erhard product range non return valves types: tilting disc check valvedn 150 - 1400pn 10 - 40 dn 80...
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![Page 1: Erhard product range Non return valves Types: tilting disc check valveDN 150 - 1400PN 10 - 40 DN 80 - 600PN 10 - 40 swing check valveDN 40 - 800PN 10](https://reader036.vdocument.in/reader036/viewer/2022062300/56649da65503460f94a91323/html5/thumbnails/1.jpg)
Erhard product range
Non return valves
Types:
tilting disc check valve DN 150 - 1400 PN 10 - 40
DN 80 - 600 PN 10 - 40
swing check valve DN 40 - 800 PN 10 - 16
reflux valve DN 40 - 300 PN 10 - 16
„ECR“ check valve DN 40 - 600 PN 10 - 25
ball check valve DN 50 - 350 PN 10
diaphragm check valve DN 40 - 400 PN 10
Sizes:
Pressure:
DN 40 - DN 1400
PN 10 – PN 40
NON SLAM nozzle“ type check valve
![Page 2: Erhard product range Non return valves Types: tilting disc check valveDN 150 - 1400PN 10 - 40 DN 80 - 600PN 10 - 40 swing check valveDN 40 - 800PN 10](https://reader036.vdocument.in/reader036/viewer/2022062300/56649da65503460f94a91323/html5/thumbnails/2.jpg)
Erhard product range
Non return valves
Criteria for selection:
flow media (water, sewage)
size
pressure rating
headloss
space requirement
closing time (damping)
indication of position (visual, electric)
price
![Page 3: Erhard product range Non return valves Types: tilting disc check valveDN 150 - 1400PN 10 - 40 DN 80 - 600PN 10 - 40 swing check valveDN 40 - 800PN 10](https://reader036.vdocument.in/reader036/viewer/2022062300/56649da65503460f94a91323/html5/thumbnails/3.jpg)
SWING type check valve
Non return valves
Design with external shaft – lever and weight
Design with internal shaft
SWING type check valveSWING type check valveDN 40 – 800 PN 10 -16
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SWING type check valve
Non return valves
preferably for sewage (nearly full passage)
lever and weight (adjustability)
valve disc in stainless steel up to DN 300
with O-Ring seal
SWING type check valveSWING type check valve
Features:
![Page 5: Erhard product range Non return valves Types: tilting disc check valveDN 150 - 1400PN 10 - 40 DN 80 - 600PN 10 - 40 swing check valveDN 40 - 800PN 10](https://reader036.vdocument.in/reader036/viewer/2022062300/56649da65503460f94a91323/html5/thumbnails/5.jpg)
Tilting disc check valve
Non return valves
with lever and weightdesign with hydraulic damping
DN 150 – 1400 PN 10 - 40
![Page 6: Erhard product range Non return valves Types: tilting disc check valveDN 150 - 1400PN 10 - 40 DN 80 - 600PN 10 - 40 swing check valveDN 40 - 800PN 10](https://reader036.vdocument.in/reader036/viewer/2022062300/56649da65503460f94a91323/html5/thumbnails/6.jpg)
Non return valves
Tilting disc check valve
Features:
![Page 7: Erhard product range Non return valves Types: tilting disc check valveDN 150 - 1400PN 10 - 40 DN 80 - 600PN 10 - 40 swing check valveDN 40 - 800PN 10](https://reader036.vdocument.in/reader036/viewer/2022062300/56649da65503460f94a91323/html5/thumbnails/7.jpg)
Tilting disc check valve
Seat ring of stainless steel
O-Ring for resilient seating
Non return valves
![Page 8: Erhard product range Non return valves Types: tilting disc check valveDN 150 - 1400PN 10 - 40 DN 80 - 600PN 10 - 40 swing check valveDN 40 - 800PN 10](https://reader036.vdocument.in/reader036/viewer/2022062300/56649da65503460f94a91323/html5/thumbnails/8.jpg)
Tilting disc check valveDesign:
Non return valves
![Page 9: Erhard product range Non return valves Types: tilting disc check valveDN 150 - 1400PN 10 - 40 DN 80 - 600PN 10 - 40 swing check valveDN 40 - 800PN 10](https://reader036.vdocument.in/reader036/viewer/2022062300/56649da65503460f94a91323/html5/thumbnails/9.jpg)
Non return valves
Principle of hydraulic damping cylinder
Valve in fully open position
![Page 10: Erhard product range Non return valves Types: tilting disc check valveDN 150 - 1400PN 10 - 40 DN 80 - 600PN 10 - 40 swing check valveDN 40 - 800PN 10](https://reader036.vdocument.in/reader036/viewer/2022062300/56649da65503460f94a91323/html5/thumbnails/10.jpg)
Non return valves
Principle of hydraulic damping cylinder
Valve 45° closed
Valve closes without damping
Oil has free movement
![Page 11: Erhard product range Non return valves Types: tilting disc check valveDN 150 - 1400PN 10 - 40 DN 80 - 600PN 10 - 40 swing check valveDN 40 - 800PN 10](https://reader036.vdocument.in/reader036/viewer/2022062300/56649da65503460f94a91323/html5/thumbnails/11.jpg)
Non return valves
Principle of hydraulic damping cylinder
Valve closed
Oil must pass the flow control valve
damped closing
![Page 12: Erhard product range Non return valves Types: tilting disc check valveDN 150 - 1400PN 10 - 40 DN 80 - 600PN 10 - 40 swing check valveDN 40 - 800PN 10](https://reader036.vdocument.in/reader036/viewer/2022062300/56649da65503460f94a91323/html5/thumbnails/12.jpg)
Tilting disc check valve
Examples for use of hydraulic damping:
Non return valves
![Page 13: Erhard product range Non return valves Types: tilting disc check valveDN 150 - 1400PN 10 - 40 DN 80 - 600PN 10 - 40 swing check valveDN 40 - 800PN 10](https://reader036.vdocument.in/reader036/viewer/2022062300/56649da65503460f94a91323/html5/thumbnails/13.jpg)
Tilting disc check valveHeadloss characteristic
Non return valves
![Page 14: Erhard product range Non return valves Types: tilting disc check valveDN 150 - 1400PN 10 - 40 DN 80 - 600PN 10 - 40 swing check valveDN 40 - 800PN 10](https://reader036.vdocument.in/reader036/viewer/2022062300/56649da65503460f94a91323/html5/thumbnails/14.jpg)
Tilting disc check valve
Full opening device (opening cylinder)
Non return valves
Pneumatic cylinder
Valves is in fully open position also at low flow velocities
Low headloss
Energy saving
![Page 15: Erhard product range Non return valves Types: tilting disc check valveDN 150 - 1400PN 10 - 40 DN 80 - 600PN 10 - 40 swing check valveDN 40 - 800PN 10](https://reader036.vdocument.in/reader036/viewer/2022062300/56649da65503460f94a91323/html5/thumbnails/15.jpg)
Tilting disc check valve
Recommendation for installation:
Non return valves
![Page 16: Erhard product range Non return valves Types: tilting disc check valveDN 150 - 1400PN 10 - 40 DN 80 - 600PN 10 - 40 swing check valveDN 40 - 800PN 10](https://reader036.vdocument.in/reader036/viewer/2022062300/56649da65503460f94a91323/html5/thumbnails/16.jpg)
Tilting disc check valve
Arrangement of lever and weight:
Non return valves
![Page 17: Erhard product range Non return valves Types: tilting disc check valveDN 150 - 1400PN 10 - 40 DN 80 - 600PN 10 - 40 swing check valveDN 40 - 800PN 10](https://reader036.vdocument.in/reader036/viewer/2022062300/56649da65503460f94a91323/html5/thumbnails/17.jpg)
NON SLAM Nozzle check valve
Features:
silent closing
low headloss
short face- to face dimension
resilient seated
inside enamelled
DN 80- 600 PN 10 - 40
Non return valves
![Page 18: Erhard product range Non return valves Types: tilting disc check valveDN 150 - 1400PN 10 - 40 DN 80 - 600PN 10 - 40 swing check valveDN 40 - 800PN 10](https://reader036.vdocument.in/reader036/viewer/2022062300/56649da65503460f94a91323/html5/thumbnails/18.jpg)
DN 80 - 300 PN 10 - 40
Common features:
Internal body: zinc-free bronze
Outside: EKB epoxy Inside: vitreous enamel
Guide bushes: special plastic material
Guide rod, spring: stainless steel
ERHARD NON SLAM Nozzle Check Valve Types
DN 350 - 600 PN 10 - 16
Rubber-coated valve disc
Rubber-coated valve ring
![Page 19: Erhard product range Non return valves Types: tilting disc check valveDN 150 - 1400PN 10 - 40 DN 80 - 600PN 10 - 40 swing check valveDN 40 - 800PN 10](https://reader036.vdocument.in/reader036/viewer/2022062300/56649da65503460f94a91323/html5/thumbnails/19.jpg)
v0
a = dv/dt
vRmax
T0
TR
TS
time t
For
war
d flo
wR
eflu
xFlow velocity
Non Return Valves: Hydraulic Characteristics
Flow retardation
0 m/s
In short, steep pipelines, the water column stops quickly, i.e. flow retardation a is high !
In long, flat pipelines, the water column does not stop quickly, i.e. flow retardation a is low !
![Page 20: Erhard product range Non return valves Types: tilting disc check valveDN 150 - 1400PN 10 - 40 DN 80 - 600PN 10 - 40 swing check valveDN 40 - 800PN 10](https://reader036.vdocument.in/reader036/viewer/2022062300/56649da65503460f94a91323/html5/thumbnails/20.jpg)
0
0,2
0,4
0,6
0,8
1
1,2
1,4
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21
Flow retardation dv / dt in m / s²
Re
flu
x v
elo
cit
y v
in
m /
s
DIN
sw
ing
ch
eck
valv
e
Check valve with
slanted seat
Diaphragm check valve
Tilting disc check valve with
slanted seat and spring Nozzle check valve
ERHARD NON SLAM Nozzle Check Valve
Tilti
ng d
isc
chec
k va
lve
with
wei
ght-l
oade
d le
ver
Reflux Preventers: Dynamic Characteristics
Long, flat pipelines
Short, steep pipelines
![Page 21: Erhard product range Non return valves Types: tilting disc check valveDN 150 - 1400PN 10 - 40 DN 80 - 600PN 10 - 40 swing check valveDN 40 - 800PN 10](https://reader036.vdocument.in/reader036/viewer/2022062300/56649da65503460f94a91323/html5/thumbnails/21.jpg)
Waterhammer:
Max waterhammer according to formula of „Joukowsky“
p
av
g
= max. waterhammer (m WC)
= surgewave velocity in water ( = 1200m/s)
= change in flow velocity (m/s)
= acceleration of earth (m/s²)
g
vap
Non return valves
![Page 22: Erhard product range Non return valves Types: tilting disc check valveDN 150 - 1400PN 10 - 40 DN 80 - 600PN 10 - 40 swing check valveDN 40 - 800PN 10](https://reader036.vdocument.in/reader036/viewer/2022062300/56649da65503460f94a91323/html5/thumbnails/22.jpg)
Calculation of the max. waterhammer at different reflux velocities
)(12281,9
11200WSmp
)(2481,9
2,01200WSmp
Non return valves
Reflux velocity – 1 m/s
Reflux velocity – 0,2 m/s
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Reflux check valve
DN 40 – 300 PN 10 - 16body with epoxy – enamel or rubber liningbody with epoxy – enamel or rubber lining
water and sewage
with rubberlined disc
Non return valves
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ball check valve
DN 50 – 350 PN 10DN 50 – 350 PN 10
for sewage
ball of steel rubber coated
epoxy coating
Non return valves
![Page 25: Erhard product range Non return valves Types: tilting disc check valveDN 150 - 1400PN 10 - 40 DN 80 - 600PN 10 - 40 swing check valveDN 40 - 800PN 10](https://reader036.vdocument.in/reader036/viewer/2022062300/56649da65503460f94a91323/html5/thumbnails/25.jpg)
diaphragm check valve
DN 40 – 400 PN 10
for water
soft closing
Non return valves
![Page 26: Erhard product range Non return valves Types: tilting disc check valveDN 150 - 1400PN 10 - 40 DN 80 - 600PN 10 - 40 swing check valveDN 40 - 800PN 10](https://reader036.vdocument.in/reader036/viewer/2022062300/56649da65503460f94a91323/html5/thumbnails/26.jpg)
„ECR“ check valve
DN 40 – 400 PN 10 - 25wafer type
for use in water
with NBR sealing
quick acting
Non return valves