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

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Data sheet

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

The condensing pressure regulator, type KVR can be mounted in either the gas or liquid side of the condenser in refrigeration and air conditioning systems. They are used to maintain a constant and suﬃciently high condensing pressure with systems using air-cooled condensers.

They can also be used with valve types NRD or KVD to assure that adequate pressure is maintained on the receiver.

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

• ¼ in. Schrader valve for pressure gauge connection

• Available with ﬂare or ODF solder connections

• Can be used as a relief valve from high pressure to suction side

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

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Data sheet

Condensing pressure regulator, type KVR and diﬀerential pressure valve, type NRD

Approvals UL LISTED, ﬁle SA7200

EAC

Technical data

Metric conversions 1 psi = 0.07 bar

⁄9 (t1 °F -32) = t2 °C

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*,

Refrigerants

R1233zd (E) **, R123 4ze (E)*, R 1234 y f*, R 1270* KVR 12 – KVR 22 only; see more details in the note below the table **NRD only

HCFC and non-ﬂammable HFC: KVR 28 – KVR 35

Regulation range

Maximum working pressure

Maximum test pressure

Pe = 73.00 – 254.00 psig

Factory setting = 145 psig

KVR: PS/MWP = 406 psig

NRD: PS/MWP = 667 psig

KVR: Pe = 450 psig

NRD: Pe = 870 psig

Medium temperature range KVR: - 49 – 266 °F

P band (full valve stroke)

Opening diﬀerential pressure for NRD

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.

KVR 12 – KVR 22: 90 psi

KVR 28 – KVR 35: 72.5 psi

Start opening: Δp= 20 psi

Fully open: Δp = 43 psi

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. Flare connections are only approved for A1 and A2L refrigerants. NRD is evaluated for R32, 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.

Ordering KVR 12, KVR 15, KVR 22, KVR 28, KVR 35, NRD

Rated liquid capacity 1)

(Evaporator capacity)

Typ e

R22 R134 a

[TR]

R404A/

R507

R407C R22 R13 4a

KV R 12 12. 7 11. 8 8.2 13.8 4.13 3.03 3.27 4.50

KV R 15 12.7 11. 8 8.2 13 .8 4 .13 3.03 3.27 4.50

KVR 22 12.7 11. 8 8.2 13 .8 4.13 3.03 3.27 4.50 – –

KVR 28 32.6 30.2 20.9 35. 5 10.93 8.04 8.66 11. 91 – – 1 1/

KVR 35 32.6 30.2 20.9 35.5 10.93 8.04 8.66 11. 91 – – 1 3/

NRD – – – – – – – – – –

The connection dimensions chosen must not be too small, as gas velocities in excess of 130 ft/s at the inlet of the regulator can result in ﬂow noise.

) Rated capacity is based on:

– evaporating temperature te = 40 °F – condensing temperature tc = 110 °F – pressure drop across the valve

Δp = 3 psi for liquid capacity Δp = 6 psi for hot gas capacity

) KVR are delivered without ﬂare nuts. Separate ﬂare nuts can be delivered:

– 1⁄2 in. code no. 011L1103 – 5⁄8 in. code no. 011L1167

Rated hot gas 1)

(Evaporator capacity)

[TR]

R404A/

R507

Flare

connection 2)

Code no.

Solder

connection

R407C [in.] [in.]

034L 0091

034L0 092

Code no.

034L00 93

034L0097

034L0094

034L0095

034 L0100

02 0-11 32

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Data sheet

Condensing pressure regulator, type KVR and diﬀerential pressure valve, type NRD

Liquid capacity

Metric conversions 1 psi = 0.07 bar

⁄9 (t1 °F -32) = t2 °C 1 TR = 3.5 kW 1 in. = 25.4 mm

Max. regulator capacity Qe 1)

Liquid capacity [TR]

Typ e

temperature t

[°F] 1.5 3 6 10 25 1.5 3 6 10 25

Condensing

50 13.1 17. 6 25.2 32.9 52.6 1.81 2.47 3.52 4.51 6.86

KVR 12 KVR 15 KVR 22

70 11.9 16.0 23.0 30.0 48.0 1.92 2.62 3.75 4.83 7. 44

90 10.6 14. 4 20.8 27.0 43.2 2.04 2.76 3.96 5.12 7.9 4

110 9.2 12.7 18.4 23.9 38.2 2.13 2.89 4.13 5.36 8.34

130 7. 8 11.0 16.0 20.7 33.1 2.20 2.98 4.27 5.54 8.64

50 33.5 45.0 64.4 84.2 134 .6 4.77 6.50 9.31 11 . 9 5 18 .15

KVR 28 KVR 35

70 30.4 41.1 58.9 76.8 12 2.8 5.11 6.93 9.92 12.79 19.66

90 2 7.1 37. 0 53.2 69.2 110. 6 5.42 7. 3 4 10 .4 8 13. 54 20.98

110 23.6 32.6 47. 2 61.3 97. 8 5.67 7. 65 10 .93 14.16 22.06

130 20.0 28.0 40.9 53.0 84.6 5.79 7.83 11. 23 14. 60 22.85

50 12.0 16 .9 24 .0 31.0 49.1 1.40 1.97 2.75 3.50 5.15

KVR 12 KVR 15 KVR 22

70 11.9 16.0 23.0 30.0 48.0 1.92 2.62 3.75 4.83 7. 44

90 9.6 13. 6 19.2 24.8 39.3 1. 50 2.12 2.97 3.80 5.75

110 8.4 11. 8 16.7 21.6 34.2 1.53 2.15 3.03 3.87 5.92

130 7.1 10.0 14. 2 18.3 29.0 1.52 2.14 3.01 3.86 5.95

50 30.7 43.4 61. 3 79.2 126.0 3.72 5.24 7. 31 9.26 13. 60

KVR 28 KVR 35

70 27. 6 39.1 55.3 71.4 113. 0 3.87 5.44 7.63 9.71 14.49

90 24.5 34.7 49.1 63.4 100.0 3.99 5.62 7.8 9 10.07 15. 22

110 21.4 30.2 42.8 55.3 8 7.5 4.06 5.71 8.04 10.28 15.69

130 18.1 25.6 36.3 46.9 74 . 2 4.03 5.68 8.00 10.25 15. 77

) The capacities are based on:

– Evaporating temperature te= 40 °F. – For other evaporating temperatures see table below

(Evaporator capacity)

Oﬀset 45 psi Oﬀset 45 psi

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

Hot gas capacity [TR]

(Evaporator capacity)

R22 R22

R134 a R134 a

Correction factors for evaporating temperature t

[°F]

R22

R134a

System capacity x correction factor = table capacity.

-40 -30 -20 -10 0 10

1.12 1.09 1.05 1.03 1.0 0.98

1.22 1.16 1.10 1.04 1.0 0.96

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Data sheet

Condensing pressure regulator, type KVR and diﬀerential pressure valve, type NRD

Liquid capacity

Metric conversions

1 psi = 0.07 bar

/9 (t1 °F -32) = t2 °C 1 TR = 3.5 kW 1 in. = 25.4 mm

Max. regulator capacity Qe 1)

Liquid capacity [TR]

Condensing

Typ e

KV R 12 KV R 15 KVR 22

KVR 28 KVR 35

KV R 12 KV R 15 KVR 22

KVR 28 KVR 35

) The capacities are based on:

Evaporating temperature te= 40 °F. For other evaporating temperatures see table below.

temperature t

[°F] 1.5 3 6 10 25 1.5 3 6 10 25

50 9.2 12 .4 17. 6 23.0 37. 0 1. 63 2.09 2.99 3.84 5.87

70 8 .1 10.9 15. 7 20.4 32.7 1.60 2 .17 3.10 4.00 6.17

90 7. 0 9.6 13. 8 17.9 28.7 1.65 2.25 3.21 4 .15 6.45

110 5.9 8.2 11. 8 15. 4 24. 5 1.68 2.28 3.27 4.24 6.60

130 4.8 6.8 10.0 13.0 20.6 1. 69 2.31 3.34 4.34 6.78

50 23.6 31. 7 45.2 59.0 94.5 4.06 5.52 7.89 10.15 15 .48

70 20.8 27. 9 40 .1 52.2 83.6 4 .24 5.74 8.20 10.58 16. 32

90 17.9 24.5 35.2 45.9 73.4 4.41 5.96 8.50 10.99 17.06

110 15.1 20.9 30.3 39. 3 62.7 4.88 6.06 8.66 11 .2 2 17. 49

130 12.3 17. 4 25.7 33 .1 52.7 4.49 6.12 8.82 11. 45 17. 92

50 4.2 19. 0 27. 2 35.5 56.8 1.96 2.67 3.80 4. 87 7. 41

70 12 .9 17. 3 24.8 32.4 51. 8 2.07 2.83 4.05 5.22 8.04

90 11. 5 15 .6 22.5 29.2 46.7 2.20 2.98 4.28 5.53 8.58

110 10.0 13 .8 20.1 26.1 41.6 2.32 3 .15 4.50 5.84 9.09

130 8.6 12.1 17.6 22.8 36.4 2.42 3.28 4.70 6.09 9.50

50 36.2 48.6 69.6 90.9 145.4 5.15 7.02 10. 06 12.91 19 .60

70 32. 8 44.4 63.6 82.9 132. 6 5.52 7. 4 8 10.71 13. 81 21.2 3

90 29.3 40.0 57. 5 74.7 119. 5 5.85 7.9 3 11. 32 16.62 22.66

110 25.7 35.5 51.5 66.8 106.6 6 .18 8.34 11.9 1 15 .43 24.05

130 22.0 30.8 45.0 58.3 93.1 6.37 8.61 12. 35 16.06 2 5.14

(Evaporator capacity)

Oﬀset 45 psi Oﬀset 45 psi

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

Hot gas capacity [TR]

(Evaporator capacity)

R404A/R507 R404A/R507

R407C R407C

Correction factors (evaporating temperature)

[°F]

R404A / R507 1.32 1.22 1.14 1.06 1.0 0.95

R407C 1.20 1.15 1.09 1.0 4 1.0 0.96

System capacity x correction factor = table capacity.

-40 -20 0 20 40 50

AI197786435007en-000401 | 4

Data sheet

Condensing pressure regulator, type KVR and diﬀerential pressure valve, type NRD

Sizing

Valve selection

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

Example When selecting the appropriate valve it may be necessary to convert the actual evaporator capacity using a correction factors. 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 example illustrates how this is done.

Application example

Liquid capacity application

• The following data must be used when sizing

• a KVR valve:

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

• Evaporator capacity Qe in [TR]

• Evaporating temperature te in [°F]

• Condensing temperature tc in [°F]

• Connection type: ﬂare or solder

• Connection size in [in.]

KVR in a liquid capacity application

• Refrigerant: R22 example

• Evaporator capacity: Qe= 28.7 TR

• Evaporating temperature: te= -40 °F ~ 21 psig

• Condensing temperature: tc= 90 °F ~ 170 psig

• Connection type: Solder

• Connection size: 5⁄8 in.

Application example

Hot gas capacity application

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Data sheet

Condensing pressure regulator, type KVR and diﬀerential pressure valve, type NRD

Valve selection (continued)

Step 1

Determine the correction factor for evaporating temperature te.

From the correction factors table an evaporating temperature of -40 °F, R22 corresponds to a factor of 1.12.

Correction factors

[°F]

R22 1.12 1.09 1.05 1.03 1.0 0.98

R134a 1.22 1.16 1.10 1.04 1.0 0.96

R404A, R507 1.32 1.22 1.14 1.06 1.0 0.95

R407C 1.20 1.15 1.09 1.04 1.0 0.96

Plant capacity x correction factor = table capacity

-40 -30 -20 -10 0 10

Step 2

Corrected evaporator capacity is Qe = 28.7 x 1.12 = 32.14 TR

Step 3

Now select the appropriate capacity table and choose the line for a condensing temperature tc= 90 °F. Using the corrected evaporator capacity, select a valve that provides an equivalent or greater

KVR 12, KVR 15, KVR 22 delivers 38.2 TR at a 25 psi pressure drop across the valve. Based on the required connection size of

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

for this example.

capacity at an acceptable pressure drop.

Step 4

KVR 15, 5⁄8 in. solder connection: code no. 034L0097

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Data sheet

Condensing pressure regulator, type KVR and diﬀerential pressure valve, type NRD

Design / Function KVR NRD

1. Seal cap

2. Gasket

3. Setting screw

4. Main spring

5. Valve body

6. Equalizing bellows

7. Valve plate

8. Valve seat

9. Damping device

10. Pressure gauge connection

11. Cap

12. Gasket

13. Insert

14. Piston

15. Valve plate

16. Piston guide

17. Valve body

18. Spring

= 5⁄16 in.

2 3

6 7 8

9 10 11

The 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 regulates on the 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 has an eﬀective area corresponding to that of the valve seat neutralizing any changes to the setting.

The valve 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. Diﬀerential valve type NRD begins to open when the pressure drop in the valve is 20 psig.

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Data sheet

Condensing pressure regulator, type KVR and diﬀerential pressure valve, type NRD

P-band and Oﬀset Principle diagram

Capacity

100%

75%

50%

25%

Setting

Metric conversions 1 psi = 0.07 bar

⁄9 (t1°F -32) = t2 °C

Proportional band

The proportional band or P-band is deﬁned 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 120 psig and the valve P-band is 90 psi, the valve will give maximum capacity when the inlet pressure reaches 210 psig.

[psi]

Oﬀset

P-band

Oﬀset

The oﬀset is deﬁned as the permissible pressure variation in condenser 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 110 °F ~ 230 psig is required, and the temperature must not drop below 100 °C ~ 200 psig (set point). The oﬀset will then be 30 psi.

AI197786435007en-000401 | 8

Danfoss 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 already on order pro All trademarks in this material are property of the respec

Dimensions and weights KVR NRD

Metric conversions 1 in. = 25.4 mm 1 lb = 0.454 kg

Connection

Typ e

KV R 12

KV R 15

Flare

Solder

ODF

KVR 22 –

KVR 28 – 1 1/

KVR 35 – 1 3/

NRD –

øD

Net weight

[kg]

NV1NV2H1H2H

/20.748 0. 748 7.0 45 3.898 2.598 – – 2.520 1.614 0. 394 1.181 0.88

/80.945 0.945 7.0 45 3.898 2. 598 – – 2.520 1.614 0.472 1.181 0.88

– – 7. 045 3.898 2.598 – – 2.520 1.614 0.669 1.181 0.88

– – 10 .197 5.945 4. 055 – – 4.13 4 1.890 0.787 1.6 93 2.20

– – 10 .197 5.945 4. 055 – – 4.13 4 1.890 0.984 1.693 2.20

– – – – – 5.157 0.394 – – – 0.866 0.1

L L

Solder

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

AI197786435007en-000401 | 9

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

Specifications and Main Features

Frequently Asked Questions

User Manual