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DCVWafer check valves

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DCV wafer check valvesto prevent reverse flow . . .

The DCV can be used in a wide variety of

applications including:

Hot and cold water system Process lines

Sprinkler installations Heating systems

Steam and condensate lines Oil lines

And in industries as diverse as:

Chemicals Food production

Pharmaceuticals Pulp and paper

Ship building Textiles

Power generation

. . .of

The Spirax Sarco range of DCV wafer check valves provides an effective minimal maintenance free solution

for the prevention of reverse flow in pipelines carrying most types of liquids, steam and gases.

Designed to fit between two pipeline flanges, they provide a compact installation when compared

size for size with conventional swing and lift type check valves.

The Spirax Sarco range of DCV wafer check valves is available in a wide range of body materials from bronze

to austenitic stainless steel and with seating options of stainless steel, viton or EPDM to match most applications.

Spring options:High temperature springs available.

Heavy duty springs for boiler or gravity feedline applications.

No spring option for very low opening differential pressures.(Vertical upward flow only).

Seat options in stainless steel,viton for oils and gasesand EPDM for water.

Flange standards:BS 10 tables E and H;DIN PN6, PN10,PN16, PN25 and PN40;JIS5, JIS10, JIS16 and JIS20;ANSI 150 and ANSI 300.

Designed and manufacturedin accordance withBS 7438: 1991

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User benefitsq Can be used with a wide variety of liquids,

gases and vapours.

q Compact design for simple installation between

a wide range of flange types and in any plane.

q Each DCV is designed to fit between a variety

of flange standards - simplifying and reducing

spares stock holdings.

q Wide variety of body materials, seating and

springs allows product matching to the

specific application.

q Computer aided product design and up to

the minute production methods ensures the

product is of the highest quality.

q Materials of construction ensure low wear rates

with minimal maintenance.

q Flow path design ensures low pressure drop.

DN80 comparisonTypical DN80 conventional swing check valveWeight 27 kg

71 mm

318 mm

uid passing through pipelines, in any industry.

Compact design:

DCV1 PN16 bronze body for general purpose water and HVAC use.

DCV2 PN40 ferritic stainless steel body for general purpose steam and fluids at high pressures.

DCV3 PN40 austenitic stainless steel body for aggressive fluids, vapours, acids and alkalines.

Full gasket area design:

DCV4Austenitic stainless steel body with full gasket contact area, for ANSI 150 and 300 flanges,for general purpose steam and fluids at high pressures, and for aggressive fluids, vapours, acids and alkalines.

DCV7 A lower grade of austenitic stainless steel body for general purpose on steam and fluids at high pressures.

DCV8 Austenitic stainless steel body for aggressive fluids, vapours, acids and alkalines at high pressures and temperature.

DCV9 Austenitic stainless steel body for high flowrate applications, hot water systems, steam and condensate systems etc.

Seating options and standardsIn stainless steel, viton for oils and gases, EPDM for water. Standard of shut-off conforms to:

DCV1/2/3/4 DIN 3230 Part 3, BN2 as standard and BO3 as an option.

DCV7/8DIN 3230 part 3, BO3 as standard.Soft seated versions meet DIN 3203 part 3 BN1 and BO1 provided a differential pressure exists.

DCV9DIN 3230 part 3, BN2 as standard.Soft seated versions meet DIN 3230 part 3 BN1 and BO1 provided a differential pressure exists.

Disc seating and spring optionsStainless With With Stainless Heavy High No

steel disc Viton EPDM steel duty temperature spring

insert insert spring spring spring

DCV1 Standard q q Standard q q


DCV3 Standard q q Standard q q q

DCV4 Standardq q

Standardq q




A typical DN80Spirax Sarco DCVWeight 3.6 kg

Product options

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Typical applications

DCV

DCV

Prevention of reverse flowInstalled after multi-plex pump outlets in water

distribution systems to prevent reverse flow

during auto changeover sequencing and

stand-by use.

Vacuum breakerInstalled in 'reverse' mode, the DCV

will act as a vacuum breaker. This will

prevent any back syphoning of liquids

damaging upstream equipment when

the steam supply is turned off and

the equipment cools.

Pipeline fitting protectionPrevents damage to pipeline fittings such as

flowmeters, control valves and strainers which

are susceptible to damage by reverse flow.

Steam boiler

flooding protectionWhen boilers are shut-down and steam

pressure lost, the head of water above the

pump can cause flow through the pump

flooding the boiler. The DCV2B fitted with a

heavy duty spring and installed after the

feedpump will prevent any gravity flow.

Feedtank

DCV2B

Boiler

DCV

DCV

DCV

Flowmeter

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Pressure loss diagrams

50

30

20

10

5

3

2

1

0.5

0.2

10.50.20.10.050.01 0.02

1

2

3

5

10

20

30

50

100

200

DN100

DN80

DN50

DN40

DN25

DN20

DN15

0.3

Pressure loss in bar

WaterflowrateinVwm/h

WaterflowrateinVwl/s

DCV4 (DN5-100), DCV9 (DN50 and 80 only)

100

0.5

1

2

3

5

10

20

30

50

0.2

0.3

0.5

30

20

10

5

3

2

1

0.01 0.02 0.05 0.1 0.2 0.5 1

DN15

DN20

DN25

DN32

DN40

DN65

DN50

DN80

DN100

Pressure loss in bar

WaterflowrateinVwm/h

WaterflowrateinVwl/s

DCV1, 2, 3, 7 and 8

Differential pressures with zero flow for:standard and high temperature springs

Flow direction

Size DN15 DN20 DN25 DN40 DN50 DN80 DN100

25.0 25.0 25.0 28.0 29.0 31.0 33.0

22.5 22.5 22.5 24.5 24.5 25.5 26.5

20.0 20.0 20.0 20.0 20.0 20.0 20.0Where lowest opening pressures are required, valves without

springs can be installed in vertical pipes with bottom-to-top flow.Without spring

2.5 2.5 2.5 4.0 4.5 5.5 6.5

Vw =Q

x V1 000

How DCV's work

Open

Closed

Spirax Sarco DCV wafer check valves are opened by

the flow pressure of the fluid and closed by the spring

when flow ceases and before reverse flow can occur.

InstallationThe design of the Spirax Sarco DCV wafer check valve

allows installation between flanges in any plane andwith flow in any direction. The only exception is when

the DCV is installed without a spring. The unit must

then be installed in a vertical pipe with upward flow.

The unique cam design of the DCV1, 2 and 3 allows

the various flange types to be accommodated by simply

rotating the body to touch all flange bolts which

automatically self centres the valve in the pipeline. The

DCV4, 7, 8 and 9 use the body or cut outs in the body

for location between the various ANSI standard flanges.

These valves are not recommended for applicationswhere heavily pulsating flow exists, such as close to a

reciprocating compressor.

Vw= Equivalent water volume flow in l/ s or m/h

Q = Density of fluid kg/ m

V = Volume of fluid l/s or m/ h

Pressure loss information for steam, compressed

air and gases are available from Spirax Sarco.

Opening pressures in mbarDisc and spring combinationsDisc Spring Valve body markings

High temperature spring N

Standard metal discWithout spring W

Heavy duty spring H

Standard spring V

Viton soft faced discWithout spring WV

Heavy duty spring HV

Without spring WE

EPDM soft faced disc Heavy duty spring HE

Standard spring E

Valves tested to DIN 3230 part 3, B03 T

No identification indicates a standard spring with a metal disc.

Pressure loss diagram with open valve at 20C. The

values indicated are applicable to spring loaded

valves with horizontal flow. With vertical flow,

insignificant deviations occur only within the range of

partial opening. The curves given in the chart are valid

for water at 20C. To determine the pressure drop for

other fluids the equivalent water volume flowrate must

be calculated and used in the graph.

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Sizes and pipe connectionsDN15, 20, 25, 32, 40, 50, 65, 80,100. DCV1, 2 & 3 can be fitted between

BS 10 tables 'E' & 'H'; BS 4504 / DIN PN6, 10, 16, 25, 40; JIS5, 10, 16, 20with the following exception: DN40, 50, 80 & 100 - will not fit between

JIS5 flanges. DN65 & 80 - will not fit between BS 10 table 'E'

Spring optionsHeavy duty spring for sizes up to DN65. High temperature springs for

temperatures up to 400C for all sizes of DCV3 models onlySoft seated disc options

Viton (for oils and gases) - temperature limits: -15C to +250CEPDM (for water) - temperature limits: -50C to +150C

MaterialsDCV1 Bronze DIN W-Nr. 2.1050

Body DCV2 Ferritic stainless steel DIN W-Nr. 1.4313

DCV3 Austenitic stainless steel DIN W-Nr. 1.4581

Disc Austenitic stainless steel BS 1449 316 S11

Spring retainer Austenitic stainless steel BS 1449 316 S11

Standard spr ing Austeni tic sta inless steel BS 2056 316 S42

Heavy duty spring Austenitic stainless steel BS 2056 316 S42

High temperature spring Nickel alloy Nimonic 90

Limiting conditionsDCV1 DCV2 DCV3

Maximum body design conditions PN16 PN40 PN40

PMO - Maximum operating pressure bar g 16 40 40

TMO - With standard spring C 260 300 300

Maximum With heavy duty spring C - 300 300operating With high temperature spring C - - 400temperature Without spring C - 300 400

Minimum operating temperature C -200 -60 -196

Temperature limits with viton seat C -15 to +250

Temperature limits with EPDM seat C -50 to +150Cold hydraulic test pressure bar g 24 - -

Operating range

Sizes and pipe connectionsDN15, 20, 25, 40, 50, 80 and 100

can be fitted between ANSI 150 or 300 flanges

Spring options

High temperature spring for temperatures up to 400C

Soft seated disc optionsViton (for oils and gases) - temperature limits: -15C to +250C

EPDM (for water) - temperature limits: -50C to +150C

MaterialsBody Austenitic stainless steel ASTM A351 CF3M



Standard spr ing Austenitic stainless steel BS 2056 316 S42

Heavy duty spr ing Austei tic s ta in less steel BS 2056 316 S42


Limiting conditionsDCV4

Maximum body design conditions ANSI 300

PMO - Maximum operating pressure bar g 50

TMO - With standard spring C 300

Maximum With heavy duty spring C -operating With high temperature spring C 400temperature Without spring C 400

Minimum operating temperature C -196


Temperature limits with EPDM seat C -15 to +250Cold hydraulic test pressure bar g 76

DCV1, 2, and 3 DCV4

400

300

200

100

0

0 10 20 30 40 50

400

300

200

100

0

0 10 20 30 40

260200150

100

50

00 4 8 12 16

TemperatureC

Pressure bar g

Tem

peratureC

Pressure bar g

DCV2andDCV3

DCV1

The product must not be used in the red region.A - B - C - D DCV without spring or with high temperature spring.E - C - D DCV2 and DCV3 with standard and heavy duty spring.

D

A

E

BC

Operating range

TemperatureC

Pressure bar g

The product must not be used in the red region.A - B - D High temperature spring and without spring.

E - C - D Standard spring and heavy duty spring.

D

A

E

BC

DCV4

Steamsaturation curve


Steam

saturation curve

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Sizes and pipe connectionsDN15, 20, 25, 32, 40, 50, 65, 80,100. DCV7 & 8 can be fitted between

BS 4504 / DIN 2501 PN10, 16, 25 and 40 flanges

Spring optionsHeavy duty springs for sizes up to DN65 for boiler feed applications.

High temperature spring for all sizes of DCV8 models only,maximum 400C.

Soft seated disc optionsViton (for oils and gases) - temperature limits: -15C to +250C


MaterialsDCV7 Austenitic stainless steel (304) WS 1.4308

BodyDCV8 Austenitic stainless steel (316) WS 1.4581



Standard spr ing Austeni tic stainless steel BS 1449 316 S42

Heavy duty spring Austenitic stainless steel BS 1449 316 S42


Limiting conditionsDCV7 DCV8

Maximum body design conditions PN40



Maximum With heavy duty spring C 300

operating With high temperature spring C - 400temperature Without spring C 300 400

Minimum operating temperature C -200 -196



Operating range

Sizes and pipe connectionsDN50 and 80 can be fitted between

ANSI Class 150 or 300 flanges

Spring optionsHigh temperature spring for temperatures up to 400C

Soft seated optionsViton (for oils and gases) - temperature limits: -15C to +250C


MaterialsBody Austenitic stainless steel ASTM A351 CF3M



Standard spr ing Austenitic stainless steel BS 2056 316 S42


Limiting conditionsDCV9

Maximum body design conditions ANSI 300



Maximum With heavy duty spring C -operating With high temperature spring Ctemperature Without spring C 400

Minimum operating temperature C -196



Operating range

DCV7 and DCV8 DCV9

400

300

200

100

0

0 10 20 30 40 50

0 10 20 30 40

0

100

200

300

400

0 10 20 30 40

0

100

200

300

TemperatureC

Tem

peratureC DCV8

DCV7

The product must not be used in the red region.A - B - D DCV8 without spring or with high temperature spring.

E - C - D DCV7 and DCV8 with standard and heavy duty spring.

D

A

EB

CTemperatureC

Pressure bar g

The product must not be used in the red region.A - B - D High temperature spring and without spring.

E - C - D Standard spring.

D

A

EB

C

Pressure bar g

Pressure bar g

DCV9



Steam

saturation curve

E C

D

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Some of the products may not be available in certain markets.

SB S35 01

DCV

Dimensions and weights(approximate) in mm and kg

DCV1, 2 and 3

DCV4

Note: For DCV4 A = Centering dimension for ANSI 150B = Centering dimension for ANSI 300

DCV9

A

BE

F

D

C

BAE

FC

D

DCV7 and 8

Weight

Size A B C D E F DCV2 Kv

DCV1 DCV3

DN15 60.0 43 38 16.0 29.0 15 0.13 0.11 4.4

DN20 69.5 53 45 19.0 35.7 20 0.19 0.17 6.8

DN25 80.5 63 55 22.0 44.0 25 0.32 0.28 10.0

DN32 90.5 75 68 28.0 54.5 32 0.55 0.47 17.0

DN40 101.0 85 79 31.5 65.5 40 0.74 0.64 26.0

DN50 115.0 95 93 40.0 77.0 50 1.25 1.11 43.0

DN65 142.0 115 113 46.0 97.5 65 1.87 1.64 60.0

DN80 154.0 133 128 50.0 111.5 80 2.42 2.21 80.0

DN100 184.0 154 148 60.0 130.0 100 3.81 3.31 113.0

Size A B C D E F Weight Kv

DN15 54.0 47 38 25.0 22.35 15 0.24 4.4

DN20 67.0 57 46 31.0 27.35 20 0.41 7.5

DN25 73.0 67 54 35.0 33.15 25 0.54 12.0

DN40 95.0 86 76 45.0 49.15 40 1.15 26.0

DN50 111.0 105 95 56.0 59.15 50 1.84 39.0

DN80 149.0 136 130 71.0 90.15 80 3.69 84.0

DN100 181.0 174 160 80.0 111.15 100 5.70 150.0


DN15 52.5 - 51 16.0 29.0 15 0.25 4.4

DN20 62.5 - 61 19.5 36.0 20 0.40 6.8

DN25 72.0 - 70 22.5 44.0 25 0.55 10.0

DN32 83.5 - 82 28.0 54.5 32 0.85 17.0DN40 93.5 - 92 32.0 65.5 40 1.10 26.0

DN50 108.0 - 107 40.0 76.5 50 1.80 43.0

DN65 128.0 - 127 46.0 98.0 65 2.60 60.0

DN80 143.0 - 142 50.0 111.0 80 3.30 80.0

DN100PN16 164.0 - 164 60.0 130.0 100 5.50 113.0

PN40 169.0 - 167 60.0 130.0 100 5.50 113.0


DN50 11.0 105 95 56.0 59.15 50 2.00 51.0

DN80 149.0 136 130 71.0 90.15 80 4.00 125.0

D

F

EA

C

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

Tel: +44 (0)1242 521361 Fax: +44 (0)1242 573342E-mail: [email protected]

Internet: www.SpiraxSarco.com

Copyright 2000 Spirax Sarco is a registered trademark of Spirax-Sarco Limited

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