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Precision Regulators
1/4" – Basic 1/4" Body

Features
• Control sensitivity of .250"
(.63 cm) water column variation
allows use in precision
applications.
• A compensating diaphragm lets
the regulator remain unaffected
by supply pressure changes.
• Flow of up to 40 SCFM with
100 PSIG supply allows use
in applications with high flow
requirements.
• An aspirator tube compensates
downstream pressure droop
under flow conditions.
• A separate Control Chamber
isolates the diaphragm from the
main flow to eliminate hunting
and buzzing.
• Unit construction lets you service
the Regulator without removing it
from the line.

Operating Principles
The WRA302 Regulator uses the force balance principal
to control the movement of the valve assembly which in
turn controls the output pressure. When the regulator is
adjusted for a specific set point, the downward force of
the Positive Bias Spring causes the Diaphragm Assembly
to move downward. The Supply Valve opens and allows
air to pass to the Outlet Port. As the set point is reached,
the downward force exerted by the Positive Bias spring is
balanced by the upward force of the downstream pressure
acting on the bottom of the Diaphragm Assembly. The
resultant force moves the supply Valve upward to reduce the
flow of air to the Outlet Port.
Outlet pressure is maintained as a result of balance between
forces acting on the top and bottom of the Diaphragm
Assembly.

Specifications
Supply Pressure........... 250 PSIG, (17.0 bar), (1700 kPa) Maximum
Flow Capacity –
40 SCFM (68 m3/HR) @ 100 PSIG, (7.0 bar), (700 kPa) Supply
and 20 PSIG, (1.5 bar), (150 kPa) Setpoint
Exhaust Capacity –
2.0 SCFM (3.4 m3/HR) where Downstream Pressure is 5 PSIG,
(.35 bar), (35 kPa) above 20 PSIG, (1.5 bar), (150 kPa) Setpoint
Supply Pressure Effect –
Less than 0.2 PSIG, (.014 bar), (.14 kPa) for 100 PSIG, (7.0 bar),
(700 kPa) change in Supply Pressure
Sensitivity........................ .250" (.010 PSIG) (.64 cm) Water Column
Ambient Temperature....................-40°F to +200°F, (-40°C to 93°C)
Hazardous Locations –
Acceptable for use in Zones 1 and 2 for Gas Atmosphere:
Groups IIA and IIB and Zones 21 and 22 for Dust Atmospheres