Pipeline ancillaries

Disc, split disc and wafer check valves

Dimensions/weights (approximate) in mm and kg

Size

DN15

DN20

DN25

DN32

DN40

DN50

DN65

DN80

DN100 184.0 154

Weight

60.0

69.5

80.5

90.5

38 16.0

29.0

0.13

45 19.0

35.7

0.19

55 22.0

44.0

0.32

68 28.0

54.5

0.55

101.0

115.0

142.0 115

154.0 133

0.74

93 40.0

77.0

1.25

113 46.0

97.5

1.87

128 50.0 111.5

2.42

148 60.0 130.0 100

3.81

79 31.5

65.5

Kv values

4.4

6.8 10.8 17

80 100

113

For conversion: Cv (UK) = Kv x 0.963

Cv (US) = Kv x 1.156

Opening pressures in mbar

Differential pressures with zero flow for standard and high

temperature springs.

è Flow direction

65 80 100

30 31 33

è

22.5 22.5 22.5 23.5 24.5 24.5 25 25.5 26.5

20 20 20

Where 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 3.5 4.0 4.5

Heavy duty springs approximately 700 mbar

5.5

6.5

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Pressure loss diagram

Safety information, installation and maintenance

For full details see the Installation and

Maintenance Instructions (IM-P134-07)

supplied with the product.

DCV disc check valves must be fitted

*

in accordance with the direction of flow

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arrow indicating correct fluid flow

direction. When fitted with a spring they

can be installed in any plane. When

supplied without a spring they must be

fitted in a vertical flow line with the flow

from bottom-to-top.

The 'cam' design of the body allows

the various flange types to be

accommodated. The body is rotated to

touch the flange joint bolts ensuring

that the valve is centred in the pipeline.

*

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*Note:

Flanges, bolts (or studs), nuts and joint gaskets are to

be provided by the installer. Disc check valves are non-maintainable

(no spares are available). Disc check valves are not suitable

for use where heavily pulsating flow exists, such as close to

a compressor.

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Where: Vw

V = Volume of fluid l/s or m3/h

Pressure loss in bar

Pressure loss diagram with open valve at 20°C. 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.

Various options are denoted by a marking on the valve body:-

The curves given in the chart are valid for water at 20°C. To

determine the pressure for other fluids the equivalent water volume

flowrate must be calculated and used in the graph.

Vw =

1000

x V

– Standardmetaldisc

– Standard metal disc

– Viton soft faced disc

– EPDM soft faced disc

– Viton soft faced disc

– EPDM soft faced disc

– Viton soft faced disc

– EPDMsoftfaceddisc

'W'

– Without spring

'H'

– Heavy duty spring

'V'

– Standard spring

'E'

– Standard spring

'WV' – Without spring

'WE' – Without spring

'HV' – Heavy duty spring

'HE' – Heavy duty spring

'T'

– Valves tested to EN 12266-1 Rate D

No identification indicates a standard spring with a metal disc.

Disposal

If a product which contains a Viton component has been subjected

to a temperature approaching 315°C or higher, then it may have

decomposed and formed hydrofluoric acid. Avoid skin contact and

inhalation of any fumes as the acid will cause deep skin burns and

damage to the respiratory system. Viton must be disposed of in a

recognised manner as stated in the Installation and Maintenance

Instructions (IM-P134-07). No other ecological hazard is anticipated

with the disposal of this product providing due care is taken.

= Equivalent water volume flow in l/s or m3/h

= Density of fluid kg/m3

Pressure loss information for steam, compressed air and gases is

available from Spirax Sarco.

How to order

Example: 1 off Spirax Sarco DN50, DCV1 bronze disc check valve

for fitting between EN 1092 PN25 flanges.

TI-P134-05 ST Issue 9

DCV1 Disc Check Valve

7.6.2

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