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Type 92C
Since a clogged vent may cause
improper regulator functioning, install
and maintain the Type 92C regulator so
that the Type 6392 pilot spring case vent
remains clear and unobstructed.
To install a pilot-operated regulator:
1. Connect a downstream control line of at least
1/4 in. / 6.4 mm diameter pipe bushed down to the
1/4 NPT control line connection in the pilot body.
2. For both body-sized and swaged pipelines, locate
the pipeline control line connection in a section of
straight pipe at least 10 pipe diameters away from
the regulator or swage.
3. Do not locate the pipeline control line connection in
an elbow, swage or other area where turbulence or
abnormal velocities may occur.
4. If the pilot is mounted with the control line in a
position other than horizontal, make sure the
control line is sloped away from the pilot so that
condensate can drain into the pipeline.
5. Install a shutoff valve (not a needle valve) in
the control line to completely isolate the pilot
during maintenance.
6. Install a pressure gauge in the control line or near
the regulator to aid in setting the outlet pressure.
Each pilot-operated regulator is factory-set for the
pressure setting specified on the order. If no setting
is specified, the unit is factory-set at 30 psig /
2.1 bar. In all cases, check the spring setting to
make sure it is correct for the application.
Pressure-Loaded Regulators
To install a pressure-loaded regulator:
1. Install a shutoff valve in the pressure-loading
piping or tubing.
2. Connect the piping or tubing to the 1/4 NPT
connection in the diaphragm flange (key 2, Figure 8).
If the loading regulator used with the pressure-
loaded regulator does not provide internal relief, an
atmospheric bleed (e.g., no. 60 drill size) is required if
the loading supply is air, or a downstream bleed line is
required if the loading supply is steam. This installation
is shown in Figure 4.
The pressure setting of a pressure-loaded regulator
is adjusted and determined by the pressure-loading
8
Note
device. In all cases, check the pressure setting to
make sure it is correct for the application.
Startup
The maximum inlet pressure for a specific construction
is stamped on the main valve nameplate. Use
pressure gauges to monitor upstream and downstream
pressures during startup.
To put the regulator into operation:
1. Open the control line shutoff valve.
2. For a pilot-operated regulator, open the
downstream block valve.
For a pressure-loaded regulator, open the shutoff
valve in the pressure-loading piping or tubing.
3. Slowly open the upstream block valve.
4. If a bypass line is used, slowly close the bypass
line block valve.
5. To adjust the downstream pressure, follow the
appropriate procedure:
a. For a pilot-operated regulator, loosen the
jam nut (key 15, Figure 9). Turn the adjusting
screw (key 16, Figure 9) into the spring case
to increase the downstream pressure. Turn
the adjusting screw out of the spring case to
decrease the downstream pressure. When the
required downstream pressure is maintained for
several minutes, tighten the jam nut to lock the
adjusting screw in position.
b. For a pressure-loaded regulator, refer
to the Instruction Manual of the pressure-
loading device for downstream pressure
adjustment procedures.
Safety Override Pilot Startup
and Adjustment
1. Loosen adjusting screws of the Type 6492HM (or
6492HTM) safety override pilot and Type 6392
intermediate pilot on the upstream valve until there
is no spring load. The screws should turn freely
by hand.
2. Loosen the adjusting screw of the Type 6392
pilot on the downstream valve until there is no
spring load.
3. Tighten the Type 6492HM (or 6492HTM) safety
override pilot of the upstream valve all the way in
to its highest spring setting.
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