Non Returne Valves
Non Returne Valves
Non Returne Valves
A2
Page
DISCO Non-Return Valves
Gravity Circulation Checks and DISCO Non-Return Valves
for sanitation applications and hvac systems.
Type SBO 11, Type SBO 21, Type SBO 31 ............................................................ 29
Type RK 70, Type RK 71 .................................................................................. 30 – 31
Type MB 14 .............................................................................................................. 30
DISCO Non-Return Valves for industrial applications and hvac systems.
Type RK 41, Type RK 44, Type RK 44 S ........................................................ 32 – 33
Type RK 76 ...................................................................................................... 32 – 33
Type RK 86 ...................................................................................................... 34 – 35
Type RK 86 A .................................................................................................. 34 – 35
DISCO Non-Return Valves for special applications.
Type RK 16 A, Type RK 16C .......................................................................... 36 – 37
Type RK 49 ...................................................................................................... 36 – 37
GESTRA –
always
one step
ahead.
Application
Outlet: Screwed female
Inlet: Union nut
Downstream of circulating pumps in heating and hot water installations to
prevent gravity circulation.
SBO 11 Dimensions
A2
Outlet: Screwed male Type SBO 11 SBO 21 SBO 31
Inlet: Union nut
Size DN 1" 11/4" 1" 11/4" 3/4" 1" 11/4"
L [mm] 66 82 57 70 39 40 45
Connections Inlet2) G 11/2 G2 G 11/2 G2
G 11/4 G 11/2 G2
(BSP thread) Outlet G1 G 11/4 G1 G 11/4
L
Opening Pressures
Differential pressures at zero volume flow.
➞
1"
SBO 11 1 22 21 20
L
11/4"
1"
SBO 21 1 20 19 18
11/4"
3/4"
SBO 31 1" 2 24 22 20
SBO 31 11/4"
Curve 1: SBO 21 DN 1" Curve 3: SBO 21 DN 11/4" Curve 1: SBO 31 DN 3/4" Curve 3: SBO 31 DN 11/4"
Curve 2: SBO 11 DN 1" Curve 4: SBO 11 DN 11/4" Curve 2: SBO 31 DN 1"
29
Non-Return Valves RK – PN 6 to PN 16
Screwed Non-Return Valves MB – PN 16
Application
Type PN
For liquids, especially suited for heating and hot-water
RK 70 6 installations. Application as gravity circulation check and
check valve.
For liquids, gases, vapours. Application as gravity
RK 71 16
ØD
Body Material
Type Nominal sizes DN EN reference ASTM equivalent 1)
L RK 70 Body 15 – 100 mm Brass (CW617N) Brass
RK 70 / RK 71 Valve disk Plastic PPE –
DN 15 – 100 mm
Body 125 – 200 mm Grey cast iron (EN-JL 1040) A126 Class A
Plug Plastic Polyamid 6 –
RK 71 Body 15 – 100 mm Brass (CW617N) Brass
Valve disk 1.4571 AISI 316 Ti
MB 14 Body 15 – 100 mm Brass (CW614N) Brass
Valve disk 1.4571 AISI 316 Ti
1) ASTM material similar to EN material.
Observe different physical and chemical properties!
Dimensions
ØD
Pressure/Temperature Ratings
Type PN Nominal size (DN) PMA / TMA / [bar] / [°C]
RK 70 6 15 – 100 mm 6 / -30 1.5 / 100 0.5 / 130
6 125 – 200 mm 6 / -10 1.5 / 100 0.5 / 130
RK 71 16 15 – 100 mm 16 / -60 14 / 200 13 / 250
MB 14 16 1/2" – 2" 16 / -60 14 / 200 13 / 250
RK Designs
Type Seat Spring
metal-to- EPDM FPM PTFE without special Nimonic Earthing
metal spring spring spring connection
RK 70 (Plastic) – – – – – –
L Use
RK 71 X Use RK 41 Use Use RK 41 – RK 86
MB 14 RK 86
MB 14 X – – – – – – –
X : standard
– : not available
30
Non-Return Valves RK
PN 6 to PN 16
A2
40 4.0 13 9 5
50 4.5 14 9.5 5
65 5.0 15 10 5
80 5.5 16 10.5 5
100 6.5 18 11.5 5
RK 70*)
DN Opening pressures [mbar]
Direction of flow
without with spring
spring
➞
➞
➞
15 0.4 7.8 7.4 7
20 0.4 7.8 7.4 7
25 0.4 7.8 7.4 7
32 0.5 9 8.5 8
40 0.5 9.5 9 8.5
50 0.6 9.7 9.1 8.5
65 0.7 10.4 9.7 9
80 0.8 11.6 10.8 10
Volume flow VW
31
Non-Return Valves RK
PN 6 to PN 16
Application
Type PN
RK 41 16 For liquids, gases, vapours. Application as gravity circulation
RK 44 16 check, vacuum breaker, breather, foot valve, pressure-main-
RK 44S 16 taining valve, check valve.
RK 76 40 RK 41 especially suited for heating installations, RK 44 and RK 44S
for sea water and drinking water, RK 76 for industrial applications
ØD
Body Material
Type Nominal sizes (DN) DIN reference ASTM equivalent 1)
RK 41 Body 15 – 100 mm Special brass (CW710R) Special Brass
Valve disk 1.4571 AISI 316 Ti
Body 125 – 200 mm Grey cast iron (EN-JL 1040) A126 Class A
Plug 1.4006 A182 F6
RK 44 Body 15 – 100 mm Bronze (CC480 K-GS) B584 C90500
L Valve disk 1.4571 AISI 316 Ti
RK 41 / RK 44 / RK 44S Body 125 – 200 mm Grey cast iron (EN-JL 1040) A182 Class A
DN 15 – 100 mm
Plug Bronze (CC480 K-GS) B584 C90500
RK 44S Body 15 – 100 mm Bronze (CC480 K-GS) B584 C90500
Valve disk Bronze (CW352H) –
Body 125 – 200 mm Bronze (CC483 K-GC) B505 C90700
Plug Bronze (CC480 K-GS) B584 C90500
RK 76 Body 15 – 100 mm 1.4107 A217-CA15
Valve disk 1.4571 AISI 316 Ti
1) ASTM material similar to EN material.
Observe different physical and chemical properties!
Dimensions
ØD
Designs
Type Seat Springs
metal- EPDM FPM PTFE without special Nimonic- Earthing
to-metal (– 40 up to (– 25 up to (–190 up to spring spring spring connection
150 °C)1) 200 °C)1) 250 °C)1)
RK 41 X O O – O O –
RK 44 X O O – O O – Use
RK 44S X O O – O – – RK 86
RK 76
DN 15 – 100 mm RK 76 X O O O O O O
1) Observe pressure/temp. ratings of the equipment X : standard O : optional – : not available
32
Non-Return Valves RK – PN 6 to PN 40
Short overall length according to DIN EN 558-1, table 11, series 49
(^
= DIN 3202, part 3, series K4)
➞
➞
➞
insignificant deviations occur only within ➞
the range of partial opening. 15 2.5 10 7.5 5
ρ 20 2.5 10 7.5 5
· ·
VW = V · 1000 25 2.5 10 7.5 5
·
VW = Equivalent water volume flow 32 3.5 12 8.5 5
A2
in [l/s] or [m3/h]
40 4.0 13 9 5
ρ = Density of fluid
(operating condition) in [kg/m3] 50 4.5 14 9.5 5
· 65 5.0 15 10 5
V = Volume of fluid (operating
condition) in [l/s] or [m3/h] 80 5.5 16 10.5 5
100 6.5 18 11.5 5
125 12.5 35 22.5 10
150 14.0 38 24.0 10
200 13.5 37 23.5 10
(DN 125-200)
Volume flow VW
·
∇
Pressure drop p
33
Non-Return Valves RK – PN 6 to PN 40
Short overall length according to DIN EN 558-1, table 11, series 49
(^
= DIN 3202, part 3, series K4)
Body Material
Type Nominal sizes DN EN reference ASTM equivalent 1)
RK 86 Body 15 – 100 mm Chromium steel, 1.4317 A 743-CA6-NM
Valve disk 1.4571 AISI 316 Ti
Body 125 – 200 mm GP240GH (1.0619) A 216 WCB
Plug 1.4006 A182 F6
L RK 86A Body 15 – 200 mm 1.4408 A 351 CF 8M
RK 86 / RK 86 A Valve disk/plug 1.4571 AISI 316 Ti
DN 15 – 100 mm
1) ASTM material similar to EN material.
Observe different physical and chemical properties!
Dimensions
[mm] 15 20 25 32 40 50 65 80 100 125 150 200
Nominal sizes
n. [Inch] 1/2 3/4 1 11/4 11/2 2 21/2 3 4 5 6 8
mi
D
L 16 19 22 28 31.5 40 46 50 60 90 106 140
Overall
dimensions ∅ D min 44 53 64 73 83 96 110 128 151 – – –
[mm]
∅ D max 67 76 82 93 104 118 136 158 186 – – –
Class 125/150 – – – – – – – – – 194 220 275
PN 10/16 – – – – – – – – – 194 220 275
∅D PN 25 – – – – – – – – – 194 226 286
PN 40 – – – – – – – – – 194 226 293
Class 300 – – – – – – – – – 216 251 308
D max.
Weight [kg] 0.27 0.38 0.52 0.8 1.12 1.78 2.43 3.37 5.34 11 14 25
RK 86 / RK 86 A
DN 15 – 100 mm
Pressure/Temperature Ratings with metal-to-metal seat
Designs
ØD
➞
➞
➞
horizontal flow. With vertical flow ➞
insignificant deviations occur only within 15 2.5 10 7.5 5
the range of partial opening. 20 2.5 10 7.5 5
· · ρ 25 2.5 10 7.5 5
VW = V · 1000 32 3.5 12 8.5 5
·
VW = Equivalent water volume flow
A2
40 4.0 13 9 5
in [l/s] or [m3/h]
50 4.5 14 9.5 5
ρ = Density of fluid
(operating condition) in [kg/m3] 65 5.0 15 10 5
· 80 5.5 16 10.5 5
V = Volume of fluid (operating
condition) in [l/s] or [m3/h] 100 6.5 18 11.5 5
125 12.5 35 22.5 10
150 14.0 38 24.0 10
200 13.5 37 23.5 10
RK 86, 86 A
When selecting valve please consider:
Partial opening = Full opening =
instable range stable range
(DN 125-200)
Volume flow VW
·
∇
Pressure drop p
35
Non-Return Valves RK – PN 40 to PN 160
Short overall length according to DIN EN 558-2, table 11, series 52
(^
= DIN 3202, part 3, series K5)
Application
Type PN
For liquids, gases, vapours. Application as check valve,
breather, foot valve, pressure-relief valve or pressure-
RK 16 A 40/ class 300
maintaining valve.
RK 16 C 40/ class 300
RK 16 A and RK 16 C for aggressive fluids and low
RK 49 160
temperatures
ØD
Body Material
Type Nominal sizes DN EN reference ASTM equivalent 1)
RK 16A Body 15 – 100 mm 1.4571 AISI 316 Ti
Valve disk 1.4571 AISI 316 Ti
RK 16C Body 15 – 100 mm 2.4610 Hastelloy C
L
RK 16 A, RK 16 C Valve disk 2.4610 Hastelloy C
RK 49 Body 15 – 65 mm 1.4581 A351 CF8
Valve disk 1.4986 –
Body 80 – 200 mm 1.7357 A217 WC6
Plug 1.4922 –
1) ASTM material similar to EN material.
Observe different physical and chemical properties!
Dimensions
ØD
Designs
Type Seat Spring
metal- EPDM FPM PTFE without special Nimonic- Earthing
to-metal (– 40 up to (– 25 up to (–190 up to spring spring spring2) connection3)
150 °C)1) 200 °C)1) 250 °C)1)
RK 16A X O O O O O O O
RK 16C X – – – O – – O
RK 49 X – – – O – X O
L
RK 49, DN 80 – 200 mm
1) Observe pressure/temp. ratings of the equipment X : standard
2) Required for temperatures above 300 °C. O : optional
3) Earthing connection for DN 25 – 100 as standard. – : not available
DN 125 – 200 on request at extra cost.
36
Non-Return Valves RK – PN 40 to PN 160
Short overall length according to DIN EN 558-2, table 11, series 52
(^
= DIN 3202, part 3, series K5)
➞
➞
➞
flow. With vertical flow insignificant deviations V = Volume of fluid (operating ➞
occur only within the range of partial opening. condition) in [l/s] or [m3/h] 15 16.5 73 56.5 40
20 17.5 74 57.0 40
Opening Pressures Opening Pressures
25 18.0 76 58.0 40
Differential pressures at zero volume flow. Differential pressures at zero volume flow.
32 18.0 76 58.0 40
RK 16 A RK 16 C
A2
40 19.5 79 59.5 40
DN Opening pressures [mbar] DN Opening pressures [mbar]
50 22.0 84 62.0 40
Direction of flow Direction of flow
without with spring without with spring 65 23.0 87 63.0 40
spring spring 80 17.5 75 57.5 40
➞
➞
➞
➞
➞ ➞ 100 20.0 80 60.0 40
15 2.5 25 22.5 5 15 2.5 25 22.5 20
125 23.0 86 63.0 40
20 2.5 25 22.5 5 20 2.5 25 22.5 20
150 24.0 88 64.0 40
25 2.5 25 22.5 5 25 2.5 25 22.5 20
200 29.0 98 69.0 40
32 3.5 27 23.5 5 32 3.5 27 23.5 20
40 4.0 28 24.0 5 40 4.0 28 24.0 20
50 4.5 29 24.5 5 50 4.5 29 24.5 20
65 5.0 30 25.0 5 65 5.0 30 25.0 20
80 5.5 31 25.5 5 80 5.5 31 25.5 20
100 6.5 33 26.5 5 100 6.5 33 26.5 20
(RK 16C)
Volume flow VW
Volume flow VW
·
·
∇ ∇
Pressure drop p Pressure drop p
37
DISCOCHECK Dual-Plate Check Valves BB
DIN design DN 501) – 1200 mm, PN 6 – 1602)
Short overall length according to DIN EN 558-1, table 11, series 16
(^
= DIN 3202, part 3, series K 3)
Application
For liquids, gases, vapours. In heating, air-conditioning, water-supply and cooling
installations, steam and condensate systems, oil pipelines and natural gas lines.
For use with sea water, in sewage works, downstream of fans and compressors.
A For drinking water with Levasint3) lining, and for sea water with rubber lining.
With adjustable dampers for installations with waterhammer problems.
Metal-to-metal or soft seat (EPDM, FPM).
ØD
Materials
L Nominal size EN ASTM 4)
Design Part designation
DN 50 – 125 mm DN reference equivalent
Grey cast iron Body 150 – 1200 EN-JL 1040 A 126 Class A
(BB ... G) Dual plate 150 – 1200 EN-JS 1030 A 536 60-40-18
Carbon steel Body 100 + 125 1.0460 A 105
(BB ... C) Body ab 150 1.0619 A 216 WCB
Dual plate 100 + 125 1.4006 A 182 F6
A Dual plate ab 150 1.0619 A 216 WCB
Stainless steel Body 50 – 125 1.4404 A 182 F 316 L
(BB ... A) Body ab 150 1.4408 A 351 CF 8 M
ØD
38
DISCOCHECK Dual-Plate Check Valves BB
DIN design DN 50 – 1200 mm, PN 6 – 1601)
A2
6) From DN 150. For smaller sizes use DN “BB...A”
200 12 (18) 19 (25) 14 (20) 29 (41)
Type Damper7) Earthing Drain Springs 250 14 (18) 21 (25) 16 (20) 33 (41)
without
connection plug spring Inconel spring8) 2 WA10) 7 WA11) 5 VO 12) 300 15 (25) 22 (32) 17 (27) 35 (55)
BB.....G O – O O – O X O 350 17 (25) 24 (32) 19 (27) 39 (55)
BB.....C O O O9) O O O X O 400 19 (25) 26 (32) 21 (27) 43 (55)
7)
500 23 (28) 30 (35) 25 (30) 51 (61)
From DN 200 up to DN 800. X : standard O : optional – : not available
Max. temperature rating 110 °C, see page 41. Values indicated in brackets apply for BB
8) Inconel X 750 (Required for temperatures above 300 °C). Opening pressure 7 mbar (spring 7 WAI). 17/18/19.
9) From DN 150
10) Spring for 2 mbar opening pressure with horizontal installation.
11) Spring for 7 mbar opening pressure (standard) with horizontal installation.
12) Spring for 5 mbar opening pressure with vertical installation and downward flow.
· · ρ
VW = V · 1000
·
VW = Equivalent water volume flow
in [l/s] or [m3/h]
ρ = Density of fluid
(operating condition) in [kg/m3]
·
V = Volume flow of fluid
(operating condition) in [l/s] or [m3/h]
40
DISCOCHECK Dual-Plate Check Valves BB
DIN design DN 150 – 1200 mm, PN 6 – 1601)
BB with Lining
BB with lining from DN 150
Application
Design with LEVASINT® lining2): for drinking water. Design with rubber lining: for sea water.
Design with dampers: to solve waterhammer problems. Metal-to-metal or elastic seat
(EPDM, FPM)
1) For pressure ratings > PN 40 and sizes > DN 500 please ask for corresponding data
sheets.
2) LEVASINT® is a product of BAYER AG, Leverkusen.
Temperature Limits
A2
LEVASINT® lining –10 °C up to 70 °C
BB with Dampers
Application
To solve waterhammer problems in pipelines carrying liquids.To evaluate possible
waterhammer problems please ask for our questionnaire.
Pressure/Temperature Ratings
[mm] 200 250 300 350 400 500 600 700 800
Size DN
[inch] 8 10 12 14 16 20 24 28 32
Max. service pressure [bar] 16 16 13 9 13 9 5 8 6
Max. service temperature [°C] 110
Max. admissible pressure at
line leading to the valve
(pump switched off) [bar] 0.5
41
DISCO Swing Check Valves CB
DN 50 – 300 mm, PN 6 – 40
Application
Type PN For liquids, gases, vapours
CB 14 16 CB 14 for water and compressed air
CB 24 S 16 CB 24 S for sea water, drinking water, swimming-pool water
CB 26 40 For low temperatures
CB 26 A 40 CB 26 A for aggressive fluids, drinking water, or swimming-pool water
Material
∅D
Pressure/Temperature Ratings
Type Nominal sizes DN PN PMA / TMA / [bar] / [°C]
CB 14 50 – 300 16 16 / -10 6 / 60 4 / 80
CB 24 S 50 – 300 16 16 / - 200 16 / 90 2)13 / 2502)
50 – 200 40 40 / -10 30 / 200 20 / 350
CB 26
250 – 300 40 40 / -10 27 / 200 21 / 300
L CB 26 A 50 – 300 40 40 / -10 32 / 200 26 / 450
2) Max. pressure/temperature rating for CB 24 S without springs.
CB 14, DN 250 – 300 mm
CB Designs
Type Seat Springs
metal- NBR EPDM FPM PTFE4) without special
to-metal (– 30 up to (– 40 up to (–25 up to (–25 up to spring spring
110 °C)3) 150 °C)3) 200 °C)3) 200 °C)3)
CB 14 – X5) – – – X –
CB 24S O X O O – O –
CB 26 O – X O O O –
CB 26A O – X O O O –
a 3) Observe pressure / temp. ratings of the equipment 4) Cover FPM ring with PTFE X : standard
5) Flap made from NBR (Perbunan) Temp. range: –10 °C up to 80 °C O : optional
– : not available
Weights and Dimensions
Nominal size Dimensions [mm] Weight [kg]
DN CB 14 CB 24 S, CB 26, CB 26 A CB 26
CB14 CB 24S CB 26A
d
∅D
[mm] [in] D L a 6
d) D L a 6
d)
° 50 2 98 14 45 47 98 17 40 50 0.7 0.9 0.9
60
65 21/2 118 14 60 64 118 20 50 64 1.0 1.4 1.4
80 3 132 14 70 75 132 24 58 75 1.4 2.0 2.0
100 4 154 14 90 98 154 27 72 99 1.5 3.1 3.1
125 5 184 16 115 124 184 32 88 125 2.5 5.2 5.3
L 150 6 209 16 145 148 209 32 112 144 3.3 6.7 6.9
CB 24 S, CB 26, CB 26 A 200 8 264 18 185 196 264 42 150 198 5.5 13.7 14.1
DN 50 – 300 mm 250 10 319 35 220 242 319 47 182 244 11.2 22.9 23.6
300 12 375 43 270 288 375 52 216 292 14.0 32.8 33.8
6) Minimum flange bore and inside pipe diameter.
42 42
DISCO Swing Check Valves CB
DN 50 – 300 mm, PN 6 – 40
· · ρ
VW = V · 1000
·
VW = Equivalent water volume flow
A2
in [l/s] or [m3/h]
ρ = Density of fluid
(operating condition) in [kg/m3]
·
V = Volume flow of fluid
(operating condition) in [l/s] or [m3/h]
Opening Pressures
Differential pressures at zero volume flow.
Type DN Opening pressures
[mm] [mbar]
Direction of flow
➞
➞
➞
CB 14 50 – 150 8 0 1)
200 – 300 15 0
CB 24 S, CB 26, CB 26 A
Type DN Opening pressures
[mm] [mbar]
Direction of flow
with- with spring
out
spring
➞
➞
➞
CB 24 S 50 – 150 5 12 7
200 – 300 8 15 7
CB 26/ 50 – 80 5 12 7 1)
CB 26 A 100 – 150 11 18 7
200 – 300 18 25 7
1) Valves should not be used for down-
ward flow applications, since the spring
will not close the valve flap.
43
Swing Check Valves WB without spring,
DN 50 – 300 mm, PN 10/16
Application
WB 26 for liquids, gases and vapours
WB 26 A for aggressive fluids
a WB 24 S for sea water
Installation in horizontal or vertical lines with upward flow.
Materials
Type ASTM reference EN 1) equivalent
Body and flap AISI 420 1.4034
WB 26
galvanized galvanized
Body AISI 316 1.4401
Ø do
ØD
WB 26 A
Flap A 351 CF 8M 1.4408
WB 24 S Body and flap Aluminium bronze Aluminium bronze
O-rings NBR as standard
1) Physical and chemical properties comply with ASTM grade.
Pressure/Temperature Ratings
Nominal pressure PN 16
L
Design with O-rings2) NBR
WB 26, WB 26A, WB 24 S
DN 50 – 300 mm Max. service pressure [bar] 16
Related temperature [°C] 110
Min. temperature3) [°C] –10
2) O-rings in flap and valve faces made of NBR as standard.
3) Minimum temperature for nominal pressure rating.
WB Design
Type Seat Spring
metal-to- NBR EPDM FPM PTFE without special
metal (– 30 up to (– 40 up to (–25 up to (–25 up to spring spring
110 °C)4) 150 °C)4) 200 °C)4) 200 °C)4)
WB 24S O X Use O – X –
CB 26
WB 26 O X Use O Use X –
CB 26 CB 26
WB 26A O X Use O Use X –
CB 26A CB 26A
4)Observe pressure/temp. ratings
X : standard
O : optional
– : not available
· · ρ
VW = V · 1000
·
VW = Equivalent water volume flow
in [l/s] or [m3/h]
ρ = Density of fluid
(operating condition) in [kg/m3]
A2
·
V = Volume flow of fluid
(operating condition) in [l/s] or [m3/h]
Opening Pressures
Opening pressure zero when valve is
installed in horizontal line.
45
NAF-Check Valves
DN 40 – 1000 mm, PN 10 – 100
Application
L
for liquids, gases, vapours, aggressive fluids and
low temperatures.
∅D
65 108 46 12 1.7
80 128 64 16 3
526 620 / 30
10 – 40 100 158 64 26 5
528 620 / 30
125 180 70 36 7
150 203 76 51 9
200 263 89 71 16
NAF-Check 250 315 114 90 28
DN 40 – 1000 mm
300 370 114 125 41
350 432 127 146 48
400 480 140 175 65
450 530 152 188 94
526 520 / 30
10 – 25 500 592 152 228 115
528 520 / 30
Materials 600 692 178 282 192
Part Nominal size EN 700 804 229 301 270
Design ASME / SS
designation DN [mm] equivalent
800 911 241 374 402
40 + 50 SS 2343 1.4436
1000 1124 300 458 782
Body 65 – 250 ASTM A 351 CF 8M 1.4408
65 125 46 12 3
Steel 300 – 1000 ASTM A 216 WCC 1.0619
80 138 64 16 4
40 + 50 SS 2395 1.4439
Disc 100 158 64 26 5
65 – 1000 SS 2387 1.4317
125 188 70 39 9
40 + 50 SS 2343 1.4436
Stainless Body 150 222 76 52 11
65 – 1000 ASTM A 351 CF 8M 1.4408 526 822 / 32 40 – 100
steel 200 275 89 73 23
Disc 40 – 1000 SS 2324 1.4470
250 335 114 93 45
High-tempe- Body 65 – 400 ASTM A 217 WC 6 1.7557
300 394 114 131 57
rature steel Disc 65 – 400 ASTM A 217 WC 6 1.7557
350 435 127 151 75
400 4) 490 140 177 98
4) DN 400 mm only for PN 40/63.
Pressure/Temperature Ratings
Max. service pressure [bar] / related temperatures [°C]3)
Design Type PN DN [mm]
20 100 150 200 250 300 350 400 450 500 525
Steel down to 526 620 / 30 40 40 – 250 40 40 40 38 36 32 25 18 11 – –
–10 °C at nominal pressure 526 520 / 30 25 300 – 1000 25 25 25 24 22 20 15 11 6 – –
Stainless steel down to 528 620 / 30 40 40 – 250 40 33 31 29 28 26 26 – – – –
–40 °C at nominal pressure 528 520 / 30 25 300 – 1000 25 20 19 18 17 16 16 – – – –
High-temperature steel
down to –10 °C at 526 822 / 32 100 65 – 400 100 100 100 100 100 100 100 97 85 54 37
nominal pressure
3) Max. service temperature for valve with spring + 300 °C.
46
NAF-Check Valves
DN 40 – 1000 mm, PN 10 – 100
A2
in [l/s] or [m3/h]
ρ = Density of fluid
(operating condition) in [kg/m3]
·
V = Volume flow of fluid
(operating condition) in [l/s] or [m3/h]
47
GESTRA-DISCOCHECK
Dual-Plate Check Valves and
DISCO Swing Check Valves
GESTRA's extensive
customer adaptation and
uncompromising quality
standards guarantee
outstanding product
reliability coupled with Leakproof body
economic efficiency and The body of the dual-plate check
increased plant safety. valve has no external through-hole,
hence no need for unnecessary plate
replacements due to a leaky valve
body.