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 oat housing or
directly into the evaporator through external
pipe connection

• Orice assembly and lter can be replaced
without evacuating the oat housing

• Can be supplied without oat housing for
direct installation in the system (special order
only)

• Can be used as pilot oat for PMLF if
mounted with special orice (diameter Ø2.5
mm)

• 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.

AI175286419654en-000601

Direct liquid injection into the oat housing 4 pcs. M6

screws (pos. 23) are removed, and pos. 24 remains

blanked o. This leaves four holes through which liquid

expands directly.

4 pcs. M6 screws (pos. 23) are removed, and pos. 24 remains

blanked o. This leaves four holes through which liquid

expands directly.

Used in large evaporators with long pipe lines.

pos. 24 is removed and weld connection is mounted

pos. 23 remains screwed

Float valve, Type SV 4, SV 5 and SV 6

Applications

The liquid expands into the oat housing

NOTE:



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:

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

© Danfoss | Climate Solutions | 2021.02 AI175286419654en-000601 | 2

4 pcs. M6 screws (pos. 23) are removed, and pos. 24 remains

blanked o. This leaves four holes through which liquid

expands directly.

Float valve, Type SV 4, SV 5 and SV 6

The liquid expands directly into the surge drum

 NOTE:

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

© Danfoss | Climate Solutions | 2021.02 AI175286419654en-000601 | 3

Description

Values

P band

Approx. 35 mm

Max. working pressure

MWP = 28 bar

Max. Δp

SV 4 = 23 bar
SV 5 = 21 bar
SV 6 = 19 bar

Media temperature

-50 °C to 120 °C

Max. test pressure

MTP = 32 bar

kv value and diameter for orice

SV 4: kv = 0.23 m3/h D = 3.0 mm
SV 5: kv = 0.31 m3/h D = 3.5 mm
SV 6: kv = 0.43 m3/h D = 4.0 mm

Description

Values

Refrigerant

R717 (NH

3

)

Evaporating capacity

Q

e

= 145 kW

Evaporating temperature

t

e

= -10 °C (~ pe = 2.9 bar abs.)

Condensing temperature

t

c

= +30 °C (~ pc = 11.7 bar abs.)

Liquid temperature ahead of SV

t

l

= +20 °C

Subcooling

Δtsub = t

c

− tl = 30 °C − 20 °C = 10 K

Pressure drop in SV

Δp = p

c

− pe = 11.7 − 2.9 = 8.8 bar

Correction factor k for 10 K subcooling

= 0.98

Corrected capacity

145 × 0.98 = 142 kW

Float valve, Type SV 4, SV 5 and SV 6

Product specication

Pressure and temperature data

Table 1: Pressure and temperature data

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:



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