DCV
Wafer check valves
DCV wafer check valves
to prevent reverse flow . . .
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.
The DCV can be used in a wide variety of
applications including:
Hot and cold water system
Sprinkler installations
Steam and condensate lines
And in industries as diverse as:
Process lines
Heating systems
Oil lines
Chemicals
Pharmaceuticals
Ship building
Power generation
Food production
Pulp and paper
Textiles
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.
Seat options in stainless steel,
viton for oils and gases
and EPDM for water.
Spring options:
High temperature springs available.
Designed and manufactured
in accordance with
BS 7438: 1991
Heavy duty springs for boiler or gravity feedline applications.
2
No spring option for very low opening differential pressures.
(Vertical upward flow only).
. . . of
User benefits
DN80 comparison
Typical DN80 conventional swing check valve
Weight 27 kg
318 mm
➤
71 mm
●
Can be used with a wide variety of liquids,
gases and vapours.
●
Compact design for simple installation between
a wide range of flange types and in any plane.
●
Each DCV is designed to fit between a variety
of flange standards - simplifying and reducing
spares stock holdings.
●
Wide variety of body materials, seating and
springs allows product matching to the
specific application.
●
Computer aided product design and up to
the minute production methods ensures the
product is of the highest quality.
●
Materials of construction ensure low wear rates
with minimal maintenance.
●
Flow path design ensures low pressure drop.
➤
➤
➤
A typical DN80
Spirax Sarco DCV
Weight 3.6 kg
Product options
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:
DCV4
Austenitic 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 standards
In 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 / 8
DIN 3230 part 3, BO3 as standard.
Soft seated versions meet DIN 3203 part 3 BN1 and BO1 provided a differential pressure exists.
DCV9
DIN 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 options
Stainless
steel disc
With
Viton
insert
With
EPDM
insert
Stainless
steel
spring
Heavy
duty
spring
High
temperature
spring
No
spring
DCV1
Standard
●
●
Standard
●
●
DCV2
Standard
●
●
Standard
●
●
DCV3
Standard
●
●
Standard
●
DCV4
Standard
●
●
Standard
DCV7
Standard
●
●
Standard
●
DCV8
Standard
●
●
Standard
●
DCV9
Standard
●
●
Standard
●
●
●
●
●
●
●
●
●
●
fluid passing through pipelines, in any industry.
3
Typical applications
Boiler
Feedtank
Steam boiler
flooding protection
When 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.
DCV2B
Prevention of reverse flow
DCV
Installed after multi-plex pump outlets in water
distribution systems to prevent reverse flow
during auto changeover sequencing and
stand-by use.
DCV
DCV
Vacuum breaker
Installed 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.
Flowmeter
DCV
Pipeline fitting protection
Prevents damage to pipeline fittings such as
flowmeters, control valves and strainers which
are susceptible to damage by reverse flow.
DCV
4
How DCV's work
Pressure loss diagrams
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.
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. The curves given in the chart are valid
for water at 20°C. To determine the pressure drop for
other fluids the equivalent water volume flowrate must
be calculated and used in the graph.
Q
xV
Vw =
1 000
Vw = Equivalent water volume flow in l / s or m³/ h
Q = Density of fluid kg / m³
V = Volume of fluid l / s or m³/ h
Pressure loss information for steam, compressed
air and gases are available from Spirax Sarco.
Ö
Open
Closed
Installation
30
20
00
DN1
0
8
N
D
5
DN6
0
DN5
0
DN4
2
3
N
D
5
DN2
0
2
N
D
5
DN1
30
20
10
5
3
2
10
5
3
2
1
0.5
0.3
0.2
1
0.5
0.01 0.02
These valves are not recommended for applications
where heavily pulsating flow exists, such as close to a
reciprocating compressor.
0.05 0.1 0.2
Pressure loss in bar
1
0.5
DCV4 (DN5-100), DCV9 (DN50 and 80 only)
200
Water flowrate in Vw m³ /h
100
50
30
20
00
DN1
50
30
20
DN8
10
0
5
3
2
10
0
DN5
0
4
N
D
5
5
DN2
3
2
0
DN2
1
5
DN1
0.5
1
0.3
0.2
0.01 0.02
0.05 0.1
0.2
Pressure loss in bar
0.5
1
Opening pressures in mbar
Disc and spring combinations
Differential pressures with zero flow for:
standard and high temperature springs
Disc
Size DN15
DN20
DN25
DN40
DN50
DN80 DN100
➔
Ô Flow direction
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
➔
➔
Spring
Valve body markings
High temperature spring
N
Without spring
W
Standard metal disc
Heavy duty spring
H
Standard spring
V
Without spring
WV
Viton soft faced disc
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
Water flowrate in Vw l / s
50
Water flowrate in Vw l / s
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.
DCV1, 2, 3, 7 and 8
100
Water flowrate in Vw m³ /h
The design of the Spirax Sarco DCV wafer check valve
allows installation between flanges in any plane and
with 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.
20.0
20.0
20.0
20.0
20.0
20.0
20.0
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
4.0
4.5
5.5
6.5
No identification indicates a standard spring with a metal disc.
5
DCV1, 2, and 3
DCV4
Sizes and pipe connections
Sizes and pipe connections
DN15, 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, 20
with the following exception: DN40, 50, 80 & 100 - will not fit between
JIS5 flanges. DN65 & 80 - will not fit between BS 10 table 'E'
Spring options
Heavy duty spring for sizes up to DN65. High temperature springs for
temperatures up to 400°C for all sizes of DCV3 models only
Soft seated disc options
Viton (for oils and gases) - temperature limits: -15°C to +250°C
EPDM (for water) - temperature limits: -50°C to +150°C
DN15, 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 400°C
Soft seated disc options
Viton (for oils and gases) - temperature limits: -15°C to +250°C
EPDM (for water) - temperature limits: -50°C to +150°C
Materials
Materials
DCV1
DCV2
DCV3
Bronze
Body
Ferritic stainless steel
Austenitic stainless steel
Disc
Austenitic stainless steel
Spring retainer
Austenitic stainless steel
Standard spring
Austenitic stainless steel
Heavy duty spring
Austenitic stainless steel
High temperature spring Nickel alloy
DIN W-Nr. 2.1050
DIN W-Nr. 1.4313
DIN W-Nr. 1.4581
BS 1449 316 S11
BS 1449 316 S11
BS 2056 316 S42
BS 2056 316 S42
Nimonic 90
Body
Austenitic stainless steel ASTM A351 CF3M
Disc
Austenitic stainless steel
BS 1449 316 S11
Spring retainer
Austenitic stainless steel
BS 1449 316 S11
Standard spring
Austenitic stainless steel
BS 2056 316 S42
Heavy duty spring
Austeitic stainless steel
BS 2056 316 S42
High temperature spring Nickel alloy
Limiting conditions
Limiting conditions
DCV1 DCV2 DCV3
Maximum body design conditions
PN16 PN40 PN40
PMO - Maximum operating pressure
bar g 16
40
40
With
standard
spring
°C
260
300
300
TMO °C 300
300
Maximum With heavy duty spring
operating With high temperature spring °C 400
temperature 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 +150
Cold hydraulic test pressure
bar g 24
-
Temperature °C
Temperature °C
400 A
300
E
200
100
0
0
Operating range
Steam
saturation curve
0
4
B
Steam
saturation curve
10
16
8
12
Pressure bar g
30
20
Pressure bar g
DCV2
and
DCV3
C
D
40
Temperature °C
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.
6
DCV4
ANSI 300
50
300
400
400
-196
-15 to +250
-15 to +250
76
Maximum body design conditions
PMO - Maximum operating pressure
bar g
With
standard
spring
°C
TMO With heavy duty spring
°C
Maximum
operating
With high temperature spring °C
temperature Without spring
°C
Minimum operating temperature
°C
Temperature limits with viton seat
°C
Temperature limits with EPDM seat
°C
Cold hydraulic test pressure
bar g
Operating range
260
200
150
100
50
0
Nimonic 90
400 A
300
E
200
100
0
0
B
DCV4
C
Steam
saturation curve
10
20
30
D
40
50
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.
DCV7 and DCV8
DCV9
Sizes and pipe connections
Sizes and pipe connections
DN15, 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 options
Heavy duty springs for sizes up to DN65 for boiler feed applications.
High temperature spring for all sizes of DCV8 models only,
maximum 400°C.
Soft seated disc options
Viton (for oils and gases) - temperature limits: -15°C to +250°C
EPDM (for water) - temperature limits: -50°C to +150°C
DN50 and 80 can be fitted between
ANSI Class 150 or 300 flanges
Spring options
High temperature spring for temperatures up to 400°C
Soft seated options
Viton (for oils and gases) - temperature limits: -15°C to +250°C
EPDM (for water) - temperature limits: -50°C to +150°C
Materials
Materials
DCV7
DCV8
Austenitic stainless steel (304) WS 1.4308
Austenitic stainless steel (316) WS 1.4581
Disc
Austenitic stainless steel BS 1449 316 S11
Spring retainer
Austenitic stainless steel BS 1449 316 S11
Standard spring
Austenitic stainless steel BS 1449 316 S42
Heavy duty spring
Austenitic stainless steel BS 1449 316 S42
High temperature spring Nickel alloy
Nimonic 90
Body
Body
Austenitic stainless steel ASTM A351 CF3M
Disc
Austenitic stainless steel BS 1449 316 S11
Spring retainer
Austenitic stainless steel BS 1449 316 S11
Standard spring
Austenitic stainless steel BS 2056 316 S42
High temperature spring Nickel alloy
Limiting conditions
Limiting conditions
DCV7
Maximum body design conditions
PMO - Maximum operating pressure
bar g
With standard spring
°C
TMO With heavy duty spring
°C
Maximum
operating
With high temperature spring °C
temperature Without spring
°C
Minimum operating temperature
°C
Temperature limits with viton seat
°C
Temperature limits with EPDM seat
°C
Cold hydraulic test pressure
bar g
400
300
400
-200
-196
-15 to +250
-50 to +150
60
Maximum body design conditions
PMO - Maximum operating pressure
bar g
With
standard
spring
°C
TMO With
heavy
duty
spring
°C
Maximum
operating
With high temperature spring °C
temperature Without spring
°C
Minimum operating temperature
°C
Temperature limits with viton seat
°C
Temperature limits with EPDM seat
°C
Cold hydraulic test pressure
bar g
Operating range
0
0
400 A
300 E
200
100
0
0
10
20
Pressure bar g
B
20
Pressure bar g
DCV8
C
400
A
300
E
200
100
0
0
B
Steam
saturation curve
10
20
DCV9
C
30
D
40
50
Pressure bar g
Steam
saturation curve
10
D 40
30
Temperature °C
Temperature °C
Temperature °C
Steam
saturation curve
100
400
-196
-15 to +250
-50 to +150
76
DCV7
C
E
DCV9
ANSI 300
50
250
-
DCV8
PN40
40
300
300
Operating range
300
200
Nimonic 90
D
30
40
The product must not be used in the red region.
A - B - D High temperature spring and without spring.
E - C - D Standard spring.
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.
7
Dimensions and weights
(approximate) in mm and kg
DCV1, 2 and 3
A
D
E
Weight
F
DCV2 Kv
DCV1 DCV3
Size
A
B
C
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
B
E
D
F
C
DCV4
Size
A
B C
D
E
F
Weight
DN15
54.0 47 38 25.0 22.35 15
0.24
DN20
67.0 57 46 31.0 27.35 20
0.41
DN25
73.0 67 54 35.0 33.15 25
0.54
DN40
95.0 86 76 45.0 49.15 40
1.15
DN50
111.0 105 95 56.0 59.15 50
1.84
DN80
149.0 136 130 71.0 90.15 80
3.69
DN100
181.0 174 160 80.0 111.15 100
5.70
Note: For DCV4 A = Centering dimension for ANSI 150
B = Centering dimension for ANSI 300
Kv
4.4
7.5
12.0
26.0
39.0
84.0
150.0
Size
DN50
DN80
B
A
E
DCV9
A
B C
11.0 105 95
149.0 136 130
D
E
F
56.0 59.15 50
71.0 90.15 80
Weight
2.00
4.00
Kv
51.0
125.0
D
E
F
16.0 29.0 15
19.5 36.0 20
22.5 44.0 25
28.0 54.5 32
32.0 65.5 40
40.0 76.5 50
46.0 98.0 65
50.0 111.0 80
60.0 130.0 100
60.0 130.0 100
Weight
0.25
0.40
0.55
0.85
1.10
1.80
2.60
3.30
5.50
5.50
Kv
4.4
6.8
10.0
17.0
26.0
43.0
60.0
80.0
113.0
113.0
D
F
C
DCV7 and 8
A
52.5
62.5
72.0
83.5
93.5
108.0
128.0
143.0
PN16 164.0
DN100
PN40 169.0
B
-
C
51
61
70
82
92
107
127
142
164
167
A
E
D
F
C
DCV
Size
DN15
DN20
DN25
DN32
DN40
DN50
DN65
DN80
Some of the products may not be available in certain markets.
Spirax-Sarco Limited, Charlton House,
Cheltenham, Gloucestershire, GL53 8ER UK.
Tel: +44 (0)1242 521361 Fax: +44 (0)1242 573342
E-mail: Enquiries@SpiraxSarco.com
Internet: www.SpiraxSarco.com
© Copyright 2000
8
Spirax Sarco is a registered trademark of Spirax-Sarco Limited
SB-S35-01
ST Issue 3