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

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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.

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KVR

NRD

= 8 mm

1 2

10 11 12

7 8 9

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.

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