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52 DUALRANGE ® CONTROL VALVE<br />
The Dualrange is a uniquely designed bonnet with double<br />
nested compressors for the use of throttling and<br />
controlling the flow of process fluids.<br />
The Dualrange Valve is the first diaphragm valve<br />
designed expressly for control work. Available in sizes<br />
1"– 6" (DN 25–150), it combines all the advantages of<br />
ITT weir-type diaphragm valves with greatly improved<br />
throttling characteristics. The Dualrange utilizes the<br />
Dia-Flo actuator and has greater rangeability than<br />
other diaphragm valves, due to the dual nested compressors<br />
unique to <strong>Pure</strong>-Flo Solutions Group.<br />
SIZE RANGE<br />
1"– 6" (DN 25–150)<br />
PRESSURE/TEMPERATURE<br />
See Chart on page 75.<br />
BONNET MATERIAL<br />
Coated Ductile Iron (see page #25)<br />
ACTUATION<br />
Dia-Flo pneumatic actuator is available in Direct,<br />
Reverse or Double Acting. Refer to the Dia-Flo<br />
Diaphragm Valves Selection Guide for dimension and<br />
sizing information.<br />
POSITIONER<br />
Conoflow and Moore positions are available. Refer to<br />
the Dia-Flo Engineering and Service guide for dimensional<br />
and sizing information.<br />
APPLICATIONS<br />
The Dualrange Control Valve is well suited for the<br />
following services:<br />
• Where valves large enough to handle normal<br />
process flows cannot throttle low enough to<br />
control small amounts of flow required during<br />
start-up operations<br />
• Where batching operations require a need for<br />
increased process control<br />
• Where abrasives reduce valve life on throttling<br />
applications<br />
• Where split-ranging has been necessary to<br />
provide rangeability not available in a single<br />
diaphragm valve
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