Danfoss KVS 15, KVS 42 Data sheet

Data sheet

Electric Regulating Valve
Type KVS

KVS is a series of electronic suction modulating
valves for AC transport and refrigeration
applications.

Accurate temperature or pressure control is
obtained by modulating the refrigerant flow in
the evaporator with a current or voltage driver.

With an EKC 368 controller (current driver) and
an AKS sensor placed in the media to be con­trolled, an accuracy better than ± 0.5K can be
obtained.

The balanced design provides bi-flow operation as
well as solenoid shut-off function in both flow
directions at MOPD 33 bar (478 psig).

Features • Biflow.

• High resolution for precise control.

• Wide range for all common refrigerants R22,
R134a, R404A, R407A, R407C, R407F, R422B,
R422D, R438A, R448A, R449A, R450A, R452A,
R507, R513A, R410A, R1234ze and other
refrigerants

• Balanced port design (KVS 42).

• Solenoid tight shut-off.

• Low power consumption.

• Corrosion resistant design external as well as
internal.

• Cable and connector assemblies as accessories.

• For manual operation and service of KVS valves
an AST-g service driver is available.
For further information please contact Danfoss
(Commercial Refrigeration & Air Conditioning
Controls).

© Danfoss | DCS (sw) | 2017.10

DKRCC.PD.VC1.C7.02 | 1

.

Data sheet | Electric regulating valve type KVS 15 – KVS 42

Technical data

Electrical data

Parameter KVS 15 KVS 42

R22, R134a, R404A, R407A, R407C,

Compatible refrigerants

Refrigerant oil All mineral and ester oils All mineral and ester oils
CE marking No Yes
MOPD 33 bar / 478.6 psig 33 bar / 478 psig
Max. working pressure 45.5 bar / 660 psig 34 bar / 493 psig
Inlet fluid temperature -40 to +65 °C / -40 to +149 °F -40 to +65 °C / -40 to +149 °F
Ambient temperature -40 to +60 °C / -40 to +140 °F -40 to +60 °C / -40 to +140 °F
Total stroke 13 mm / 0.5 inch 17.2 mm / 0.68 inch
Motor enclosure IP 67 IP 67

Material of Construction

Parameter KVS 15 and KVS 42
Stepper motor type Bi-polar - permanent magnet
Step mode 2 phase full step
Phase resistance 52 Ω ±10%
Phase inductance 85 mH

Holding current

Step angle

Nominal voltage Constant voltage drive: 12 V DC -4% – 15%, 150 steps/sec.
Phase current (Using chopper drive) 100 mA RMS -4% +15%,
Max. total power Voltage / current drive: 5.5 / 1.3 W (UL: NEC class 2)

Step rate

Total steps

Full travel time

Lifting height

Reference position Overdriving against the full close position
Electrical connection M12 connector

R407F, R422B, R422D, R438A,
R448A, R449A, R450A, R452A, R507,
R513A, R410A, R1234ze and other
refrigerants

Body and AST Encloser: Brass
Connector: Copper

Constant voltage drive: Depends on application.
Chopper drive: full current allowed (100% duty cycle)

7.5° (motor),

0.9° (lead screw),
Gearing ration 8.5:1. (38/13)2:1

Constant voltage drive: 150 steps/sec.
Chopper current drive: 0 – 300 steps/sec. 300 recommended

KVS 15: 2625 [+160 / -0] steps
KVS 42: 3810 [+160 / -0] steps

KVS 15: 17 / 8.5 sec. (voltage / current)
KVS 42: 25.4 / 12.7 sec. (voltage / current)

KVS 15: 13 mm / 0.5 inch
KVS 42: 17.2 mm / 0.68 in

R22, R134a, R404A, R407A, R407C,
R407F, R422B, R422D, R438A,
R448A, R449A, R450A, R452A, R507,
R513A, R410A, R1234ze and other
refrigerants

Body and AST Encloser: Brass
Connector: Copper

Flow curves

Compatible controller / driver EKC 368 / EKD 316 or EKD 316C

KVS 15 Capacity Curve

.

.

KVS 42 Capacity Curve

© Danfoss | DCS (sw) | 1017.10

DKRCC.PD.VC1.C7.02 | 2

Data sheet | Electric regulating valve type KVS 15 – KVS 42

Ordering

Accessories:
M12 Female Connector Cable

Spare parts

KVS valves in single pack

Rated capacity

Type

R22 R134a R404A/R507 ODF Code no.

kW TR kW TR kW TR mm in.

KVS 15 5.15 1.31 3.78 0.94 4.58 1.07

KVS 42 40.4 11 . 4 29.3 8.3 35.3 10.0

1

) Rated capacity is the valve capacity at evaporating temperature te = –10°C (14°F), condensing temperature tc = +25°C (77°F)

and pressure drop across valve ∆p = 0.2 bar (2.9 psig).

1)

Connections

single

pack

16 ⁄ 034G4252
22 ⁄ 034G4253
22 ⁄ 034G2858
28 1⁄ 034G2850
35 1⁄ 034G2851

- 1⁄ 034G2852

Actuator with integrated M12 connection

Items Description Quantity

[pcs]

34G179.10
Danfoss

Actuator with integrated M12 with Ceramic bearing
(incl. metal gasket) for KVS 15

Code no.

1 034G2088

34G179.10
Danfoss

Actuator with integrated M12 with ceramic bearing

1 034G2087

(incl. metal gasket) for KVS 42

Metal Gasket 1 034G2344

© Danfoss | DCS (sw) | 1017.10

DKRCC.PD.VC1.C7.02 | 3

34G211.10

Pr
C

Data sheet | Electric regulating valve type KVS 15 – KVS 42

Accessories:
M12 angle cable

M12 angle female connector is intended for use with a standard M12 male connector,
available on stepper motor valves.

This cable is designed to offer high flexibility and small outer diameters with tensile strength.
The angle way M12 cable consist of paired, twisted wires, which decreases mutual influence between
signals transmitted along the cable and reduces influence of external sources of interference. The
cables thus provides a higher degree of protection against lost steps compared to other cables.

Approvals

Specification

Ordering

Identification

RoHS

Jacket PVC - black

Cable outer sheath Oil - resistant

Water proof rating IP 67

Operating temperature range -40 – +80 °C

Wire type Twisted pair, cross section 20 AWG / 0.5 mm2

Cable outer diameter 7.0 mm

Minimum bending radius 10 x cable diameter

Cable combustibility / test Flame retardant / VW-1 / CSA FT - 1

M12 standard EN 61076-2-101

Reference standard UL style 2464 and DIN VDE 0812

LVD directive 73/23/EEC and 93/68/EEC

Cable Cable length (L) Insulation Packing format Code no.

PVC - black

2 m / 6.6 ft SR-PVC Single pack 034G7073

8 m / 26.2 ft SR-PVC Single pack 034G7074

oduct type

ode no

Connections

Dimensions

A2 black

A1 white

B1 red

B2 green

34G210.10

8 meters / 26.2 feet

Manufacturing date

Meters / Feets

Country

34G209.10

Ø 63 mm / 1/4 inch

35 mm / 1.4 inch2 meters / 6.6 feet
49 mm / 1.9 inch

© Danfoss | DCS (sw) | 1017.10

DKRCC.PD.VC1.C7.02 | 4

Danfoss

34G212.10

A

B

Data sheet | Electric regulating valve type KVS 15 – KVS 42

Design

Note:

Flow direction from A to B
refers the normal flow.

KVS 42

1. M12 Connector

2. Glass seal

3. AST motor housing

4. Stepper motor

5. Bearing

6. Spindle

7. Top nut

8. Valve piston

9. Valve seat

10. Valve cone

Danfoss

34G45.12.10

A

B

KVS 15

1. M12 connection

2. Glass seal

3. AST motor housing

4. Stepper motor

5. Bearing

6. Spindle

7. Cone and lead nut

8. Valve seat

Electrical wiring

Note:
Electrical check of
stepper motor and
wiring: coil I = 52 ohm
coil II = 52 ohm

© Danfoss | DCS (sw) | 1017.10

DKRCC.PD.VC1.C7.02 | 5

Data sheet | Electric regulating valve type KVS 15 – KVS 42

Stepper motor switch
sequence

Valve application

Coil I Coil II

Red Green White Black

↑ CLOSING ↑

STEP

1 + - + ­2 + - - +
3 - + - +
4 - + + ­1 + - + -

If the controller driving the KVS valve is from
another manufacturer than Danfoss or a custom
design, the following points must be considered
in order to overcome potential step loss.

a. To ensure total closing of the valve, the con­troller should have a function to overdrive the
valve in the closing direction. It is recommended
to overdrive ten percent of the full step range at
appropriate intervals.

↓ OPENING ↓

b. The amount of lost steps may increase as a
function of the amount of changes of the open­ing degree. Such designed controller should be
able to compensate the lost steps after a defined
number of changes in opening degree.

Warning:
At power failure the KVS valve will remain in the
opening position it has at the moment of power
failure, unless a safety device in the form of a bat­tery backup is installed.

Evaporator

Valve operation The KVS valves operate modulating by electroni-

cally controlled activation of the AST stepper
motor. The motor is a type 2-phase bipolar,
which stays in position, unless power pulses from
a driver initiate the two discrete sets of motor
stator windings for rotation in either directions.

The direction of the rotation of the spindle
depends on the phase relationship of the power
pulses. This is decisive for the travel of the piston.

The motor is operating the spindle, whose rotat­ing movements are transformed into linear
motion by the transmission in the cage assembly.
The AST motor housing has an integrated M12
connector.

The KVS 42 valves have a pressure slide port
respectively exponential cone, combining the
best performance qualities at part load condi­tions as well as providing a zero-resistance at
maximum capacity.
The piston design is fully power balanced, giving
identical bi-flow performance capabilities and
nearby identical maximum capacities.

Closing the valve by overdriving, ensures that the
reference number in steps is always correct.

Operating the KVS series requires a controller
with either 12 V dc voltage drive (5.5 W) or using
chopper drive (100 mA RMS).

Danfoss EKC 368 in an example of a qualified
controller.

Note:

Cable length between driver and actuator
exceeding 10 m (30 feet) can set off self-induc­tion with reduction in the transmitted power and
irregularity in the sequences as consequence.

This may result in loss of steps now and again or
more permanent inadequate power supply to
the step motor.

The driver circuit as well as the cable specifica­tions are part of this interference.

Please contact Danfoss for further information
and possible countermeasures.

© Danfoss | DCS (sw) | 1017.10

DKRCC.PD.VC1.C7.02 | 6

Data sheet | Electric regulating valve type KVS 15 – KVS 42

Coolselector2®

For easy and precise selection of valve, use Danfoss’ CoolSelector2® software. You can find the KVS
valves on the group, “Control and regulating valves”.
You can download it from http://coolselector.danfoss.com

Valve sizing For optimum performance, it is important to take

into consideration all system conditions and
requirements. Selection is also dependent on an
acceptable pressure drop across the valve.
The following information will be needed when
sizing a KVS valve:

Valve selection

Example

In valve selection it may be necessary to apply a
correction factor to the actual evaporator
capaity. This correction is required when system
conditions are different than table conditions.
Selection also depends on having an acceptable
pressure drop across the valve. The following
example illustrates correct sizing.

Step 1

Determine the correction factor for liquid tem­perature t

Correction factors for liquid temperature t

tl °C 10 15 20 25 30 35 40 45 50
R134 a 0.88 0.92 0.96 1.0 1.05 1.10 1.16 1.23 1.31
R22 0.90 0.93 0.96 1.0 1.05 1.10 1.13 1.18 1.24
R404A / R507 0.84 0.89 0.94 1.0 1.07 1.16 1.26 1.40 1.57
R407C 0.88 0.91 0.95 1.0 1.05 1.11 1.18 1.26 1.35

ahead of expansion valve.

l

l

• Refrigerant

• Evaporator capacity Qe in kW or TR

• Evaporating temperature te in °C or °F

• Liquid temperature ahead of expansion valve
tl in °C or °F

• Max. acceptable pressure drop in the KVS valve
in bar or psig

• Connection size

• Refrigerant: R 404A

• Evaporator capacity: Qe = 20 kW / 5.7 TR

• Evaporating temperature:
te = –10°C ~ 3.4 bar / 14°F ~ 49.3 psig

• Liquid temperature ahead of expansion valve:
t

= 25°C / 77°F

l

• Max. pressure drop in the valve:
∆p = 0.2 bar / 2.9 psig

• Connection type: Solder

• Connection size: 11/8 in.

From the correction factors table (see below) a
liquid temperature of 25°C / 100°F, R404A
corresponds to a factor of 1.0.

Step 2 Corrected evaporator capacity is

Qe = 20 × 1.0 = 20 kW / 5.7 × 1.0 = 5.7 TR

Step 3 Now select the appropriate capacity table,

R404A, and choose the column for an
evaporating temperature of te = –10°C / 14°F.

Using the corrected evaporator capacity, select a
valve that provides an equivalent or greater
capacity at an acceptable pressure drop across
the valve of 0.2 bar / 2.9 psig.

Rated Capacity (kW) SI units

t

e

Pressure drop ∆p [bar] Pressure drop ∆p [bar]

[°C] 0.05 0.1 0.2 0.3 0.5 0.7 0.05 0.1 0.2 0.3 0.5 0.7

10 3.30 4.65 6.52 7.93 10.1 11 .7 25.5 36.0 50.5 61.4 78.1 91.0

0 2.71 3.81 5.34 6.47 8 .18 9.46 21.0 29.6 41.4 50 .1 63.7 73.3

-10 2.20 3.09 4.30 5.19 6.49 7.4 3 17.0 23.9 33.3 40.2 50.3 57. 5

-20 1.75 2.45 3.39 4.06 5.00 5. 61 13. 6 19.0 26.3 31. 5 38.7 43.5

-30 1.37 1.91 2.60 3.08 3.67 3.97 10.6 14.8 20.2 23.9 28.5 30.8

-40 1.04 1.44 1.92 2.22 2.49 2.50 8.08 11.1 14.9 17. 2 19.3 19. 4

Step 4

R404A

KVS 42, 11/8 in.:

Single pack code no. 034G2850

KVS 42 delivers 33.32 kW / 9.5 TR at a 0.2 bar /

2.9 psig) pressure drop across the valve.

Based on the required connection size of 11/8 in,
the KVS 42 is the proper selection for this
example.

Rated capacity [kW]

KVS 15 KVS 42

© Danfoss | DCS (sw) | 1017.10

DKRCC.PD.VC1.C7.02 | 7

Data sheet | Electric regulating valve type KVS 15 – KVS 42

Correction factor table

tl °C 10 15 20 25 30 35 40 45 50
R134 a 0.88 0.92 0.96 1. 0 1.05 1.10 1.16 1. 23 1. 31
R22 0.90 0.93 0.96 1.0 1.05 1.10 1.13 1.18 1. 24
R404A / R507 0.84 0.89 0.94 1.0 1.07 1.16 1.26 1.40 1.57
R407C 0.88 0.91 0.95 1.0 1.0 5 1.11 1.18 1.26 1.35

SI units

Capacities

Rated Capacity (kW)

t

e

[°C]

0.05 0.1 0.2 0.3 0.5 0.7 0.05 0.1 0.2 0.3 0.5 0.7

10 2.94 4.12 5.73 6.91 8.62 9.84 22.75 31.92 44.43 53.54 66.82 76.28

R134a

R404A

R407C

R22

* The valves in the capacity table refer to the evaporator capacity and based on liquid temperature

* The conditions printed are the most common for the different refrigerants.

* The pressure drop across the valve is assumed to be the difference between evaporation pressure and suction pressure.

1

) The capacity of vapour flow will not increase for pressure drops above the critical pressure drop.

0 2.38 3.33 4.60 5.50 6.75 7.56 18.46 25.81 35.67 42.65 52.32 58.56

-10 1.90 2.64 3.61 4.26 5.07 5.46 14.72 20.47 27.96 33.00 39.27 42.29

-20 1.48 2.05 2.74 3.15 3.52 3.551) 11.50 15.85 21.20 24.42 27.30 27.47
10 3.30 4.65 6.52 7.93 10.08 11.74 25.54 35.99 50.53 61.43 78.11 91.00

0 2.71 3.81 5.34 6.47 8.18 9.46 21.01 29.56 41.37 50.14 63.35 73.30

-10 2.20 3.09 4.30 5.19 6.49 7.43 17.03 23.91 33.32 40.20 50.28 57.54

-20 1.75 2.45 3.39 4.06 5.00 5.61 13.58 19.00 26.29 31.47 38.72 43.47

-30 1.37 1.91 2.60 3.08 3.67 3.97 10.61 14.76 20.18 23.85 28.47 30.78

-40 1.04 1.44 1.92 2.22 2.49 2.501)
10 3.58 5.04 7.06 8.56 10.84 12.57 27.73 39.04 54.69 66.34 83.98 97.37

0 2.94 4.14 5.77 6.97 8.74 10.03 22.81 32.05 44.71 54.01 67.74 77.75

-10 2.39 3.34 4.63 5.55 6.86 7.74 18.48 25.88 35.87 43.03 53.14 59.94

-20 1.90 2.64 3.62 4.29 5.16 5.62 14.70 20.48 28.07 33.26 39.96 43.56
10 3.74 5.26 7.38 8.96 11.36 13.19 28.95 40.76 57.16 69.40 88.01 102.22

0 3.14 4.41 6.16 7.45 9.38 10.80 24.30 34.16 47.73 57.74 72.66 83.70

-10 2.60 3.64 5.06 6.09 7.57 8.60 20.12 28.21 39.21 47.17 58.63 66.60

-20 2.12 2.96 4.07 4.85 5.90 6.54 16.40 22.90 31.55 37.59 45.75 50.67

-30 1.69 2.35 3.18 3.73 4.36 4.57 13.10 18.18 24.68 28.92 33.79 35.44

-40 1.32 1.81 2.39 2.71 2.891) x1) 10.23 14.02 18.52 20.99 22.371) x1)

tl=30°C, superheat= sub cooling = 0 K.

Other conditions can be calculated with Danfoss calculation software CoolSelector®

KVS15 KVS 42

Pressure drop ∆p [bar] Pressure drop ∆p [bar]

8.08 11.14 14.91 17.20 19.26 19.391)

1)

© Danfoss | DCS (sw) | 1017.10

DKRCC.PD.VC1.C7.02 | 8

Data sheet | Electric regulating valve type KVS 15 – KVS 42

Correction factor table

tl °F 50 60 70 80 90 100 110 120
R134 a 0.79 0.82 0.86 0.90 0.95 1. 0 1.06 1.13
R22 0.82 0.85 0.88 0.92 0.96 1.0 1.05 1.10
R404A / R507 0.71 0.75 0.80 0.85 0.92 1. 0 1.10 1.24
R407C 0.78 0.81 0.85 0.89 0.94 1.0 1. 07 1.15

US units

Capacities

Rated Capacity (TR)

(TR) = ton of refrigerants

t

e

[°F]

0.7 1.5 3 5 7 10 0.7 1.5 3 5 7 10

50 0.86 1.25 1.73 2.19 2.53 2.91 6.65 9.66 13.44 16.96 19.60 22.58

R134a

R404A

R407C

* The valves in the capacity table refer to the evaporator capacity and based on liquid temperature

* The conditions printed are the most common for the different refrigerants.

* The pressure drop across the valve is assumed to be the difference between evaporation pressure and suction pressure.

1

) The capacity of vapour flow will not increase for pressure drops above the critical pressure drop.

30 0.68 0.98 1.36 1.69 1.93 2.17 5.28 7.63 10.53 13.12 14.96 16.83
10 0.53 0.76 1.03 1.26 1.40 1.49 4.10 5.88 7.99 9.74 10.82 11.58

-5 0.43 0.61 0.82 0.96 1.03 1.031) 3.34 4.74 6.32 7.46 7.95 8.011)

50 0.98 1.43 2.00 2.56 3.00 3.53 7.59 11.06 15.53 19.84 23.23 27.33
30 0.79 1.15 1.61 2.04 2.38 2.78 6.12 8.90 12.45 15.83 18.45 21.52
10 0.63 0.91 1.26 1.59 1.84 2.12 4.85 7.03 9.78 12.34 14.26 16.41

-5 0.52 0.75 1.04 1.29 1.48 1.67 4.01 5.81 8.02 10.03 11.47 12.97

-20 0.42 0.61 0.83 1.03 1.15 1.26 3.28 4.72 6.46 7.95 8.94 9.80

-40 0.32 0.45 0.60 0.71 0.76 0.771) 2.44 3.47 4.64 5.50 5.89 5.951)

50 1.05 1.53 2.14 2.72 3.18 3.72 8.12 11.82 16.55 21.09 24.62 28.81
30 0.84 1.23 1.71 2.16 2.50 2.90 6.54 9.50 13.24 16.75 19.40 22.44
10 0.67 0.96 1.33 1.67 1.91 2.16 5.17 7.47 10.33 12.91 14.77 16.71

-5 0.55 0.79 1.08 1.33 1.50 1.64 4.26 6.14 8.40 10.34 11.62 12.73

50 1.08 1.58 2.21 2.82 3.30 3.87 8.40 12.24 17.16 21.88 25.58 29.99
30 0.89 1.30 1.81 2.30 2.67 3.10 6.92 10.06 14.04 17.80 20.68 24.01
10 0.72 1.05 1.45 1.82 2.10 2.39 5.60 8.11 11.25 14.13 16.24 18.54

R22

-5 0.61 0.88 1.21 1.50 1.70 1.90 4.72 6.81 9.36 11.62 13.18 14.69

-20 0.51 0.73 0.99 1.20 1.33 1.42 3.92 5.62 7.64 9.30 10.31 10.99

-40 0.39 0.54 0.72 0.83 0.861) x1) 2.98 4.22 5.56 6.43 6.641) x1)

tl=86°F, superheat= sub cooling = 0 K.

Other conditions can be calculated with Danfoss calculation software CoolSelector®

KVS15 KVS 42

Pressure drop ∆p [psi] Pressure drop ∆p [psi]

© Danfoss | DCS (sw) | 1017.10

DKRCC.PD.VC1.C7.02 | 9

Dimensions and weights

KVS 15

Type

KVS 15

KVS 42

Type

KVS 42

Connections H

ODF x ODF (A x B)

[in] [mm]

5

/8 × 5/816 × 16

7

/8 × 7/822 × 22

Connections H

ODF x ODF (A x B)

[in] [mm]

7

/8 × 7/822 × 22 4.8 12 0 7. 4 188 .5 5.6 143 3.7 93 3.8 95.5 2.4 60 0.95 24 1.9 4.2

1

[in] [mm] [in] [mm] [in] [mm] [in] [mm] [in] [mm] [in] [mm] [in] [mm] [kg] [lb.]

1.2 30 0.5 13 2.5 64 5.9 159 2.4 60 2.4 60 2.4 60 0.7 1.5

1

[in] [mm] [in] [mm] [in] [mm] [in] [mm] [in] [mm] [in] [mm] [in] [mm] [kg] [lb.]

H

2

L

1

H

3

L

2

Danfoss
34G102.13

H

4

L

3

L

1

B

L

4

øD

L

2

øD

1

Weight

A

1

B

1

Weight

11/8 × 11/828 × 28 4.8 12 0 6.7 168.5 5.6 143.0 3.3 83.0 3.4 85.5 2.4 60 0.95 24 1.9 4.2

13/8 × 13/835 × 35 4.8 120 7. 0 178 .5 5.6 143.0 3.5 88.0 3.6 90.5 2.4 60 0.95 24 1.9 4.2

15/8 × 15/

- 4.8 120 7.4 188 .5 5.6 143.0 3.7 93.0 3.8 95.5 2.4 60 0.95 24 1.9 4.2

8

Related products

EKD 316 driver EKC 368 controller AKS 11 / AKS 12 temperature sensor

AKS pressure transmitter

© Danfoss | DCS (sw) | 2017.10

Code no. 034G0013

AST-G service driver

DKRCC.PD.VC1.C7.02 | 10