Pipeline ancillaries
Disc, split disc and wafer check valves
Dimensions/weights (approximate) in mm and kg
A*
B
C
D
E Weight
DN15
16.0
DN20
19.0
DN25
22.0
DN32
28.0
DN40
31.5
DN50
40.0
DN65
46.0
DN80
50.0
DN100
PN16 60.0
PN40 60.0
* EN 558 part 1, series 49
Kv values
DN 15
20
25
32
Kv 4.4 6.8 10.8 17
For conversion:
Cv (UK) = Kv x 0.963
Opening pressures in mbar
53
15
65
63
20
72
72
25
78
84
32
93
23.0 0.18
28.0 0.27
33.8 0.40
41.8 0.67
49.8 0.90
59.8 1.45
75.8 2.14
90.8 2.69
111.8 4.36
111.8 4.36
94
40
109
50
129
65
144
80
164
100
169
100
104
115
138
152
171
174
D
40
50
65
80
100
60
80
113
Cv (US) = Kv x 1.156
26
43
Differential pressures with zero flow for standard and high
temperature springs.
Flow direction
DN 15
20
25
32
40
50
65
80
100
25
25
25
27
28
29
30
31
33
22.5 22.5 22.5 23.5 24.5 24.5 25
25.5 26.5
20
20
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.
B
E
C
A
Without spring
2.5 2.5 2.5 3.5 4
4.5 5
Heavy duty springs approximately 700 mbar
Pressure loss diagram
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Safety information, installation and maintenance
For full details see the Installation and Maintenance Instructions
(IM-P601-02) supplied with the product.
DCV8 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.
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Pressure loss in bar
* 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.
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:-
'N'
– High temperature spring – Standard metal disc
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.
'W'
– Without spring
'H'
– Heavy duty spring
'V'
– Standard spring
'E'
– Standard spring
No identification indicates a standard spring with a metal disc.
*
*
Vw =
x V
– Standard metal disc
– Standard metal disc
– Viton soft faced disc
– EPDM soft faced disc
1000
= Equivalent water volume flow in l/s or m3/h
Where: Vw
V = Volume of fluid l/s or m3/h
Pressure loss information for steam, compressed air and gases is
available from Spirax Sarco.
How to order
Example: 1 off Spirax Sarco DN25, DCV8 disc check valve for
fitting between DIN 2501 / EN 1092 DN25 PN40 flanges.
Disposal
If a product that 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-P601-02). No other ecological hazard is anticipated
with the disposal of this product providing due care is taken.
= Density of fluid kg/m3
TI-P601-01 ST Issue 11
DCV8 Disc Check Valve
7.6.14
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