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
© Danfoss | DCS (rja) | 2020.07
• 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)
AI197786435007en-000401 | 1
Data sheet
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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
5
⁄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.
1
) 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
2
) 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.]
1
2
/
5
034L 0091
8
/
034L0 092
1
5
7
1
Code no.
2
/
034L00 93
8
/
034L0097
8
/
034L0094
8
034L0095
8
034 L0100
2
/
02 0-11 32
© Danfoss | DCS (rja) | 2020.07
AI197786435007en-000401 | 2
Data sheet
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Condensing pressure regulator, type KVR and differential pressure valve, type NRD
Liquid capacity
Metric conversions
1 psi = 0.07 bar
5
⁄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
c
[°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
1
) 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
© Danfoss | DCS (rja) | 2020.07
Correction factors for evaporating temperature t
t
e
[°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
e
AI197786435007en-000401 | 3
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