B24A
Type EZR
12
Europe, Middle East and
Africa Only
Table 13.
Troubleshooting for Type EZR Regulator
SYMPTOMS
CAUSE
ACTIONS
If outlet pressure is increases
Internal leak
Control the regulator valve plug
Control the regulator seat
Control the pilot
or contact after-sales
If inlet pressure decreases
External leak
Locate and repair leak
or contact after-sales
If inlet pressure is stable
The regulator is tightshut
Increase the set point until tripping occurs
(without exceeding the outlet limits)
If the slam shut valve plug will not close
Operation faulty
Control the release relay
Control the slam shut valve plug
or contact after-sales
If the slam shut valve plug closes
Operation correct
Observe the evolution of the outlet pressure (control tightness)
If the outlet pressure is stable
The valve plug is tightshut
Purge the outlet side of the regulator
Observe the evolution of the outlet pressure (control tightness)
If the outlet pressure increases
Internal leak
Control the slam shut valve plug
Control the slam shut seat
Control the bypass
or contact after-sales
If the outlet pressure is stable
Valve plug is tightshut
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)
• 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
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
