Danfoss HFI 040 FD, HFI 050 FD, HFI 060 FD, HFI 070 FD, HFI Data sheet

Data Sheet

Float valve

Type HFI

Robust and reliable solution for high pressure control

HFI is a high pressure float valve with internal liquid measuring device. The float valve is designed for direct flange mounting or welding on to plate heat exchanger type condensers, as illustrated in Figure 1: Plate heat exchanger

HFI is direct acting, therefore no differential pressure is required to activate the valve.

HFI is robust and reliable due to its simple design. The float 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 flange 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 flange are made of special steel approved for low temperature application

•Classi„cation: DNV, CRN, BV, EAC etc. To get an updated list of certi„cation on the products please contact your local Danfoss Sales Company.

Figure 1: Plate heat exchanger

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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 speci„c refrigerants are best checked at store.danfoss.com/en/, or by contacting your local Danfoss representative.

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Float valve, type HFI

Product specification

Design

Housing

Housing i.e. shell and flange is made of special steel approved for low temperature operation.

Installation

Refer to installation instruction for HFI.

Figure 2: Identification:

Pressure and temperature data

Table 1: Pressure and temperature

	Description	Values
	Temperature range	-50 °C / +80 °C (–58 °F /+176 °F)
	The float valve is designed for: Maximum operating pressure	Housing PED 28 bar (407 psig)
		Ball (float) 25 bar (363 psig)

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 effective 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 float valve.

When capacity demands increase, the liquid level in the float 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 off 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 de„ned 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.

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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 float valve at various operating conditions.

Select a valve using the speci„c 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 float 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

	Nominal capacity
Valve type	[kW]	Valve constant [K]
	(R 717, –10/+35°C)
HFI 040 FD	400	16.79
HFI 050 FD	800	33.58
HFI 060 FD	1200	50.36
HFI 070 FD	2400	100

Mass flow

G = K Δp × ρ

[kg / h]

Δp differential pressure [bar]

ρdensity of liquid [kg/m3]

K valve constant (from the above table)

Computation and selection capacity tables - SI units

Table 3: HFI 040 - R 717, evaporating capacity [kW]

	Condens						Evaporating temperature (°C)
	ing temp.	–40	–35	–30	–25	–20	–15	–10	–5	0	5	10	15	20
	(°C)
	50	475	480	480	475	475	475	470	460	455	445	430	415	395
	45	460	460	460	460	455	455	445	440	430	420	405	385	360
	40	440	440	440	440	435	430	425	415	405	390	375	350	325
	35	420	420	420	415	415	405	400	390	375	360	340	315	280
	30	400	400	400	395	390	385	375	360	345	325	300	270
	25	380	380	375	370	365	360	345	330	315	290	260		230
													220
	20	360	355	355	350	340	330	315	300	280	250	210		160
													155
	15	340	335	330	325	315	300	285	265	240	200	150
	10	315	310	305	295	285	270	250
	5	290	285	280	270	255	240		225
								215		195
	0	270	260	255	240	225	205		185		140
								175		135
	–5	245	235	225	210	190	165		125
								120
	–10	220	210	200	180	155	115

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Float valve, type HFI

Table 4: HFI 050 - R 717, evaporating capacity [kW]

	Condens						Evaporating temperature (°C)
	ing temp.	–40	–35	–30	–25	–20	–15	–10	–5	0	5	10	15	20
	(°C)
	50	955	955	955	955	950	945	935	925	910	890	865	830	790
	45	920	920	920	915	910	905	895	880	860	835	805	770	725
	40	880	880	880	875	870	860	850	830	810	780	745	700	645
	35	845	845	840	835	825	815	800	780	755	720	680	625	560
	30	805	800	800	790	780	765	750	725	695	655	605	540
	25	765	760	755	745	730	715	695	665	630	580	520		455
													440
	20	720	715	705	695	680	660	635	600	555	500	420		320
													310
	15	675	670	660	645	630	605	570	530	480	405	295
	10	630	625	610	595	570	545	505
	5	585	575	560	540	515	480		455
								430		385
	0	540	525	505	485	450	405		365		285
								345		270
	–5	490	475	455	425	385	325		255
								240
	–10	440	420	395	360	305	230

Table 5: HFI 060 - R 717, evaporating capacity [kW]

	Condens						Evaporating temperature (°C)
	ing temp.	–40	–35	–30	–25	–20	–15	–10	–5	0	5	10	15	20
	(°C)
	50	1430	1435	1435	1430	1425	1420	1405	1385	1365	1335	1295	1245	1190
	45	1380	1380	1380	1375	1370	1360	1340	1320	1290	1255	1210	1155	1085
	40	1325	1325	1320	1315	1305	1290	1270	1245	1215	1170	1120	1055	970
	35	1265	1265	1260	1250	1240	1220	1200	1170	1130	1080	1020	940	840
	30	1205	1205	1195	1185	1170	1150	1120	1085	1040	980	905	810
	25	1145	1140	1130	1115	1100	1075	1040	995	940	870	780		685
													660
	20	1080	1070	1060	1045	1020	990	950	900	835	750	635		485
													465
	15	1015	1005	990	970	940	905	860	795	715	605	445
	10	945	935	915	890	860	815	755
	5	875	860	840	810	770	720		680
								645		580
	0	805	785	760	725	675	610		550		425
								520		405
	–5	735	710	680	635	575	490		380
								360
	–10	660	635	595	540	460	340

Table 6: HFI 070 - R717, evaporating capacity [kW]

	Condens						Evaporating temperature (°C)
	ing temp.	–40	–35	–30	–25	–20	–15	–10	–5	0	5	10	15	20
	(°C)
	50							2680	2775	2725	2665	2590	2495	2375
	45								2640	2580	2510	2420	2310	2170
							2445	2545
	40								2490	2425	2340	2235	2105	1940
								2400
	35								2335	2260	2160	2035	1880	1680
	30					2340	2300	2245	2170	2080	1960	1815	1625
	25				2090	2195	2145	2080	1995	1885	1745	1565		1370
													1320
	20				1940	2040	1980	1900	1800	1670	1500	1265		965
													930
	15					1885	1810	1715	1595	1435	1210	890
	10		1725	1835	1785	1715	1630	1515
	5			1680	1620	1540	1435		1365
		1470	1575					1295		1160
	0			1520	1450	1350	1220		1100		850
		1325	1425					1040		810
	–5			1360	1270	1150	980		765
			1265					725
	–10			1190	1080	920	685

Table 7: HFI 040 - R 717, evaporating capacity [TR]

	Condens						Evaporating temperature (°F)
	ing temp.	–40	–30	–20	–10	0	10	20	30	40	50	60	70	80
	(°F)
	120	134	135	135	134	134	132	131	128	125	121	116	109	101
	110	129	129	129	128	127	126	123	121	117	112	106	98	87
	100	123	123	122	122	120	118	116	112	108	102	94	84	71
	90	117	117	116	115	113	111	107	103	98	91	81	69	50
	80	110	110	109	107	105	102	99	94	87	78
	70	103	103	102	100	97	94	89	83	75		66
											63		49
	60	97	96	94	92	89	84	79	71	60		47
											44
	50	90	88	86	83	80	74	67	57	42
	40	82	81	78	75	70	63
	30	75	73	70	65	59		54
							51		40
	20	67	65	61	55	47		38
							35
	10	59	56	51	44	33

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