KVF
Flow Control Servovalve (FCS)
BLN-95-9061-4 |
Issued: February 2004 |
DESCRIPTION
The KVF Flow Control Servovalve is a precision servovalve that provides an output flow rate proportional to a low power electrical input signal. It features a torque motor-actuated, double-nozzle flapper pressure control pilot valve mated to a pressure-actuated, spring-centered boost valve module of a unique double-spool configuration.
The design of this servovalve does not require a centering feedback spring and ball for spool position. The servovalve's pilot stage is a stand-alone, closed loop pressure control valve which uses internal hydraulic pressure reactions to achieve its closed loop control characteristics.
This combination was selected to provide fabrication economies resulting in true servovalve performance at proportional valve pricing. The KVF Servovalve's steady state/dynamic response characteristics are compatible with industrial feedback control system applications.
FEATURES |
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Self-containedpressurefeedback,eliminatesrequirement |
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Units available in standard line-to-line or overlapped |
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for feedback spring and ball for spool position |
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configuration in all flows from 1 1/4 gpm to 20 gpm at no |
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ISO 4406 filtration rating of 18/15 (Nominal 10 micron |
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additional cost |
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filtering provides dependable performance) |
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Installation dimensions common to all servovalves |
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Standard manual operator assists with operation and |
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Pricing is independent of flow capability |
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system diagnostics |
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Four connector option: MS, 2-pin WP, 4-pin WP, or 2-2 |
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Requires low power dc current to drive rated flow; |
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pin WP |
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±20 mA, ±40 mA, ±100 mA, ±150 mA, or ±220 mA, are |
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Easily connected for unidirectional use from 2 1/2 gpm to |
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standard options. The ±20 mA, can be driven directly |
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from PLC. |
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35 gpm at 1000 psi rating |
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Does not require PWM drive for dither but is directly |
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Adaption maniflods available for conversion to other |
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compatible with other drives |
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valve patterns |
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4 to 20 mA version is configured such that 4 mA = 0 flow |
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Dual spool design provides added safety shut down if |
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and 20 mA = maximum flow |
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contamination causes failure of either spool |
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Unique two spool main body design allows for factory |
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Capability of separating control source from main stage |
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adjustment of null pressures at each working port |
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supply to accommodate high back pressure applications |
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ORDERING INFORMATION |
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KVF |
X X X X X |
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Ordering specifications for standard models. |
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Device Identity |
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DEVICE IDENTITY |
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The modle code for this device is KVF. |
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Rev |
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MODEL CODE |
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SUPPLY PRESSURE |
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Supply Pressure |
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A |
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500 to 3000 psi |
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C |
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200 to 1000 psi |
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Flow Rating |
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D |
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500 to 3000 psi with separate pilot drain |
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% Lap Split |
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E |
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2500 to 3000 psi |
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F |
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500 to 3000 psi w/o cylinder port orifices |
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Pilot Stage |
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G |
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500 to 3000 psi w/o cylinder port orifices |
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and with pilot drain |
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© Danfoss, 2013-09 |
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BLN-95-9076-2 |
1 |
ORDERING INFORMATION (continued)
FLOW RATING
MODEL CODE |
FLOW RATING |
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1 |
1.25 gpm |
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2 |
2.5 gpm |
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5 |
5 gpm |
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6 |
10 gpm |
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7 |
15 gpm |
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8 |
20 gpm |
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9 |
20 gpm with 300 lb/in springs |
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PILOT STAGE
% LAP SPLIT
MODEL CODE |
% LAP SPLIT 1 |
0Line-to-line 50%
1Standard overlap, 50%
2Standard overlap, 2%
3Heavy overlap, 50%
4Heavy overlap, 2%
1% of supply pressure at C1 and C2 when servo valve is at null.
PILOT STAGE |
DEVICE NUMBER |
RATED CURRENT |
COIL(s) |
CONNECTOR TYPE |
SCALE FACTOR |
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01 * |
MCV116A3102 |
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±150 mA |
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23 ohms |
Packard |
1.15 psid/mA |
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02 * |
MCV116A3101 |
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±150 mA |
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23 ohms |
MS |
1.15 psid/mA |
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03 * |
MCV116A3204 |
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±220 mA |
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16/19 ohms |
Packard |
0.78 psid/mA |
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05 * |
MCV116A1307 |
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±40 mA |
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69 ohms |
MS |
4.2 psid/mA |
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06 |
MCV116A1407 |
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±40 mA |
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106 ohms |
MS |
5.5 psid/mA |
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07 |
MCV116A1402 |
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±40 mA |
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106 ohms |
Packard |
5.5 psid/mA |
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08 * |
MCV116A1302 |
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±40 mA |
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69 ohms |
Packard |
4.2 psid/mA |
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09 |
MCV116A1501 |
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±20 mA |
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643 ohms |
MS |
12.6 psid/mA |
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10 * |
MCV116A3203 |
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±220 mA |
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16/19 ohms |
Packard (2) |
0.78 psid/mA |
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14 |
MCV116A1101 |
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±100 mA |
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23 ohms |
MS |
2.4 psid/mA |
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15 |
MCV116A3201 |
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±220 mA |
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16/19 ohms |
MS |
0.78 psid/mA |
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16 |
MCV116A1203 |
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±160 mA |
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16/19 ohms |
Packard (2) |
1.47 psid/mA |
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17 |
MCV116A1201 |
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±160 mA |
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16/19 ohms |
MS |
1.47 psid/mA |
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18 |
MCV116A1102 |
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±100 mA |
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23 ohms |
Packard |
2.4 psid/mA |
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19 |
MCV116A1502 |
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±20 mA |
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643 ohms |
Packard |
12.6 psid/mA |
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20 |
MCV116A3214 |
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±220 mA |
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16/19 ohms |
Deutsch |
0.78 psid/mA |
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21 |
MCV116A3100 |
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±150 mA |
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23 ohms |
No connector |
1.15 psid/mA |
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22 |
MCV116J1407 |
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Special, contact Danfoss |
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23 |
MCV116A1214 |
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±160 mA |
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16/19 ohms |
Deutsch |
1.47 psid/mA |
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24 |
MCV116A1315 |
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±40 mA |
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69 ohms |
No connector |
4.1 psid/mA |
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25 |
MCV116A1216 |
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±160 mA |
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16/19 ohms |
Deutsch |
1.47 psid/mA |
* 1.25, 2.5, and 5.0 gpm only.
TYPICAL APPLICATIONS
Air cargo loading |
Edger in feed board positioners |
For steering applications, |
Motion simulators |
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contact Danfoss |
Paper mill machinery |
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Asphalt pavers |
Injection molding machinery |
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Saw setworks positioners |
Platform leveling |
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Concrete pavers |
Edge guide control machinery |
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Manipulator arms / industrial robots |
Product testing machinery |
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Milling machines |
Marine deck machinery |
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Soil stabilizers |
Rocket motor testing equipment |
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Material mixing machinery |
Oil exploration equipment |
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Synchronized knife carriage servodrives |
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BLN-95-9061-4
2
TECHNICAL DATA
• Electric current in torque motor coil creates a magnetic |
• As the pressure torque on the flapper becomes equal to |
torque on armature |
the magnetic torque on the armature, the flapper moves |
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away from the closed nozzle to an equilibrium position |
• Armature/flapper rotates about torsion pivot |
producing a steady-state control pressure (PC1 or PC2) |
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on the ends of each valve spool |
• Flapper repositions towards one nozzle, which creates a |
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differential pressure between P1 and P2 |
• Each valve spool stops at a position where the control |
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pressure force on the end of each valve spool equals the |
• Each spool moves in the same direction opening the |
spring force on each valve spool |
supply )Ps) to output (C1 or C2) on one spool and the |
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output (C1 or C2) to return (PT) on the other spool |
• Therefore, valve spool position is proportional to input |
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current and, with a constant pressure drop across the |
• Differential pressure between P1 and P2 causes the |
spool meter-in and meter-out edges, the flow rate to the |
spools to move against the centering springs until the |
load is proportional to spool position |
spring force balances with the differential pressure |
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• Control pressure (PC1 or PC2) reflected to the flapper |
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produces torque on the flapper in opposition to the |
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magnetic torque on the armature |
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DIMENSIONS |
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1234567890123456789012
12345678901234567890122345678901234567890121 CAUTION
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Silicone oil is present and may drip when null is adjusted. Utilize #3/32 Allen Wrench to adjust.
NULL ADJUST ACCESS
3/8 O.D. TUBE
FITTING O-RING, PORT PER SAE - J514 9/16 - 18 UNF (2 - PL) PLUGS INSTALLED
184,15
(7.32)
EXTERNAL PILOT DRAIN
ON "D" MODEL ONLY
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11,43 |
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.312 DIA |
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(.45) |
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.566 O.D. |
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C1 |
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O-RING |
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(4-PL) |
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MANUAL OPERATOR
157,99
(6.22)
PT |
C2 |
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PS |
8,89 |
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(.35) |
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19,05 |
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53,09 |
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38,1 |
(2.09) |
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(.75) |
34,93 (1.50) |
55,37 |
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(2.18) |
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(1.375) |
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38,1 |
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(1.50) |
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76,2
(3.00)
99,06
(3.90)
1428B
Dimensions of the KVF in Millimeters (Inches).
BLN-95-9061-4
3