A3725
!
NEEDLE
VALVE
WORKING REGULATOR
CONTROL LINE
TYPE 627M SET LOWER
THAN WORKING REGULATOR
GRAVITY FEED
ALCOHOL DRIP POT
VENT VALVE
INLET
EQUALIZING LINE
HAND
VALVE
Figure 3. De-Icer System Operational Schematic
WARNING
Adjustment
The range of allowable pressure settings is marked on
the nameplate. If a pressure setting beyond this range
is necessary, substitute the appropriate regulator control
spring. Change the nameplate to indicate the new
pressure range.
Before increasing the setting, refer to Table 1, 2, 3 or 4.
Review the pressure limits for the control spring range being
used and be certain that the new pressure setting will not
result in an overpressure condition.
Note
Always use a pressure gauge to monitor
pressure when making adjustments.
Refer to Figures 7 through 13 for key number locations.
1. Remove the adjusting screw cap (key 36).
2. Loosen the locknut (key 34).
3. Increase the outlet pressure setting by turning the
adjusting screw (key 35) clockwise. Decrease the
outlet pressure setting by turning the adjusting
screw counterclockwise.
4. When the desired pressure is obtained, hold the
adjusting screw (key 35) in place and tighten the locknut
(key 34).
Refer to Type OS2 Instruction Manual (D102778X012) for
instructions on adjusting the slam-shut.
Shutdown
To avoid personal injury or property damage
due to explosion or damage to regulator or
downstream components during shutdown,
release downstream pressure to prevent an
overpressure condition on the diaphragm of
the regulator.
1. Close the nearest upstream shut-off valve.
2. Close the nearest downstream shut-off valve.
3. Open the vent valve between the regulator and the
downstream shut-off valve nearest to it.
4. For a Type 627, 627H, 627R or 627LR regulator, the
regulator will open to release pressure between the
upstream shut-off valve and the regulator.
5. A Type 627M, 627HM or 627MR regulator requires
venting the control line and downstream pressure
from the regulator before maintenance. The pressure
between these shut-off valves is released through
the open regulator because the disk assembly
remains open in response to the decrease in control
line pressure.
6. Type 627OSX with underpressure protection may
trip and trap gas upstream of the regulator. It is
recommended to also open an upstream vent to allow
gas to escape.
7
627 Series
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