ERHARD is a company of Data sheet ERHARD non slam nozzle check valve
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ERHARD is a company of
Data sheet ERHARD non slam nozzle check valve
2ERHARD non slam nozzle check valve
ERHARD non slam nozzle check valve
The innovative non-return valve for maximum economy
An optimised flow cross-sectional area as well as a valve disc and valve stem
gasket designed for minimum flow resistance ensure minimum head losses
with the ERHARD non slam nozzle check valve. This enables highly economic
operation especially in pumping stations. Valve disc, spring and closing travel
have been engineered in such a way [2] that the ERHARD non slam nozzle check
valve reacts that quickly even in highest flow delays (e. g. in a vertical line) that
only minimal return flow velocities occur, with the flow being gently slowed,
thus reducing water hammers to a minimum.
Thanks to its compact form (face-to-face dimension to DIN EN 558, basic line
14), the adjustable spring force as well as its use in any installation position, the
ERHARD non slam nozzle check valve can be used for a wide range of applica-
tions up to pressure ratings of PN 40 in the natural and drinking water sector
as well as in purified wastewater. The body is made from spheroidal cast iron
EN-JS1030 (EN-JS1025 for PN 40), the body insert is made from bronze. The
resilient-seated piston is rubberised to W270. All internal parts can be easily
replaced and the guide bushes are maintenance-free. The ERHARD non slam
nozzle check valve is internally enamelled for protection against corrosion and
the outside has been coated with EKB in blue. Position indication is optionally
available [3].
1 2 3
Operating instructions
BA43E000
with position indication:
BA43E001
3ERHARD non slam nozzle check valve
The overview
Brief specifications:
•Valve disc (DN80-300): zinc-free bronze / elastomer KTW / W270
•Valve ring (DN350-600): 1.4404 / elastomer KTW / W270
•Internal body: zinc-free bronze
•Guiding stem: stainless steel
•Guiding bush: high-performance polymer
•Body: ductile cast iron
•Spring: stainless steel
•Protection outside: ERHARD EKB fusion bonded epoxy
•Protection inside: ERHARD vitreous enamel
Dimensions and weights
Area of operations
•Minimum back-pressure DN80-300: 4 mWS
•Minimum back-pressure DN350-600: 8 mWS
•Max. working temperature +60 °C
•Full opening at approx. 2 m / s
We need the following data for preparing
a quotation:
•Nominal size DN
•Temperature range
•Position of installation
•Pressure rating PN
•Flow velocities (min. / max.)
•Case of application
•Type of flow medium / analysis
•Characteristic curve of the plant
Please contact us. We will be glad to advise
you.
Nominal size DN
face-to-face dim. L(EN558-
basic line 14) mm
Weightapprox..
kg
Flange outside diameter Dmm
Locking (Hub) mm
PN10/16 PN 10 PN 16 PN 25 PN 40DN 80 180 14 – 200 200 200 19
DN 100 190 19 – 220 235 235 20DN 125 200 27 – 250 270 270 23DN 150 210 32 – 285 300 300 32DN 200 230 50 340 340 360 375 35DN 250 250 70 400 400 425 450 43DN 300 270 97 455 455 485 515 49DN 350 290 135 505 520 – – 39DN 400 310 165 565 580 – – 44DN 500 350 275 670 715 – – 56DN 600 390 480 780 840 – – 71
Hydraulic characteristic curves
kv-v
alue
(m3 /
h)
Flow velocity (m/s)
ζ = ( π · DN2
)2
DN ... mm78,57 · kv
kv-v
alue
(m3 /
h)
Flow velocity (m/s)
ζ = ( π · DN2
)2
DN ... mm78,57 · kv
00 1 2 3 4
500
1000
1500
2000
2500
3000
3500
4000
4500
5000
DN 300
DN 250
DN 200
DN 150
DN 125
DN 100DN 80
00
2500
5000
7500
10000
12500
15000
1 2 3
DN 600
DN 500
DN 400
DN 350
4ERHARD non slam nozzle check valve
0,1
1
100
10
0
100
70
50
40
60
90
80
30
20
10
0 1 2 3 4 5
0,1
1
100
10
0
100
70
50
40
60
90
80
30
20
10
0 1 2 3 4 5
0,1
1
100
10
0
100
70
50
40
60
90
80
30
20
10
0 1 2 3 4 50,1
1
100
10
0
100
70
50
40
60
90
80
30
20
10
0 1 2 3 4 5
0,1
1
100
10
0
100
70
50
40
60
90
80
30
20
10
0 1 2 3 4 5
0,1
1
100
10
0
100
70
50
40
60
90
80
30
20
10
0 1 2 3 4 5
Flow velocity (m/s)
Flow velocity (m/s)
Flow velocity (m/s) Flow velocity (m/s)
Flow velocity (m/s)
Flow velocity (m/s)
DN 80 PN 40, Zeta-value at 5 m / s: 0,85
DN 125 PN 40, Zeta-value at 5 m / s: 0,69
DN 200 PN 10 / 16, Zeta-value at 5 m / s: 0,51 DN 250 PN 10 / 16, Zeta-value at 5 m / s: 0,69
DN 100 PN 40, Zeta-value at 5 m / s: 0,63
DN 150 PN 10 / 16, Zeta-value at 5 m / s: 0,48
ζ-va
lue
[-]
ζ-va
lue
[-]
ζ-va
lue
[-]
ζ-va
lue
[-]
ζ-va
lue
[-]
ζ-va
lue
[-]
Pres
sure
loss
[mba
r]Pr
essu
re lo
ss [m
bar]
Pres
sure
loss
[mba
r]
Pres
sure
loss
[mba
r]Pr
essu
re lo
ss [m
bar]
Pres
sure
loss
[mba
r]
Zeta-Values
Diagrams valid for cavitation free operation.
5ERHARD non slam nozzle check valve
Zeta-value with increasing speed
Zeta-value with decreasing speed
Pressure loss Dp
0,1
1
100
10
0
100
70
50
40
60
90
80
30
20
10
0 1 2 3 4 5
0,01
0,1
1
1000
100
10
0
140
120
80
60
100
40
20
0 1 2 3 4
0,01
0,1
1
1000
100
10
0
100
80
60
90
40
20
10
30
50
70
0 1 2 3 4
0,01
0,1
1
1000
100
10
0
180
120
80
60
100
160
140
40
20
0 1 2 3 4
0,01
0,1
1
1000
100
10
0
120
80
60
100
40
20
0 1 2 3 4
Flow velocity (m/s)
Flow velocity (m/s)
Flow velocity (m/s)
Flow velocity (m/s)
Flow velocity (m/s)
DN 300 PN 10 / 16, Zeta-value at 5 m / s: 0,74
DN 400 PN 10 / 16
DN 600 PN 10 / 16
DN 350 PN 10 / 16
DN 500 PN 10 / 16
ζ-va
lue
[-]
ζ-va
lue
[-]
ζ-va
lue
[-]
ζ-va
lue
[-]
ζ-va
lue
[-]
Pres
sure
loss
[mba
r]Pr
essu
re lo
ss [m
bar]
Pres
sure
loss
[mba
r]
Pres
sure
loss
[mba
r]Pr
essu
re lo
ss [m
bar]
Zeta-Values
Diagrams valid for cavitation free operation.
Your Choice in Waterflow Control
TALIS is the undisputed Number One for water transport and water flow control. TALIS has the best solutions availa-ble in the fields of water and energy management as well as for industrial and communal applications. We have nu-merous products for comprehensive solutions for the whole water cycle – from hydrants, butterfly valves and knife gate valves through to needle valves. Our experience, innovative technology, glo-bal expertise and individual consultation processes form the basis for developing long-term solutions for the efficient treatment of the vitally important resource “water”.
ERHARD GmbH & Co. KGPostfach 1280D-89502 HeidenheimMeeboldstrasse 22D-89522 HeidenheimPhone: +49 7321 320-0Fax: +49 7321 320-491E-Mail: [email protected]: www.erhard.de
Note: Specifications may be changed without notification at any time.Copyright: No copying without express written permission of ERHARDERHARD is a Registered Trademark. 46249 EN (12/12)
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