Pulse Motor Expansion Valves Type KV - Danfossfiles.danfoss.com/TechnicalInfo/Dila/01/USCO.PD.V1.A1.22.pdf · • Ideally suited for microcomputer control ... the flow per pulse has

REFRIGERATION AND AIR CONDITIONING

Pulse Motor Expansion ValvesType KV

TECHNICAL LEAFLET

2 USCO.PD.V1.A1.22 / 521U0082 © Danfoss Inc (USCO / mks), 1-2008

Technical leaflet Pulse Motor Expansion Valves, Type KV

Introduction .....................................................................................................................................................................................3

Features ..............................................................................................................................................................................................3

Explanation of Action ...................................................................................................................................................................4

Operation Principles ..................................................................................................................................................................4-5

Common Refrigerant Valve and Coil Specifications...........................................................................................................6

Application Examples ...................................................................................................................................................................7

Selection Method .......................................................................................................................................................................8-9

Capacity R410A ............................................................................................................................................................................ 10

CO2 Applications .......................................................................................................................................................................... 11

Dimensions .................................................................................................................................................................................... 12

Contents Page

© Danfoss Inc (USCO / mks), 1-2008 USCO.PD.V1.A1.22 / 521U0082 3


Wide selection for refrigeration and air •conditioning applicationsCompatible with various refrigerants: •R-410A, R-407C, R-134a, R-404A, R-22 Stepper motor drive provides high-precision •flow controlA range of full closing valve types is available •that generally require no solenoid valveHigh resolution: 480 steps from fully closed •to fully open

Introduction As environmental consciousness is being raised and global warming concerns are bringing ever more stringent regulations, the demand is quickly growing for energy-saving cooling and heating devices in household and commercial applications, including cold storage warehouses and, rapid freezing devices.

The KV series of stepper motor expansion valves have been solidly respected in Japanese markets since 1982. Danfoss Saginomiya offers KV series pulse motor expansion valves for numerous applications. KV reliability has been extensively field proven.

Features Compact and lightweight design•Power-saving design requires no energy for •stopping.Ideally suited for microcomputer control•Unipolar drive system (for bipolar drive, please •contact us)Bi-flow design for heat pump applications•UKV, SKV, VKV, AKV: UL recognized•

2007.10.18

4800 Pulse

FlowMax

4800 Pulse

FlowMax

4800 Pulse

FlowMax

a b c

KV valves have excellent flow characteristics, including high resolution at low load. •In KV valves that have an inflected flow characteristic as shown in (a) and (c), the flow per pulse has one rate for low flow and a higher rate for greater flow. With these valves, fine control can be accomplished with a low load (low flow). Full closing KV valves having a flow characteristic (b), (c) are available with inflected flow characteristic or continuous flow characteristic, the latter having very nearly the same change in flow rate per pulse.

Long valve lift range results in a wider range of controllable capacity•

As can be seen in the diagram above, pulse motor expansion valves have a much greater range than mechanical valves.

2007.10.18

VPX-3415BPC2.62

PKV-18BS

Capa

city

(U.S

.R.T

)

0

3

VPX-3408BPC1.40

VPX-3405BPC0.87

VPX-3403BPC0.52

Our mechanical expansion valves

Our pulse motorexpansion valves

(capacity ..... R407C)

3.0



In operation of the KV valve, the magnet-needle valve assembly is rotated by the stepper motor (principle described in next paragraph) and by means of a screw structure has linear motion, opening and closing to regulate refrigerant flow. This simple structure results in compact products.

2007.10.10

Sectional diagram of KV series

B

A

Magnet

Coil Male screw

Female screw

Needle valve

Body

Fluid direction

Explanation of Action

Figs.1-1 and 1-2 show a vertical cross section of the coils (upper coil (A and A) and lower coil (B and B). Each coil comprises a clockwise winding A, B and a counterclockwise winding A, B. Each coil has 3 terminals. Fig.1-3 shows the arangement of the stators that surround the armature. The polarities of the magnetic poles change depending on the direction of current flow.

Operation Principle I

2007.10.10

KV_Z_6

Operation principle

Lower coil

Stator

Upper coil Housing

SS

NN

COM

COM

A

A

B

B

A Phase A,B Phase A,B PhaseB Phase

Upper coil

Lower coil

ＳＮＳＮ

ＮＳＮＳ

ＳＮ

ＳＮ

Fig.1-1

Fig.1-2

Fig.1-3

Connector No. ONOFF1 A Phase

2 B PhaseA PhaseB Phase

345 COM.(＋）

Fig.1-4　Excitation sequence (1-2 phase excitation)

Valve operation Valve opens Valve is closed



This section explains the rotation of the permanent magnet rotor. The rotor has 24 poles, but the following explanation is simplified by dealing with only 4 of the poles.Fig.2-1 shows a vertical cross section through the stator. It shows the positional relation of the stator magnetic poles with the horizontal sectional diagram in Fig.2-2. In Fig.2-1, j shows the upper teeth of phase A, k shows the lower teeth of phase A, l shows the upper teeth of phase B, and m shows the lower teeth of phase B.

Assume that a current flows to phase A as a pulse. The polarities in Fig. (I) are generated in the stator to stabilize the rotor with an arrow facing upward. When feeding a current to phase AB by sending a pulse, the polarities are as shown in Fig. (II) causing the rotor to turn 22.5 degrees. When a subsequent current pulse is sent to phase B, the polarities are as shown in Fig. (III) causing the rotor to turn a further 22.5 degrees. By feeding pulses sequentially, one cycle is composed of 8 pulses, and the rotor rotates 180 grees in this figure. (A KV valve, remember, actually has 24 poles, so that the rotor rotates one sixth as far as in our example, or 30 degrees with every cycle. )

2007.10.10

KV_Z_7

Fig.2-1

A PhaseUpper tooth

Lower tooth

B PhaseUpper tooth

Lower tooth

N

N NS

N

S S

A Phase

S

N

N

S S

S

S

N

N

AB Phase

NN

S

SS

S

N

N

AB Phase

S

S

N NN

NSS

N

N

S

S

AB Phase

N

N

S SS

NN

S

NS

N

N

N

S

S

B Phase

S

S

S

N N

AB Phase

N

N

S

S

SS

N

N

S

NS

N

S

N N

A Phase

S

N

NS

S

S

N

N

B Phase

S

Fig.2-2

Operation Principle II



Valve Specifications

Coil Specifications

0.31 OD 0.31 OD0 to 3.5 0 to 507

0.28

0.23

0.18

2.4 348 or less

1.0 145 or less

VKV–25D

0 to 2.5 0 to 3621.5 217 or less

0.37 OD 0.50 OD

0.63 OD 0.63 OD 0 to 2.5 0 to 362 0.7 101 or less

2.2 319 or less

2.8 406 or less

1.5 217 or less

2.2 319 or less

3/8" 0 to 2.3 0 to 333

0 to 2.8 0 to 406

0.5

0.8

0.3

PKV-24BS 0.09

0 to 2.2 0 to 319 0.71/2"(Flare)5.0 17.5 3.9 13.7 3.5 12.3 5.1 18.0

PKV-14BS 0.06 1.5 5.2 1.1 4.0 1.0 3.6 1.5 5.3 1.7 6.1

2.9 10.3PKV-18BS 0.07 2.3 8.1 2.1 7.3 3.0 10.6 3.4 12.1

5.9 20.6

5.3 18.5 4.1 14.5 3.7 13.1 5.4 19.0 6.2 21.8

PKV-30BS 0.12 7.9 27.8 6.2 21.7 5.6 19.6 8.1 28.5 9.3 32.7

Catalog No.PortSize

( inch)

Capacity(U.S.R.T.) kW

Connection (Solder)(inch)

Operating PressureDifferential, B to A

(MPa) psi

Wt.(kg)

R22 R134a R407C R410A B side A side

0.31 OD 0.31 OD

0.25 OD 0.25 OD

0.31 OD 0.31 OD

0 to 3.5 0 to 507

0 to 3.5 0 to 507

Valve shut press.on, A to B

flow directionflow direction(MPa) psiR404A

2.5 362 or less

2.4 348 or less

Capacity: Based on CT=38°C[100˚F], ET=5°C[41˚F], SC=0°C[0˚K] and SH=0°C[0˚K]

(Flare)

3/8"(Flare)

*1

*1 Refer to the following fig. *2 Weight includes a coil.

*1*1 *2

2.3 8.2 1.8 6.4 2.4 8.5 2.8 9.7SKV–16D 1.7 5.80.06

SKV–18D 2.9 10.3 2.3 8.1 3.0 10.6 3.4 12.12.1 7.30.07

2.9 10.3 2.3 8.1 2.1 7.3 3.0 10.6 3.4 12.1UKV–18D 0.07

VKV–20D 2.5 8.73.5 12.4 2.7 9.7 3.6 12.7 4.1 14.50.08

0.09

VKV–30D 7.0 24.7 5.5 19.3 5.0 17.4 7.2 25.4 8.3 29.10.12

5.6 19.6 4.4 15.3 3.9 13.8 5.7 20.1 6.5 23.0UKV–25D 0.09

7.6 26.8 6.0 20.9 5.4 18.9 7.8 27.5 9.0 31.5UKV–30D 0.12

VKV–32D 5.8 20.38.2 28.8 6.4 22.5 8.4 29.6 9.6 33.90.125

AKV–55D 27.9 98.116.7 58.80.22 23.7 83.4 18.5 65.2 24.4 85.6

Maximum working pressure: 609 psi (4.2 MPa) Ambient temperature: -22 to 140oF (-30 to 60oC) Type PKV: -58 to 140oF (-50 to 60oC)Fluid Temperature: -22 to 248oF (-30 to 12oC) Type AKV: -22 to 266oF (-30 to 130oC) Type PKV: -58 to 140oF (-50 to 60oC)Ambient humidity 95% RH or less

Modulation: Permanent magnet type direct operating stepper motorExcitation method: 1-2 phaseExcitation speed: 31.3 pps +10% Operating range: 0 to 480 pulsesIntialization: Phase A COM (+)

Common Refrigerant ModelsSpecifications

Motor and Drive Specifications

0.38A / Phase

AKV

0.26A / Phase Current (at 20˚C[68˚F])12V DC ±10%Rated voltage

UKV,SKV,VKV,PKVType

32 ± 3 Ω (at 20˚C[68˚F])

46 ± 3 Ω(at 20˚C[68˚F])

Direct current resistance

IP66Enclosure

Class E MoldedInsulation class

115˚C[239˚F] or less by rated voltage, temperature - resistance method. Max. coil temperature

B Side Conn.

A Side Conn.

*1

B to A flow direction

A to B flow direction



Comp.

Remote ControllerMain PC Board

Anti Freeze Heater

Pulse Motor Expansion ValveKV series

4-WayReversing Valve

Type STF

Pressure SensorType XSK

High Pressure ControlsType HNS

Aircoil TemperatureSensor

Type TEK

Inlet Temperature SensorType TEK

Outlet Temperature SensorType TEK

Flow SwitchType FQS

Comp.

Cooling

Indoor UnitOutdoor Unit

Controller

Accumulator

Pressure SensorType NSK

4-way reversingvalve

Type STF

Pulse Motor Expansion ValveKV series

Application Examples Multi-type heat pump unit

Chiller unit



Aimed refrigerating temperature: - 40oFKind of refrigerant used: R407C

Operating conditions of unit

Just after starting operation Just after terminating operation

Condensing temp (CT)

104oF 104oF

Sub cool (SC) 54oF 72oF

Evaporating temp (ET)

-22oF -58oF

Required capacity26.5kW

(with the maximum load)15.6kW

If the operating conditions of the unit are known, a KV valve can be selected easily according to the capacity – valve opening graph given on the next page.

Let’s select an optimum pulse motor expansion valve for the operating conditions shown at the bottom of this page.1) Calculate the required maximum refrigerating capacity of the unit (normally, the capacity just after starting).Enter the R-407C correction factor table in the row for evaporating temperature (-22˚F) and condensing temperature (72˚F) , and in the column for the subcool temperature (54˚F) , and at their intersection find the correction factor (1.39). Then calculate the required maximum capacity (19.1kW) of the unit by dividing the refrigerating capacity (26.5kW) by the correction factor.2) Calculate the required minimum refrigerating capacity of the unit (normally, the capacity just after stopping operation). Enter the table in the row for the evaporating temperature (-58˚F) and condensing temperature (104˚F) , and in the column for the subcool temperature (72˚F) , and at their intersection find the correction factor (1.47). Then calculate the required minimum capacity (10.6kW) of the unit by dividing the refrigerating capacity (15.6kW) by the correction factor.3) Selection of pulse motor expansion valvesPulse motor expansion valves PKV-30BS and PKV-24BS can have refrigerating capacity larger than the required maximum capacity of the unit at maximum opening 480 pulses. When comparing the valve opening width between the maximum load and the minimum load with each other, it is 80 pulses in PKV-30BS and 200 pulses in PKV-24BS. Select PKV-24BS in this case because the valve opening width between the maximum load and minimum load is wider (high resolution).

Selection Method



PKV-14BS

PKV-18BS

PKV-24BS

PKV-30BS

0.0

5.0[1.42]

10.0[2.84]

15.0[4.27]

20.0[5.69]

25.0[7.11]

30.0[8.53]

kW[U.S.R.T]

0 50 100 150 250 300 350 400 450200

R407C Correction factor tableSuperheat=9˚F

Sub cool[˚F][˚F] [˚F] 0 18 36 54 72 90 108

-58 0.88 1.04 1.20 1.35 1.51 1.66 1.810.90 1.05 1.20 1.35 1.49 1.63 1.770.92 1.06 1.20 1.33 1.47 1.60 1.730.93 1.06 1.19 1.31 1.44 1.57 1.690.93 1.05 1.17 1.29 1.41 1.52 1.64

-40 0.92 1.08 1.24 1.39 1.55 1.70 1.850.94 1.09 1.24 1.38 1.53 1.67 1.810.95 1.09 1.23 1.37 1.50 1.63 1.760.96 1.09 1.22 1.34 1.47 1.59 1.710.96 1.08 1.20 1.31 1.43 1.54 1.66

-22 0.95 1.11 1.27 1.43 1.58 1.73 1.880.97 1.12 1.27 1.41 1.55 1.69 1.830.98 1.12 1.25 1.39 1.52 1.65 1.780.98 1.11 1.24 1.36 1.48 1.60 1.730.97 1.09 1.21 1.32 1.44 1.55 -

-13 0.97 1.13 1.28 1.44 1.59 1.74 1.890.98 1.13 1.28 1.42 1.56 1.70 1.840.99 1.13 1.26 1.39 1.53 1.66 1.790.99 1.12 1.24 1.36 1.48 1.61 -0.98 1.09 1.21 1.32 1.44 1.55 -

-4

122

0.98 1.14 1.29 1.45 1.60 1.74 1.89

113

0.99 1.14 1.28 1.43 1.56 1.70 1.84

104

1.00 1.13 1.27 1.40 1.53 1.66 -

95

0.99 1.12 1.24 1.36 1.48 1.60 - 86

122113104 95

86

122113104 95

86

122113104 95

86

122113104 95 86

0.98 1.09 1.21 1.32 1.43 - -

Pulse

[PKV]

19.1

10.6

Refrigerant : R407CEvaporating temp : 5˚FCondensing temp : 104˚FSub cool : 0˚FSuperheat : 9˚F

Capacity – valve opening graph

Evaporating temp.

Condensingtemp.

Selection Method, continued



[˚F] [˚F] 0 18 36 54 72 90 108-76

122

0.87 1.06 1.23 1.40 1.57 1.73 1.89

113

0.91 1.08 1.24 1.40 1.56 1.71 1.86

104

0.94 1.09 1.24 1.39 1.54 1.68 1.820.95 1.10 1.24 1.37 1.51 1.64 1.77

86

95

122113104 95

86

122113104

86

95

122113104 95

86

122113104

95 86

122113104

95 86

122113104

95 86

122113104

95 86

122113104

95 86

122113104

86

95

122113104 95

86

0.96 1.09 1.22 1.35 1.48 1.60 1.72-58 0.91 1.09 1.27 1.44 1.60 1.77 1.93

0.94 1.11 1.27 1.43 1.59 1.74 1.890.97 1.12 1.27 1.42 1.56 1.70 1.840.98 1.12 1.26 1.40 1.53 1.66 1.790.98 1.11 1.24 1.37 1.49 1.62 1.74

-40 0.93 1.12 1.29 1.46 1.63 1.79 1.950.97 1.14 1.30 1.45 1.61 1.76 1.910.99 1.14 1.29 1.44 1.58 1.72 1.861.00 1.14 1.28 1.41 1.54 1.67 1.801.00 1.13 1.25 1.38 1.50 1.62 1.74

-22 0.96 1.14 1.31 1.48 1.64 1.80 1.960.98 1.15 1.31 1.46 1.61 1.76 1.911.00 1.15 1.30 1.44 1.58 1.72 1.851.00 1.14 1.28 1.41 1.54 1.67 1.791.00 1.12 1.25 1.37 1.49 1.61 -

-13 0.96 1.14 1.31 1.48 1.64 1.80 1.950.99 1.15 1.31 1.46 1.61 1.76 1.901.00 1.15 1.29 1.44 1.57 1.71 1.841.00 1.14 1.27 1.40 1.53 1.65 -0.99 1.12 1.24 1.36 1.48 1.59 -

-4 0.96 1.14 1.31 1.48 1.64 1.79 1.950.99 1.15 1.31 1.46 1.60 1.75 1.891.00 1.15 1.29 1.43 1.56 1.70 -1.00 1.13 1.26 1.39 1.51 1.64 -0.98 1.10 1.22 1.34 1.46 - -

5 0.96 1.14 1.31 1.47 1.63 1.78 1.930.98 1.14 1.30 1.45 1.59 1.73 -0.99 1.14 1.28 1.41 1.55 1.68 -0.98 1.12 1.24 1.37 1.49 - -0.97 1.09 1.20 1.32 1.43 - -0.96 1.14 1.30 1.46 1.61 1.77 -0.98 1.13 1.28 1.43 1.57 1.71 -0.98 1.12 1.26 1.39 1.52 - -0.97 1.10 1.22 1.34 1.46 - -0.94 1.06 1.17 1.28 - - -0.95 1.12 1.29 1.44 1.59 1.74 -0.96 1.12 1.26 1.41 1.55 - -0.96 1.10 1.23 1.36 1.49 - -0.94 1.07 1.19 1.31 - - -0.92 1.03 1.13 1.24 - - -

32

23

0.94 1.11 1.27 1.42 1.57 - -0.95 1.10 1.24 1.38 1.51 - -0.94 1.07 1.20 1.32 - - -0.91 1.03 1.15 1.26 - - -0.88 0.98 1.09 - - - -

41 0.92 1.08 1.24 1.38 1.53 - -0.92 1.07 1.20 1.34 - - -0.91 1.03 1.16 1.28 - - -0.87 0.99 1.10 - - - -0.83 0.93 1.02 - - - -

0.0

10.0(2.84)

20.0(5.69)

30.0(8.53)

[kW]([U.S.R.T])

0 50 100 150 200 250 300 350 400 450[Pulse]

SKV-16D46

SKV-18D49

VKV-20D32

VKV-25D34

VKV-30D36

VKV-32D38

Refrigerant : R410AEvaporating temp. : -13˚FCondensing temp. : 104˚FSub cool : 0˚FSuperheat : 9˚F

R410A Correction factor tableSuperheat=9˚F

Sub cool[˚F]Evaporating temp.

Condensingtemp.

14

Capacity - R410A



Maximum working pressure: 2175 psi (15 MPa) Ambient temperature: -22 to 158oF (-30 to 70oC) Fluid temperature: -22 to 148oF (-30 to 70oC)Ambient humidity 95% RH or less

Modulation: Permanent magnet type direct operating stepper motorExcitation method: 1-2 phaseExcitation speed: 31.3 pps +10% Operating range: 0 to 480 pulsesIntialization: Phase A COM (+)

CO2 Application Specifications

Motor and Drive Specifications

0.18

Catalog No.PortSize

( inch)

CapacitykW U.S.R.T.

Connection (Solder)(inch)

Operating PressureDifferential, B to A

psi MPa

Wt.(kg)

R744 B side A side

0.25 OD 0.25 OD 0 to 1450 0 to 10

Valve shut press.on, A to B

flow directionflow direction(MPa) psi

Capacity: Based on inlet temp.=100°F[38˚C], ET=41°F[5˚F],inlet pressure=1378psi[9.5MPa] andSH=0°K[0°C]

*1

*1*1 *2

5.951.69UKV–J14D 0.06

UKV-J

0.26A / Phase Current (at 68˚F[20˚C])12V DC ±10%Rated voltage

Type

46 ± 3 Ω(at 68˚F[20˚C])

Direct current resistance

IP66Enclosure

Class E MoldedInsulation class

239˚F[115˚C] or less by rated voltage, temperature - resistance method. Max. coil temperature

Valve Specifications

Coil Specifications

B Side Conn.

A Side Conn.

*1

*1 Refer to the following fig. *2 Weight includes a coil.

B to A flow direction

A to B flow direction

Hot water storage unit side

Relief valveType VSV/WSV

Pressure reducing valveType CRV

Hydrothermal exchanger

Air heatexchanger

Tank

Comp.

DefrostSolenoid valve

Pressure control

Type CCBType HPV

Motorizedcontrol valve

Type UKV-J

Heat pump unit side

Mixing valve

WaterSupply

Hot Water Supply

Pump

Hot water irrigation

Waterirrigation

Application ExamplesCO2 Hot Water Supply Unit



DimensionsUnit: inch[mm]

1.50[38]

1.89[ 48]

[ 7.94±0.1 t=0.8] 0.31±0.004 t=0.031

1.39

±0.

08[4

9±2]

4.06

±0.

12[1

03±

2]7.94

±0.

1 t=

0.8

2.44±0.08[62±2]

Conn.

Conn.A Side

B Side

0.

31±

0.00

4

t=

0.03

1

Type SKV

[ 1

5.88

±0.1

5 t=

1.2]

Conn.

[( 67)]( 2.64)

(2.5

8)[(6

5.5)

]

(2.54)[(64.5)](5

.91)

[(150

)]

Conn.

A side

B side

[ 15.88±0.15 t=1.2] 0.63±0.006 t=0.047

0.

63±0

.006

t=0.

047

Type AKV

1.46 [37]

1.89

Conn.

2.52±0.08[64±2]

1.93

±0.0

8[49

±2]

4.41

±0.1

2[11

2±3]

Conn.B side

A side

[ 48]

[ 7

.94±

0.1

t=0.

8]

0.

31±0

.004

t=0.

031

[ 7.94±0.1 t=0.8]

0.31±0.004 t=0.031

Type VKV-20D to 30D Type VKV-32D

1.46[37]

1.89

Conn.

2.60±0.08[66±2]

2.52

±0.0

8[64

±2]

5.12

±0.1

2[13

0±3]Conn.

[ 12.7±0.15 t=0.8]

[ 9

.52±

0.15

t=0.

8]

[ 48]

A side

B side

0.5±0.006 t=0.031

0.37

±0.0

06 t

=0.0

31

Inlet

Flow direction

Outlet

1.18[30]0.71[85]

( 2.17)[( 55)]

(3.6

2)[(9

2)]

19.6

9[50

0]

5/8 - 18UNF 5/8 - 18UNF

Type PKV-14BS to 24BS Type PKV-30BS

Inlet

Flow direction

M14×1

Outlet

1.42 [ 36]

( 2.17)[( 55)]

(4.1

3)[(1

05)]

19.6

9[50

0]

3.82[97]

5/8 - 18UNF 3/4 - 16UNF

0.25

0±0.

039

t=

0.04

7

1.54 [39]

1.85±0.079[47±2]

Conn.

Conn.

B side

A side

1.97

±0.0

79[5

0±2]

(3.9

0)[(9

9)]

[6.35±0.1 t=1.2]

[6.3

5±0.

1 t=

1.2]

1.28[32.5]

0.250±0.039 t=0.047

Type UKV Type UKV-J

Danfoss, Refrigeration & Air-Conditioning Division, 7941 Corporate Drive, Baltimore, MD 21236 Tel. 410-931-8250, Fax 410-931-8256, www.danfoss.us

1.97

±0.0

79[5

0±2]

(3.8

8)[(9

8.6)

]

1.85±0.079[47±2]

A

B

(1.85)[(47)]

Conn.

Conn. Catalog No. A B

UKV–18D 0.250±0.039 t=0.028[ 6.35±0.1 t=0.7]

UKV–30D

UKV–25D

(1.6

9)[(4

3)]

(1.2

6)[(3

2)]

B side

A side

[ 7.94±0.1 t=0.8]0.313±0.039 t=0.031

1.97

±0.0

79[5

0±2]

(3.8

8)[(9

8.6)

]

1.85±0.079[47±2]

A

B

(1.85)[(47)]

Conn.

Conn. Catalog No. A B

UKV–18D 0.250±0.039 t=0.028[ 6.35±0.1 t=0.7]

UKV–30D

UKV–25D

(1.6

9)[(4

3)]

(1.2

6)[(3

2)]

B side

A side

[ 7.94±0.1 t=0.8]0.313±0.039 t=0.031

Documents

Pulse Motor Expansion Valves Type KV - Danfossfiles.danfoss.com/TechnicalInfo/Dila/01/USCO.PD.V1.A1.22.pdf · • Ideally suited for microcomputer control ... the flow per pulse has