2)
•
Remove the diaphragm/plug assembly (key 3)•
Remove the slotted cage (key 4), the O-ring (key 5), the •
strainer (key 6)
Clean parts and replace them if necessary
•
Pilot
Unscrew the manometric box screws•
Remove the diaphragm•
Slam Shut Version
Unscrew the BMS impulse line connector•
Remove the BM cover (key 7)•
Unscrew the BM xing screw (key 8)•
Remove the holding pin (key 10)•
Remove the BM (key 9)•
Unscrew the screws (key 11) from the connecting part •
(key 12)
Remove the connecting part (key 12)
•
Remove the spring (key 13) and the valve plug (key 14)•
Unscrew the bypass (key 15)•
Unscrew the CH• C screws (key 16) (DN 100 and 150)
Removing the seat (key 17) (not recommended) requires a
•
special extraction tool
BODY DN SCREWS (KEY 1 & 11)
SPANNER
(inches)
25 (1'') 9/16 - 12 x 1 3/4 13/16
50 (2'') 1/2 - 13 x 1 1/2 3/4
80 (3'') 5/8 - 11 x 1 3/4 15/16
100 (4'') 3/4 - 10 x 2 1/4 1 1/8
150 (6'') 1 - 8 x 2 3/4 1 1/2
B25A
B25B
Reassembly
Perform the above operations in reverse order (respect •
tightening torques)
Replace the O-rings and diaphragm at each disassembly
•
Slam Shut Reassembly
The valve plug should be held in an upper position using a •
packing gland and a box to facilitate reassembly
Precaution must be taken concerning the passage of the
•
valve plug over the segments
Lubricate screws before tightening
•
Lightly lubricate the O-rings (silicone grease) except for •
the valve plug O-ring
Lightly lubricate the stem (silicone grease)
•
Lubricate the release relay mechanism (yoke and bolt) •
(molybdenum graphite grease)
Lubricate the BMS spring (molybdenum graphite grease)
•
A special tool is required for reassembling a new seat•
Table 11. Spanner Sizes
Table 12. Torque Values
BODY DN
TORQUE N.m.
SCREW FIXATION CONNECTOR BYPASS
KEY 1 & 11 KEY 18 KEY 19 KEY 15
25 (1'') 110 8 130 14
50 (2'') 110 9 130 14
80 (3'') 175 28 280 20
100 (4'') 260 28 280 24
150 (6'') 510 70 410 24
(38 Seiten)
(1 Seiten)
(2 Seiten)
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