Model 66BP0 pages

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^ Model 66BP Pneumatic Stainless Steel Back Pressure Regulator

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Model

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66BP

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The Model 66BP Stainless Steel

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Regulator is designed for corrosive

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environments and high temperatures.

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Features

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• Control sensitivity to 1" water column allows

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use in precision applications.

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• Large Control Diaphragm area for

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increased sensitivity.

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• Fluorocarbon Elastomers are compatible

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with corrosive materials and environments.

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•Valve Damper eliminates hunting and

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buzzing.

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• Line or Panel Mounting provides flexibility

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for installation.

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Operating Principles

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When you adjust the Range Screw to a

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specific setpoint, the Range Spring exerts a

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downward force against the top of the

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Control Diaphragm. This downward force

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closes the Relief Valve. When the force

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from the system pressure that acts on the

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bottom of the Control diaphragm is less

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than the force that acts on the top of the

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Control Diaphragm, the Relief Valve

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remains closed.

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When the system pressure increases, the

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force that acts on the bottom of the Control

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Diaphragm increases until it reaches the

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setpoint.

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When the system pressure rises above the

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setpoint, the Diaphragm Assembly moves

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upward lifting the Relief Valve from its seat

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and vents the excess pressure from the

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system. The relief valve closes as set

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point is reached.

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Range

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Screw

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' Range

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Spring

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Control

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' Diaphragm

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'System

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Pressure

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To Atmosphere

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Knob Adjust

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WSr (optional)

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Panel Mount

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(optional)

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5/8-18 UNF-2A

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to 1/8 of surface

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1/4 NPT

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To Atmosphere

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(typical)

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1/4 NPT

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System

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Pressure

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(typical)

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Rev B 042007

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800-334-8422

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