CP400 Series
8
Installation and Overpressure
Protection
!
WARNING
Personal injury or system damage may
result if this regulator is installed, without
appropriate overpressure protection,
where service conditions could exceed
the limits given in the Specications
section and/or regulator nameplate.
Regulator installations should
be adequately protected from
physical damage.
All vents should be kept open to permit
free ow of gas to the atmosphere. Protect
openings against entrance of rain, snow,
insects or any other foreign material that
may plug the vent or vent line. On outdoor
installations, point the spring case vent
downward to allow condensate to drain
(see Figures 5 through 7).
This minimizes the possibility of freezing
and of water or other foreign materials
entering the vent and interfering with
proper operation.
For the Type CP403 with the Integral
Monitor or the Type CP404 with Slam
Figure 4. Type CP404IN Pressure Loaded Regulator with Slam-shut Module and Internal Pressure Registration Operational Schematic
M1068
TYPE VSX4 SLAM-SHUT MODULE
PRIMARY REGULATOR
TYPE 67CP PRESSURE
LOADING REGULATOR
EXTERNAL CONTROL LINE PLUG
(DO NOT REMOVE IF UNIT IS
PRESSURIZED)
OPSO ADJUSTING SCREW
OPSO SET SPRING
VENT
RESET KNOB
SLAM-SHUT
ORIFICE
UPSO
SPRING
UPSO ADJUSTING SCREW
SHUT-OFF DISK
shut, point the vents of both the Primary
Regulator and Integral Monitor or Slam
shut downward to allow condensate
to drain. From the factory, the Integral
Monitor or Slam shut will always point
in the same direction as that of the
Primary Regulator.
Under enclosed conditions or indoors,
escaping gas may accumulate and be
an explosion hazard. In these cases,
the vent should be piped away from the
regulator to the outdoors.
CAUTION
The CP400 Series regulators have an
outlet pressure rating lower than their
inlet pressure rating. If actual inlet
pressure can exceed the outlet pressure
rating, outlet overpressure protection
is necessary. However, overpressuring
any portion of the regulators beyond
the limits in Specications section may
cause leakage, damage to regulator
parts or personal injury due to bursting
of pressure-containing parts.
Some type of external overpressure
protection should be provided to the
CP400 Series if inlet pressure will be
INLET PRESSURE
OUTLET PRESSURE
LOADING PRESSURE
ATMOSPHERIC PRESSURE
(12 pages)
(1 pages)
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