Model DFC and DFO Valve Actuator Dyna-Flo Control Valve Services Ltd. Phone: 780 • 469 • 4000 Toll Free: 1 • 866 • 396 • 2356 Fax: 780 • 469 • 4035 Website: www.dynaflo.com P-DFCOB1017B 1 Technical Sales Bulletin The Model DFC and DFO 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. Both model DFC and DFO 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 valve, the DFC or DFO 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. Figure 1 Models DFC and DFO Actuators Features Reliable Design Formed diaphragm has no friction with other moving parts allowing maintenance free operation through years of constant cycling. Protective Coatings External surfaces are either epoxy or powder coated for optimum resistance to harsh environments. Individually Tested Each actuator receives extensive testing to confirm smooth leak free operation. Designed for Instrument Mounting Integrated mounting pads with threaded holes make easy work of mounting instruments to the actuator. The open yoke allows easy access to stems for feed arms. Travel Indication Highly visible travel scale is adjustable for precise position indication.
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The Model DFC and DFO series linear output spring and diaphragm actuators are used in all kinds of demandingapplications. 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.Both model DFC and DFO 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 valve,the DFC or DFO 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 specifi cations used in manufacturing the Model DFC and DFO series linear pneumatic actuators ensures superior performance and customer satisfaction.
Figure 1 Models DFC and DFO Actuators
FeaturesReliable DesignFormed diaphragm has no friction with other moving parts allowing maintenance free operation through years of constant cycling.
Protective CoatingsExternal surfaces are either epoxy or powder coated for optimum resistance to harsh environments.
Designed for Instrument MountingIntegrated mounting pads with threaded holes make easy work of mounting instruments to the actuator. The open yoke allows easy access to stems for feed arms.
Travel IndicationHighly visible travel scale is adjustable for precise position indication.
OperationThe Model DFC spring return diaphragm actuator (Figure 6) employs time proven reliable technology. As the instrument signal to the sealed lower diaphragm casing is increased, the force generated by that pressure on the diaphragm, and diaphragm plate, force the diaphragm plate and actuator stem up, compressing the spring.
The lifting action is transferred to the valve stem through a secure split and bolted connecting block. On a decrease, or complete loss of pneumatic signal, the actuator spring will force the actuator stem to extend, putting the valve in it’s failsafe position. Using a push down to close action valve with a Model DFC will result in a fail closed valve assembly.
The Model DFO spring return diaphragm actuator is also time proven. Refer to Figure 7. As the instrument signal to the sealed upper diaphragm casing is increased, the force gener-ated by that pressure on the diaphragm, and diaphragm plate, force the diaphragm plate and actuator stem down, compressing the spring. The extension action is transferred to the valve stem through a secure split and bolted connecting block. On a decrease, or complete loss of pneumatic signal, the actuator spring will force the actuator stem to retract, putting the valve in it’s failsafe position. Using a push down to close action valve with a Model DFO will result in a fail open valve assembly.
Handwheels (Figures 8 & 9)Top mounted handwheels are the cost effective option available for manual override for DFC and DFO actuators. The top mounted handwheel is a good choice for emergency only positioning of a valve, and it is commonly used as a travel stop. These top mounted handwheels are available in all actuator sizes.
External Travel Stops (Figures 10 & 11)Top mounted handwheel based travel stops are available to restrict valve opening or closing. Confi gurations are available with caps to reduce tampering.
Turns Per Travel Rim Force(1) Maximum HandweelOutput Force(2)
Per Inch Per mm lb N lb N
1046 8.75 (222) 8 0.3 32 142 1,500 6,672
1069 8.75 (222) 8 0.3 48 214 2,250 10,009
2069 8.75 (222) 8 0.3 48 214 2,250 10,009
2105 12.00 (305) 8 0.3 95 423 3,390 15,079
2156 12.00 (305) 8 0.3 110 489 5,100 22,686
3105 12.00 (305) 8 0.3 95 423 3,390 15,079
3156 12.00 (305) 8 0.3 110 489 5,100 22,686
32203220-4 14.00 (356) 5 0.3 136 605 6,600 29,358
NOTES:1 - Tangential handwheel force required to produce the handwheel output force shown. (Proportional to the handwheel output force).2 - The maximum force available to compress actuator spring.
Table 3
DFC Top Mounted Handwheel Specifi cations
Actuator SizeHandwheelDiameterInch (mm)
Turns Per Travel Rim Force(1) Maximum HandweelOutput Force(2)
NOTES:1 - Tangential handwheel force required to produce the handwheel output force shown. (Proportional to the handwheel output force).2 - The maximum force available to compress actuator spring.
P 3/8 INCH L 7/16 INCH K 1/2 INCH J 5/8 INCHA 3/4 INCH M 7/8 INCH I 1 INCH B 1-1/8 INCHR 1-1/4 INCH C 1-1/2 INCH T 1-5/8 INCH D 2 INCHN 2-1/8 INCH S 2-1/4 INCH E 2-1/2 INCH F 3 INCHQ 3-3/8 INCH G 3-1/2 INCH H 4 INCH
LOWER BENCH SET06
ACTUAL VALUE (PSI) EXAMPLE: 03, 06, 17, 21, ETC.
UPPER BENCH SET30
ACTUAL VALUE (PSI) EXAMPLE: 27, 09, 15, 30, ETC.INPUT SIGNAL (AIR TO DIAPHRAGM)
I0 - 18 PSIG 0 - 33 PSIG I 3 - 15 PSIG I 6 - 30 PSIG
HANDWHEEL AND TRAVEL STOPS
NN NONE (STANDARD) S SIDE MOUNTED HANDWHEELT TOP MOUNTED HANDWHEEL 1 TYPE 1 UP STOP - DFO2 TYPE 2 DOWN STOP - DFO 3 TYPE 3 DOWN STOP - DFC4 TYPE 4 UP STOP - DFC 5 TYPE 5 UP STOP - DFC
CONNECTING BLOCK OPTIONS
-- NONE T TAPPED 1/4” - 20 UNCB TAPPED 3/8” - 16 UNC F TAPPED 5/8” - 18 UNCH
CONSTRUCTION OPTIONSN
N NONE S STAINLESS STEEL FASTENERSYOKE OPTIONS
YNONE Y TAPPED 5/16” - 18 UNC
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Neither Dyna-Flo Control Valve Services Ltd., nor any of their affi liated entities assumes responsibility for the selection, use and maintenance of any product. Responsibility for selection, use and maintenance of any product remains with the purchaser and end-user.