Data Sheet

Smart Bleed™ Airset

An airset that is smart enough to know when

fail-safe conditions must be executed

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Type 67CFR with Smart Bleed Mounted to Type 667 Actuator

Ensuring Actuator Failure Mode

Any airset piped directly to an actuator or to devices that

consume air intermittently can lead to a problem of trapping

pressure in the actuator if a xed bleed is not installed. The

trapped pressure locks the actuator in last position. Since

regulators respond to changes in downstream pressure, not

inlet pressure, the regulator remains locked up when supply

pressure is lost. A means to exhaust the trapped pressure

is required.

Optimized Performance

Fisher

Smart Bleed Airset allows downstream pressure in an

actuator or other instrument to exhaust if supply pressure

is lost. In turn allowing the actuator to fail in the desired

Lower Operating Costs

position. The use of the Smart Bleed eliminates the need for a

xed bleed, and should be used when supplying air to a dead-

end system.

Lower operating costs

The cost to power pneumatic instruments in chemical,

hydrocarbon and process industries is continuing to increase,

and along with it the need to minimize leakage wherever

possible. Intensive laboratory testing shows the Type 67CFR

internal relief valve has tight shutoff. Combined with the

benets of the Smart Bleed, continuous steady state air

consumption is eliminated. Plant resources are conserved

and the cost to power pneumatic and digital instruments

is reduced.

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Smart Bleed™ Airset An airset that is smart enough to know when fail-safe conditions must be executed Type 67CFR with Smart Bleed Mounted to Type 667 Actuator Lower Operating Costs Ensuring Actuator Failure Mode Any airset piped directly to an actuator or to devices that consume air intermittently can lead to a problem of trapping pressure in the actuator if a fixed bleed is not installed. The trapped pressure locks the actuator in last position.
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INLET PRESSURE INLET PRESSURE INLET PRESSURE OUTLET PRESSURE OUTLET PRESSURE OUTLET PRESSURE ATMOSPHERIC PRESSURE ATMOSPHERIC PRESSURE ATMOSPHERIC PRESSURE Type 67CFR Smart Bleed™ Schematic Best in Class Design Best in class design The Smart Bleed Airset incorporates the use of a differential check valve between the inlet and outlet pressure cavities of the Type 67CFR. During normal operation the check valve remains closed.