Danfoss Electronics KVR, NRD Data Sheet
Data sheet
Condensing pressure regulator, type KVR
Differential pressure valve, type NRD
Regulating system KVR and NRD is used to
maintain a constant and sufficiently 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 flare and ODF solder
connections
• KVR 12 - KVR 22 and NRD: May be used in the
following EX range: Category 3 (Zone 2)
© Danfoss | DCS (bh) | 2019.09
AI251086497566en-000901 | 1
Data sheet | Condensing pressure regulator, type KVR and differential pressure valve, type NRD
Approvals
Technical data
Ordering
UL LISTED, file SA7200
EAC
R22, R32**, R1270*, R134a, R290*, R404A, R407A, R407C,
R407F, R407H, R410A**, R448A, R449A, R449B, R450A, R452A,
Refrigerants
Adjustment range
Maximum working pressure
Maximum test pressure
Medium temperature range
P-band
Minimum opening pressure differential for NRD Start opening: Δp = 1.4 bar
KVR 12 - KVR 22 is evaluated for R290, R454A, R454C,
R455A, R600, R600a, R1234ze(E), R1270 by ignition
source assessment in accordance with standard
EN13463-1.
R452B**, R454A*, R454B**, R454C*, R455A*, R507, R513A,
R515B, R516A, R600*, R600a*, R1233zd(E)**, R1234ze(E)*,
R1234yf**
*KVR 12 - KVR 22 and NRD only
**NRD only
5 – 17.5 bar
Factory setting = 10 bar
KVR: PS/MWP = 28 bar
NRD: PS/MWP = 49 bar
KVR: Pe = 31 bar
NRD: Pe = 81 bar
KVR: -45 – 130 °C,
NRD: -50 – 155 °C
KVR 12 – 22 = 6.2 bar
KVR 28 – 35 = 5 bar
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.
NRD is evaluated for R32, R1270, R290, R452B, R454A,
R454B, R454C R455A, R600, R600a, R1233zd(E),
R1234ze(E), R1234yf by ignition source assessment in
accordance with standard EN13463-1.
KVR 12, KVR 15, KVR 22, KVR 28, KVR 35, NRD
Rated liquid capacity 1)
(Evaporator capacity)
Type
R22 R134a
50.4 47.3 36.6 54.4 13.2 11.6 12.0 14.31⁄2 12 034L00911⁄2 – 034L0093
KVR 12
50.4 47.3 36.6 54.4 13.2 11.6 12.0 14.3 – – – – 12 034L0096
KVR 15 50.4 47.3 36.6 54.4 13.2 11.6 12.0 14.35⁄8 16 034L00925⁄8 16 034L0097
KVR 22 50.4 47.3 36.6 54.4 13.2 11.6 12.0 14.3 – – –
129 121 93.7 139.3 34.9 30.6 34.9 37.7 – – – 1
KVR 28
129 121 93.7 139.3 34.9 30.6 34.9 37.7 – – – – 28 034L0099
KVR 35 129 121 93.7 139.3 34.9 30.6 34.9 37.7 – – – 1 3⁄8 35 034L0100
NRD
The connection dimensions chosen must not be too small, since gas velocities in excess of 40 m / s at the inlet of the regulator can give
flow noise.
1
) Rated capacity is based on:
To select the product for other conditions or refrigerants, use Danfoss Coolselector®2.
2
) KVR are delivered without flare nuts. Separate flare nuts can be delivered:
– – – – – – – – – – –
– – – – – – – – – – – – 12 020B1136
– evaporating temperature te = -10 °C
– condensing temperature tc = 30 °C
– pressure drop across the valve
Δp = 0.2 bar for liquid capacity
Δp = 0.4 bar for hot gas capacity
– offset = 3 bar
– 1⁄2 in / 12 mm, code no. 011L1103
– 5⁄8 in / 16 mm, code no. 011L1167
[kW]
R404A/
R507
R407C R22 R134a
Rated hot gas 1)
(Evaporator capacity)
[kW]
R404A/
R507
Flare
connect. 2)
R407C [in] [mm] [in] [mm]
Code no.
Solder
Connect.
7
⁄8 22 034L0094
1
⁄8 – 034L0095
1
⁄2 – 020B1132
Code no.
REACH requirements
© Danfoss | DCS (bh) | 2019.09
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.
AI251086497566en-000901 | 2
Data sheet | Condensing pressure regulator, type KVR and differential pressure valve, type NRD
Liquid capacity
Max. regulator capacity Qe 1)
Liquid capacity in [kW]
Condensing
Type
KVR 12
KVR 15
KVR 22
KVR 28
KVR 35
KVR 12
KVR 15
KVR 22
KVR 28
KVR 35
1
) The capacities are based on:
temperature t
– Evaporating temperature te= -10 °C
– For other evaporating temperatures see table below
c
[°C] 0.1 0.2 0.4 0.8 1.6 0.1 0.2 0.4 0.8 1.6
10 23.7 33.5 47.4 67.0 94.8 42.5 60.2 85.1 120.4 170.5
20 21.8 30.8 43.6 61.7 87.3 39.2 55.4 78.4 110.9 157.0
30 19.8 28.1 39.7 56.2 79.4 35.6 50.4 71.3 100.9 142.9
40 17.8 25.2 35.6 50.4 71.3 32.0 45.3 64.0 90.6 128.3
50 15.7 22.2 31.4 44.4 62.9 28.2 39.9 56.4 79.9 113.1
10 60.5 85.6 121.1 171.2 242.3 108.9 154.0 217.8 308.2 436.2
20 55.7 78.8 111.4 157.6 223.0 100.2 141.8 200.6 283.8 401.7
30 50.7 71.7 101.4 143.4 202.9 91.2 129.0 182.5 258.2 365.5
40 45.9 64.3 91.0 128.7 182.1 81.9 115.8 163.9 231.8 328.2
50 40.1 58.8 80.3 113.6 160.7 72.2 102.1 144.4 204.4 289.3
10 22.8 32.3 45.6 64.6 91.3 40.7 57.5 81.4 115.0 163.0
20 20.8 29.4 41.6 58.8 83.2 37.1 52.5 74.2 105.0 149.0
30 18.7 26.5 37.4 53.0 74.9 33.4 47.3 66.9 94.7 134.0
40 16.6 23.5 33.2 47.0 66.5 29.7 42.0 59.4 84.1 119.0
50 14.5 20.5 29.0 41.0 58.0 25.9 36.6 51.8 73.3 104.0
10 58.3 82.4 117.0 165.0 233.0 104.0 147.0 208.0 295.0 418.0
20 53.1 75.1 106.0 150.0 213.0 94.9 134.0 190.0 269.0 361.0
30 47.8 67.6 95.7 135.0 191.0 85.5 121.0 171.0 242.0 343.0
40 42.5 60.0 84.9 120.0 170.0 76.0 108.0 152.0 215.0 305.0
50 37.0 52.3 74.0 105.0 148.0 66.3 93.7 133.0 188.0 266.0
(Evaporator capacity)
Pressure drop across valve ∆
Liquid capacity in [kW]
(Evaporator capacity)
Offset 1.5 bar Offset 3 bar
[bar]
p
Pressure drop across valve ∆
[bar]
R22 R22
R134 a R134 a
p
Correction factors for evaporating temperature t
t
e
[°C]
R22 1.09 1.05 1.02 1.0 0.98 0.96
R134a 1.14 1.09 1.04 1.0 0.96 0.93
Plant capacity x correction factor = table capacity
-40 -30 -20 -10 0 10
e
© Danfoss | DCS (bh) | 2019.09
AI251086497566en-000901 | 3
Data sheet | Condensing pressure regulator, type KVR and differential pressure valve, type NRD
Liquid capacity
(continued)
Max. regulator capacity Qe 1)
Liquid capacity in [kW]
Condensing
Type
KVR 12
KVR 15
KVR 22
KVR 28
KVR 35
KVR 12
KVR 15
KVR 22
KVR 28
KVR 35
1
) The capacities are based on:
temperature t
– Evaporating temperature te= -10 °C
– For other evaporating temperatures see table below
c
[°C] 0.1 0.2 0.4 0.8 1.6 0.1 0.2 0.4 0.8 1.6
10 18.4 25.9 36.8 52.0 73.5 32.9 46.4 65.6 92.9 131.3
20 16.4 23.2 32.9 46.5 65.7 29.4 41.6 58.8 83.2 117.6
30 14.5 20.5 29.0 41.0 58.0 25.9 36.6 51.8 73.3 103.7
40 12.9 17.6 25.0 35.4 50.1 22.4 31.6 44.7 63.3 89.7
50 10.5 14.9 21.0 29.7 42.1 18.8 26.6 37.6 53.2 75.4
10 46.9 66.3 93.8 132.3 188.0 84.0 118.7 168.0 237.3 337.1
20 42.0 59.3 83.9 118.7 168.0 75.2 106.1 150.2 213.2 301.4
30 37.0 52.3 73.9 104.6 148.1 66.3 93.7 132.3 188.0 265.7
40 31.9 45.2 63.8 90.3 128.1 57.2 81.0 114.5 161.7 228.9
50 26.9 37.9 53.7 75.9 107.0 48.1 68.0 96.2 136.5 193.2
10 25.6 36.2 51.2 72.6 102.3 45.9 65.0 91.9 130.0 184.1
20 23.5 33.2 47.1 66.6 94.3 42.3 59.8 84.7 119.8 169.6
30 21.4 30.3 42.9 60.7 85.7 38.4 54.4 77.0 109.0 154.3
40 19.4 27.5 38.8 55.0 77.7 34.9 49.4 69.8 98.8 139.8
50 17.3 24.4 34.5 48.8 69.2 31.0 43.9 62.0 87.9 124.4
10 65.3 92.4 130.7 184.9 261.7 117.6 166.3 235.2 332.9 471.1
20 60.1 85.1 120.3 170.2 240.8 108.2 153.1 216.6 306.5 433.8
30 54.5 77.4 109.5 154.9 219.1 98.5 139.3 197.1 278.9 394.7
40 50.0 70.1 99.2 140.3 198.5 89.3 126.2 178.7 252.7 357.7
50 44.1 62.5 88.3 124.9 176.8 79.4 112.3 158.8 224.8 318.2
(Evaporator capacity)
Pressure drop across valve ∆
Liquid capacity in [kW]
(Evaporator capacity)
Offset 1.5 bar Offset 3 bar
[bar]
p
Pressure drop across valve ∆
[bar]
R404A / R507 R404A / R507
R407C R407C
p
Correction factors for evaporating temperature t
t
e
[°C]
R404A / R507 1.18 1.11 1.05 1.0 0.95 0.92
R407C 1.12 1.08 1.04 1.0 0.97 0.93
Plant capacity x correction factor = table capacity
-40 -30 -20 -10 0 10
e
© Danfoss | DCS (bh) | 2019.09
AI251086497566en-000901 | 4
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