67CFR-239 Fisher Instrument Supply Filter Regulator
Fisher 67CFR has a filter and internal relief valve with a soft seat for
reliable shutoff with no discernible leakage.
Fisher 67CFR-239 direct-operated regulators and filter regulators
are typically used to provide constantly controlled, reduced
pressures to pneumatic and electropneumatic controllers and other
instruments. These are suitable for most air or gas applications.
Other applications include providing reduced pressures to air
chucks, air jets, and spray guns.
Principle of Operation
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 orifi ce and there is
no fl 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 orifi ce. This allows fl
ow through the regulator.
Internal Relief (Types 67CR, 67CSR, 67CFR, and 67CFSR)
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 flow
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.
|End Connection||1/4" NPT|
|Maximum Inlet Pressure||250 psig / 17.2 bar|
|Spring Range||0-125 psi/ 0-8.6bar|
|Smart Bleed Check Valve Set point||6 psi / 0.41 bar differential|
With Nitrile (NBR):
Standard Bolting: -20 to 180°F / -29 to 82°C
With Gauges: -40 to 180°F / -40 to 82°C
Fisher 67CFR Internal Relief Performance
Low capacity for minor seat leakage only; other overpressure
protection must be provided if inlet pressure can exceed the
maximum pressure rating of downstream equipment or exceeds maximum
outlet pressure rating of the regulator.
Smart Bleed Check Valve Set point
6 psi / 0.41 bar differential
Fisher 67CFR Filter Regulator : Filter Capabilities
Free Area: 12 times pipe area
Micron Rating: Polyethylene Filter (Standard): 5 microns Glass Fiber Filter (Optional): 5 microns PVDF or Stainless Steel Filter (Optional): 40 microns
Drain Valve and Spring Case Vent Location
Aligned with inlet standard, other positions optional
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 flow demand but is expected to backflow 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 flow upstream through the regulator and check
valve. This option eliminates the need for a fixed 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.
Types 67CR, 67CSR, 67CFR, and 67CFSR 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 the maximum outlet pressure rating of the regulator.