Danfoss SCA-X SS 15 - 40, CHV-X SS 15 - 40 Data sheet
Data Sheet
Check & stop valve, type SCA-X SS
Check valve, type CHV-X SS
Assures precision in harsh operating surroundings
In certain specic areas such as outdoor
applications and corrosive atmospheres, such
as coastal installations, there is a need for high
surface protection to prevent failure due to
corrosion.
Today's food safety standards often call for daily
treatment with detergents to protect against
bacteria growth, again producing a need for
high surface protection.
SCA-X SS are check valves with a built-in stop
valve function. CHV-X SS are check valves only.
The valves are designed to open at very low
dierential pressures, allow favourable ow
conditions and are easy to disassemble for
inspection and service.
The valve cone has a built-in exibility to
ensure a precise and tight closing towards the
valve seat.
A well balanced dampening eect between the
piston and the cylinder gives an optimal
protection during low loads and against
pulsations.
AI234986440164en-000701
Check & stop valve, type SCA-X SS and Check valve, type CHV-X SS
Features
• Applicable to HCFC, HFC, R717 (Ammonia), R744 (CO2), Propane, Butane, Iso-Butane and Ethane.
◦ R717 Heat Pump and Propylene applications with replaced O-ring.
• Designed to give favourable ow conditions.
• Internal backseating enables replacement of the spindle seal whilst the valve is active, i.e. under pressure (SCA-SS)
• Housing is made of special cold resistant stainless steel approved for low temperature operations.
• Easy to disassemble for inspection and service.
• Butt-weld DIN and ANSI connections.
• Max. operating pressure: 52 bar g (754 psig)
• Temperature range: –60/+150°C (–76 +302°F).
• Compact and light valves for easy handling and installation.
• Classication: DNV, CRN, BV, EAC etc. To get an updated list of certication on the products please contact your
local Danfoss Sales Company.
© Danfoss | Climate Solutions | 2021.02 AI234986440164en-000701 | 2
Check & stop valve, type SCA-X SS and Check valve, type CHV-X SS
Media
Refrigerants
Applicable to HCFC, HFC, R717 (Ammonia), R744 (CO2), Propane, Butane, Iso-Butane and Ethane. R717 Heat Pump
and Propylene applications with replaced O-ring.
For further information refer to the installation guide for SCA-X SS/CHV-X SS.
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 | 2021.02 AI234986440164en-000701 | 3
-70 -50 -30 -10 10 30 50 70 90 110 130 150
-94 -58 -22 14 50 86 122 158 194 230 266 302
˚C
˚F
0
73
145
218
290
363
435
508
580
653
725
798
psi
0
5
10
15
20
25
30
35
40
45
50
55
bar
Temperature
Pressure
SCA-X SS/CHV-X SS DN15-DN40
Description
Values
Temperature range
-60 °C/+150 °C (-76 °F/+302 °F)
Max. working pressure
52 bar (754 psig)
Check & stop valve, type SCA-X SS and Check valve, type CHV-X SS
Product specication
Pressure and temperature range
Figure 1: Pressure and temperature range graph
Table 1: Pressure and temperature
Design
Housing
Made of stainless steel approved for low temperature operations.
Valve cone
Valve cone with built in metallic stop - prevents damage to teon ring in case of overtightening.
Damping chamber
The chamber is lled with refrigerants (gas or liquid), which provides a damping eect when the valve opens and
closes.
Spindle (SCA-X SS)
Made of polished stainless steel, which is ideal for O-ring sealing.
Packing Gland (SCA-X SS)
The “full temperature range” packing gland is the standard for the entire SVL platform.
This ensures perfect tightness throughout the whole temperature range: -60 °C/+150 °C (-76 °F/+302 °F).
Installation
The valve must be mounted vertically with the cone downwards.
The valve is designed to resist very high internal pressure. However, the piping system in general should be
designed to avoid liquid traps and reduce the risk of hydraulic pressure caused by thermal expansion.
For further information refer to installation guides for SCA-X SS/CHV-X SS.
If cold refrigeration oil having low viscosity enters and settles in the damping chamber, problems with the check
valve may arise. Consequently, it may be necessary to modify the valve for more viscous liquids by enlarging the
hole to the damping chamber.
© Danfoss | Climate Solutions | 2021.02 AI234986440164en-000701 | 4
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