Data Sheet

Bulletin 71.1:67C
5
Note
During normal operation the check valve’s
metal to metal seat allows limited ow
through the regulator from the inlet to outlet,
even when there is no downstream demand.
To prevent downstream pressure buildup, the
smart bleed option is only available with the
internal relief version of the 67C Series.
Installation
The 67C Series regulators may be installed in any position.
Spring case vents must be protected against the entrance
of rain, snow, debris, or any other foreign material that might
plug the vent openings. The inlet connection is marked
“In” and the two outlet connections are marked “Out”. If a
pressure gauge is not installed in one outlet connection, plug
the unused connection. See Figures 5 to 9 for dimensions.
Emerson Process Management Regulator Technologies, Inc.
(Regulator Technologies) provides an instruction manual with
every regulator shipped. Refer to this for complete installation,
operation, and maintenance instructions. Included is a complete
listing of individual parts and recommended spare parts.
Overpressure Protection
The 67C Series regulators have maximum outlet pressure
ratings that are lower than their maximum inlet pressure
ratings. A pressure-relieving or pressure-limiting device is
needed if inlet pressure can exceed the maximum outlet
pressure rating.
Type XXXX
MXXXX
Month Year
Type XXXX
INLET PRESSURE
OUTLET PRESSURE
ATMOSPHERIC PRESSURE
INTERMEDIATE PRESSURE
PILOT SUPPLY PRESSURE
LOADING PRESSURE
INLET PRESSURE
OUTLET PRESSURE
ATMOSPHERIC PRESSURE
TYPE 67CR OR 67CSR
TYPE 67C OR 67CS
TYPE 67CF OR 67CFS
SMART BLEED™ OPTION
TYPE 67CFR OR 67CFSR ONLY
TYPE 67CFR OR 67CFSR
W8442
W7433
Figure 2. 67C Series Operational Schematics
Types 67CR, 67CSR, 67CFR, and 67CFSR regulators have
a low capacity internal relief valve for minor seat leakage
only. Other overpressure protection must be provided if the
maximum inlet pressure can exceed the maximum pressure
rating of the downstream equipment or exceeds maximum
outlet pressure rating of the Type 67CR, 67CSR, 67CFR, or
67CFSR regulator.
Overpressuring any portion of a regulator or associated
equipment may cause leakage, parts damage, or personal
injuryduetoburstingofpressure-containingpartsor
explosion of accumulated gas. Regulator operation within
ratings does not preclude the possibility of damage from
external sources or from debris in the pipeline. A regulator
should be inspected for damage periodically and after any
overpressure condition.
Refer to the Capacity Information section and the
Wide-OpenFlowCoefcientsforReliefValveSizinginthe
Specicationssectiononpage2todeterminetherequired
relief valve capacity.
Capacity Information
Table 4 shows the air regulating capacities of the 67C Series
regulators at selected inlet pressures and outlet pressure
settings. Flows are shown in SCFH (at 60°F and 14.7 psia)
and in Nm
3
/h (at 0°C and 1.01325 bar) of air.
Note
The 67C Series regulators may be sized
for 100% ow using capacities as shown
in Table 4. It is not necessary to reduce
published capacities.