Fisher 67CFR User Manual

67C Series
3
Type XXXX
MXXXX
Month Year
Type XXXX
INLET PRESSURE
OUTLET PRESSURE
ATMOSPHERIC PRESSURE
INTERMEDIATE PRESSURE
PILOT SUPPLY PRESSURE
LOADING PRESSURE
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



W7433
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Figure 2. 67C Series Operational Schematics
W8442
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

Downstream pressure is registered internally on the
lower side of the diaphragm. When the downstream
pressure is at or above the set pressure, the valve plug
is held against the orice and there is no ow through
the regulator. When demand increases, downstream
pressure drops slightly allowing the spring to extend,
moving the stem down and the valve plug away from
the orice. This allows ow through the regulator.


If for some reason, outside of normal operating
conditions, the downstream pressure exceeds the
setpoint of the regulator, the force created by the
downstream pressure will lift the diaphragm until the
diaphragm is lifted off the relief seat. This allows ow
through the token relief. The relief valve on the
Type 67CR, 67CSR, 67CFR, or 67CFSR is an
elastomer plug that prevents leakage of air from the
downstream to atmosphere during normal operation,
thereby conserving plant air.
Smart Bleed™ Airset
In some cases, it is desired to exhaust downstream
pressure if inlet pressure is lost or drops below the
setpoint of the regulator. For example, if the regulator
is installed on equipment that at times has no ow
demand but is expected to backow on loss of inlet
pressure. The Types 67CFR and 67CFSR can be
ordered with the Smart Bleed™ option which includes
an internal check valve for this application. During
operation, if inlet pressure is lost, or decreases below
the setpoint of the regulator, the downstream pressure
will back ow upstream through the regulator and check
valve. This option eliminates the need for a xed bleed
downstream of the regulator, thereby conserving
plant air.

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.

Fisher 67CFR Specifications

General

Model	67CFR
Manufacturer	Fisher
Temperature Rating	-20 to 180°F
Temperature Capabilities	-20° to 180°F
Body Material	Aluminum
Material	Aluminum
Connection Type	1/4" NPT