Data Sheet
Float valve
Type HFI
Robust and reliable solution for high pressure control
HFI is a high pressure oat valve with internal
liquid measuring device. The oat valve is
designed for direct ange mounting or welding
on to plate heat exchanger type condensers, as
illustrated in Figure 1: Plate heat exchanger
HFI is direct acting, therefore no dierential
pressure is required to activate the valve.
HFI is robust and reliable due to its simple
design. The oat valve is equipped with a purge
valve for purging non condensable gases e.g.
air from the top of the valve housing. This
feature is also useful if the valve has to be
serviced.
The HFI is available with two external
connections on the housing for drainage and
pressure equalizations.
AI220786430153en-001101
Float valve, type HFI
Features
• Designed for direct ange mounting on to plate heat exchanger type condensers
• Can be mounted directly on vessels
• Temperature range: -50 °C /+80 °C (-58 °F/+176 °F)
• Equipped with purge valve for purging non condensable gasses
• Available with external connections for drainage and pressure equalizations
• Maximum operating pressure is 25 bar (363 psig)
• Suitable for R717 (ammonia), HCFC and HFC with a density of 500 through 700 kg/m3 (31.21 - 43.70 lb/ft3). For
densities outside this range please contact your local Danfoss sales company.
• Housing i.e. shell and ange are made of special steel approved for low temperature application
• Classication: DNV, CRN, BV, EAC etc. To get an updated list of certication on the products please contact your
local Danfoss Sales Company.
Figure 1: Plate heat exchanger
© Danfoss | Climate Solutions | 2021.09 AI220786430153en-001101 | 2
Float valve, type HFI
Media
Refrigerants
Refrigerants
Suitable for R717 (ammonia), HCFC and HFC with a density of 500 through 700 kg/m3 (31.21 - 43.70 lb/ft3). For
densities outside this range please contact your local Danfoss sales company.
Flammable hydrocarbons are not recommended. For further information please contact your local Danfoss Sales
Company.
New refrigerants
Danfoss products are continually evaluated for use with new refrigerants depending on market requirements.
When a refrigerant is approved for use by Danfoss, it is added to the relevant portfolio, and the R number of the
refrigerant (e.g. R513A) will be added to the technical data of the code number. Therefore, products for specic
refrigerants are best checked at store.danfoss.com/en/, or by contacting your local Danfoss representative.
© Danfoss | Climate Solutions | 2021.09 AI220786430153en-001101 | 3
Description
Values
Temperature range
-50 °C / +80 °C (–58 °F /+176 °F)
The oat valve is designed for: Maximum operating pressure
Housing PED 28 bar (407 psig)
Ball (oat) 25 bar (363 psig)
Float valve, type HFI
Product specication
Design
Housing
Housing i.e. shell and ange is made of special steel approved for low temperature operation.
Installation
Refer to installation instruction for HFI.
Figure 2: Identication:
Pressure and temperature data
Table 1: Pressure and temperature
If test pressure exceeds 25 bar (363 psi g) the ball should be removed during test.
Valves for higher pressure are available on request.
The principle of high pressure control
Introduction
In installations with one application high pressure control is an eective and cost saving way of expanding liquid
from the condenser to the low pressure side.
High pressure refrigerant entering the condenser will start to condense, consequently condensate will accumulate
at the bottom of the condenser and in the oat valve.
When capacity demands increase, the liquid level in the oat valve will rise, which will cause the valve to open and
the refrigerant to expand into the separator at the low pressure side.
When the valve is closed, there will still be a small by-pass over the seat, so any remaining liquid will equalize slowly
to the low pressure side, for instance during an o cycle. Therefore the system will equalize automatically and the
compressor can start up without excessive back pressure. The size of the bypass is predetermined and dened by
geometry of the elements.
It follows from the above, that almost all the refrigerant will be accumulated on the low pressure side under normal
conditions. Therefore under normal conditions no high pressure receiver is necessary when using the HFI for high
pressure control.
© Danfoss | Climate Solutions | 2021.09 AI220786430153en-001101 | 4
ΔpρK
Valve type
Nominal capacity
[kW]
(R 717, –10/+35°C)
Valve constant [K]
HFI 040 FD
400
16.79
HFI 050 FD
800
33.58
HFI 060 FD
1200
50.36
HFI 070 FD
2400
100
dierential pressure [bar]
density of liquid [kg/m3]
valve constant (from the above table)
Condens‐
ing temp.
(°C)
Evaporating temperature (°C)
–40
–35
–30
–25
–20
–15
–10–505101520
50
45
40
35
475
460
440
420
480
460
440
420
480
460
440
420
475
460
440
415
475
455
435
415
475
455
430
405
470
445
425
400
460
440
415
390
455
430
405
375
445
420
390
360
430
405
375
340
415
385
350
315
395
360
325
280
30
25
20
15
400
380
360
340
400
380
355
335
400
375
355
330
395
370
350
325
390
365
340
315
385
360
330
300
375
345
315
285
360
330
300
265
345
315
280
240
325
290
250
200
300
260
210
150
270
220
155
230
160
10
5
0
–5
–10
315
290
270
245
220
310
285
260
235
210
305
280
255
225
200
295
270
240
210
180
285
255
225
190
155
270
240
205
165
115
250
215
175
120
225
185
125
195
135
140
Float valve, type HFI
Insert for the high pressure oat valve
Figure 3: Detail A Fully closed Figure 4: Detail B Fully open
Computation and selection
In R 717 plants (ammonia)
On the following pages you will nd tables with capacities of the oat valve at various operating conditions.
Select a valve using the specic operating conditions. The chosen valve must have a capacity higher than the
required capacity during nominal operation, as well as during plant start up.
In plants using other refrigerants than ammonia
The capacity of the oat valve can be calculated by using the values and the equation to the right. However, the
density of the refrigerant must be in the range: 500 to 700 kg/m3.
For densities outside this range please contact your local Danfoss Sales Company.
Table 2: Valve capacity values
Mass ow
G = K Δp × ρ
[kg / h]
Computation and selection capacity tables - SI units
Table 3: HFI 040 - R 717, evaporating capacity [kW]
© Danfoss | Climate Solutions | 2021.09 AI220786430153en-001101 | 5
Condens‐
ing temp.
(°C)
Evaporating temperature (°C)
–40
–35
–30
–25
–20
–15
–10–505101520
50
45
40
35
955
920
880
845
955
920
880
845
955
920
880
840
955
915
875
835
950
910
870
825
945
905
860
815
935
895
850
800
925
880
830
780
910
860
810
755
890
835
780
720
865
805
745
680
830
770
700
625
790
725
645
560
30
25
20
15
805
765
720
675
800
760
715
670
800
755
705
660
790
745
695
645
780
730
680
630
765
715
660
605
750
695
635
570
725
665
600
530
695
630
555
480
655
580
500
405
605
520
420
295
540
440
310
455
320
10
5
0
–5
–10
630
585
540
490
440
625
575
525
475
420
610
560
505
455
395
595
540
485
425
360
570
515
450
385
305
545
480
405
325
230
505
430
345
240
455
365
255
385
270
285
Condens‐
ing temp.
(°C)
Evaporating temperature (°C)
–40
–35
–30
–25
–20
–15
–10–505101520
50
45
40
35
1430
1380
1325
1265
1435
1380
1325
1265
1435
1380
1320
1260
1430
1375
1315
1250
1425
1370
1305
1240
1420
1360
1290
1220
1405
1340
1270
1200
1385
1320
1245
1170
1365
1290
1215
1130
1335
1255
1170
1080
1295
1210
1120
1020
1245
1155
1055
940
1190
1085
970
840
30
25
20
15
1205
1145
1080
1015
1205
1140
1070
1005
1195
1130
1060
990
1185
1115
1045
970
1170
1100
1020
940
1150
1075
990
905
1120
1040
950
860
1085
995
900
795
1040
940
835
715
980
870
750
605
905
780
635
445
810
660
465
685
485
10
5
0
–5
–10
945
875
805
735
660
935
860
785
710
635
915
840
760
680
595
890
810
725
635
540
860
770
675
575
460
815
720
610
490
340
755
645
520
360
680
550
380
580
405
425
Condens‐
ing temp.
(°C)
Evaporating temperature (°C)
–40
–35
–30
–25
–20
–15
–10–505101520
50
45
40
35
2445
2680
2545
2400
2775
2640
2490
2335
2725
2580
2425
2260
2665
2510
2340
2160
2590
2420
2235
2035
2495
2310
2105
1880
2375
2170
1940
1680
30
25
20
15
2090
1940
2340
2195
2040
1885
2300
2145
1980
1810
2245
2080
1900
1715
2170
1995
1800
1595
2080
1885
1670
1435
1960
1745
1500
1210
1815
1565
1265
890
1625
1320
930
1370
965
10
5
0
–5
–10
1470
1325
1725
1575
1425
1265
1835
1680
1520
1360
1190
1785
1620
1450
1270
1080
1715
1540
1350
1150
920
1630
1435
1220
980
685
1515
1295
1040
725
1365
1100
765
1160
810
850
Condens‐
ing temp.
(°F)
Evaporating temperature (°F)
–40
–30
–20
–10010203040506070
80
120
110
100
90
134
129
123
117
135
129
123
117
135
129
122
116
134
128
122
115
134
127
120
113
132
126
118
111
131
123
116
107
128
121
112
103
125
117
108
98
121
112
102
91
116
106
94
81
109
98
84
69
101
87
71
50
80
70
60
50
110
103
97
90
110
103
96
88
109
102
94
86
107
100
92
83
105
97
89
80
102
94
84
74
99
89
79
67
94
83
71
57
87
75
60
42
78
63
44
66
47
49
40
30
20
10
82
75
67
59
81
73
65
56
78
70
61
51
75
65
55
44
70
59
47
33
63
51
35
54
38
40
Float valve, type HFI
Table 4: HFI 050 - R 717, evaporating capacity [kW]
Table 5: HFI 060 - R 717, evaporating capacity [kW]
Table 6: HFI 070 - R717, evaporating capacity [kW]
Table 7: HFI 040 - R 717, evaporating capacity [TR]
© Danfoss | Climate Solutions | 2021.09 AI220786430153en-001101 | 6
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