Emerson Fisher EZR series Instruction Manual page 11

Maintenance (continued)
Body
DN / In. keys 1 and 11
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
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)
B24
Figure 14. Type EZR-OS2
Table 13. Torque Specifications
Screw Spanner,
in.
13/16
3/4
15/16
1 1/8
1 1/2
Screw
Fixation
keys 1 and 11
keys 18
110
110
175
260
510
B25a
• 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 CHC (key 16) (DN 100 and 150)
Removing the orifice (key 17) (not recommended) requires a
special extraction tool
Type EZR
Torque N.m.
Connector
key 19
8 130
9 130
28 280
28 280
70 410
Bypass
key 15
14
14
20
24
24
B25b
11