Pipeline ancillaries
Disc, split disc and wafer check valves
Dimensions/weights (approximate) in mm and kg
ASME ASME
300
150
22.35
15 0.24
27.35
20 0.41
33.15
25 0.54
49.15
40 1.15
59.15
50 1.84
90.15
80 3.69
111.15
100 5.70
Size
A
B
C
D
E
F
Weight
DN15
DN20
DN25
DN40
DN50
DN80
DN100
181
54
47
38
25
67
57
46
31
73
67
54
35
95
86
76
45
111
105
95
56
149
136 130
71
174 160
80
Kv values
DN
15
Kv
4.4
7.5
12
26
39
84
150
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.
Flow direction
DN
15
20
25
40
50
80
100
25
25
25
28
29
31
33
22.5
22.5
22.5
24
24.5
25.5 26.5
20
20
20
20
20
20
20
Where lowest opening pressures are required, valves without
springs can be installed in vertical pipes with bottom-to-top flow.
20
25
40
50
80
100
B
Centering dimension for ASME 150
A
Centering dimension for ASME 300
E
Without spring
2.5
2.5
2.5
4.0
Pressure loss diagram
D
4.5
5.5
6.5
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Safety information, installation and maintenance
For full details see the Installation and
Maintenance Instructions (IM-P134-08)
supplied with the product.
*
DCV4 disc check valves must be fitted
in accordance with the direction of flow
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.
*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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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
– Standard metal disc
– Standard metal disc
– Viton soft faced disc
– EPDM soft faced disc
– Viton soft faced disc
– EPDM soft faced disc
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-P134-08). No other ecological hazard is anticipated
with the disposal of this product providing due care is taken.
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'N'
– High temperature spring
'W'
– Without spring
'V'
– Standard spring
'E'
– Standard spring
Where: Vw
V = Volume of fluid l/s or m3/h
'WV' – Without spring
'WE' – Without spring
'T'
– Valves tested to EN 12266-1 Rate D
No identification indicates a standard spring with a metal disc.
= Equivalent water volume flow in l/s or m3/h
= Density of fluid kg/m3
Disposal
Pressure loss information for steam, compressed air and gases
is available from Spirax Sarco.
How to order
Example: 1 off Spirax Sarco DN40, DCV4 stainless steel disc
check valve for fitting between ASME 300 flanges.
TI-P134-04 ST Issue 11
DCV4 Disc Check Valve
7.6.6
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