Danfoss Crankcase pressure regulator, type KVL Data Sheet

Data sheet
Crankcase pressure regulator
Type KVL
Crankcase pressure regulator type KVL is fitted in
the suction line ahead of the compressor.
KVL protects the compressor motor against
overload during start-up after long standstill
periods or after defrost periods (high pressure in
evaporator).
Features
© Danfoss | DCS (rja) | 2017.05
•
•
•
•
•
Accurate, adjustable pressure regulation
Wide capacity and operating ranges
Pulsation damping design
Stainless steel bellows
Compact angle design for easy installation in
any position
• “Hermetic” brazed construction
• Available in a wide size range of flare and ODF
solder types
• KVL 12 – KVL 22: Compliant with ATEX hazard
zone 2
DKRCC.PD.HH0.D7.02 | 1
Data sheet | Crankcase pressure regulator, type KVL
Approvals
UL LISTED, file SA7200
EAN
Technical data
R22, R1270*, R134a, R290*, R404A, R407A, R407C, R407F, R422B, R422D,
R448A, R449A, R450A, R452A, R507A, R513A, R600*, R600a*
* KVL 12 – KVL 22 only
Refrigerants
0.2 – 6 bar
Regulating range
Factory setting = 2 bar
Maximum working pressure
PS/MWP = 18 bar
Maximum test pressure
Pe = 19.8 bar
Medium temperature range
-60 – 130 °C
KVL 12 – 22: 2 bar
Maximum P-band
KVL 28 – 35: 1.5 bar
KVL 12 – 22: 3.2 m3 / h
Kv-value ) with maximum P-band
1
1
KVL 28 – 35: 8.0 m3 / h
) The Kv value is the flow of water in [m3 / h] at a pressure drop across valve of 1 bar, ρ = 1000 kg / m3.
This product (KVL 12 – KVL 22) is approved for
R290, R600, R600a, R1270 by ignition source
assessment in accordance with standard
EN13463-1.
Ordering
Rated capacity 1)
[kW]
Type
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.
Flare
connection 2)
R22
R134a
R404A/
R507
R407C
7.1
5.3
6.3
6.4
1
7.1
5.3
6.3
KVL 15
7.1
5.3
KVL 22
7.1
KVL 12
KVL 28
KVL 35
Solder ODF
Code no.
Code no.
[in]
[mm]
[in]
⁄2
12
034L0041
6.4
–
–
–
6.3
6.5
5
⁄8
16
034L0042
5
5.3
6.3
6.5
–
–
–
7
17.8
13.2
15.9
16.4
–
–
17.8
13.2
15.9
16.4
–
17.8
13.2
15.9
16.4
–
[mm]
⁄2
–
034L0043
–
12
034L0048
⁄8
16
034L0049
⁄8
22
034L0045
–
1 1⁄8
–
034L0046
–
–
–
28
034L0051
–
–
1 3⁄8
35
034L0052
1
) Rated capacity is the regulator capacity at:
suction temperature ts = -10 °C
condensing temperature tc = 25 °C
pressure drop in regulator Δp = 0.2 bar
1
) KVL supplied without flare nuts. Separate flare nuts can be supplied:
1
⁄2 in / 12 mm, code no. 011L1103
5
⁄8 in / 16 mm, code no. 011L1167
2
The connection dimensions chosen must not be
too small, as gas velocities in excess of 40 m / s at
the inlet of the regulator can result in flow noise.
REACH requirements
2 | DKRCC.PD.HH0.D7.02
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.
© Danfoss | DCS (rja) | 2017.11
Data sheet | Crankcase pressure regulator, type KVL
Capacity
Max. regulator capacity Qe 1)
R22
Type
KVL 12
KVL 15
KVL 22
KVL 28
KVL 35
Pressure
drop in
regulator
∆p
Maximum
suction
pressure
PS
[bar]
[bar]
-35
-30
-25
-20
-15
-10
-5
0
5
10
15
0.1
1
1.9
1.2
–
–
–
–
–
–
–
–
–
0.1
2
3.0
3.3
3.1
2.1
0.2
–
–
–
–
–
–
0.1
3
3.0
3.3
3.7
4.1
4.0
2.2
–
–
–
–
–
0.1
4
3.0
3.3
3.7
4.1
4.6
5.0
3.9
0.1
–
–
–
0.1
5
3.0
3.3
3.7
4.1
4.6
5.0
5.5
5.2
1.0
–
–
0.1
6
3.0
3.3
3.7
4.1
4.6
5.0
5.5
6.0
6.2
1.3
—
0.2
1
2.6
1.7
–
–
–
–
–
–
–
–
–
0.2
2
4.2
4.7
4.4
3.0
0.2
–
–
–
–
–
–
0.2
3
4.2
4.7
5.3
5.9
5.6
3.1
–
–
–
–
–
0.2
4
4.2
4.7
5.3
5.9
6.5
7.1
5.5
0.1
–
–
–
0.2
5
4.2
4.7
5.3
5.9
6.5
7.1
7.8
7.3
–
–
–
0.2
6
4.2
4.7
5.3
5.9
6.5
7.1
7.8
8.5
8.7
1.9
–
0.3
1
3.2
2.0
–
–
–
–
–
–
–
–
–
0.3
2
5.2
5.8
5.4
3.7
0.3
–
–
–
–
–
–
0.3
3
5.2
5.8
6.5
7.2
6.9
3.8
–
–
–
–
–
0.3
4
5.2
5.8
6.5
7.2
8.0
8.8
6.7
0.2
–
–
–
0.3
5
5.2
5.8
6.5
7.2
8.0
8.8
9.6
9.0
1.7
–
–
0.3
6
5.2
5.8
6.5
7.2
8.0
8.8
9.6
10.5
10.7
2.3
–
0.1
1
4.1
2.6
–
–
–
–
–
–
–
–
–
0.1
2
7.4
7.9
7.0
4.6
0.4
–
–
–
–
–
–
0.1
3
7.4
8.3
9.3
10.3
8.9
4.7
–
–
–
–
–
0.1
4
7.4
8.3
9.3
10.3
11.4
12.3
8.5
0.2
–
–
–
0.1
5
7.4
8.3
9.3
10.3
11.4
12.6
13.8
11.6
2.2
–
–
0.1
6
7.4
8.3
9.3
10.3
11.4
12.6
13.8
15.1
13.9
2.8
—
0.2
1
5.8
3.6
–
–
–
–
–
–
–
–
–
0.2
2
10.6
11.2
9.8
6.5
0.5
–
–
–
–
–
–
0.2
3
10.6
11.8
13.2
14.7
12.5
6.6
–
–
–
–
–
0.2
4
10.6
11.8
13.2
14.7
16.2
17.5
12.0
0.3
–
–
–
0.2
5
10.6
11.8
13.2
14.7
16.2
17.8
19.6
16.4
3.1
–
–
0.2
6
10.6
11.8
13.2
14.7
16.2
17.8
19.6
21.4
19.6
4.0
–
0.3
1
7.0
4.4
–
–
–
–
–
–
–
–
–
0.3
2
13.0
13.8
12.1
8.0
0.6
–
–
–
–
–
–
0.3
3
13.0
14.6
16.3
18.0
15.4
8.1
–
–
–
–
–
0.3
4
13.0
14.6
16.3
18.0
19.9
21.5
14.7
0.3
–
–
–
0.3
5
13.0
14.6
16.3
18.0
19.9
21.9
24.1
20.0
3.7
–
–
0.3
6
13.0
14.6
16.3
18.0
19.9
21.9
24.1
26.3
24.1
4.9
–
Capacity Qe in [kW] at suction temperature ts after the regulator [°C]
) The values in the capacity tables refer to the evaporator capacity and are based on
liquid temperature tl = 25 °C
1
Correction factors for liquid temperature tl
tl [°C]
R22
10
15
20
25
30
35
40
45
50
0.90
0.93
0.96
1.0
1.05
1.10
1.13
1.18
1.24
Plant capacity × correction factor = the values in the table
© Danfoss | DCS (rja) | 2017.11
DKRCC.PD.HH0.D7.02 | 3
Data sheet | Crankcase pressure regulator, type KVL
Capacity
(continued)
Max. regulator capacity Qe 1)
R134a
Type
KVL 12
KVL 15
KVL 22
KVL 28
KVL 35
Pressure
drop in
regulator
∆p
Maximum
suction
pressure
PS
[bar]
[bar]
-30
-25
-20
-15
-10
-5
0
5
10
15
20
0.1
1
–
–
1.8
1.2
–
–
–
–
–
–
–
0.1
2
–
–
2.9
3.3
3.1
2.2
0.3
–
–
–
–
0.1
3
–
–
2.9
3.3
3.7
4.1
4.1
2.4
–
–
–
0.1
4
–
–
2.9
3.3
3.7
4.1
4.6
5.1
4.2
0.7
–
0.1
5
–
–
2.9
3.3
3.7
4.1
4.6
5.1
5.6
5.6
1.8
0.1
6
–
–
2.9
3.3
3.7
4.2
4.6
5.1
5.6
6.2
6.7
0.2
1
–
–
2.6
1.6
–
–
–
–
–
–
–
0.2
2
–
–
4.2
4.7
4.4
3.1
0.4
–
–
–
–
0.2
3
–
–
4.2
4.7
5.3
5.9
5.8
3.4
–
–
–
0.2
4
–
–
4.2
4.7
5.3
5.9
6.5
7.2
5.9
0.9
–
0.2
5
–
–
4.2
4.7
5.3
5.9
6.5
7.2
7.9
8.0
2.6
0.2
6
–
–
4.2
4.7
5.3
5.9
6.5
7.2
7.9
9.5
8.7
0.3
1
–
–
3.2
2.0
–
–
–
–
–
–
–
0.3
2
–
–
5.2
5.8
5.5
3.8
0.5
–
–
–
–
0.3
3
–
–
5.2
5.8
6.5
7.2
7.1
4.2
–
–
–
0.3
4
–
–
5.2
5.8
6.5
7.2
8.0
8.9
7.3
1.1
–
0.3
5
–
–
5.2
5.8
6.5
7.2
8.0
8.9
9.8
9.8
3.2
0.3
6
–
–
5.8
6.5
7.2
8.0
8.9
9.8
10.7
10.7
11.7
0.1
1
–
–
4.0
2.5
–
–
–
–
–
–
–
0.1
2
–
–
7.3
7.8
6.9
4.8
0.6
–
–
–
–
0.1
3
–
–
7.3
8.2
9.3
10.3
9.1
5.2
–
–
–
0.1
4
–
–
7.3
8.2
9.3
10.3
11.5
12.7
9.2
1.4
–
0.1
5
–
–
7.3
8.2
9.3
10.3
11.5
12.7
14.0
12.6
3.9
0.1
6
–
–
7.3
8.2
9.3
10.3
11.5
12.7
14.0
15.4
15.3
0.2
1
–
–
5.6
3.5
–
–
–
–
–
–
–
0.2
2
–
–
10.5
11.1
9.8
6.7
0.9
–
–
–
–
0.2
3
–
–
10.5
11.8
13.2
14.7
12.9
7.3
–
–
–
0.2
4
–
–
10.5
11.8
13.2
14.7
16.3
18.1
13.1
2.0
—
0.2
5
–
–
10.5
11.8
13.2
14.7
16.3
18.1
19.9
17.8
5.6
0.2
6
–
–
10.5
11.8
13.2
14.7
16.3
18.1
19.9
21.9
21.7
0.3
1
–
–
6.9
4.3
–
–
–
–
–
–
–
0.3
2
–
–
12.9
13.7
12.1
8.2
1.1
–
–
–
–
0.3
3
–
–
12.9
14.5
16.2
18.1
15.8
9.0
–
–
–
0.3
4
–
–
12.9
14.5
16.2
18.1
20.1
22.2
–
–
–
0.3
5
–
–
12.9
14.5
16.2
18.1
20.1
22.2
24.5
21.9
6.8
0.3
6
–
–
12.9
14.5
16.2
18.1
20.1
22.2
24.5
26.9
26.6
Capacity Qe in [kW] at suction temperature ts after the regulator [°C]
) The values in the capacity tables refer to the evaporator capacity and are based on
liquid temperature tl = 25 °C
1
Correction factors for liquid temperature tl
tl [°C]
10
15
20
25
30
35
40
45
50
R134a
0.88
0.92
0.96
1.0
1.05
1.10
1.16
1.23
1.31
Plant capacity × correction factor = the values in the table
4 | DKRCC.PD.HH0.D7.02
© Danfoss | DCS (rja) | 2017.11
Data sheet | Crankcase pressure regulator, type KVL
Capacity
(continued)
Max. regulator capacity Qe 1)
R404A/R507
Type
KVL 12
KVL 15
KVL 22
KVL 28
KVL 35
Pressure
drop in
regulator
∆p
Maximum
suction
pressure
PS
[bar]
[bar]
-35
-30
-25
-20
-15
-10
-5
0
5
10
15
0.1
1
0.9
–
–
–
–
–
–
–
–
–
–
0.1
2
2.5
2.4
1.7
0.3
–
–
–
–
–
–
–
0.1
3
2.5
2.9
3.2
3.2
1.9
–
–
–
–
–
–
0.1
4
2.5
2.9
3.2
3.6
4.0
3.4
0.5
–
–
–
–
0.1
5
2.5
2.9
3.2
3.6
4.0
4.5
4.5
1.5
–
–
–
0.1
6
2.5
2.9
3.2
3.6
4.0
4.5
4.9
5.5
2.1
–
–
0.2
1
1.3
–
–
–
–
–
–
–
–
–
–
0.2
2
3.6
3.4
2.5
0.4
–
–
–
–
–
–
–
0.2
3
3.6
4.0
4.6
4.5
2.7
–
–
–
–
–
–
0.2
4
3.6
4.0
4.6
5.1
5.7
4.8
0.8
–
–
–
–
0.2
5
3.6
4.0
4.6
5.1
5.7
6.3
6.4
2.2
–
–
–
0.2
6
3.6
4.0
4.6
5.1
5.7
6.3
7.0
7.8
2.9
–
–
0.3
1
1.6
–
–
–
–
–
–
–
–
–
–
0.3
2
4.4
4.2
3.0
0.4
–
–
–
–
–
–
–
0.3
3
4.4
5.0
5.6
5.6
3.3
–
–
–
–
–
–
0.3
4
4.4
5.0
5.6
6.3
7.0
5.9
1.0
–
–
–
–
0.3
5
4.4
5.0
5.6
6.3
7.0
7.8
7.8
2.6
–
–
–
0.3
6
4.4
5.0
5.6
6.3
7.0
7.8
8.6
9.6
3.5
–
–
0.1
1
2.0
–
–
–
–
–
–
–
–
–
–
0.1
2
5.9
5.4
3.7
0.5
–
–
–
–
–
–
–
0.1
3
6.2
7.1
8.0
7.2
4.2
–
–
–
–
–
–
0.1
4
6.2
7.1
8.0
9.1
10.0
7.4
1.2
–
–
–
–
0.1
5
6.2
7.1
8.0
9.1
10.0
11.2
10.1
3.3
–
–
–
0.1
6
6.2
7.1
8.0
9.1
10.0
11.2
12.4
12.4
4.4
–
–
0.2
1
2.7
—
–
–
–
–
–
–
–
–
–
0.2
2
8.4
7.6
5.4
0.9
–
–
–
–
–
–
–
0.2
3
8.9
10.1
11.4
10.3
5.9
–
–
–
–
–
–
0.2
4
8.9
10.1
11.4
12.9
14.3
10.6
1.7
–
–
–
–
0.2
5
8.9
10.1
11.4
12.9
14.3
15.9
14.4
4.6
–
–
–
0.2
6
8.9
10.1
11.4
12.9
14.3
15.9
17.5
17.6
6.3
–
–
0.3
1
3.4
–
–
–
–
–
–
–
–
–
–
0.3
2
10.4
9.3
6.5
1.1
–
–
–
–
–
–
–
0.3
3
10.9
12.5
14.0
12.5
7.2
–
–
–
–
–
–
0.3
4
10.9
12.5
14.0
15.8
17.6
13.0
2.1
–
–
–
–
0.3
5
10.9
12.5
14.0
15.8
17.6
19.6
17.7
5.6
–
–
–
0.3
6
10.9
12.5
14.0
15.8
17.6
19.6
21.6
21.7
7.7
–
–
Capacity Qe in [kW] at suction temperature ts after the regulator [°C]
) The values in the capacity tables refer to the evaporator capacity and are based on
liquid temperature tl = 25 °C
1
Correction factors for liquid temperature tl
tl [°C]
R404A/R507
10
15
20
25
30
35
40
45
50
0.84
0.89
0.94
1.0
1.07
1.16
1.26
1.40
1.57
Plant capacity × correction factor = the values in the table
© Danfoss | DCS (rja) | 2017.11
DKRCC.PD.HH0.D7.02 | 5
Data sheet | Crankcase pressure regulator, type KVL
Capacity
(continued)
Max. regulator capacity Qe 1)
R407C
Type
KVL 12
KVL 15
KVL 22
KVL 28
KVL 35
Pressure
drop in
regulator
∆p
Maximum
suction
pressure
PS
[bar]
[bar]
-35
-30
-25
-20
-15
-10
-5
0
5
10
15
0.1
1
1.6
1.0
–
–
–
–
–
–
–
–
–
0.1
2
2.5
2.8
2.7
1.9
0.2
–
–
–
–
–
–
0.1
3
2.5
2.8
3.2
3.6
3.6
2.0
–
–
–
–
–
0.1
4
2.5
2.8
3.2
3.6
4.1
4.6
3.6
0.1
–
–
–
0.1
5
2.5
2.8
3.2
3.6
4.1
4.6
5.1
4.9
1.0
–
–
0.1
6
2.5
2.8
3.2
3.6
4.1
4.6
5.1
5.6
6.0
1.3
–
0.2
1
2.2
1.5
–
–
–
–
–
–
–
–
–
0.2
2
3.5
4.0
3.8
2.7
0.2
–
–
–
–
–
–
0.2
3
3.5
4.0
4.6
5.3
5.0
2.9
–
–
–
–
–
0.2
4
3.5
4.0
4.6
5.3
5.9
6.5
5.1
0.1
–
–
–
0.2
5
3.5
4.0
4.6
5.3
5.9
6.5
7.3
6.9
–
–
–
0.2
6
3.5
4.0
4.6
5.3
5.9
6.5
7.3
8.0
8.4
1.8
–
0.3
1
2.7
1.7
–
–
–
–
–
–
–
–
–
0.3
2
4.4
5.0
4.7
3.3
0.3
–
–
–
–
–
–
0.3
3
4.4
5.0
5.7
6.4
6.2
3.5
–
–
–
–
–
0.3
4
4.4
5.0
5.7
6.4
7.2
8.1
6.2
0.2
–
–
–
0.3
5
4.4
5.0
5.7
6.4
7.2
8.1
8.9
8.5
1.6
–
–
0.3
6
4.4
5.0
5.7
6.4
7.2
8.1
8.9
9.9
10.3
2.2
–
0.1
1
3.4
2.2
–
–
–
–
–
–
–
–
–
0.1
2
6.2
6.8
6.1
4.1
0.4
–
–
–
–
–
–
0.1
3
6.2
7.1
8.1
9.2
8.0
4.3
–
–
–
–
–
0.1
4
6.2
7.1
8.1
9.2
10.3
11.3
7.9
0.2
–
–
–
0.1
5
6.2
7.1
8.1
9.2
10.3
11.6
12.8
10.9
2.1
–
–
0.1
6
6.2
7.1
8.1
9.2
10.3
11.6
12.8
14.2
13.3
2.7
–
0.2
1
4.9
3.1
–
–
–
–
–
–
–
–
–
0.2
2
8.9
9.6
8.5
5.8
0.2
–
–
–
–
–
–
0.2
3
8.9
10.1
11.5
13.1
11.3
6.1
–
–
–
–
–
0.2
4
8.9
10.1
11.5
13.1
14.6
16.1
11.2
0.3
–
–
–
0.2
5
8.9
10.1
11.5
13.1
14.6
16.4
18.2
15.4
3.0
–
–
0.2
6
8.9
10.1
11.5
13.1
14.6
16.4
18.2
20.1
18.8
3.9
–
0.3
1
5.9
3.8
–
–
–
–
–
–
–
–
–
0.3
2
10.9
11.9
10.5
7.1
0.5
–
–
–
–
–
–
0.3
3
10.9
12.6
14.2
16.0
13.9
7.5
–
–
–
–
–
0.3
4
10.9
12.6
14.2
16.0
17.9
19.8
13.7
0.3
–
–
–
0.3
5
10.9
12.6
14.2
16.0
17.9
20.1
22.4
18.8
3.6
–
–
0.3
6
10.9
12.6
14.2
16.0
17.9
20.1
22.4
24.7
23.1
4.8
–
Capacity Qe in [kW] at suction temperature ts after the regulator [°C]
) The values in the capacity tables refer to the evaporator capacity and are based on
liquid temperature tl = 25 °C
1
Correction factors for liquid temperature tl
tl [°C]
10
15
20
25
30
35
40
45
50
R407C
0.88
0.91
0.95
1.0
1.05
1.11
1.18
1.26
1.35
Plant capacity × correction factor = the values in the table
6 | DKRCC.PD.HH0.D7.02
© Danfoss | DCS (rja) | 2017.11
Data sheet | Crankcase pressure regulator, type KVL
Sizing
For optimum performance, it is important to
select a KVL valve according to system conditions
and application.
The following data must be used when sizing a
KVL valve:
• Refrigerant
• Evaporator capacity: Qe in [kW]
• Liquid temperature ahead of expansion valve:
tl in [°C]
• Suction temperature ahead of compressor:
ts in [°C]
• Maximum suction pressure after the regulator:
PS in [bar]
• Connection type: flare or solder
• Connection size in [in.] or [mm]
Valve selection
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 following example illustrates how this is
done:
• Refrigerant: R404A
• Evaporating capacity: 4.0 kW
• Liquid temperature ahead of expansion valve:
35 °C
• Suction temperature ahead of compressor:
-25 °C
• Maximum suction pressure after the regulator:
3.8 bar ~ -7 °C
• Connectiontype: solder
• Connection size: 5⁄8 in.
The selection is also dependant on the
acceptable pressure drop across the valve.
Step 1
Determine the correction factor for liquid
temperature tl ahead of expansion valve.
From the correction factors table (see below) the
correction factor for a liquid temperature at 35 °C
(R404A) corresponds to a factor of 1.16.
Correction factors for liquid temperature tl
tl [°C]
10
15
20
25
30
35
40
45
50
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
Step 2
Corrected evaporator capacity is:
Qe = 4.0 × 1.16 = 4.64 kW
Step 3
Now select the capacity table for R404A and
choose the column with a suction temperature
of -25 °C.
Using the corrected replacement capacity, select
a valve that provides an equivalent or greater
capacity than required.
KVL 12 / KVL 15 / KVL 22 delivers a capacity of
4.6 kW at a pressure drop of 0.2 bar across
the valve and 5.6 kW at a pressure drop of 0.3
bar across the valve. Based on the required
connection size of 5⁄8 in. the KVL 15 valve is the
proper selction for this example.
Step 4
KVL 15, 5⁄8 in. solder connection:
code no. 034L0049, see ordering table.
© Danfoss | DCS (rja) | 2017.11
DKRCC.PD.HH0.D7.02 | 7
Data sheet | Crankcase pressure regulator, type KVL
Design / Function
KVL
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 Crankcase pressure regulator type KVL opens
at pressure fall on the outlet side, i.e. when the
suction pressure ahead of the compressor drops
below the set value.
The KVL only regulates based on the outlet
pressure. Pressure variations on the inlet side of
the regulator do not affect the degree of opening
since the KVL is equipped with an equalization
bellows (6).
This bellows has an effective area corresponding
to that of the valve seat.
8 | DKRCC.PD.HH0.D7.02
The regulator is also equipped with an effective
damping device (9) against pulsations, which
normally occur in a refrigeration plant.
The damping device helps to ensure long life
of the regulator without impairing regulation
accuracy.
© Danfoss | DCS (rja) | 2017.11
Data sheet | Crankcase pressure regulator, type KVL
P-band and Offset
Example with 4 bar setting
Capacity
Set point
[bar]
Min. setting point
Offset
Max. setting point
P-band
Adjustment
range
Proportional band
The p-band is defined as the difference between
the pressure at which the valve plate starts to
open (set point) and the pressure at which the
valve is completely open.
Example
If the valve is set to open at 4 bar and the valve
p-band is 2 bar, the valve will give maximum
capacity when the outlet pressure reaches 2 bar.
© Danfoss | DCS (rja) | 2017.11
Offset
The offset is defined as the difference between
the pressure at which the valve plate starts to
open (set point) and the pressure at which the
valve reaches the necessary opening for the
actual load.
The offset is always a part of the p-band
Because optimal function of a refrigeration plant
is best reached with fully open KVL, the term
offset is normally not used in connection with
the KVL valve.
DKRCC.PD.HH0.D7.02 | 9
Danfoss
34L05.13
Dimensions and weights
Connection
Type
Flare
Solder ODF
[in.]
[mm]
⁄2
12
1
⁄8
16
5
KVL 22
–
–
7
KVL 28
–
KVL 35
–
KVL 12
1
KVL 15
5
H1
H2
B1
C
solder
øD
Net
weight
[in.]
[mm]
[mm]
[mm]
[mm]
[mm]
[mm]
[Kg]
⁄2
12
179
99
64
10
30
0.4
⁄8
16
179
99
64
12
30
0.4
⁄8
22
179
99
64
17
30
0.4
–
1 1⁄8
28
259
151
105
20
43
1.0
–
1 3⁄8
35
259
151
105
25
43
1.0
Danfoss 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
already on order provided that such alterations can be made without subsequential changes being necessary
eady agreed.
All trademarks in this material are property of the respective companies. Danfoss and the Danfoss logotype are trademarks of Danfoss A/S. All rights reserved.
© Danfoss | DCS (rja) | 2017.11
DKRCC.PD.HH0.D7.02 | 10

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