w characteristics and accurate linear characteristics
REG-SA and REG-SB are angleway and
aightway hand operated regulating valves,
str
which act as normal shut-o valves in closed
position.
The valves are available in two dierent
versions – REG-SA and REG-SB designed for
regulation purposes in liquid and expansion
lines.
The valves are designed to meet the strict
quality requirements on refrigerating
installations specied by the international
classication societies and are carefully
designed to present favourable ow conditions
and accurate linear characteristics.
REG-SA and REG-SB are equipped with vented
cap and internal backseating enables
replacement of the spindle seal whilst the valve
is active, i.e. under pressure.
AI189386433903en-02
1201
Hand operated regulating valve, type REG-SA and REG-SB 10-65
Features
• Applicable to HCFC, HFC, R717 (Ammonia), R744 (CO2), P
• R717 Heat Pump and Propylene applications with replaced O-ring.
• Modular Concept:
◦ Each valve housing is available with several dierent connection types and sizes.
◦ Possible to convert REG-SA or REG-SB to any other product in the FlexlineTM SVL family (shut-o valve, check &
stop valve, check valve or strainer) just by replacing the complete top part.
• Fast and easy valve overhaul service. It is easy to replace the top part and no welding is needed.
• Designed to ensure perfect regulation
• Internal backseating enables replacement of the spindle seal whilst the valve is active, i.e. under pressure.
• Easy to disassemble for inspection and possible repair.
• Long neck versions (DN 15 to DN 40) for insulated systems available from parts programme.
• Max. operating pressure: 52 bar (754 psig)
• Temperature range: -60 °C to +150 °C (-76 °F to +302 °F)
• Acts as a normal shut-o valve in closed position.
• Housing and bonnet material is low temperature steel according to requirements of the Pressure Equipment
Directive and other international classication authorities.
• Exact capacity and setting of the valve can be calculated for all refrigerants by means of Coolselector®2 (Danfoss
calculation and selection software).
• Classication: DNV, CRN, BV, EAC etc. To get an updated list of certication on the products please contact your
local Danfoss Sales Company.
Hand operated regulating valve, type REG-SA and REG-SB 10-65
Media
Refrigerants
pplicable to HCFC, HFC, R717 (Ammonia), R744 (CO2), Propane, Butane, Iso-Butane and Ethane.
A
R717 Heat Pump and Propylene applications with replaced O-ring.
New refrigerants
oss products are continually evaluated for use with new refrigerants depending on market requirements.
Danf
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.
Hand operated regulating valve, type REG-SA and REG-SB 10-65
Product specication
Design
ousing
H
Housing is Standard SVA angleway or straightway housing allowing other inserts from the SVL platform to be
installed.
Material is special, cold resistant steel
The cone
The valves are available in two dierent versions – REG-SA with an A cone and REG-SB 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.
Spindle
The spindle is made of polished stainless steel, which is ideal for O-ring sealing.
Packing gland - REG-SA and REG-SB
The “full temperature range” packing gland ensures perfect tightness in the whole 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.
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 product instruction for REG-SA and REG-SB.
Liquid line without phase changeLiquid line with or without phase change
REG
Wet suction line
Dry suction line
Hot gas by-pass & defrost line
Dischargeline
Hand operated regulating valve, type REG-SA and REG-SB 10-65
Table 7: FPT inside pipe thread, NPT (ANSI/ASME B 1.20.1)
Computation and selection
ntroduction
I
In refrigeration plants, hand operated 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 dierent.
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).
This relationship between mass ow, pressure drop and density satises 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 hand operated regulating valves outside the normal ow area will reduce the capacity of the
valve considerably. In such cases it is recommended to use Coolselector®2 (Danfoss calculation and selection
software).
Figure 7: Location of valve in system (marked with grey)
Sizing hand operated regulating valve for liquid o
w
Liquid refrigerants: Use the liquid tables, Figure 13: REG-SA 10 and REG-SB 10, Figure 14: REG-SA 15-20 and REG-SB
15-20, Figure 15: REG-SA 25-40 and REG-SB 25-40, Figure 16: REG-SB 50, Figure 17: REG-SB 65. For other refrigerants
and brines, "Normal ow" (Turbulent ow); see below and use the owcoecient tables (Figure 8: REG-SA 10 and
Hand operated regulating valve, type REG-SA and REG-SB 10-65
The above mentioned example is illustrated on the following o
w rate diagram and shows that REG-SB 15 and 20
with cone B can be used. The main rule is that nominal regulation range should be below 85% opening degree. If
the arrowline is crossing 2 cone curves, the smaller cone should be selected if opening degree < 85%.
The example is only correct if the density of the refrigerant is approx. 670 (kg/m3), and there must be no build-up of
ash gas in the valve.
Figure 19: Flow rate diagram
Computation and selection Example 2
Br
ine, density ρ: 1150 [kg/m3]
Brine ow G: 2,700 [kg/h]
Pressure drop Δp: 0.5 [bar]
In this example it is not possible to use the selection diagrams (Figure 13: REG-SA 10 and REG-SB 10, Figure 14: REG-
SA 15-20 and REG-SB 15-20, Figure 15: REG-SA 25-40 and REG-SB 25-40, Figure 16: REG-SB 50, Figure 17: REG-SB 65)
as the refrigerant in question is not included.
Use the curves of the kv-values instead (Figure 8: REG-SA 10 and REG-SB 10, Figure 9: REG-SA 15-20 and REG-SB
15-20, Figure 10: REG-SA 25-40 and REG-SB 25-40, Figure 11: REG-SB 50, Figure 12: REG-SB 65) and calculate the
required kv by means of the formulas in the "Introduction" passage at the beginning of this chapter. Alternatively
calculate the kv-values by means of the calculation factor CA (Figure 20: Calculation factor CA) and the ow rate
diagram (in this example: Figure 21: Flow rate diagram) as per the following calculation example.
Required kv-value
CA = 0.00132 (from Figure 20: Calculation factor CA)
kv = CA × G
kv = 0.00132 × 2,700 [kg/h]
= 3.56 [m3/h]
Hand operated regulating valve, type REG-SA and REG-SB 10-65
Ordering
ow to order
H
The table below is used to indentify the valve required.
Please note that the type codes only serve to identify the valves, some of which may not form part of the standard
product range. For further information please contact your local Danfoss Sales Company.
Table 11: Type codes
Table 12: Available combination between valve size, cone type and valve connection
REG valves are approved according to the European standard specied in the P
ressure Equipment Directive and are CE
marked.
REG-SA and REG-SB valves
Nominal bore
DN = < 25 mm (1 in.)
DN32-80 mm (1¼ - 3 in.)
DN100 - 125 mm (4 - 5 in.)
Classied f
or
Fluid group I
Category
Article 3, paragraph 3
II
III
File name
Document type
Document topic
Approval authority
BV 03709-F0 BV
Marine - Safety C
erticate
-BVTAP0000002 Rev. 2
Marine - Safety C
erticate
-
DNV GL
033F0685.AK
EU Declaration
EMCD/PED
Danfoss
033F0691.AE
Manufacturers Declaration
RoHS
Danfoss
RMRS 19.10048.266
Marine - Safety C
erticate
-
RMRS
Hand operated regulating valve, type REG-SA and REG-SB 10-65
Certicates, declar
ations, and approvals
The list contains all certicates, declarations, and approvals for this product type. Individual code number may have
some or all of these approvals, and certain local approvals may not appear on the list.
Some approvals may change over time. You can check the most current status at danfoss.com or contact your local
Danfoss representative if you have any questions.
oss oers a wide range of support along with our products, including digital product information, software,
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