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Types EZH and EZHSO
4. Connect the actuator to the downstream sense
line on a straight run of outlet pipe 8/10 (inside
diameter). Connect the other end of that impulse
to the Type PRX port.
5. Connect the PRX pilot port to the outlet pipeline at
a minimum distance of 4 x D from the regulator's
outlet flange.
6. For Type EZHSO installation, a vent valve downstream
of the regulator is needed. It should be installed
directly in the Type PRX pilot bleed line connection
(line from port "S" to pipe). A full bore NPS 1/4
ball valve for the vent line is preferred to provide
sufficient flow.
Wide-Open Monitor Regulator
1. Follow the procedures in the All Installations section
and then continue with step 2 of this section. The
sense and bleed control lines of both the upstream and
downstream pilots will be connected to the downstream
piping (see Figure 13).
2. Connect the pilot supply line for the downstream
regulator to the outlet "R" port of the Type SA/2 pilot
supply filter regulator.
Working Monitor Regulator
1. Follow the procedure in the All Installations section and
then continue with step 2 of this section. The sense line
of the upstream monitor pilot and the bleed and sense
lines of the downstream pilot will be connected to the
downstream piping (see Figure 14).
2. Connect an inlet supply line from the upstream piping
to the inlet "M" port of the downstream Type SA/2 pilot
supply filter regulator.
3. Connect a control (sense) line from the "A" port of the
upstream working Type PRX pilot to the intermediate
pressure portion of piping, using 8/10 (inside diameter)
tube.
4. Connect a downstream bleed line from the "S"
port of the upstream working Type PRX pilot to the
intermediate pressure portion of piping, using 8/10
(inside diameter) tube.
16
STARTUP AND ADJUSTMENT
Pre-startup Considerations
Each regulator is factory-set for the outlet pressure
specified on the order. If no setting was specified, outlet
pressure was factory-set at the mid-range of the pilot
control spring. Before beginning the start-up procedure
in this section make sure the following conditions are
in effect:
• Block valves isolate the regulator
• Vent vales are closed
• A bypass, if any, is in operation.
In all cases, check the control spring setting to make
sure it is correct for the application.
CAUTION
!
Be sure to slowly introduce pressure into the
system to prevent downstream overpressure
due to potential rapid pressure increase.
Pressure gauges should always be used
to monitor downstream pressure during
startup. Procedures used in putting this
regulator into operation must be planned
accordingly if the downstream system is
pressurized by another regulator or by a
manual bypass.
Type EZH OS2 Slam-shut Version
In the case of opening the mechanism box lid:
1. After arming, never leave the key on the stem.
2. Never put your fingers in or near the reset
mechanism area.
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