Danfoss KVR 12, KVR 15, KVR, KVR 22, KVR 28 Data sheet
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Data Sheet
Condensing pressure regulator, type KVR
Di erential 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
Condensing pressure regulator, type KVR and differential pressure valve, type NRD
Applications
Application
Table 1: Application
Hot gas capacity application |
Liquid capacity application |
Product specification
Technical data
Table 2: Technical data
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R22, R32**, R134a, R290*, R404A, R407A, R407C, R407F, R407H, R410A**, R448A, |
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R449A, R449B, R450A, R452A, R452B**, R454A*, R454B**, R454C*, R455A*, R507, |
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Refrigerants |
R513A, R515B, R516A, R600*, R600a*, R1233zd(E)**, R1234ze(E)*, R1234yf*, |
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R1270* *KVR 12 – KVR 22 only; see more details in the note below the table |
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**NRD only |
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Adjustment range |
5 – 17.5 bar |
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Factory setting = 10 bar |
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Maximum working pressure |
KVR: PS/MWP = 28 bar |
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NRD: PS/MWP = 49 bar |
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Maximum test pressure |
KVR: Pe = 31 bar |
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NRD: Pe = 81 bar |
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Medium temperature range |
KVR: -45 – 130 °C, |
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NRD: -50 – 155 °C |
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P-band |
KVR 12 – 22 = 6.2 bar |
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KVR 28 – 35 = 5 bar |
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Minimum opening pressure diˆerential for NRD |
Start opening: Δp = 1.4 bar |
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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.
© Danfoss | Climate Solutions | 2021.03 |
AI251086497566en-001001 | 2 |
Condensing pressure regulator, type KVR and differential pressure valve, type NRD
Design and materials
Table 3: Design / Function
KVR |
NRD |
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1 |
= 8 mm |
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2 |
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3 |
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4 |
14 |
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5 |
15 |
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6 |
16 |
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17 |
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18 |
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7 |
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8 |
19 |
10 |
9 |
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11 |
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20 |
12 |
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13 |
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21 |
1 |
Seal cap |
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8 |
Valve seat |
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15 |
Washer |
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2 |
Gasket |
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9 |
Damping device |
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16 |
Te…on disk |
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3 |
Setting screw |
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10 |
Pressure gauge connection |
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17 |
Piston |
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4 |
Main spring |
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11 |
Cap |
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18 |
Spring |
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5 |
Valve body |
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12 |
Gasket |
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19 |
Valve body |
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6 |
Equalizing bellows |
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13 |
Insert |
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20 |
Guide |
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7 |
Valve plate |
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14 |
Copper tube |
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21 |
Stop face |
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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 aˆect the degree of opening, since type KVR has an equalizing bellows (6). The eˆective area of this bellows corresponds to that of the valve seat.
In addition, the regulator is equipped with an eˆective 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.
Diˆerential valve type NRD begins to open when the pressure drop in the valve is 1.4 bar.
© Danfoss | Climate Solutions | 2021.03 |
AI251086497566en-001001 | 3 |
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