Danfoss KVL 12, KVL 15, KVL, KVL 22, KVL 28 Data sheet

Data Sheet

Crankcase pressure regulator Type KVL

Ensures safe compressor operation

Crankcase pressure regulator type KVL is tted in the suction line ahead of the compressor.

KVL protects the compressor motor against overload during start-up after long standstill periods or after defrost periods (high pressure in evaporator).

Features

• Accurate, adjustable pressure regulation

• Wide capacity and operating ranges

• Pulsation damping design

• Stainless steel bellows

• Compact angle design for easy installation in any position

• “Hermetic” brazed construction

• Available in a wide size range of are and ODF solder types

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

AI246886497547en-001001

= 8mm

1 2

3

4

5

6

9

8

7

123456789

Protective cap

Gasket

Setting screw

Main spring

Valve body

Equalization bellows

Valve plate

Valve seat

Damping device

100%

0.2 1 2 3 4 5 6

S

P

Min.

C

b

Max.

A

O

CbSOPAMin.

Max.

Capacity

bar

Set point

oset

P- band

Adjustment range

Min. setting point

Max. setting point

Crankcase pressure regulator, Type KVL

Functions

Figure 1: Design/Function for KVL

The Crankcase pressure regulator type KVL opens at pressure fall on the outlet side, i.e. when the suction pressure ahead of the compressor drops below the set value.

The KVL only regulates based on the outlet pressure. Pressure variations on the inlet side of the regulator do not

aect the degree of opening since the KVL is equipped with an equalization bellows (6). This bellows has an eective area corresponding to that of the valve seat.

The regulator is also equipped with an eective damping device (9) against pulsations, which normally occur in a refrigeration plant.

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

Figure 2: P-band and Oset

Proportional band

The p-band is dened as the dierence between the pressure at which the valve plate starts to open (set point) and the pressure at which the valve is completely open.

Crankcase pressure regulator, Type KVL

Example

If the valve is set to open at 4 bar and the valve p-band is 2 bar, the valve will give maximum capacity when the outlet pressure reaches 2 bar.

Oset

The oset is dened as the dierence between the pressure at which the valve plate starts to open (set point) and the pressure at which the valve reaches the necessary opening for the actual load.

The oset is always a part of the p-band

Because optimal function of a refrigeration plant is best reached with fully open KVL, the term oset is normally not used in connection with the KVL valve.

Features

Description

Refrigerants

R22, R134a, R290

(1)

, R404A, R407A, R407C, R407F, R407H, R448A, R449A, R449B, R450A, R452A, R454A

(1)

,

R454C

(1)

, R455A

(1)

, R507, R513A, R515B, R516A, R600

(1)

, R600a

(1)

, R1234ze(E)

(1)

, R1234yf

(1)

, R1270

(1)

Regulating range

0.2 – 6.0 bar

Factory setting = 2 bar

Max. working pressure

PS/MWP PS = 18 bar

Max. test pressure

Pe = 19.8 bar

Medium temperature range

-60 – 130 °C

Maximum P-band

KVL 12 – 22 = 2 bar

KVL 28 – 35 = 1.5 bar

Kv-value

(2)

with maximum P-band

KVL 12 – 22 = 3.2 m3 / h

KVL 28 – 35 = 8.0 m3 / h

Crankcase pressure regulator, Type KVL

Product specication

Technical data

Table 1: Technical data for KVL

(1)

KVL 12 – KVL 22 only.

(2)

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

This product (KVL 12 – KVL 22) is evaluated for R290, R454A, R454C, R455A, R600, R600a, R1234ze(E), R1234yf, R2170 by ignition source assessment in accordance with standard EN ISO80079-36. Flare connections are only approved for A1 and A2L refrigerants.

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

Sizing

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

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

• Refrigerant

• Evaporator capacity: Qe in [kW]

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

• Suction temperature ahead of compressor: ts in [°C]

• Maximum suction pressure after the regulator: PS in [bar]

• Connection type: are or solder

• Connection size in [in.] or [mm]

Valve selection

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 dierent than the table conditions. The selection is also dependant on the acceptable pressure drop across the valve.

The following example illustrates how this is done:

• Refrigerant: R404A

• Evaporator capacity: Qe = 4.0 kW

• Liquid temperature ahead of expansion valve: 35 °C

• Suction temperature ahead of compressor: -25 °C

• Maximum suction pressure after the regulator: 3.8 bar ~ -7 °C

• Connection type: Solder

• Connection size:

5

⁄8 in.

Step 1

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

t

l

101520253035404550

[°C]

R134a

0.88

0.92

0.96

1.0

1.05

1.10

1.16

1.23

1.31

R22

0.9

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

1.4

1.57

R407C

0.88

0.91

0.95

1.0

1.05

1.11

1.18

1.26

1.35

Danfoss

34L05.13

Crankcase pressure regulator, Type KVL

From the Table 2: Correction factors for liquid temperature tl (see below) the correction factor for a liquid temperature at 35 °C (R404A) corresponds to a factor of 1.16.

Table 2: Correction factors for liquid temperature t

l

Step 2

Corrected evaporator capacity is: Qe = 4.0 × 1.16 = 4.64 kW

Step 3

Now select the capacity table for R404A and choose the column with a suction temperature of -25 °C.

Using the corrected replacement capacity, select a valve that provides an equivalent or greater capacity than required.

KVL 12 / KVL 15 / KVL 22 delivers a capacity of 4.6 kW at a pressure drop of 0.2 bar across the valve and 5.6 kW at a pressure drop of 0.3 bar across the valve. Based on the required connection size of 5⁄8 in. the KVL 15 valve is the proper selction for this example.

Step 4

KVL 15,

5

⁄8 in. solder connection: code no. 034L0049, see Table 4: Ordering for type KVL.

Valve selection based on capacity calculation

As for extended capacity calculations and valve selection based on capacities and refrigerants, please refer to Coolselector®2. Rated and extended capacities are calculated with the Coolselector®2 calculation engine to ARI standards with the ASEREP equations based on laboratory measurements of selected valves.

Dimensions and Weight

Figure 3: Dimensions for KVL

Type

Connection

H1H2B

1

CøDNet weight

Flare

Solder ODF

[in.]

[mm]

[in.]

[mm]

[Kg]

KVL 12

1

⁄2

12

1

⁄2

12

17999641030

0.4

KVL 15

5

⁄8

16

5

⁄8

16

17999641230

0.4

KVL 22--

7

⁄8

22

17999641730

0.4

KVL 28--

1

⁄8

28

259

151

1052043

1.0

KVL 35--

1

3

⁄8

35

259

151

1052543

1.0

Crankcase pressure regulator, Type KVL

Table 3: Dimensions and Weight for KVL

Type

Rated capacity

(1)

[kW]

Flare connection

(2)

Code no.

Solder connection

Code no.

R22

R134a

R404A/R507

R407C

[in]

[mm]

[in]

[mm]

KVL 12

7.1

5.3

6.3

6.4

1

⁄2

12

034L0041

1

⁄2

–

034L0043

7.1

5.3

6.3

6.4––––12034L0048

KVL 15

7.1

5.3

6.3

6.4

5

⁄8

16

034L0042

5

⁄8

16

034L0049

KVL 22

7.1

5.3

6.3

6.4––

–

7

⁄8

22

034L0045

KVL 28

17.8

13.2

15.9

16.4–––1

1

⁄8

–

034L0046

17.8

13.2

15.9

16.4––––28034L0051

KVL 35

17.8

13.2

15.9

16.4–––1

3

⁄8

35

034L0052

Crankcase pressure regulator, Type KVL

Ordering

Figure 4: Flare connection Figure 5: Solder connection

Table 4: Ordering for type KVL

(1)

Rated capacity is the regulator capacity at

• suction temperature ts = -10 °C

• condensing temperature tc = 25 °C

• pressure drop in regulator Δp = 0.2 bar oset = 0.6 bar

To select the product for other conditions or refrigerants, use Danfoss Coolselector®2

(2)

KVL supplied without are nuts. Separate are nuts can be supplied:

1

•

⁄2 in / 12 mm, code no. 011L1103

•

⁄2 in / 12 mm, code no. 011L1103

5

•

⁄8 in / 16 mm, code no. 011L1167

•

⁄8 in / 16 mm, code no. 011L1167

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 ow noise.

Document name

Document type

Document topic

Approval authority

UL SA7200

Mechanical - Safety Certicate

UL

034R9541.AA

Manufacturers Declaration

China RoHS

Danfoss

034L9630.AA

Manufacturers Declaration

ATEX

Danfoss

Crankcase pressure regulator, Type KVL

Certicates, declarations, and approvals

The list contains all certicates, declarations, and approvals for this product type. Individual code number may have some or all of these approvals, and certain local approvals may not appear on the list.

Some approvals may change over time. You can check the most current status at danfoss.com or contact your local Danfoss representative if you have any questions.

Table 5: Certicates, declarations, and approvals

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Coolselector®2 - nd the best components for you HVAC/R system

Coolselector®2 makes it easy for engineers, consultants, and designers to nd and order the best components for refrigeration and air conditioning systems. Run calculations based on your operating conditions and then choose the best setup for your system design.

Download Coolselector®2 for free at coolselector.danfoss.com.

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Danfoss KVL 12, KVL 15, KVL, KVL 22, KVL 28 Data sheet

Specifications and Main Features

Frequently Asked Questions

User Manual