10
EZR
MAINTENANCE
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 1 fixing the bonnet 2
• Remove the bonnet 2
• Remove the diaphragm/plug assembly 3
• Remove the slotted cage 4, the O-ring 5, the strainer 6
(or the space washer 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 7
• Unscrew the BM fixing screw 8
• Remove the holding pin 10
• Remove the BM 9
• Unscrew the screws 11 from the connecting part 12
• Remove the connecting part 12
• Remove the spring 13 and the valve plug 14
• Unscrew the bypass 15
• Unscrew the screws CHC 16 (DN 100 and 150)
Removing the orifice 17 (not recommended) requires a special extraction tool
REASSEMBLY
• Perform the above operations in reverse order (respect tightening torques)
• Replace the O-rings and diaphragm at each disassembly
SLAM SHUT REASSEMBLY (Version with slam shut)
• 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 orifice
B24
Body DN
Screws
Spanner
Items 1 and 11
(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
Torque N.m.
Body DN Screw Fixation Connector Bypass
Item 1 & 11 Item 18 Item 19 Item 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
B25b
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