Danfoss REG-SA SS, REG-SB SS Data sheet

Data Sheet

Hand operated regulating valve
Type REG-SA SS and REG-SB SS

Assures favorable ow characteristics 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.

REG-SA SS and REG-SB SS are angle-way and
straight-way hand-operated regulating valves,
which act as normal stop valves in closed
position.

The valves are designed to meet the strict
quality requirements on refrigerating
installations specied by the international
classication societies and are carefully
designed to present favourable ow conditions
and accurate linear characteristics.

The valves are equipped with vented cap and
have internal backseating enabling the spindle
seal to be replaced with the valve still under
pressure.

AI234986440271en-000601

Hand operated regulating valve, type REG-SA SS and REG-SB 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

• 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 (754 psig)

• Temperature range: -60 °C / +150 °C (-76 °F / +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.

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Hand operated regulating valve, type REG-SA SS and REG-SB SS

Media

Refrigerants

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

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-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

REG-SA SS/REG-SB SS DN15-DN40

Hand operated regulating valve, type REG-SA SS and REG-SB SS

Product specication

Pressure and temperature range

Figure 1: Pressure and temperature range graph

Design

Housing

Made of stainless steel approved for low temperature operations.

The cone

The valves are available in two dierent versions – REG-SA SS with an A cone and REG-SB SS with a B cone. The A
cone is designed for expansion lines, while the B cone is designed for regulating purposes e.g. liquid lines.

The valve cone is designed to ensure perfect regulation and provide an extensive regulating area. Irrespective of the
refrigerant used, it is easy to obtain the correct capacity. A cone seal ring provides perfect sealing at a minimum
closing momentum.

The valve cone can be turned on the spindle, thus there will be no friction between the cone and the seat when the
valve is opened and closed.

Made of polished stainless steel, ideal for O-ring sealing. Furthermore, parts of the spindle are heat treated to obtain
anti-abrasive/adhesive properties.

Packing gland - REG-SA SS and REG-SB SS

The stainless steel packing gland comprises a spring loaded seal packing gland which ensures a perfect tightness in
the range: -60 °C / +150 °C (-76 °F / +302 °F).

The packing glands are equipped with a scraper ring to prevent penetration of dirt and ice into the packing gland.

Installation

Install the valve with the spindle up or in horizontal position. The ow must be directed towards the cone.

The valve is designed to withstand 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 guide for REG-SA SS and REG-SB SS.

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R

E

G

U

L

A

T

I

N

G

V

A

L

V

E

R

E

G

-

S

A

S

S

Description

Values

Temperature range

-60 °C - +150 °C (-76 °F -+302°F)

Max working pressure

52 bar (754 psig)

T

ØD

Danfoss

A148B15.10

Size

OD

T

15mm21.3

2.3½in.

0.839

0.09120mm

26.9

2.3¾in.

1.059

0.09125mm

33.7

2.61in.

1.327

0.10332mm

42.4

2.61¼in.

1.669

0.10240mm

48.3

2.61½in.

1.902

0.103

Hand operated regulating valve, type REG-SA SS and REG-SB SS

Figure 2: Example of marking ring, REG-SA SS

Pressure and temperature data

Table 1: Pressure and temperature

Flow coecients

Flow coecients for fully opened valves from kv = 0.15 to 80 m3/h (Cv = 0.17 to 92.5 USgal/min).

Connections

Available with the following connections:
Butt-weld DIN (EN 10220): DN 15 - 40 (½ - 1½ in.)
Butt-weld ANSI (B 36.19M): DN 15 - 40 (½ - 1½ in.)

Figure 3: DIN

Table 2: Butt-weld DIN (EN 10220)

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T

ØD

Size

OD

T

15mm21.3

2.8½in.

0.839

0.1120mm

26.9

2.9¾in.

1.06

0.1125mm

33.7

3.51in.

1.33

0.1432mm

42.4

3.61¼in.

1.67

0.1440mm

48.3

3.71½in.

1.9

0.15

Hand operated regulating valve, type REG-SA SS and REG-SB SS

Figure 4: ANSI

Table 3: Butt-weld ANSI (B 36.19M, SCHEDULE 40)

Computation and selection

Introduction

In refrigeration plants, regulating valves are primarily used in liquid lines in order to regulate the ow of refrigerant.
The valves can, however, also be used as expansion valves. From a calculation point of view the two elds of
application are very dierent.

Normal ow is the term used to describe the general case where the ow through the valve is proportional to the
square root of the pressure drop across it and inversely proportional to the density of the refrigerant (Bernouillis
equation).

Sizing regulating valve for liquid ow Liquid refrigerants: Use the liquid tables, Figure 12: Flow rate

diagramCalculation factor CA, Figure 12: Flow rate diagramCalculation factor CA, Figure 13: Flow rate diagram. For

other refrigerants and brines, "Normal ow" (Turbulent ow); see below and use the ow coecient tables (Figure 6:

REG-SA SS 15-20 and REG-SB SS 15-20 and Figure 7: REG-SA SS 25-40 and REG-SB SS 25-40).

This relationship between mass ow, pressure drop and density satises the majority of all valve applications with
refrigerants and brines.

Normal ow is characterised by turbulent ow through the valve without any phase change. The following capacity
curves are based on the above mentioned assumption.

Application of the regulating valves outside the normal ow area will reduce the capacity of the valve considerably.
In such cases it is recommended to use "DIRcalc™" (Danfoss Industrial Refrigeration calculation programme).

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