Danfoss SFV 20, SFV 25 Data sheet

Data Sheet

Safety relief valve Type SFV 20-25

Designed for protection of vessels and other components against excessive pressure

SFV 20 - 25 are standard, back pressure dependent safety relief valves in angle-way execution, specially designed for protection of vessels and other components against excessive pressure.

The valve is designed to meet the strict quality demands and safety requirements for refrigeration installations, specied by the international classication societies.

The valve is recommended as an external and internal safety relief valve in refrigeration plants. The spring housing is closed tightly to avoid refrigerant leakage.

The inlet ow diameters of the valves are:

• 18 mm (

• 23 mm (1 in.) for SFV 25

The valves can be delivered with set pressures between 10 and 25 bar (145 and 363 psig).

Standard pressure setting valves having "TÜV Pressure Setting Certicate" with each valve, are also available.

Features

• Applicable for the refrigerants HCFC, HFC, R717 (Ammonia), R744 (CO2) within a

temperature range of –30°C / +100°C (–22°F / +212°F).

• 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.

3

⁄4 in.) for SFV 20

AI175286423559en-000701

Safety relief valve, Type SFV 20-25

Media

Refrigerants

Applicable for the refrigerants HCFC, HFC, R717 (Ammonia), R744 (CO2) within a temperature range of -30 °C/+100 °C (-22 °F/+212 °F)

• Flammable hydrocarbons are not recommended.

• 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.

The SFV-valves are approved in accordance with the European standard

specied in the Pressure Equipment Directive and are CE

marked. For further details / restrictions - see Installation Instruction.

SFV valves

Nominal bore

18 mm (0.709 in.)

23 mm (0.906 in.)

Classied

for

Fluid group I

Category

IV

Safety relief valve, Type SFV 20-25

Product specication

Pressure and temperature data

• Pressure Pressure setting range: 10 - 25 bar (145 - 363 psig). For further information please contact your local Danfoss Sales Company. The valves are designed for: Strength test:

◦ 43 bar (624 psig)

• Leakage safety Same as set pressure.

IMPORTANT:



The SFV safety relief valve is dependent on the back pressure (if the back pressure is higher than the atmospheric pressure, the opening pressure will be higher than stated set pressure). Special circumstances such as vibrations (which should be avoided) and oscillating pressure may require an increased dierence between the operational pressure and the closing pressure.

• Pressure setting The operating pressure of the plant should be at least 15% below the set pressure. This allows a perfect re-seating of the safety relief valve after having been activated.

• Temperature range : –30 °C/+100 °C (–22/+212 °F)

Design

Housing

Made of special steel approved for low temperature operation. Spindle and seat are made of stainless steel, to ensure precise operation even during extraordinary conditions. The gasket of the valve cone is made of a special chloroprene (neoprene) rubber.

Re-calibration/servicing

In certain countries the authorities demand that the valves are checked at least once a year (see local rules).

Control/Identication

After adjustment of the set pressure at Danfoss, the valves are sealed. For that reason Danfoss can only guarantee correct operation, as long as the seal remains unbroken.

All valves are provided with a metal plate with the following information:

• Flow diameter

• Set pressure

• Date of production

• Production number

• Type approved code

Transport/Handling

The valves are tted with special protection covers and packed into purpose made transportation cartons. It is important the cover remains tted around the valve until it is installed. To ensure the exact and precise operation of the valve it must be handled with care.

Pressure Equipment Directive (PED)

Table 1: Pressure Equipment Directive (PED)

Table 2: SFV

Working pressure

Reseating pressure

Set pressure p

Opening pressure

p + 10%

p – 10%

0 100% Opening degree

Size (mm)

Size (in.)

Inlet

Outlet

L (mm)

L (in.)

2025¾1G 1¼

G 1¼

G 1½ G 1½2020

0.79

ø

Size (mm)

Size (in)

Inlet (mm)

Inlet (in.)

Outlet (mm)

Outlet (in.)

øDTøDTøDTøD

T

20 25

3

⁄4

1

26.9

2.6

2.3251.059

1.327

0.091

0.102

33.7

42.4

2.6

1.337

1.669

0.102

Safety relief valve, Type SFV 20-25

Figure 1: SFV Graph

SFV is designed as a standard safety relief valve (DIN 3320), which are recommended for refrigeration plants. On a rise in pressure above the set pressure, the safety relief valve will initially start opening slightly, to minimise the outlet of refrigerant. If the pressure continues to increase, the valve will open fully. The safety relief valve will be fully open before the pressure is 10% higher than set pressure, and fully closed before the pressure is 10% below set pressure.

Connections

Available with the following connections:

• Outside pipe thread T (ISO 228/1)

• Welding ttings (DIN 2448)

Figure 2: T

Table 3: T outside pipe thread, (ISO 228/1)

Figure 3: DIN

Table 4: Welding ttings DIN (2448)

q

m

C

A0K

dr

K

b

V

pset

p

atm

p

Valve

Nominal size

Flow diameter

Flow area

De-rated, certied coecient of discharge

Inlet

Outlet

doA

0

K

dr

SFV 20

20 mm

25 mm

18 mm

254 mm

2

0.54

¾ in.

1 in.

0.709 in.

0.394 in

2

SFV 25

25 mm

32 mm

23 mm

415 mm

2

0.48

1 in.1¼0.906 in.

0.643 in

2

Discharge capacity (kg/h)

Discharge function depending of the actual refrigerant (κ) see table 2 (‑)

Flow area of the safety relief valve (mm2).

De-rated coecient of discharge (Kdr = Kd × 0.9), (the Kdr is certied by TÜV) see table 1 (‑)

Correction factor for sub‑critical ow. (-) Kb = 1.0 when the back pressure is lower than approx. 0.5 × relieving pressure (Pb < 0.5 × p) For all SFV safety valves Kb = 1.0

Specic volume of the vapour at the releiving pressure p. (m3/kg)

Set pressure, the predetermined pressure at which a pressure relief valve under operation starts to open (p

set

is indicated on the metal plate on the safety relief valve). (bar gauge)

Atmospheric pressure. (1 bar)

Relieving pressure, p = pset × 1.1 + Patm (bar absolute)

Refrigerant

Isentropic exponent κ

Discharge function C

R22

1.17

2.54

R134a

1.12

2.5

R404A

1.12

2.49

Safety relief valve, Type SFV 20-25

Installation

To ensure exact operation of the safety relief valve it should be installed with the spring housing upwards. If the valve is mounted as an internal safety relief valve without any demand for exact opening pressure, the valve may be tted with the spring housing in other positions. When the valve is mounted, it is important to avoid the inuence of static, dynamic and thermal stress.

A very precise technique has been applied for the production of the seal. However, this seal can still be damaged, if dirt is blown from the pipe system into the valve.

It is recommended that safety relief valves exhaust into the open air with a U‑pipe lled with oil on the discharge branch, to prevent dirt from penetrating into the valve. It is also recommended that the valves be installed in pairs in conjunction with the double stop valve type DSV. For further information please see the DSV data sheet.

Capacity

The design and construction of the safety relief valve has been tested and approved by TÜV. This test comprises control of the function of the valve as well as measuring of the capacity, which is the basis of the curves and tables on the following pages. The values in the table are based on saturated gas.

If e.g. back pressure or superheated gas have to be taken into consideration, the formulas or the Danfoss computation program (DIRcalc) can be used.

Table 5: Capacity Values

The discharge capacity of the safety relief valves are based on (IS0 4126‑1 / prEN 1313 6 (1998)).

qm= 0.2883 × C × A0× Kdr× K

p

b

v

For further details see the above-mentioned ISO or EN standards.

Table 6: Table 2. Properties of Refrigerants

Refrigerant

Isentropic exponent κ

Discharge function C

R410A

1.17

2.54

R717 (Ammonia)

1.31

2.64

R744 (CO2)

1.3

2.63

Air

1.4

2.7

Set pressure

R22

R134a

R404A

R717

Air (20 °C)

13 bar(g)

189 psig

kg/h

lb/min

3220

118

3430

126

3500

129

1415521790

66

18 bar(g)

261 psig

kg/h

lb/min

4440

163

4800

176

4900

180

1925712435

89

21 bar(g)

305 psig

kg/h

lb/min

5215

192

5680

209

5770

212

2235822820

104

25 bar(g)

363 psig

kg/h

lb/min

6285

231

6980

257

7125

262

2660983335

122

Set pressure

Capacity

R717

R404A

R134a

Air (20°C)

R22R22

(

Danfoss

80Z814

Set pressure

R22

R134a

R404A

R717

Air (20 °C)

13 bar(g)

189 psig

kg/h

lb/min

4670

172

4980

183

5075

186

2050752600

96

18 bar(g)

261 psig

kg/h

lb/min

6445

237

6965

256

7115

261

2790

103

3530

130

21 bar(g)

305 psig

kg/h

lb/min

7565

278

8240

303

8370

308

3240

119

4090

150

25 bar(g)

363 psig

kg/h

lb/min

9120

335

10135

372

10340

380

3860

142

4835

178

Safety relief valve, Type SFV 20-25

Table 7: Capacity : SFV 20

Figure 4: SFV 20

Table 8: Capacity : SFV 25

(

Set pressure

Capacity

Danfoss

80Z815

Safety relief valve, Type SFV 20-25

Figure 5: SFV 25

Material specication

Figure 6: Material specication

No.

Part

Material

DIN

ISO

ASTM

1

Housing

Steel

G20Mn5 QT

*P285QH

*TTSt35N

TW 6, 2604/3‑75

Grade 1, A333, A334

* A350 LF2

2

Valve seat

Stainless steel

X10CrNiS189, 17440

Type 17, 683/13

AISI 303

3

Packing washer

Aluminium

*Non-asbestos gasket

4

Valve top

Steel

St. 37.2, 1652

Fe 360 B, 660

Grade C, A 283

6

Valve spindle

Stainless steel

X10CrNiS189, 17440

Type 17, 683/13

AISI 303

10

Valve cone

Steel

11

Valve cone seal

Chloroprene (Neoprene)

15

Packing washer

Aluminium

*Non-asbestos gasket

17

Spring

Steel

Class C

A 679, 17223

23

Packing washer

Aluminium

*Non-asbestos gasket

24

Plug

Steel

9S Mn28, 1651

*R St 37.2, 17100

Type 2, R 683 Fe 360 B,

630

Grade C, A 283

25

Marking label

Aluminium

SFV 20 - 25 T

SFV 20 - 25 with welding ttings (anges)

G₀

øD

AF

G₁

A

B

Valve size

ABCøDAF

Weight

SFV 20 (

3

⁄4 in.)

mm152704060604.2 kg

in.

2.17

10.63

1.57

2.36

9.2 lb

SFV 25 (1 in.)

mm552704060604.2 kg

in.

2.17

10.63

1.57

2.36

9.2 lb

Safety relief valve, Type SFV 20-25

Table 9: Specications

*Alternative material

Dimension and weight

Table 10: Dimension and weight

Table 11: SFV 20 - 25 T, with threaded connections ISO 228/1 pipe threads

Valve size

A

B

G

0

øD

G

1

AF

Weight

SFV 20 (

3

⁄4 in.)

mm8530090609060

4.2 kg

in.

3.35

11.81

3.54

2.36

3.54

2.36

9.2 lb

SFV 25 (1 in.)

mm8530090609060

6.0 kg

in.

3.35

11.81

3.54

2.36

3.54

2.36

13.2 lb

Safety relief valve, Type SFV 20-25

Table 12: SFV with welding ttings, DIN 2448

Specied weights are approximate values only.

Valve type

SFV

Safety relief valve

Available connections

T

DIN welding tting

Nominal size in mm (valve size measured on the connection diameter)

20

DN 20××

25

DN 25××

Connections

T

Outside threaded connections: ISO 228/1 Pipe thread

- The welding ttings for single mounted safety relief valve must be ordered separately

Pressure setting

Standard pressure setting: 2××

SFV 20

SFV 25

210

10 bar (145 psig)

××211

11 bar (160 psig)

××212

12 bar (174 psig)

××213

13 bar (188 psig)

××214

14 bar (203 psig)

××215

15 bar (218 psig)

××216

16 bar (232 psig)

××217

17 bar (247 psig)

××218

18 bar (261 psig)

××219

19 bar (276 psig)

××220

20 bar (290 psig)

××221

21 bar (305 psig)

××222

22 bar (319 psig)

××223

23 bar (334 psig)

××224

24 bar (348 psig)

××225

25 bar (363 psig)

××Standard pressure setting with TÜV certicate: 3××

SFV 20

SFV 25

310

10 bar (145 psig)

××311

11 bar (160 psig)

××312

12 bar (174 psig)

××313

13 bar (188 psig)

××314

14 bar (203 psig)

××315

15 bar (218 psig)

××316

16 bar (232 psig)

××317

17 bar (247 psig)

××318

18 bar (261 psig)

××319

19 bar (276 psig)

××320

20 bar (290 psig)

××321

21 bar (304 psig)

××322

22 bar (319 psig)

××323

23 bar (334 psig)

××324

24 bar (348 psig)

××325

25 bar (362 psig)

×

Safety relief valve, Type SFV 20-25

Ordering

How to order

The table below is used to identify 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.

Example for type codes

Table 13: SFV 20 T 210

 WARNING:

Where products need to be certied according to specic certication societies, the relevant information should be included at the time of order.

Size

Construction and test facilities are approved by TUV

mm

in.

Type

Bar (psig)

Part no.

20

3

⁄4

SFV20 T 210

10 (145)

2416+254

20

3

⁄4

SFV20 T 211

11 (160)

2416+255

20

3

⁄4

SFV20 T 212

12 (174)

2416+256

20

3

⁄4

SFV20 T 213

13 (189)

2416+150

20

3

⁄4

SFV20 T 214

14 (203)

2416+257

20

3

⁄4

SFV20 T 215

15 (218)

2416+258

20

3

⁄4

SFV20 T 216

16 (232)

2416+259

20

3

⁄4

SFV20 T 217

17 (247)

2416+260

20

3

⁄4

SFV20 T 218

18 (261)

2416+151

20

3

⁄4

SFV20 T 219

19 (276)

2416+261

20

3

⁄4

SFV20 T 220

20 (290)

2416+262

20

3

⁄4

SFV20 T 221

21 (305)

2416+152

20

3

⁄4

SFV20 T 222

22 (319)

2416+241

20

3

⁄4

SFV20 T 223

23 (334)

2416+263

20

3

⁄4

SFV20 T 224

24 (348)

2416+264

20

3

⁄4

SFV20 T 225

25 (363)

2416+183

Size

Construction and test facilities are approved by TUV

mm

in.

Type

Bar (psig)

Part no.

25

1

SFV25 T 210

10 (145)

2416+265251

SFV25 T 211

11 (160)

2416+266251

SFV25 T 212

12 (174)

2416+267251

SFV25 T 213

13 (189)

2416+153251

SFV25 T 214

14 (203)

2416+268251

SFV25 T 215

15 (218)

2416+269251

SFV25 T 216

16 (232)

2416+270251

SFV25 T 217

17 (247)

2416+271251

SFV25 T 218

18 (261)

2416+154251

SFV25 T 219

19 (276)

2416+272251

SFV25 T 220

20 (290)

2416+273251

SFV25 T 221

21 (305)

2416+155251

SFV25 T 222

22 (319)

2416+242251

SFV25 T 223

23 (334)

2416+274251

SFV25 T 224

24 (348)

2416+275251

SFV25 T 225

25 (363)

2416+184

Size

Each valve is certied by a representative from TUV

mm

in.

Type

Bar (psig)

Part no.

20

3

⁄4

SFV20 T 310

10 (145)

2416+285

20

3

⁄4

SFV20 T 311

11 (160)

2416+286

20

3

⁄4

SFV20 T 312

12 (174)

2416+287

20

3

⁄4

SFV20 T 313

13 (189)

2416+160

20

3

⁄4

SFV20 T 314

14 (203)

2416+288

20

3

⁄4

SFV20 T 315

15 (218)

2416+289

20

3

⁄4

SFV20 T 316

16 (232)

2416+290

20

3

⁄4

SFV20 T 317

17 (247)

2416+291

20

3

⁄4

SFV20 T 318

18 (261)

2416+161

20

3

⁄4

SFV20 T 319

19 (276)

2416+292

20

3

⁄4

SFV20 T 320

20 (290)

2416+293

20

3

⁄4

SFV20 T 321

21 (305)

2416+162

20

3

⁄4

SFV20 T 322

22 (319)

2416+294

20

3

⁄4

SFV20 T 323

23 (334)

2416+295

20

3

⁄4

SFV20 T 324

24 (348)

2416+296

20

3

⁄4

SFV20 T 325

25 (363)

2416+186

Safety relief valve, Type SFV 20-25

Table 14: Certied SFV valves with standard set pressure

Table 15: Certied SFV valves with standard set pressure

Table 16: Certied SFV valves with standard set pressure and TUV pressure setting certicate with each valve

Size

Each valve is certied by a representative from TUV

mm

in.

Type

Bar (psig)

Part no.

25

1

SFV25 T 310

10 (145)

2416+297251

SFV25 T 311

11 (160)

2416+298251

SFV25 T 312

12 (174)

2416+299251

SFV25 T 313

13 (189)

2416+163251

SFV25 T 314

14 (203)

2416+300251

SFV25 T 315

15 (218)

2416+301251

SFV25 T 316

16 (232)

2416+302251

SFV25 T 317

17 (247)

2416+303251

SFV25 T 318

18 (261)

2416+164251

SFV25 T 319

19 (276)

2416+304251

SFV25 T 320

20 (290)

2416+305251

SFV25 T 321

21 (305)

2416+165251

SFV25 T 322

22 (319)

2416+306251

SFV25 T 323

23 (334)

2416+307251

SFV25 T 324

24 (348)

2416+308251

SFV25 T 325

25 (363)

2416+187

Type

Code No.

Flanges + gaskets set for SFV 20

148F3020

Flanges + gaskets set for SFV 25

148F3021

Type

Code No.

Repair kit for SFV 20 (gaskets and cone)

2453+082

Repair kit for SFV 25 (gaskets and cone)

2453+083

Safety relief valve, Type SFV 20-25

Table 17: Certied SFV valves with standard set pressure and TUV pressure setting certicate with each valve

Table 18: Flanges and gaskets

Table 19: Repair kit

File name

Document type

Document topic

Approval authority

BV 39409-B0 BV

Marine - Safety Certicate

BV

Kolding - Denmark; Tianjin - China

TUV 07 202 1321 Z 0018-13-D-01

Pressure - Safety Certicate

PED

TÜV

TUV SV 17-895

Pressure - Safety Certicate

TÜV

DNV GL TAP000000M

Marine - Safety Certicate

DNV GL

RMRS 19.10327.266

Marine - Safety Certicate

RMRS

Safety relief valve, Type SFV 20-25

Certicates, declarations and approvals

The list contains all certicates, 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.

Valid approvals

Table 20: Valid approvals

Online support

Danfoss oers a wide range of support along with our products, including digital product information, software, mobile apps, and expert guidance. See the possibilities below.

The Danfoss Product Store

The Danfoss Product Store is your one-stop shop for everything product related—no matter where you are in the world or what area of the cooling industry you work in. Get quick access to essential information like product specs, code numbers, technical documentation, certications, accessories, and more. Start browsing at store.danfoss.com.

Find technical documentation

Find the technical documentation you need to get your project up and running. Get direct access to our ocial collection of data sheets, certicates and declarations, manuals and guides, 3D models and drawings, case stories, brochures, and much more.

Start searching now at www.danfoss.com/en/service-and-support/documentation.

Danfoss Learning

Danfoss Learning is a free online learning platform. It features courses and materials specically designed to help engineers, installers, service technicians, and wholesalers better understand the products, applications, industry topics, and trends that will help you do your job better.

Create your Danfoss Learning account for free at www.danfoss.com/en/service-and-support/learning.

Get local information and support

Local Danfoss websites are the main sources for help and information about our company and products. Find product availability, get the latest regional news, or connect with a nearby expert—all in your own language.

Find your local Danfoss website here: www.danfoss.com/en/choose-region.

Spare Parts

Get access to the Danfoss spare parts and service kit catalog right from your smartphone. The app contains a wide range of components for air conditioning and refrigeration applications, such as valves, strainers, pressure switches, and sensors.

Download the Spare Parts app for free at www.danfoss.com/en/service-and-support/downloads.

Coolselector®2 - nd the best components for you HVAC/R system

Coolselector®2 makes it easy for engineers, consultants, and designers to nd and order the best components for refrigeration and air conditioning systems. Run calculations based on your operating conditions and then choose the best setup for your system design.

Download Coolselector®2 for free at coolselector.danfoss.com.

Danfoss can accept no responsibility for possible errors in catalogues, brochures and other printed material. Danfoss reserves the right to alter its products without notice. This also applies to products already on order provided that such alterations can be made without subsequential changes being necessary in specications already agreed. All trademarks in this material are property of the respective companies. Danfoss and the Danfoss logotype are trademarks of Danfoss A/S. All rights reserved.

Danfoss SFV 20, SFV 25 Data sheet

Specifications and Main Features

Frequently Asked Questions

User Manual