CaUTiOn
To prevent damage to the pilot during
startup, the sense and bleed lines
should be located on the same side of
the downstream block valve.
8. The PRX Series pilot connections are 1/4 NPT.
Connect a downstream bleed line from the “S” port
on the PRX Series pilot to a straight run of pipe 6
to 10 pipe diameters from the regulator outlet as
shown in Figure 3, using 3/8 in. / 9.5 mm or larger
outside diameter tubing.
9. Install hand valves in the downstream sense and
bleed lines if desired. If hand valves are installed,
they should be full flow valves, such as a full port
ball valve.
10. For optional remote pneumatic loading of a
PRX Series pilot, make the spring case piping
connections just as they would be made for
remote venting.
11. If extra support is needed for the Type FL regulator
due to its weight, then support the regulator using
a Y-style support underneath the inlet body cover
(key 11) and the outlet body cover (key 13).
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 3).
2.
Connect the pilot supply line for the downstream
regulator to the outlet “R” port of the Type SA/2
pilot supply filter regulator (both upstream and
downstream pilots are connected to a single
Type SA/2).
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 3).
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 PRX Series pilot to the
intermediate pressure portion of piping, using
3/8 in. / 9.5 mm or larger outside diameter tubing.
4. Connect a downstream bleed line from the “S” port
of the upstream working PRX Series pilot to the
intermediate pressure portion of piping, using
3/8 in. / 9.5 mm or larger outside diameter tubing.
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 startup
procedure in this section, make sure the following
conditions are in effect:
• Block valves isolate the regulator
•
Vent valves 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.
note
When using a Type Sa/2 pilot supply
filter regulator, the differential pressure
across the regulator must be at least
45 psid / 3.1 bar d for optimum regulator
performance. The Type Sa/2 can be
removed if differential pressure across the
regulator is less than 45 psid / 3.1 bar d
and inlet pressure stays at or below
200 psig / 13.8 bar.
9
Type FL
North America
Only
