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
• 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 the bonnet
(key 2)
• Remove the diaphragm/plug assembly
(key 3)
Maintenance (continued)
• Remove the slotted cage
(key 4)
, the O-ring
(key 5)
, the
strainer
(key 6)
(or the space washer
(key 6)
)
• Clean parts and replace them if necessary
Pilot
• Unscrew the manometric box screws
• Remove the diaphragm
Slam Shut (Version with slam shut)
• Unscrew the BMS impulse line connector (IS)
• 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 screws CH
C
(key 16)
(DN 100 and 150)
Removing the orifice
(key 17)
(not recommended) requires a
special extraction tool
B24
Figure 14.
Type EZR-OS2
B25a
Body
DN / In.
Screw
keys 1 and 11
Spanner,
in.
Screw
keys 1 and 11
Torque N.m.
Fixation
keys 18
Connector
key 19
Bypass
key 15
25 / 1
9/16 - 12 x 1 3/4
13/16
110
8
130
14
50 / 2
1/2 - 13 x 1 1/2
3/4
110
9
130
14
80 / 3
5/8 - 11 x 1 3/4
15/16
175
28
280
20
100 / 4
3/4 - 10 x 2 1/4
1 1/8
260
28
280
24
150 / 6
1 - 8 x 2 3/4
1 1/2
510
70
410
24
B25b
Table 13.
Torque Specifications
Type EZR
11
Europe, Middle East and
Africa Only
