PDF, 784 KB - Bermad
PDF, 784 KB - Bermad
PDF, 784 KB - Bermad
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BERMAD Waterworks BERMAD Waterworks BERMAD Waterworks<br />
WD 700-ES Series WD 700-ES Series WD 700-ES Series<br />
Features & Benefits<br />
High Grade Specification<br />
Main Applications<br />
Body designed for very high cavititation resistance<br />
Cavitation is a physical phenomenon, which can arise in liquids. It describes the transition phase between liquid and vapor<br />
conditions caused by high flow velocity.<br />
The ES valve body and internal design, allows the cavitation energy to dissipate without causing any damage to the valve.<br />
Position Indicator<br />
Nuts & Bolts: St. Steel<br />
Double Chamber<br />
Actuator<br />
Internal Trim: St. Steel<br />
V-Port: Plug<br />
Pressure Ratings:<br />
PN 16 / PN 25<br />
Pressure Reducing Systems<br />
Establishing various pressure zones is one of<br />
the most common means to achieve balance in<br />
water transmission and distribution networks.<br />
Pressure-Reducing Valves (PRV) “force” the<br />
dynamic parameters of the supply system into<br />
a constant predetermined delivery pressure.<br />
"Active PRV," through definition of minimum<br />
B<br />
required pressure at each pressure zone’s critical<br />
point, enables continuous readjustment of<br />
delivery pressure. This allows the system to work<br />
at a lower average pressure, to reduce water<br />
leaks and reduce burst frequencies.<br />
Pressure Relief / Sustaining Applications<br />
Cavitation Guide<br />
Valve Body:Y Pattern<br />
("Semi-Straight Flow")<br />
1<br />
2<br />
Pressure-Relief/Sustaining Valves protect pumps<br />
and water distribution systems from two extreme<br />
situations:<br />
1) When installed off-line, they relieve damaging<br />
excessive pressure.<br />
2) When installed in-line, they sustain minimum<br />
back-pressure thus prioritizing pressure zones,<br />
preventing line emptying, pump overload, etc.<br />
Because of the very high cavitation resistance, the cavitation damage zone in the WD-ES valves is much smaller than in standard<br />
valves. An inlet/outlet pressure ratio of about 12:1 can be reached, adding a large operational area to better utilize the valve.<br />
Raised Seat / Wide Body<br />
for anti-cavitation<br />
Body: Ductile Iron<br />
FB Epoxy Coating<br />
RAL 5005: 250μ<br />
5<br />
700 Series - Standard Valves<br />
5<br />
700 Series ES Valves<br />
Flange to Flange length according to ISO/EN Standards<br />
Level Control Valves<br />
Outlet Pessure / Bar<br />
4<br />
3<br />
2<br />
1<br />
Cavitation Free Zone<br />
press. ratio<br />
12/3.5 = 3.4<br />
Cavitation<br />
Damage Zone<br />
Outlet Pessure / Bar<br />
4<br />
3<br />
2<br />
1<br />
Cavitation Free Zone<br />
press. ratio<br />
12/1 = 12<br />
Cavitation<br />
Damage Zone<br />
ISO 9001-2000<br />
INTERNATIONAL<br />
WRAS, UK<br />
DVGW, Germany<br />
Groupe<br />
ACS, France<br />
Float controlled valves combine the advantages<br />
of excellent hydraulic control valves with the<br />
simplicity of mechanical floats. The ability to<br />
separate the main valve from the float eliminates<br />
most of the installation and maintenance<br />
problems associated with mechanical float valves.<br />
The wide selection of floats types makes Float<br />
Control Valves the solution wherever level control<br />
is required.<br />
0<br />
0 2 4 6 8 10 12 14 16 18 20<br />
Inlet Pessure / Bar<br />
0<br />
0 2 4 6 8 10 12 14 16 18 20<br />
Inlet Pessure / Bar<br />
General guide. For optimum conditions please consult <strong>Bermad</strong>.<br />
GOST, Russia ÖVGW, Austria BELGAQUA, Belgium NSF 61, USA