Adjustment; Shutdown; Maintenance - Emerson Fisher CT88 Instruction Manual

1. Open the system shutoff valve.
2. Slowly open the outlet block valve.
3. Open the inlet block valve slightly and keep in this
position until pressure is maintained at the desired
setpoint and stabilized.
4. Slowly unscrew the bleed plug to exhaust air that
might have been trapped in the actuator. Screw
and tighten the plug. Exercise caution at all times.
5. If resetting setpoint, then set the regulator
to the desired set pressure according to the
Adjustment procedure.

Adjustment

!
Personal injury, equipment damage or
leakage due to escaping fluid may result
if adjusting screw and jam nut are not
installed properly.
Always use a pressure gauge to monitor pressure
when making adjustments.
The backpressure regulator spring can be backed
off to 0 psig / 0 bar. Recommended maximum inlet
pressures and temperatures are shown in Table 1.
1. Loosen the jam nut.
2. To increase the setting, turn the adjusting
screw clockwise. Turn the adjusting screw
counterclockwise to decrease the setting.
3. Tighten the jam nut to maintain the desired setting.

Shutdown

!
Escaping process fluid from an open
bleed plug may result in backpressure
regulator damage, personal injury and
property damage. To avoid such injury
and property damage, make certain
the bleed plug is properly closed after
bleeding process fluid.
WARNING
WARNING
Figure 3. Diaphragm Case
1. Close the inlet block valve (see Figure 2).
2. Close the outlet block valve.
3. Turn the adjusting screw counterclockwise until all
spring force from the backpressure regulator has
been removed.
4. Slowly open the outlet block valve to release
upstream pressure.
5. Slowly open bleed plug and make sure all pressure
has been relieved from the control line.

Maintenance

!
Personal injury, equipment damage
or leakage due to escaping fluid may
result if seals are not properly lubricated
or maintained. Due to normal part
wear or damage that may occur from
external sources, this backpressure
regulator should be inspected and
maintained periodically. The frequency
of inspection, maintenance and
replacement of parts depends upon
the severity of service conditions or
the requirements of local, state and
federal regulations.
Backpressure regulators that have been
disassembled for repair must be tested
for proper operation before being returned
to service. Only parts manufactured by
Emerson should be used for repairing
Fisher™ backpressure regulators. Restart
liquid utilization equipment according to
normal startup procedures.
Type CT88
BLEED PLUG
WARNING
5