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.
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.
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.
Figure 3: Detail A Fully closedFigure 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]
The HFI-valves are approved in accordance with the European standard specied in the Pressure Equipment Directive and are CE marked.
HFI valves
Nominal bore
DN 100 and 150 mm (4 in. and 6 in.)
Classied for
Fluid group I
Catagory
III
File name
Document type
Document topic
Approval authority
RU Д-DK.БЛ08.В.00191_18
EAC Declaration
Machinery & Equipment
EAC
03709-F0 BV
Marine - Safety Certicate
-BVRU Д-DK.РА01.B.72054_20
EAC Declaration
PED
EAC
RU C-DK.БЛ08.B.01093_20
Pressure - Safety Certicate
PED
EAC
033F0685.AK
EU Declaration
EMCD/PED
Danfoss
033F0691.AE
Manufacturers Declaration
RoHS
Danfoss
0045 202 1204 Z 00355 19 D 001(00)
Pressure - Safety Certicate
-
TÜV
033F0473.AD
Manufacturers Declaration
ATEX
Danfoss
19.10327.266
Marine - Safety Certicate
-
RMRS
Float valve, type HFI
Certicates, declarations, and approvals
The list contains all certicates, declarations, and approvals for this product type. Individual code number may have
some or all of these approvals, and certain local approvals may not appear on the list.
Some approvals may change over time. You can check the most current status at danfoss.com or contact your local
Danfoss representative if you have any questions.
Table 25: Pressure Equipment Directive (PED)
For further details / restrictions - see Installation Instruction
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