Split disc check valvesfor pressures up to 50 bar g

73 mm

A typical SDCV. Weight 6.8 kg.

Split disc check valvesfor the prevention of reverse flowThe Spirax Sarco wafer pattern range of split disc check valves type SDCV provides an effective maintenancefree solution for the prevention of reverse flow in pipelines carrying most types of liquids, gases includingsteam and condensate.

Designed to fit between two pipeline flanges, they provide a compact installation when compared size-for-sizewith conventional swing and lift type check valves.

The Spirax Sarco range of SDCV split disc wafer check valve bodies are available in carbon steel and austeniticstainless steel, and with seating options of metal or soft fluoroelastomer to match most applications.

Seat options in stainless steeland Viton for oils, gases, steamand water applications. Discto seat shut-off conforms toAPI 598 for all SDCV's.

Designed and manufactured inaccordance with API 594.

Self-centering forfool proof installation.

Flange standards:EN 1092 PN16 and PN40,ANSI 150 and ANSI 300,JIS /KS 10K and 20K.

Larger sizes have anintegral lifting eye.

Fully complies with therequirements of theEuropean PressureEquipment Directive97 / 23 / EC.

User benefits● Can be used with a wide variety of liquids, gases

and vapours.

● Compact design for simple installation betweena wide range of flange types and in any planeexcept vertically downwards.

● Each model designed to fit between a varietyof flange standards - simplifying and reducingspares stock holdings.

● Wide variety of body materials and seating allowsproduct matching to any specific application.

● Computer aided product design and modernproduction methods ensure product of thehighest quality.

● Materials of construction ensure low wear rateswith minimal maintenance.

● Short face-to-face design of an SDCV inherentlymakes it lighter and more compact leading toeasier installation, maintenance, and lower cost.

● Fully complies with the European PressureEquipment Directive 97/23/EC.

DN80 comparison

A typical conventional swing check valve.Weight 27 kg.

318 mm

● Review application.

● Confirm the flow direction.

● Confirm line size and flange standard.

● Confirm preferred materials of construction.

● Determine if metal-to-metal or soft seatrequired.(Remember soft seat versions have alower temperature limit).

● Confirm certification /inspectionrequirements.

How they workSpirax Sarco SDCV wafer check valves are opened bythe flow of pressure of the fluid and closed by the springwhen flow ceases and before reverse flow can occur.

Range and optionsMaterial Carbon steel Austentic stainless steelBody rating ANSI 300 PN40 ANSI 300 PN40

Model SDCV3 SDCV7 SDCV4 SDCV8DN50 • • • •DN80 • • • •DN100 • • • •

Sizes DN150 • • • •DN200 • • • •DN250 • • • •DN300 • • • •ANSI 150 • •ANSI 300 • •

Pipeline JIS / KS 10K • •connections JIS / KS 20K • •

PN16 • •PN40 • •

Seat Metal-to-metal Standard Standard Standard Standardoptions Soft seat (fluoroelastomer) • • • •Spring Standard spring Standard Standard Standard Standardoptions Heavy spring • • • •

PMA 51 bar g @ 38°C 40 bar g @ 100°C 49 bar g @ 38°C 40 bar g @ 50°CTMA 400°C 400°C 538°C 500°C

Pressure / PMO 51 bar g @ 38°C 40 bar g @ 100°C 49 bar g @ 38°C 40 bar g @ 50°Ctemperature

TMOMetal seat 400°C @ 34 bar g 400°C @ 22 bar g 538°C @ 24 bar g 500°C @ 21 bar g

limits Soft seat 200°C @ 44 bar g 200°C @ 38 bar g 200°C @ 36 bar g 200°C @ 28 bar g

Minimum operating-10°C -10°C -29°C -29°Ctemperature

Check valve selectionGenerally the selection of a split disc check valveis easy. However there are a number of pointswhich need to be considered. Correct selectionis assured by following the checklist below:

InstallationThe SDCV uses the body for location so that its outsidediameter touches all flange bolts which automaticallyself-centres the valve in the pipeline.

Split disc check valves can be installed with the liquid/gasflowing horizontally into the valve (A) or, with the liquid /gas flowing vertically upwards through the valve (B).

Split disc check valves are not recommended forinstallation with the liquid/gas flowing verticallydownwards through the valve or applications whereheavily pulsating flow exists, such as close to areciprocating compressor.

Open Closed

A B

4

The SDCV can be usedin a wide variety of applications including:

Process lines. Heating systems. Sprinkler installations.Oil lines. Hot and cold water systems. Steam and condensate lines.

And in industries as diverse as:Chemicals. Pharmaceuticals. Shipbuilding.Power generation. Food production. Pulp and paper.Textiles.

In fact, any industry where fluid flows in pipes.

SB-P601-17 ST Issue 3

Spirax-Sarco Limited, Charlton House,Cheltenham, Gloucestershire, GL53 8ER UK.

Tel: +44 (0)1242 521361 Fax: +44 (0)1242 573342E-mail: Enquiries@SpiraxSarco.com

Internet: www.SpiraxSarco.com© Copyright 2005 Spirax Sarco is a registered trademark of Spirax-Sarco Limited

Pipeline fitting protectionPrevents problems with pipeline fittingssuch as flowmeters, control valves andstrainers which are susceptible todamage by reverse flow.

Flowmeter SDCV

Strainer SDCV

Prevention of reverse flowInstalled after each pump outlet inwater distribution systems to:• Prevent reverse flow should one

pump fail.• Allow automatic changeover without

manual isolation.

SDCV

SDCV

Typical applications