Data sheet
Hot gas bypass regulator
Type KVC
KVC is a hot gas bypass regulator applied for
the adaption of the compressor capacity to the
actual evaporator load.
Placed in a bypass between high and low
pressure sides of the refrigeration system, KVC
imposes a lower limit on the compressor suction
pressure by supplying the low pressure side with
replacement capacity in the form of hot
gas / cool gas from the high pressure side.
Features • Accurate, adjustable pressure regulation
• Wide capacity and operating ranges
• Pulsation damping design
• Stainless steel bellows
• Compact angle design for easy installation
• “Hermetic” brazed construction
• Available with flare and ODF solder
connections
• May be used in the following EX range:
Category 3 (Zone 2)
© Danfoss | DCS (az) | 2018.11
DKRCC.PD.HE0.3C.02 | 1
Data sheet | Hot gas bypass regulator, type KVC
Approvals
Technical data
Ordering
UL LISTED, file SA7200
EAC
Refrigerants
Regulating range
Maximum working pressure PS / MWP = 28 bar
Maximum test pressure Pe = 31 bar
Medium temperature range -45 – 130 °C
Maximum P-band 2.0 bar
Kv value at maximum P-band 1)
1
) The Kv value is the flow of water in [m3 / h] at a pressure drop across valve of 1 bar, ρ = 1000 kg / m
This product is evaluated for R290, R600,
R600a, R1270 by ignition source assessment in
accordance with standard EN13463-1.
R22, R1270, R134a, R290, R404A, R407A, R407C, R407F, R448A, R449A, R450A,
R452A, R507A, R513A, R600, R600a
0.2 – 6.0 bar
Factory setting = 2 bar
KVC 12 = 0.68 m3 / h
KVC 15 = 1.25 m3 / h
KVC 20 = 1.85 m3 / h
For complete list of approved refrigerants,
visit www.products.danfoss.com and search for
individual code numbers, where refrigerants are
listed as part of technical data.
Rated capacity 1)
Type
KVC 12
KVC 15 14.9 9.4 13.6 16.45⁄8 16 034L0142
KVC 22 19.1 12.0 17.4 21.0 – – –
1
) Rated capacity is the regulator capacity at:
- evaporating temperature te = -10 °C,
- condensing temperature tc = 25 °C,
- offset = 0.7 bar.
2
) KVC is supplied without flare nut. Separate flare nuts can be ordered:
1⁄2 in. / 12 mm, code no. 011L1103,
5⁄8 in. / 16 mm, code no. 011L1167.
R22 R134a
7.6 4.8 6.9 8.4
7.6 4.8 6.9 8.4 – – – – 12 034L0146
[kW]
R404A/
R507
R407C [in.] [mm] [in.] [mm]
Flare
connection 2)
1
⁄2 12 034L0141
Code no.
3
Solder
connection
1
⁄2 – 034L0143
5
⁄8 16 034L0147
7
⁄8 22 034L0144
Code no.
REACH requirements
© Danfoss | DCS (az) | 2018.11
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.
All Danfoss products fulfill the requirements in
REACH.
If the discharge tube temperature becomes too
high in relation to the compressor specification,
the installation of an injection valve in a bypass
between liquid line and compressor suction line
is recommended.
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
Diisopentyl phthalate (CAS no: 605-50-5) in a
concentration above 0.1% w/w.
DKRCC.PD.HE0.3C.02 | 2
Data sheet | Hot gas bypass regulator, type KVC
Replacement capacity
R22
Type
KVC 12
KVC 15
KVC 22
1
) The capacities are based on:
- condensing temperature tl = 25 °C.
Offset ∆p Q 1) [kW] suction gas temperature ts after pressure / temperature reduction [°C]
[bar] -45 -40 -30 -20 -10 0 10
0.10 – 2.3 2.4 2.5 2.5 2.6 2.6
0.15 – 3.5 3.6 3.7 3.8 3.9 4.0
0.20 – 4.5 4.7 4.8 4.9 5.0 5.1
0.30 – 5.9 6.1 6.3 6.4 6.5 6.7
0.50 – 6.6 6.8 7.1 7.2 7.3 7.5
0.70 – 7.0 7.2 7.4 7.6 7.8 7.9
1.00 – 7.6 7.9 8.1 8.3 8.5 8.6
1.20 – 8.2 8.5 8.7 8.9 9.1 9.3
0.10 – 3.5 3.6 3.7 3.8 3.9 4.0
0.15 – 4.5 4.7 4.8 4.9 5.0 5.1
0.20 – 5.9 6.1 6.3 6.4 6.5 6.7
0.30 – 8.2 8.5 8.7 8.9 9.1 9.3
0.50 – 11.7 12.1 12.4 12.7 13.0 13.2
0.70 – 13.7 14.2 14.6 14.9 15.2 15.5
1.00 – 15.6 16.2 16.7 17.0 17.3 17.7
1.20 – 16.8 17.4 17.9 18.3 18.7 19.0
0.10 – 3.7 3.8 3.9 4.0 4.1 4.2
0.15 – 5.1 5.2 5.4 5.5 5.6 5.7
0.20 – 6.8 7.0 7.3 7.4 7.5 7.7
0.30 – 8.4 8.6 8.9 9.1 9.3 9.5
0.50 – 14.1 14.5 15.0 15.3 15.6 15.9
0.70 – 17.6 18.1 18.7 19.1 19.5 19.9
1.00 – 21.4 22.4 23.1 23.6 24.1 24.5
1.20 – 23.8 24.6 25.4 25.9 26.4 26.9
Correction factors
When selecting, the required regulator capacity
is to be multiplied by a correction factor
dependent on the condensing temperature.
System capacity × correction factor =
table capacity
The corrected capacity can then be found from
the table. Correction factors for condensing
temperature can be found in section “selection”.
© Danfoss | DCS (az) | 2018.11
DKRCC.PD.HE0.3C.02 | 3
Data sheet | Hot gas bypass regulator, type KVC
Replacement capacity
(continued)
R134 a
Type
KVC 12
KVC 15
KVC 22
1
) The capacities are based on:
- condensing temperature tl = 25 °C.
Offset ∆p Q 1) [kW] suction gas temperature ts after pressure / temperature reduction [°C]
[bar] -45 -40 -30 -20 -10 0 10
0.10 – – 1.4 1.4 1.5 1.7 1.7
0.15 – – 2.1 2.3 2.4 2.5 2.6
0.20 – – 2.9 3.0 3.1 3.2 3.4
0.30 – – 3.7 3.9 4.1 4.3 4.5
0.50 – – 4.2 4.3 4.5 4.8 4.9
0.70 – – 4.4 4.5 4.8 5.0 5.2
1.00 – – 4.8 5.0 5.2 5.5 5.8
1.20 – – 5.1 5.4 5.6 5.8 6.1
0.10 – – 2.1 2.3 2.4 2.5 2.6
0.15 – – 2.9 3.0 3.1 3.2 3.4
0.20 – – 3.7 3.9 4.1 4.3 4.5
0.30 – – 5.1 5.4 5.6 5.8 6.1
0.50 – – 7.4 7.7 8.0 8.4 8.7
0.70 – – 8.7 9.1 9.4 9.9 10.2
1.00 – – 9.9 10.2 10.7 11.3 11.7
1.20 – – 10.6 11.1 11.6 12.2 12.6
0.10 – – 2.3 2.4 2.5 2.6 2.8
0.15 – – 3.2 3.3 3.5 3.6 3.7
0.20 – – 4.3 4.4 4.6 4.9 5.1
0.30 – – 5.2 5.5 5.7 6.0 6.3
0.50 – – 8.9 9.3 9.7 10.1 10.5
0.70 – – 11.0 11.6 12.0 12.6 13.1
1.00 – – 13.7 14.3 14.9 15.6 16.3
1.20 – – 15.0 15.7 16.3 17.2 17.8
Correction factors
When selecting, the required regulator capacity
is to be multiplied by a correction factor
dependent on the condensing temperature.
System capacity × correction factor =
table capacity
The corrected capacity can then be found from
the table. Correction factors for condensing
temperature can be found in section “selection”.
© Danfoss | DCS (az) | 2018.11
DKRCC.PD.HE0.3C.02 | 4
Data sheet | Hot gas bypass regulator, type KVC
Replacement capacity
(continued)
R404A/R507
Type
KVC 12
KVC 15
KVC 22
1
) The capacities are based on:
- condensing temperature tl = 25 °C.
Offset ∆p Q 1) [kW] suction gas temperature ts after pressure / temperature reduction [°C]
[bar] -45 -40 -30 -20 -10 0 10
0.10 – 1.9 2.0 2.1 2.2 2.3 2.4
0.15 – 3.0 3.1 3.3 3.4 3.5 3.6
0.20 – 3.9 4.1 4.2 4.5 4.7 4.7
0.30 – 5.1 5.4 5.6 5.8 6.0 6.1
0.50 – 5.7 6.0 6.4 6.6 6.8 7.0
0.70 – 6.0 6.4 6.6 6.9 7.2 7.3
1.00 – 6.6 6.9 7.2 7.5 7.8 8.0
1.20 – 7.0 7.4 7.7 8.0 8.4 8.5
0.10 – 3.0 3.1 3.3 3.4 3.5 3.6
0.15 – 3.9 4.1 4.2 4.5 4.7 4.7
0.20 – 5.1 5.4 5.6 5.8 6.0 6.1
0.30 – 7.0 7.4 7.7 8.0 8.4 8.5
0.50 – 10.1 10.6 11.1 11.6 12.0 12.3
0.70 – 11.8 12.5 13.0 13.6 14.1 14.4
1.00 – 13.5 14.2 14.8 15.5 16.1 16.4
1.20 – 14.5 15.3 16.0 16.6 17.3 17.7
0.10 – 3.2 3.3 3.5 3.6 3.7 3.8
0.15 – 4.3 4.6 4.8 5.0 5.2 5.3
0.20 – 5.8 6.1 6.4 6.7 7.0 7.1
0.30 – 8.2 8.6 8.9 9.3 9.8 9.9
0.50 – 12.1 12.8 13.4 13.9 14.4 14.7
0.70 – 15.2 16.0 16.6 17.4 18.1 18.4
1.00 – 18.8 19.8 20.7 21.5 22.4 22.8
1.20 – 20.5 21.6 22.6 23.5 24.5 25.0
Correction factors
When selecting, the required regulator capacity
is to be multiplied by a correction factor
dependent on the condensing temperature.
System capacity × correction factor =
table capacity
The corrected capacity can then be found from
the table. Correction factors for condensing
temperature can be found in section “selection”.
© Danfoss | DCS (az) | 2018.11
DKRCC.PD.HE0.3C.02 | 5
Data sheet | Hot gas bypass regulator, type KVC
Replacement capacity
(continued)
R407C
Type
KVC 12
KVC 15
KVC 22
1
) The capacities are based on:
- condensing temperature tl = 25 °C.
Offset ∆p Q 1) [kW] suction gas temperature ts after pressure / temperature reduction [°C]
[bar] -45 -40 -30 -20 -10 0 10
0.10 – 2.4 2.6 2.7 2.8 2.9 3.0
0.15 – 3.7 3.9 4.0 4.2 4.3 4.6
0.20 – 4.8 5.0 5.2 5.4 5.6 5.8
0.30 – 6.3 6.5 6.9 7.0 7.2 7.6
0.50 – 7.0 7.3 7.7 7.9 8.1 8.6
0.70 – 7.4 7.7 8.1 8.4 8.7 9.0
1.00 – 8.1 8.5 8.8 9.1 9.4 9.8
1.20 – 8.7 9.1 9.5 9.8 10.1 10.6
0.10 – 3.7 3.9 4.0 4.2 4.3 4.6
0.15 – 4.8 5.0 5.2 5.4 5.6 5.8
0.20 – 6.3 6.5 6.9 7.0 7.2 7.6
0.30 – 8.7 9.1 9.5 9.8 10.1 10.6
0.50 – 12.4 12.9 13.5 14.0 14.4 15.0
0.70 – 14.5 15.2 15.9 16.4 16.9 17.7
1.00 – 16.5 17.3 18.2 18.7 19.2 20.2
1.20 – 17.8 18.6 19.5 20.1 20.8 21.7
0.10 – 3.9 4.1 4.3 4.4 4.6 4.8
0.15 – 5.4 5.6 5.9 6.1 6.2 6.5
0.20 – 7.2 7.5 8.0 8.1 8.3 8.8
0.30 – 8.9 9.2 9.7 10.0 10.3 10.8
0.50 – 14.9 15.5 16.4 16.8 17.3 18.1
0.70 – 18.7 19.4 20.4 21.0 21.6 22.7
1.00 – 22.7 24.0 25.2 26.0 26.8 27.9
1.20 – 25.2 26.3 27.7 28.5 29.3 30.7
Correction factors
When selecting, the required regulator capacity
is to be multiplied by a correction factor
dependent on the condensing temperature.
System capacity × correction factor =
table capacity
The corrected capacity can then be found from
the table. Correction factors for condensing
temperature can be found in section “selection”.
© Danfoss | DCS (az) | 2018.11
DKRCC.PD.HE0.3C.02 | 6
Data sheet | Hot gas bypass regulator, type KVC
Sizing
Valve selection
For optimum performance, it is important
to select a KVC 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 factor.
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.
Step 1
Determine the correction factor for condensing
temperature tl.
The following data must be used when sizing a
KVC valve:
• Refrigerant
• Minimum suction temperature: ts in [°C] / [bar]
• Compressor load in [kW]
• Evaporator load in [kW]
• Condensing temperature: tl in [°C]
• Connection type: flare or solder
• Connection size in [in.]
The following example illustrates how this is
done:
• Refrigerant: R134a
• Minimum suction temperature:
ts = -12 °C ~ 0.9 bar
• Compressor capacity at -12 °C = 15.4 kW
• Evaporator load at -12 °C = 10.0 kW
• Condensing temperature: tl = 35 °C
• Connection type: solder
• Connection size: 5⁄8 in.
From the correction factors table (see below)
a condensing temperature of 35 °C, R134a
corresponds to a factor of 1.10.
Correction factors for condensing temperature t
t
l
[°C]
R134a 0.88 0.92 0.96 1.0 1.05 1.10 1.16 1.23 1.31
R22 0.90 0.93 0.96 1.0 1.05 1.10 1.13 1.18 1.24
R404A/R507 0.84 0.89 0.94 1.0 1.07 1.16 1.26 1.40 1.57
R407C 0.88 0.91 0.95 1.0 1.05 1.11 1.18 1.26 1.35
10 15 20 25 30 35 40 45 50
l
Step 2
The required replacement capacity is defined as
the (compressor capacity – the evaporator load)
divided by the correction factor =
(15.4-10.0) / 1.10 = 4.9 kW
Step 3
Now select the appropriate capacity table
and choose the column for minimum suction
temperature ts = -20 °C.
KVC 15 delivers 5.4 kW at an offset of 0.3 bar.
Based on the required connection size of 5⁄8 in.
ODF, the KVC 15 is the proper selection for this
example.
Using the corrected replacement capacity, select
a valve that provides an equivalent or greater
capacity than required.
© Danfoss | DCS (az) | 2018.11
Step 4
KVC 15, 5⁄8 in. solder connection:
code no. 034L0147, see ordering list.
DKRCC.PD.HE0.3C.02 | 7
Data sheet | Hot gas bypass regulator, type KVC
Design / Function KVC
1. Protective cap
2. Gasket
3. Setting screw
4. Main spring
5. Valve body
6. Equalization bellows
7. Valve plate
8. Valve seat
9. Damping device
The hot gas bypass regulator KVC opens at a
fall in pressure on the outlet side, i.e. when the
pressure in the evaporator is beyond the set
value.
KVC regulates only in dependence on the outlet
pressure. Pressure variations on the inlet side of
the regulator do not affect the degree of opening
since KVC is equipped with an equalization
bellows (6). This bellows has an effective area
corresponding to that of the valve seat.
The hot gas bypass regulator is also equipped
with an effective damping device (9) against
pulsations which can normally arise in a
refrigeration plant.
The damping device helps to ensure long life
for the regulator without impairing regulation
accuracy.
P-band and Offset
Capacity
Offset
P-band
Proportional band
The proportional band or P-band is defined as
the amount of pressure required to move the
valve plate from closed to full open position.
Example:
If the valve is set to open at 4 bar and the valve
p-band is 2, the valve will give maximum capacity
when the discharge pressure reaches 2 bar.
Danfoss
34L182.11
Setting
[bar]
Offset
The offset is defined as the permissible pressure
variation in suction line 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 R404A:
A suction temperature ahead of the compressor
of 5 °C ~ 6 bar is required, and the temperature
must not drop below 0 °C ~ 5 bar.
The offset will then be 1 bar.
© Danfoss | DCS (az) | 2018.11
DKRCC.PD.HE0.3C.02 | 8
Danf
already on order pro
All trademarks in this material are property of the respec
Dimensions and weights
Type
Flare Solder ODF
[in.] [mm] [in.] [mm] [mm] [mm] [mm] [mm] [mm] [mm] [mm] [Kg]
KVC 12
KVC 15
1
⁄2 12
5
⁄8 16
KVC 22 – –
Connection
NV1NV2H
1
⁄2 12 19 24 179 99 64 10 30 0.4
5
⁄8 16 24 24 179 99 64 12 30 0.4
5
⁄8 22 – – 179 99 64 17 30 0.4
H
1
2
C
B
1
solder
øD
weight
Net
oss 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
vided that such alterations can be made without subsequential changes being necessary eady agreed.
© Danfoss | DCS (az) | 2018.11
tive companies. Danfoss and the Danfoss logotype are trademarks of Danfoss A/S. All rights reserved.
DKRCC.PD.HE0.3C.02 | 9
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