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Type 92S
• The pressure-loading device in conjunction with
the control spring adjustment on a pressure-
loaded pilot. In both cases, check these settings
to make sure they are correct for the application.
Startup and Adjustment
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.
Adjustment
On a regulator with any kind of Type 6492L, 6492H
or 6492HT pilot, loosen the hex nut (key 16, Figure 4).
Turn the adjusting screw (key 15, Figure 4) clockwise
or into the spring case to increase the downstream
pressure. Turn the adjusting screw counterclockwise
or out of the spring case to decrease the downstream
pressure. When the required downstream pressure is
maintained for several minutes, tighten the hex nut to
lock the adjusting screw in position.
On a regulator with a pressure-loaded Type 6492L,
6492H or 6492HT pilot, also refer to the instruction
manual of the pressure-loading device for downstream
pressure adjustment procedures. Make sure that the
combined pilot control spring setting pressure and
spring case loading pressure do not exceed 25 psig /
1.7 bar for the Type 6492L pilot, 150 psig / 10.3 bar
for the Type 6492H pilot, or 25 psig / 17.2 bar for the
Type 6492HT. For example, a 5 psig / 0.34 bar spring
setting and a 10 psig / 0.69 bar pressure loading result
in a regulator pressure of 15 psig / 1.0 bar.
Safety Override Pilot Startup
and Adjustment
1. Loosen adjusting screws of the Type 6492HM
or 6492HTM safety override pilot and Type 6492H
or 6492HT 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 6492H
or 6492HT 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.
*Regulator Technologies recommends establishing setpoint by tightening the adjusting screw.
10
Note
4. Tighten the Type 6492H or 6492HT pilot of
the upstream valve all the way in to its highest
spring setting.
5. Tighten the Type 6492H or 6492HT pilot
of the downstream valve to the desired
downstream pressure.
6. * Loosen the Type 6492H or 6492HT
intermediate pilot on the upstream valve to the
desired intermediate pressure (normally 50% of
inlet pressure).
7. Loosen the Type 6492HM or 6492HTM safety
override pilot of the upstream valve until there is
no spring load.
8. Tighten the Type 6492H or 6492HT pilot of the
downstream valve all the way in to its highest
spring setting.
9. Tighten the Type 6492HM or 6492HTM safety
override pilot of the upstream valve to desired
pressure as specified per ASME Boiler and
Pressure Vessel Code, Section VIII.
10. * Loosen the Type 6492H or 6492HT pilot of the
downstream valve to the desired downstream
pressure setpoint.
Startup with New Regulator Installation
1. Remove all pilot control spring compression by
turning the adjusting screw out of the spring case
according to the adjustment procedure.
2. Slowly open the upstream block valve.
3. Open the downstream block valve.
4. Open the control line shutoff valve.
Before finally adjusting the pilot setting,
allow enough time for the pilot and
main valve to heat up and boil off any
condensate buildup.
5. If a bypass is used, slowly close the bypass line
block valve.
6. Perform the adjustment procedure until the
downstream pressure reaches the desired setting.
Note
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