Model
DFC Valve Actuator
Operation, Parts and Instruction Manuals
Dyna-Flo Control Valve Services Ltd.
Edmonton, Alberta, CANADA
Website: www.dynaflo.com
Phone: 780
• 469 • 4000
Toll Free: 1 • 866 • 396 • 2356
Fax: 780 • 469 • 4035
Instruction Manual May 2007
2
!NOTICE! These instructions are meant to be used in conjunction with the Dyna-Flo DFC/
DFO Series Technical (Sales) Bulletin. If you do not have the Technical Bulletin,
contact Dyna-Flo immediately, or visit www.dynaflo.com
It is the intention of this document to provide users with an accurate guide for
safe installation and maintenance of Model DFC valve actuators. Revisions and
updates are available at above mentioned website.
Introduction
The Model DFC series linear output spring and diaphragm actuators are used in all kinds of demanding
applications. The large area of the diaphragm allows low-pressure operation, and the spring provides fail
safe positioning of a control valve on loss of the pneumatic supply. Model DFC actuators are used to
automate control valves in both throttling and on/off control of liquids or gases.
When combined with a Dyna-Flo Model DF2000 or 360 control valve, the DFC is part of a rugged control
valve assembly, to which a wide variety of controllers and instruments can be attached.
Dyna-Flo’s high level of quality specifications used in manufacturing the Model DFC and DFO series linear
pneumatic actuators ensures superior performance and customer satisfaction.
! CAUTION !
To avoid personal injury or installation damage as a result of the sudden release of process
pressure or the breaking of parts, do not install the actuator assembly where service
conditions could exceed the limits stated in this manual or on the equipment nameplates. Only
well trained experienced technicians should perform these procedures. Be sure to use
safe work practices and lockout procedures. Always be aware of the hazards of spring-loaded
actuators. Be sure that they are in the failed (de-energized) position before performing any
maintenance procedure. These actuators have dangerous pinch points. Never put your hands
inside the valve unless you are certain that the actuator cannot move.
General
The following instructions are to be thoroughly reviewed and understood prior to installing,
operating or performing maintenance on this equipment. Work on this equipment should be
done by experienced personnel. Throughout the manual, safety and caution notes appear and
must be strictly followed to prevent serious injury or equipment malfunction.
Scope
This manual will provide detailed information on the complete disassembly and reassembly of the Model
DFC pneumatic actuator. Refer to seperate instruction manuals for the installation of positioners and all
other accessories used with these actuators. Do not apply any other conditions to the actuator without
first contacting your Dyna-Flo sales office.
This manual is written to be a practical and useful guide to successfully using the Dyna-Flo Model DFC for
many years.
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