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 specic 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 dierential 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 eect 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.

• 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.

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

-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

145

218

290

363

435

508

580

653

725

798

psi

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 specication

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 teon ring in case of overtightening.

Damping chamber

The chamber is lled with refrigerants (gas or liquid), which provides a damping eect 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.

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