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

Data Sheet

Condensing pressure regulator, type KVR Diﬀerential pressure valve, type NRD

Maintains a constant and suciently high condenser and receiver pressure

Regulating system KVR and NRD is used to maintain a constant and suciently high condenser and receiver pressure in refrigeration and air conditioning plant with air-cooled condensers.

KVR can also be used together with receiver pressure regulator, type KVD.

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 gauge connection

• Available with are and ODF solder connections

• KVR 12 - KVR 22 and NRD: May be used in the following EX range: Category 3 (Zone 2)

AI251086497566en-001001

Hot gas capacity application

Liquid capacity application

Refrigerants

R22, R32**, R134a, R290*, R404A, R407A, R407C, R407F, R407H, R410A**, R448A, R449A, R449B, R450A, R452A, R452B**, R454A*, R454B**, R454C*, R455A*, R507, R513A, R515B, R516A, R600*, R600a*, R1233zd(E)**, R1234ze(E)*, R1234yf*, R1270* *KVR 12 – KVR 22 only; see more details in the note below the table **NRD only

Adjustment range 5 – 17.5 bar

Factory setting = 10 bar

Maximum working pressure KVR: PS/MWP = 28 bar

NRD: PS/MWP = 49 bar

Maximum test pressure KVR: Pe = 31 bar

NRD: Pe = 81 bar

Medium temperature range KVR: -45 – 130 °C,

NRD: -50 – 155 °C

P-band KVR 12 – 22 = 6.2 bar

KVR 28 – 35 = 5 bar

Minimum opening pressure

dierential for NRD

Start opening: Δp = 1.4 bar

Condensing pressure regulator, type KVR and dierential pressure valve, type NRD

Applications

Application

Table 1: Application

Product specication

Technical data

Table 2: Technical data

This product (KVR 12 – KVR 22) is evaluated for R290, R454A, R454C, R455A, R600, R600a, R1234ze(E), R1234yf, R1270 by ignition source assessment in accordance with standard EN ISO80079-36. Flare connections are only approved for A1 and A2L refrigerants.

NRD is evaluated for R32, R1270, R290, R452B, R454A, R454B, R454C R455A, R600, R600a, R1233zd(E), R1234ze(E), R1234yf, R1270 by ignition source assessment in accordance with standard EN ISO80079-36.

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

123456789101112131415161718192021

KVR

NRD

= 8 mm

1 2

3

4

5

6

10 11 12

13

7 8 9

14

15

16

17

18

19

20

21

Seal cap

Gasket

Setting screw

Main spring

Valve body

Equalizing bellows

Valve plate

Valve seat

Damping device

Pressure gauge connection

Cap

Gasket

Insert

Copper tube

Washer

Teon disk

Piston

Spring

Valve body

Guide

Stop face

Condensing pressure regulator, type KVR and dierential pressure valve, type NRD

Design and materials

Table 3: Design / Function

Condensing pressure regulator, type KVR opens upon a rise in pressure on the inlet side, i.e. when the pressure in the condenser reaches the set value. KVR regulation is dependent only on the inlet pressure. Pressure variations on the outlet side of the regulator do not aect the degree of opening, since type KVR has an equalizing bellows (6). The eective area of this bellows corresponds to that of the valve seat.

In addition, the regulator is equipped with an eective damping device (9) to safe-guard against pulsations which can normally occur in refrigeration plant.

The damping device contributes to ensuring a long working life for the regulator without impairing regulation accuracy.

Dierential valve type NRD begins to open when the pressure drop in the valve is 1.4 bar.

X

Y

A

B

E

C

D

G

F

ABCDEFGXY

Rated capacity

Set point

Oset

P-band

Min. setting point

Max. setting point

Adjustment range

capacity

bar

Condensing pressure regulator, type KVR and dierential pressure valve, type NRD

Figure 1: P-band and Oset (Principle diagram)

Proportional band

The proportional band or P-band is dened as the amount of pressure required to move the valve plate from closed (set point) to fully open position.

Example

If the valve is set to open at 10 bar and the valve P-band is 6.2, the valve will give maximum capacity when the inlet pressure reaches 16.2 bar.

Oset

The oset is dened as the amount of pressure required to move the valve plate from closed position (set point) to the necessary opening degree for the actual load. The oset is always a part of the P-band.

Example with R22

A working temperature of 36 °C ~ 13 bar is required, and the temperature must not drop below 27 °C ~ 10 bar (set point). The oset will then be 3 bar.

Sizing

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

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

• Refrigerant: HCFC, HFC and HC: KVR 12 – KVR 22, HCFC and non-ammable HFC: KVR 28 – KVR 35

• Evaporator capacity Qe (plant capacity)

• Evaporating temperature te in [°C]

• Condensing temperature te in [°C]

• Connection type: are or solder

• Connection size in [in]

Valve selection

Example

When selecting the appropiate valve it may be necessary to convert the actual evaporator capacity using a correction factors. 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. KVR in a liquid capacity application

• Refrigerant: R22 example

• Evaporator capacity:Qe= 100 kW (plant capacity)

• Evaporating temperature: te= -40 °C

• Condensing temperature: tc= 30 °C

• Connection type: Solder

• Connection size: 5⁄8 in

te / [°C]

-40

-30

-20

-10010

R22

1.09

1.05

1.0210.98

0.96

R134a

1.14

1.09

1.0410.96

0.93

R404A, R507

1.18

1.11

1.0510.95

0.92

R407C

1.12

1.08

1.0410.97

0.93

KVR

NRD

L

L1

D

Type

Connection

NV1

NV2H1H2H3LL1B1

B2

C Sol‐

der

øD

Net

weight

Flare

Solder ODF

[in]

[mm]

[in]

[mm]

[Kg]

KVR 12

1⁄2121⁄2121919179

99

66––

644110300.4

KVR 15

5⁄8165⁄8162424179

99

66––

644112300.4

KVR 22––

7⁄822––179

99

66––

644117300.4

Condensing pressure regulator, type KVR and dierential pressure valve, type NRD

Step 1

Determine the correction factor for evaporating temperature te. From the correction factors table an evaporating temperature of -40 °C, R22 corresponds to a factor of 1.09.

Plant capacity x correction factor = table capacity

Step 2

Corrected evaporator capacity is Qe = 100 x 1.09 = 109.0 kW

Step 3

Now select the appropriate capacity table and choose the line for a condensing temperature tC= 30 °C.

Using the corrected evaporator capacity, select a valve that provides an equivalent or greater capacity at an acceptable pressure drop.

KVR 12, KVR 15, KVR 22 delivers 142.9 kW at 1.6 bar pressure drop across the valve. Based on the required connection size of

5

⁄8 in. ODF, the KVR 15 is the proper selection for this example.

Step 4

KVR 15,

5

⁄8 in. solder connection: code no. 034L0097 (see ordering list)

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

Table 4: Dimensions

Type

Connection

NV1

NV2H1H2H3LL1B1

B2

C Sol‐

der

øD

Net

weight

Flare

Solder ODF

[in]

[mm]

[in]

[mm]

[Kg]

KVR 28––

1 1⁄828––259

151

103––

1054820431

KVR 35––

1 3⁄835––259

151

103––

1054825431

NRD––

1⁄212–––––

13110–––220.1

Type

Rated liquid capacity

(1)

(Evaporator ca‐

pacity) [kW]

Rated hot gas

(1)

(Evaporator capacity)

[kW]

Flare connect.

(2)

Code no.

Solder Connect.

Code no.

R22

R134a

R404A/

R507

R407C

R22

R134a

R404A/

R507

R407C

[in]

[mm]

[in]

[mm]

KVR 12

50.4

47.3

36.6

54.4

13.2

11.61214.3

1⁄212034L0091

1⁄2–034L0093

50.4

47.3

36.6

54.4

13.2

11.61214.3––––12034L0096

KVR 15

50.4

47.3

36.6

54.4

13.2

11.61214.3

5⁄816034L0092

5⁄816034L0097

KVR 22

50.4

47.3

36.6

54.4

13.2

11.61214.3–––7⁄822034L0094

KVR 28

129

121

93.7

139.3

34.9

30.6

34.9

37.7–––1

1

⁄8

–

034L0095

129

121

93.7

139.3

34.9

30.6

34.9

37.7––––28034L0099

KVR 35

129

121

93.7

139.3

34.9

30.6

34.9

37.7–––1

3

⁄8

35

034L0100

NRD

–––––––––––

1⁄2–020B1132––––––––––––12020B1136

Condensing pressure regulator, type KVR and dierential pressure valve, type NRD

Ordering

Table 5: KVR 12, KVR 15, KVR 22, KVR 28, KVR 35, NRD

(1)

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

To select the product for other conditions or refrigerants, use Danfoss Coolselector®2. Rated capacity is based on:

Rated capacity is based on:

• evaporating temperature te = -10 °C

• condensing temperature tc = 30 °C

• pressure drop across the valve

◦ Δp = 0.2 bar for liquid capacity

◦ Δp = 0.2 bar for liquid capacity ◦ Δp = 0.4 bar for hot gas capacity

◦ Δp = 0.4 bar for hot gas capacity

oset = 3 bar

•

(2)

KVR are delivered without are nuts. Separate are nuts can be delivered:

• 1⁄2 in / 12 mm, code no. 011L1103

• 5⁄8 in / 16 mm, code no. 011L1167

File name

Document type

Document topic

Approvals Authority

Danfoss 034L9625.AB

Manufacturers Declaration

PED/RoHS

Danfoss

Danfoss 034R9541.AA

Manufacturers Declaration

China RoHS

Danfoss

EAC RU Д-DK.БЛ08.В.00191_18

EAC Declaration

EAC

LLC CDC EURO-TYSK UA.089.D.00188-17

UA Declaration

TYSK

UL SA7200

UL Certicate

UL

Condensing pressure regulator, type KVR and dierential pressure valve, type NRD

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 6: 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.

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

Specifications and Main Features

Frequently Asked Questions

User Manual