Model 30BP0 pages

A
Model
30BP
Model 30BP Midget Precision Back Pressure Regulator
Features
• he Model 30BP is a high capacity back
T
pressure regulator that relieves excess
system pressure to maintain a setpoint.
• ombination of high capacity and compact
C
size make the Model 30BP an excellent
choice for a wide range of precision
applications including: Precise Control of
Paper Machinery Felt Guides, Supply of a
Precise Repeatable Signal to a Pneumatic
Clutch, or Control of Cylinder Pressure.
• he Model 30BP is sensitive to 1/4" Water
T
Column variation which permits use in
precision processes.
• low of up to 40 SCFM allows use in
F
applications with high flow requirements.
• Separate Control Chamber and Aspirator
A
Tube isolates the diaphragm from the main
flow eliminating hunting and buzzing.
Operating Principles
The Model 30BP Regulator uses the force
balance principle to open the Relief Valve
and vent system pressure when the set point
is exceeded.
Downstream pressure is transmitted through
the Aspirator Tube to the bottom of the
Diaphragm Assembly. When you adjust
the range screw for a specific set point, the
Range Spring compresses and exerts a force
on the top of the Diaphragm Assembly. As
long as the pressure acting on the bottom of
the Diaphragm Assembly
produces a force less than the spring force
acting on the top of the Diaphragm
Assembly, the Relief Valve remains closed.
When system pressure increases, the force
on the bottom of the Diaphragm Assembly
increases until it reaches the set point.
When system pressure increases beyond the
set point, the assembly moves upward, lifting
the Relief Valve from its seat and vents the
downstream air.
If downstream pressure decreases below the
set point, the assembly moves downward
closing the Relief Valve.
26
800-334-8422
www.fairchildproducts.com