Dwyer AFR - Manual

Series AFR Air Filter Regulator
Specifications - Installation and Operating Instructions
Bulletin F-42-AFR
The Series AFR Air Filter Regulators are designed to provide clean,
accurate air pressure to instruments, valves and other automatic control
equipment under variable conditions. The regulators are designed for air
service only. Maximum allowable inlet pressure is 250 psi. Operating
temperature is 0 to 160°F. The Series AFR has a low capacity internal
relief which provides very limited down stream over pressure protection.
To avoid exceeding outlet pressure limits in service, a pressure relieving
or pressure limiting device should be used.
INSTALLATION
Install the regulator as close as possible to the instrument or tool it is to
service. For best filter drainage, orient the valve so it is at the lowest
point on the dripwell housing. The words “IN” and “OUT” are cast into the
body to indicate the direction of flow.
OPERATION
Turning the adjusting screw changes the force exerted by the range
spring on the diaphragm assembly. In equilibrium of set pressure, the
force exerted by the range spring is balanced by the force from the
output pressure acting underneath the diaphragm.
An unbalanced state between the output pressure and the set pressure
causes a corresponding reaction in the diaphragm and supply valve
assemblies. If the output pressure rises above the set pressure, an
upward force is exerted on the diaphragm assembly causing the relief
seat to lift and open. Excess pressure is vented to atmosphere until
equilibrium is reached. If the output pressure drops below the set
pressure, the unbalanced force of the range spring causes a downward
force on the diaphragm assembly. The supply valve then opens until the
pressure builds up once more to the equilibrium condition.
Under forward flow conditions, the range spring force is balanced by the
diaphragm pressure force, with the supply valve open just enough to
maintain the required equilibrium pressure. When high flow occurs, a
specially designed aspirator helps maintain downstream pressure and
compensates for droop.
Prior to turning on supply air, back off adjusting screw until there is no
compression of the range spring. After turning supply pressure on, turn
the adjusting screw clockwise to increase outlet pressure.
SPECIFICATIONS
Service: Air only.
Output Ranges: 0 to 10 psi (0 to 70 kPa), 0 to 30 psi (0 to 200 kPa), 0 to
60 psi (0 to 400 kPa), and 0 to 120 psi (0 to 800 kPa).
Maximum Supply Pressure: 250 psig (1700 kPa).
Port Size: 1/4˝ NPT(F) in, out, and gage.
Mounting: Pipe or through body.
Flow Capacity: 20 SCFM (33.0 m
3 /hr) at 100 psig (700 kPa) supply with
20 psig (140 kPa) output.
Exhaust Capacity: 0.1 SCFM (0.17 m
3 /hr) with downstream pressure 5
psig (35 kPa) above set point.
Sensitivity: 1˝ (2.5 cm) of water.
Air Consumption: Less than 6 SCFH (0.17 m
3 /hr).
Filter Size: 40 micron.
Effect of Supply Pressure Variation: Less than 0.2 psig (1.4 kPa) for 25
psi (170 kPa) change.
Materials of Construction: Body: Aluminum Alloy, Irridite, and baked
epoxy finish; Filter: Phenolic Impregnated Cellulose; Diaphragm and Valve
seat Plug: Nitrile Elastomer.
Weight: 1.6 lb (725 g).
3.130
[79.5]
3.130
[79.5] DRAIN
7-3/4
[196.8]
2-19/32
[65.8]
21/32
[16.5]
2-53/64
[71.6]
INPUT
1/4˝ NPT
3/8
[9.6]
GAUGE PORT
1/4˝ NPT
OUTPUT
1/4˝ NPT
PROXIMITY CONTROLS
Phone: 219/879-8000 www.dwyer-inst.com
A DIVISION OF DWYER INSTRUMENTS, INC. Fax: 219/872-9057 e-mail: [email protected]
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