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Type EZR
disassembly
Recommended frequency:
Every 2 to 6 years (or less depending on operating conditions)
Verification:
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) fixing 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 fixing 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 CHC screws (key 16) (DN 100 and 150)
• Removing the seat (key 17) (not recommended) requires a
special extraction tool
14
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
BOdy dn
ScREWS (kEy 1 and 11)
dn
In.
25
1
9/16 - 12 x 1 3/4
50
2
1/2 - 13 x 1 1/2
80
3
5/8 - 11 x 1 3/4
100
4
3/4 - 10 x 2 1/4
150
6
1 - 8 x 2 3/4
Table 12. Torque Values
BOdy dn
Screw
Fixation
dn
In.
key 1 and 11
key 18
25
1
110
50
2
110
80
3
175
100
4
260
150
6
510
SPannER,
In.
13/16
3/4
15/16
1-1/8
1-1/2
TORquE, N•m
connector
Bypass
key 19
key 15
8
130
14
9
130
14
28
280
20
28
280
24
70
410
24
B25A
B25B
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