Danfoss SV 4, SV 5, SV 6 Data sheet
Data Sheet
Float valve
Type SV 4, SV 5 and SV 6
Liquid level regulators in refrigeration, freezing and air conditioning systems
SV 4, SV 5 and SV 6 are for use on the low pressure side as modulating liquid level regulators in refrigeration, freezing and air conditioning systems with ammonia and other common types of refrigerants.
Features:
• Reliable function
• Stable regulation, even during momentary load change
• Liquid injection into the float housing or directly into the evaporator through external pipe connection
• Orifice assembly and filter can be replaced without evacuating the float housing
• Can be supplied without float housing for direct installation in the system (special order only)
• Can be used as pilot float for PMLF if mounted with special orifice (diameter Ø2.5 mm)
• Classification: DNV, CRN, BV, EAC etc. To get an updated list of certification on the products please contact your local Danfoss Sales Company.
AI175286419654en-000601
Float valve, Type SV 4, SV 5 and SV 6
Applications
The liquid expands into the €oat housing
NOTE: |
Direct liquid injection into the float housing 4 pcs. M6 screws (pos. 23) are removed, and pos. 24 remains blanked o„. This leaves four holes through which liquid expands directly.
If the capacity is too high, only remove two or three screws. Pos. 23 and 24, see .Table 7
The liquid expands into the €oat housing
NOTE: |
4 pcs. M6 screws (pos. 23) are removed, and pos. 24 remains blanked o„. This leaves four holes through which liquid expands directly.
If the capacity is too high, only remove two or three screws. Pos. 23 and 24, see Table 7
The liquid expands into the evaporator
NOTE: |
Pos. 23 and 24, see Table 7
Used in large evaporators with long pipe lines.
pos. 24 is removed and weld connection is mounted pos. 23 remains screwed
© Danfoss | Climate Solutions | 2021.02 |
AI175286419654en-000601 | 2 |
Float valve, Type SV 4, SV 5 and SV 6
The liquid expands directly into the surge drum
NOTE: |
4 pcs. M6 screws (pos. 23) are removed, and pos. 24 remains blanked o„. This leaves four holes through which liquid expands directly.
If the capacity is too high, only remove two or three screws. Pos. 23 and 24, see Table 7
Media
Refrigerants
Applicable to HCFC, HFC and R717 (Ammonia). Use with flammable hydrocarbons cannot be recommended; please contact Danfoss.
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 specific refrigerants are best checked at store.danfoss.com/en/, or by contacting your local Danfoss representative.
© Danfoss | Climate Solutions | 2021.02 |
AI175286419654en-000601 | 3 |
Float valve, Type SV 4, SV 5 and SV 6
Product speci€cation
Pressure and temperature data
Table 1: Pressure and temperature data
Description |
Values |
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|
P band |
Approx. 35 mm |
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Max. working pressure |
MWP = 28 bar |
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|
SV 4 = 23 bar |
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Max. Δp |
SV 5 = 21 bar |
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|
SV 6 = 19 bar |
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Media temperature |
-50 °C to 120 °C |
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Max. test pressure |
MTP = 32 bar |
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SV 4: k |
v |
= 0.23 m3/h D = 3.0 mm |
kv value and diameter for ori‚ce |
SV 5: kv = 0.31 m3/h D = 3.5 mm |
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|
SV 6: k |
v |
= 0.43 m3/h D = 4.0 mm |
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|
|
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Identi‚cation
Figure 1: Identi€cation
Materials |
•Gaskets are non asbestos
•Valve housing made of lowtemperature cast iron, spherical (EN-GJS-400-18-LT)
•Float housing: ST 35.8 DIN 17175 W. no. 1.0305
Dimensioning example for SV
Table 2:
Description |
Values |
Refrigerant |
R717 (NH3) |
Evaporating capacity |
Qe = 145 kW |
Evaporating temperature |
te = -10 °C (~ pe = 2.9 bar abs.) |
Condensing temperature |
tc = +30 °C (~ pc = 11.7 bar abs.) |
Liquid temperature ahead of SV |
tl = +20 °C |
Subcooling |
Δtsub = tc − tl = 30 °C − 20 °C = 10 K |
Pressure drop in SV |
Δp = pc − pe = 11.7 − 2.9 = 8.8 bar |
Correction factor k for 10 K subcooling |
= 0.98 |
Corrected capacity |
145 × 0.98 = 142 kW |
|
|
NOTE:
At te = -10 °C and Δp = 8 bar SV 5 yields 147 kW and can therefore be used.
Capacity
The values in the capacity tables are based on a subcooling of 4 K just ahead of the SV valve. If the subcooling is more or less than 4 K, refer to the following correction factors.
© Danfoss | Climate Solutions | 2021.02 |
AI175286419654en-000601 | 4 |
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