Danfoss KVF Installation guide

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

Self-containedpressurefeedback,eliminatesrequirement

Units available in standard line-to-line or overlapped

for feedback spring and ball for spool position

configuration in all flows from 1 1/4 gpm to 20 gpm at no

ISO 4406 filtration rating of 18/15 (Nominal 10 micron

additional cost

filtering provides dependable performance)

Installation dimensions common to all servovalves

Standard manual operator assists with operation and

Pricing is independent of flow capability

system diagnostics

Four connector option: MS, 2-pin WP, 4-pin WP, or 2-2

Requires low power dc current to drive rated flow;

pin WP

±20 mA, ±40 mA, ±100 mA, ±150 mA, or ±220 mA, are

Easily connected for unidirectional use from 2 1/2 gpm to

standard options. The ±20 mA, can be driven directly

from PLC.

35 gpm at 1000 psi rating

Does not require PWM drive for dither but is directly

Adaption maniflods available for conversion to other

compatible with other drives

valve patterns

4 to 20 mA version is configured such that 4 mA = 0 flow

Dual spool design provides added safety shut down if

and 20 mA = maximum flow

contamination causes failure of either spool

Unique two spool main body design allows for factory

Capability of separating control source from main stage

adjustment of null pressures at each working port

supply to accommodate high back pressure applications

ORDERING INFORMATION

KVF

X X X X X

Ordering specifications for standard models.

Device Identity

DEVICE IDENTITY

The modle code for this device is KVF.

Rev

MODEL CODE

SUPPLY PRESSURE

Supply Pressure

A

500 to 3000 psi

C

200 to 1000 psi

Flow Rating

D

500 to 3000 psi with separate pilot drain

% Lap Split

E

2500 to 3000 psi

F

500 to 3000 psi w/o cylinder port orifices

Pilot Stage

G

500 to 3000 psi w/o cylinder port orifices

and with pilot drain

© Danfoss, 2013-09

BLN-95-9076-2

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ORDERING INFORMATION (continued)

FLOW RATING

MODEL CODE	FLOW RATING
1	1.25 gpm
2	2.5 gpm
5	5 gpm
6	10 gpm
7	15 gpm
8	20 gpm
9	20 gpm with 300 lb/in springs

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
01 *		MCV116A3102		±150 mA		23 ohms	Packard	1.15 psid/mA
02 *		MCV116A3101		±150 mA		23 ohms	MS	1.15 psid/mA
03 *		MCV116A3204		±220 mA		16/19 ohms	Packard	0.78 psid/mA
05 *		MCV116A1307		±40 mA		69 ohms	MS	4.2 psid/mA
06		MCV116A1407		±40 mA		106 ohms	MS	5.5 psid/mA
07		MCV116A1402		±40 mA		106 ohms	Packard	5.5 psid/mA
08 *		MCV116A1302		±40 mA		69 ohms	Packard	4.2 psid/mA
09		MCV116A1501		±20 mA		643 ohms	MS	12.6 psid/mA
10 *		MCV116A3203		±220 mA		16/19 ohms	Packard (2)	0.78 psid/mA
14		MCV116A1101		±100 mA		23 ohms	MS	2.4 psid/mA
15		MCV116A3201		±220 mA		16/19 ohms	MS	0.78 psid/mA
16		MCV116A1203		±160 mA		16/19 ohms	Packard (2)	1.47 psid/mA
17		MCV116A1201		±160 mA		16/19 ohms	MS	1.47 psid/mA
18		MCV116A1102		±100 mA		23 ohms	Packard	2.4 psid/mA
19		MCV116A1502		±20 mA		643 ohms	Packard	12.6 psid/mA
20		MCV116A3214		±220 mA		16/19 ohms	Deutsch	0.78 psid/mA
21		MCV116A3100		±150 mA		23 ohms	No connector	1.15 psid/mA
22		MCV116J1407			Special, contact Danfoss
23		MCV116A1214		±160 mA		16/19 ohms	Deutsch	1.47 psid/mA
24		MCV116A1315		±40 mA		69 ohms	No connector	4.1 psid/mA
25		MCV116A1216		±160 mA		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		contact Danfoss
	Paper mill machinery
Asphalt pavers	Injection molding machinery
Saw setworks positioners	Platform leveling
Concrete pavers	Edge guide control machinery
Manipulator arms / industrial robots	Product testing machinery
Milling machines	Marine deck machinery
Soil stabilizers	Rocket motor testing equipment
Material mixing machinery	Oil exploration equipment
Synchronized knife carriage servodrives

BLN-95-9061-4

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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
	away from the closed nozzle to an equilibrium position
• Armature/flapper rotates about torsion pivot	producing a steady-state control pressure (PC1 or PC2)
	on the ends of each valve spool
• Flapper repositions towards one nozzle, which creates a
differential pressure between P1 and P2	• Each valve spool stops at a position where the control
	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
output (C1 or C2) to return (PT) on the other spool	• Therefore, valve spool position is proportional to input
	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
• Control pressure (PC1 or PC2) reflected to the flapper
produces torque on the flapper in opposition to the
magnetic torque on the armature
DIMENSIONS

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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

			11,43
.312 DIA			(.45)
.566 O.D.								C1
O-RING
(4-PL)

MANUAL OPERATOR

157,99

(6.22)

PT	C2
PS		8,89
		(.35)
	19,05		53,09
		38,1	(2.09)
	(.75)	34,93 (1.50)	55,37
			(2.18)
		(1.375)
38,1
(1.50)

76,2

(3.00)

99,06

(3.90)

1428B

Dimensions of the KVF in Millimeters (Inches).

BLN-95-9061-4

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