Emerson Fisher EZR series - Page 11

Disassembly
Recommended frequency:
Every 2 to 6 years (or less depending on operating conditions)
Verication:
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) xing 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 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 screws CHC (key 16) (DN 100 and 150)
Removing the orice (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 Specications
Type EZR
11
Europe, Middle East and Africa Only