Danfoss Electronics KVP Data Sheet

Data sheet

Evaporator pressure regulator Type KVP

The KVP is mounted in the suction line after the evaporator and is used to:

1. Maintain a constant evaporating pressure and thereby a constant surface temperature on the evaporator. The regulation is modulating. By throttling in the suction line, the amount of refrigerant gas is matched to the evaporator load.

2. Protect against an evaporating pressure that is too low (e.g. as protection against freezing in a water chiller). The regulator closes when the pressure in the evaporator falls below the set value.

3. Diﬀerentiate between the evaporating pressures in two or more evaporators in systems with one compressor.

Features • Accurate, adjustable pressure regulation

• Wide capacity and operating range

• Pulsation damping design

• Stainless steel bellows

• Compact angle design for easy installation in any position

• “Hermetic” brazed construction

• 1⁄4 in. Schrader valve for pressure testing

• Available with ﬂare and ODF solder connections

• KVP 12 – KVL 22: may be used in the following EX range: Category 3 (Zone 2)

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Data sheet | Evaporator pressure regulator, type KVP

Approvals

Technical data

UL LISTED, ﬁle SA7200

R22, R1270*, R134a, R290*, R404A, R407A, R407C, R407F, R448A, R4 49A,

Refrigerants

Regulating range

Maximum working pressure PS/MWP PS = 18 bar

Maximum test pressure Pe = PS × 1.1 = 19.8 bar

Medium temperature range -45 – 130 °C

Maximum P-band

Kv-value 1) with oﬀset 0.6 bar

Kv-value 1) with maximum P-band

) The Kv value is the ﬂow of water in [m3 / h] at a pressure drop across valve of 1 bar, ρ = 1000 kg / m3.

This product (KVP 12 – KVP 22) is evaluated for R290, R600, R600a and R1270 by ignition source assessment in accordance with standard EN13463 -1.

R450A, R452A, R507A, R513A, R600*, R600a* * KVP 12 – KVP 22 only

0 – 5.5 bar

Factory setting = 2 bar

KVP 12 – 22: 1.7 bar

KVP 28 – 35: 2.8 bar

KVP 12 – 22: 1.7 m3 / h

KVP 28 – 35: 2.8 m3 / h

KVP 12 – 22: 2.5 m3 / h

KVP 28 – 35: 8.0 m3 / h

For complete list of approved refrigerants, visit www.products.danfoss.com and search for individual code numbers, where refrigerants are listed as part of technical data.

Ordering

REACH requirements

Rated capacity 1)

Type

KVP 12

KVP 15 4.0 2.8 3.6 3.7

KVP 22 4.0 2.8 3.6 3.7 – – –

KVP 28

KVP 35 8.6 6.1 7.7 7.9 – – – 1 3⁄8 35 034L0032

) Rated capacity is the regulator capacity at evaporating temperature te = -10 °C condensing temperature tc = 25 °C pressure drop in regulator Δp = 0.2 bar oﬀset = 0.6 bar To select the product for other conditions or refrigerants, use Danfoss Coolselector®2.

) KVP supplied without ﬂare nuts. Separate ﬂare nuts can be supplied: 1⁄2 in / 12 mm, code no. 011L1103 5⁄8 in / 16 mm, code no. 011L1167

R22 R134a

4.0 2.8 3.6 3.7

4.0 2.8 3.6 3.7 – – – – 12 034L0028

8.6 6.1 7.7 7.9 – – – 1 1⁄8 – 034L0026

8.6 6.1 7.7 7.9 – – – – 28 034L0031

[kW]

R404A/

R407C [in] [mm] [in] [mm]

R507

Flare

connection 2)

⁄2 12 034L0021

⁄8 16 034L0022

Code no.

Solder

connection

⁄2 – 034L0023

⁄8 16 034L0029

⁄8 22 034L0025

Code no.

The connection dimensions chosen must not be too small, as gas velocities in excess of 40 m / s at the inlet of the regulator can result in ﬂow noise.

Note:

All Danfoss products fulﬁll the requirements in REACH.

One of the obligations in REACH is to inform customers about presence of Candidate list substances if any, we hereby inform you about one substance on the candidate list: an O-ring used in this product contains Diisopentylphthalat (CAS no: 605-50-5) in a concentration above

0.1% w/w.

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Data sheet | Evaporator pressure regulator, type KVP

Capacity

Regulator capacity Qe 1) [kW] with oﬀset = 0.6 bar

Pressure drop

Type

KVP 12 KVP 15 KVP 22

KVP 28 KVP 35

in regulator

∆p

[bar] -30 -25 -20 -15 -10 -5 0 5

0.1 1.9 2.1 2.3 2.6 2.9 3.2 3.5 3.8

0.2 2.5 2.9 3.2 3.6 4.0 4.4 4.9 5.3

0.3 3.0 3.4 3.8 4.3 4.8 5.3 5.9 6.5

0.4 3.3 3.8 4.3 4.9 5.5 6.1 6.7 7.4

0.5 3.4 4.1 4.7 5.3 6.0 6.7 7.4 8.2

0.6 3.6 4.2 5.0 5.7 6.4 7.2 8.0 8.8

0.1 4.0 4.5 5.0 5.6 6.2 6.8 7.5 8.2

0.2 5.4 6.2 6.9 7.7 8.6 9.5 10.4 11.4

0.3 6.3 7.3 8.2 9.3 10.3 11.5 12.6 13.9

0.4 7.0 8.1 9.2 10.4 11.7 13.0 14.4 15.8

0.5 7.4 8.7 10.0 11.4 12.8 14.3 15.9 17.5

0.6 7.6 9.1 10.6 12.2 13.8 15.4 17.1 18.9

Regulator capacity Qe 1) [kW] with oﬀset = 0.6 bar

Pressure drop

Type

KVP 12 KVP 15 KVP 22

KVP 28 KVP 35

) The capacities are based on liquid temperature ahead of expansion valve tl = 25 °C regulator oﬀset = 0.6 bar Dry saturated gas ahead of regulator

in regulator

∆p

[bar] -15 -10 -5 0 5 10 15 20

0.1 1.8 2.1 2.3 2.6 2.9 3.2 3.6 3.9

0.2 2.5 2.8 3.2 3.6 4.0 4.5 5.0 5.5

0.3 2.9 3.4 3.8 4.3 4.9 5.4 6.0 6.6

0.4 3.2 3.7 4.3 4.9 5.5 6.1 6.8 7.6

0.5 3.4 4.0 4.6 5.3 6.0 6.8 7.5 8.3

0.6 3.5 4.2 4.9 5.7 6.4 7.3 8.1 9.0

0.1 3.9 4.5 5.0 5.6 6.2 6.9 7.6 8.4

0.2 5.3 6.1 6.9 7.8 8.7 9.6 10.6 11.7

0.3 6.3 7.2 8.2 9.3 10.4 11.6 12.9 14.2

0.4 6.9 8.0 9.2 10.5 11.8 13.2 14.6 16.2

0.5 7.3 8.6 10.0 11.4 12.9 14.5 16.1 17.9

0.6 7.5 9.0 10.5 12.1 13.8 15.6 17.4 19.3

Evaporating temperature t

[°C]

Evaporating temperature te [°C]

R22

R134 a

Correction factors for liquid temperature t

[°C]

R22 0.93 0.96 1.0 1.04 1.08 1.13

R134a 0.92 0.96 1.0 1.05 1.10 1.16

15 20 25 30 35 40

Correction factors for oﬀset

Oﬀset

[bar]

KVP 12 KVP 15 KVP 22

KVP 28 KVP 35

0.2 0.4 0.6 0.8 1.0 1.2 1.4

2.5 1.4 1.0 0.77 0.67 0.59 –

– 1.4 1.0 0.77 0.67 0.59 0.53

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Data sheet | Evaporator pressure regulator, type KVP

Capacity (continued)

Regulator capacity Qe 1) [kW] with oﬀset = 0.6 bar

Pressure drop

Type

KVP 12 KVP 15 KVP 22

KVP 28 KVP 35

in regulator

∆p

[bar] -35 -30 -25 -20 -15 -10 -5 0

0.1 1.4 1.6 1.8 2.1 2.3 2.6 2.8 3.2

0.2 1.9 2.2 2.5 2.8 3.2 3.6 4.0 4.4

0.3 2.2 2.5 3.0 3.5 3.9 4.4 4.8 5.4

0.4 2.4 2.9 3.3 3.9 4.3 4.9 5.5 6.2

0.5 2.5 3.1 3.6 4.2 4.8 5.5 6.1 6.8

0.6 2.6 3.2 3.9 4.4 5.1 5.8 6.5 7.4

0.1 2.9 3.4 3.9 4.4 5.0 5.5 6.0 6.8

0.2 4.0 4.7 5.4 6.2 6.8 7.7 8.4 9.6

0.3 4.7 5.5 6.4 7.3 8.2 9.2 10.3 11.6

0.4 5.1 6.1 7.2 8.2 9.3 10.5 11.7 13.2

0.5 5.5 6.6 7.7 9.0 10.2 11.4 12.9 14.5

0.6 5.7 6.9 8.2 9.6 10.9 12.4 13.8 15.7

Regulator capacity Qe 1) [kW] with oﬀset = 0.6 bar

Pressure drop

Type

KVP 12 KVP 15 KVP 22

KVP 28 KVP 35

) The capacities are based on liquid temperature ahead of expansion valve tl = 25 °C regulator oﬀset = 0.6 bar Dry saturated gas ahead of regulator

in regulator

∆p

[bar] -30 -25 -20 -15 -10 -5 0 5

0.1 1.6 1.8 2.0 2.3 2.7 3.0 3.3 3.6

0.2 2.2 2.5 2.8 3.2 3.7 4.1 4.6 5.1

0.3 2.6 3.0 3.4 3.9 4.4 4.9 5.5 6.2

0.4 2.8 3.3 3.8 4.4 5.1 5.7 6.3 7.1

0.5 2.9 3.6 4.2 4.8 5.5 6.2 7.0 7.9

0.6 3.1 3.7 4.5 5.1 5.9 6.7 7.5 8.4

0.1 3.4 3.9 4.5 5.0 5.7 6.3 7.1 7.9

0.2 4.6 5.4 6.1 6.9 7.9 8.8 9.8 10.9

0.3 5.4 6.4 7.3 8.4 9.5 10.7 11.8 13.3

0.4 6.0 7.0 8.2 9.4 10.8 12.1 13.5 15.2

0.5 6.4 7.6 8.9 10.3 11.8 13.3 14.9 16.8

0.6 6.5 7.9 9.4 11.0 12.7 14.3 16.1 18.1

R404A/R507

Evaporating temperature te [°C]

R407C

Evaporating temperature te [°C]

Correction factors for temperature t

[°C]

R404A/R507 0.89 0.94 1.0 1.07 1.16 1.26

R407C 0.91 0.95 1.0 1.05 1.11 1.18

15 20 25 30 35 40

Correction factors for oﬀset

Oﬀset

[bar]

KVP 12 KVP 15 KVP 22

KVP 28 KVP 35

0.2 0.4 0.6 0.8 1.0 1.2 1.4

2.5 1.4 1.0 0.77 0.67 0.59 –

– 1.4 1.0 0.77 0.67 0.59 0.53

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Data sheet | Evaporator pressure regulator, type KVP

Sizing

Valve selection

For optimum performance, it is important to select a KVP valve according to system conditions and applications.

Example

When selecting the appropriate valve it may be necessary to convert the actual evaporator capacity using a correction factor. This is required when your system conditions are diﬀerent than the table conditions. The selection is also dependant on the acceptable pressure drop across the valve.

The following data must be used when sizing a KVP valve:

• Refrigerant

• Evaporator capacity: Qe in [kW]

• Evaporating temperature (required temperature): te in [°C]

• Minimum evaporating temperature: te in [°C]

• Liquid temperature ahead of expansion valve: tl in [°C]

• Connection type: ﬂare or solder

• Connection size in [in.]

The following example illustrates how this is done:

• Refrigerant: R134a

• Evaporator capacity: Qe = 4.2 kW

• Evaporating temperature: te = 5 °C ~ 2.5 bar

• Minimum evaporating temperature:

1.4 °C ~ 2.1 bar

• Liquid temperature ahead of expansion valve: tl = 30 °C

• Connection type: Solder

• Connection size: 5⁄8 in.

Step 1

Determine the correction factor for liquid temperature tl ahead of expansion valve.

Correction factors for liquid temperature t

[°C]

R134a 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

10 15 20 25 30 35 40 45 50

Step 2

Determine the correction factor for the valve oﬀset. The oﬀset is deﬁned as the diﬀerence between the design evaporating pressure and the minimum evaporating pressure. From the oﬀset correction factor table, an oﬀset of 0.4 bar (2.5 – 2.1) corresponds to a factor of 1.4.

From the correction factors table (see below) a liquid temperature of 30 °C, R134a corresponds to a factor of 1.05.

Correction factors for oﬀset

Oﬀset

[bar]

KVP 12 KVP 15 KVP 22

KVP 28 KVP 35

0.2 0.4 0.6 0.8 1.0 1.2 1.4

2.5 1.4 1.0 0.77 0.67 0.59 –

– 1.4 1.0 0.77 0.67 0.59 0.53

Step 3

Corrected evaporator capacity is Qe = 1.05 × 1.4 × 4.2 = 6.2 kW

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Data sheet | Evaporator pressure regulator, type KVP

Valve selection (continued)

Design / Function KVP

1. Protective cap

2. Gasket

3. Setting screw

4. Main spring

5. Valve body

6. Equalization bellows

7. Valve plate

8. Valve seat

9. Damping device

10. Pressure gauge connection

11. Cap

12. Gasket

13. Insert

Step 4

Now select the appropriate capacity table (R134a) and choose the column for an evaporating temperature of te = 5 °C.

Using the corrected evaporator capacity, select a valve that provides an equivalent or greater capacity at an acceptable pressure drop. KVP 12, KVP 15, KVP 22 delivers 6.4 kW at a 0.6 bar pressure drop across the valve.

Step 5

KVP 15, 5⁄8 in. solder connection: code no. 034L0029, see Ordering table.

KVP 28, KVP 35 delivers 6.2 kW at a 0.1 bar pressure drop across the valve.

Based on the required connection size of 5⁄8 in., the KVP 15 is the proper selection for this example.

1 2 3 4 5 6 7 8 9

11 12 13

The evaporator pressure regulator, type KVP opens on a rise in pressure on the inlet side, i.e. when the pressure in the evaporator exceeds the set value.

Type KVP regulates inlet pressure only. Pressure variations on the outlet side of the regulator do not aﬀect the degree of opening as the valve is equipped with equalization bellows (6).

The bellows have an eﬀective area corresponding to that of the valve seat neutralising any aﬀect to the setting.

The KVP is also equipped with a damping device (9) providing protection against pulsations which can normally arise in a refrigeration system.

The damping device helps to ensure long life for the regulator without impairing regulation accuracy.

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Data sheet | Evaporator pressure regulator, type KVP

P-band and Oﬀset

Capacity

Setting

oﬀset

P- band

Danfoss

34L181.10

[bar]

Proportional band

The proportional band or P-band is deﬁned as the amount of pressure required to move the valve plate from a closed to a fully open position.

Example

If the valve is set to open at 4 bar and the valve P-band is 1.7, the valve will provide maximum capacity when the inlet pressure reaches 5.7 bar.

Oﬀset

The oﬀset is deﬁned as the permissible pressure variation in evaporator pressure (temperature). It is calculated as the diﬀerence between the required working pressure and the minimum allowable pressure. The oﬀset is always a part of the P-band.

Example with R22

A working temperature of 5 °C ~ 4.9 bar is required, and the temperature must not drop below 0.5 °C ~ 4.1 bar. The oﬀset will then be 0.8 bar. When selecting a valve, be sure to correct the evaporator capacity based on the required oﬀset.

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Dimensions and weights

Type

KVP 12

KVP 15

Connection

Flare Solder ODF

[in.] [mm] [in.] [mm]

⁄2 121⁄2 12 19 19 179 99 66 64 41 10 30 0.4

⁄8 165⁄8 16 24 24 179 99 66 64 41 12 30 0.4

NV1NV2H1H2H3B1B2C øD

[mm] [mm] [mm] [mm] [mm] [mm] [mm] [mm] [mm] [Kg]

Net

weight

KVP 22 – –7⁄8 22 24 24 179 99 66 64 41 17 30 0.4

KVP 28 – – 1 1⁄8 28 24 24 259 151 103 105 48 20 43 1.0

KVP 35 – – 1

⁄8 35 – – 259 151 103 105 48 25 43 1.0

oss can accept no responsibility for possible errors in catalogues, brochures and other printed material. Danfoss reserves the right to alter its products without notice. This also applies to products

vided that such alterations can be made without subsequential changes being necessary eady agreed.

DKRCC.PD.HA0.D8.02 | 8

Danfoss Electronics KVP Data Sheet

Specifications and Main Features

Frequently Asked Questions

User Manual