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Danfoss A/S (RC-CMS / HBS), 12 - 2003 RD7FE102 3

Technical leaet Safety relief valves and double stop valves, type SFVL and DSVL

The SFVLsafety valves are backpressuredependent pressure relief valves. These aredesigned for protection of vessels and othercomponents against excessive pressure. Thesevalves are recommended as an external andinternal safety relief valve in refrigeration plants.

These valves are manufactured according tostrict quality demands and safety requirementsfor refrigeration installations, as speciedin many markets and comply with ASHRAEAddendum15C-2000. These valves aremanufactured in accordance with the ASMEQuality Control Procedures and stamped withthe UV symbol. They are certied by the United

States National Board of Boiler & Pressure VesselInspectors and are stamped with the NB symbol.

DSVLseries 3-way valves are designed tomeet all industrial refrigeration applicationrequirements.

DSVL valves are designed specically for use withdouble safety valve systems. When used in suchapplications, only one safety valve can be shut oor isolated at any one time. Complete shut o ofone safety valve or the other can be obtained byfront seating or back seating of the valve spindle.

The valves are designed to give favourable owcharacteristics and are easy to dismantle forservicing. The valve cone is designed to ensuretight seal.

Introduction

Features

SFVL

The 800 series safety relief valve:Teon seats mated with the stainless steelmultiple crown rings which provide a reliablesealing. The triple crown sealing rings arelocated at slightly dierent heights in orderto provide compound sealing ability with themating teon ring.

Special extra lift, pop-open feature in order toprovide a high relief capacity.

A four-wing guided, stainless steel upper seatprovides an excellent guidance for the highlift and reseating action.

A spring and seat design which provides fora concentric and axial spring force, loads theupper seat uniformly and maintains a tightseal.

All relief valves come with an installation tagand cable wire. Each valves identicationtag has information regarding the cataloguenumber, month and year of manufacture, setpressure, inlet pipe size and capacity for AIR inunits of SCFM. The tag is fastened with driverivets for security.

Relief valves are subject to 100% factorytesting through three separate test sequencesto verify quality and set pressure before beingfactory sealed for security.

DSVL The 843, 844, and 845 series stop valves feature:A compact casted ductile iron valve bodywhich is painted with corrosion inhibitingprimer paint

Full port pipe threaded connections for easyinstallation and disassembly. The connectionsare marked for easy identication.

Stainless steel stems and seal caps

Teon packing gland

Teon valve seat


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4 RD7FE102 Danfoss A/S (RC-CMS / HBS), 12 - 2003


The SFVL series relief valves are availablewith pressure settings from 75 to 400 psiand a maximum working pressure of 500psi. Common set pressures of 150, 250 and300 psi are available from stock or with short

lead-time. Other special pressure settings maybe ordered (see capacity charts in technicalinformation section.)

The SFVL series relief valves are suitable forrefrigerants R717 (ammonia NH

3), HFC and

HCFC refrigerants.

The temperature range is 20F to +275F(29C to 135C).

The valve body is made from ductile iron thatmeets the ASME SA-395 specication grade60-40-18.

All upper and lower valve seats, springs, andspring guides are constructed from 304-grade

stainless steel.Valve bodies are painted with a corrosioninhibiting primer paint

The SFVL series relief valves are designed foruse with 800 series DSVL (843, 844, or 845).

Technical data

SFVL

DSVL The series relief valves are suitable forrefrigerants R717 (ammonia NH

3), HFC and

HCFC refrigerants.

The 843, 844, and 845 DSVL valves areapproved: Maximum working pressure of 400 psig. Temperature range: 20F to +300 F (29C to +149C)

To receive an updated list of certicationon the products please contact your localDanfoss Sales Company.

Connections:The valves are oered with threaded (NPT)connections.

Housing and internal materials:The valve body is made from cast ductile ironthat meets the ASME SA-395 specicationgrade 60-40-18.

All upper and lower valve seats, springs, and

spring guides are constructed from 304-gradestainless steel.

The upper valve seat is teon.

Design


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Material specication

SFVL DSVL

No. Part Material

1 Lower seat Stainless steel

2 Upper seat Stainless steel

3 Teon ring Teon

4 Uniform load spring guide Sta inless steel

5 Spring Stainless steel

6 Housing Ductile iron

No. Part Material

1 Stem / spindle Stainless steel

2 Packing nut Stainless steel

3 Bonnet Steel

4 Housing Ductile iron

5 Upper and lower seat Steel

SFVL DSVL


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Capacities


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Dimensions and weights

SFVL DSVL

Valve size A B C D E Weight

SFVL 803/813in. 1.77 5.24 1.77 1.65 2.83 3.2 lb

mm 45 133 45 42 72 1.4 kg

SFVL 804/814in. 1.97 6.06 1.97 1.97 3.31 5.3 lb

mm 50 154 50 50 84 2.4 kg

SFVL 805/815in. 2.36 7.09 2.36 2.36 3.94 7.9 lb

mm 60 180 60 60 100 3.5 kg

Valve size A B C E Weight

DSVL 843in. 1.38 7.40 1.77 3.54 3.75 lb

mm 35 188 45 90 1.7 kg

DSVL 844in. 1.73 9.37 2.01 4.13 6.5 lb

mm 44 238 51 105 2.9 kg

DSVL 845in. 1.97 11.34 2.20 4.72 10.25 lb

mm 50 288 56 120 4.6 kg

E


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Ordering How to orderThe table below is used to identify the valverequired.Please note that the type codes only serve toidentify the valves, some of which may not form

part of the standard product range. For furtherinformation please contact your local DanfossSales Company.

Type ConnectionsPressure setting

[psig]Code no.

SFVL 803

NFPT x NFPT 150 148F8000



SFVL 813

NFPT x 1 NFPT 150 148F8003

NFPT x 1 NFPT 250 148F8004

NFPT x 1 NFPT 300 148F8005

SFVL 804

NFPT x 1 NFPT 150 148F8006

NFPT x 1 NFPT 250 148F8007

NFPT x 1 NFPT 300 148F8008

SFVL 814

NFPT x 1- NFPT 150 148F8009

NFPT x 1- NFPT 250 148F8010

NFPT x 1- NFPT 300 148F8011

SFVL 805

1 NFPT x 1- NFPT 150 148F8012

1 NFPT x 1- NFPT 250 148F8013

1 NFPT x 1- NFPT 300 148F8014

SFVL 815

1 NFPT x 1- NFPT 150 148F8015

1 NFPT x 1- NFPT 250 148F8016

1 NFPT x 1- NFPT 300 148F8017

Safety valves, type: SFVL

Type Connections Code no.

DSVL 843 x x NFPT 148F8018

DSVL 844 x x NFPT 148F8019

DSVL 845 1 x 1 x 1 NFPT 148F8020

Double stop valves, type: DSVL

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