BERMAD 435 User manual

Instruction manual Bermad surge anticipation manual
Model No 435
Bermad Water Technologies Rev 0 5/05/2015
7 Inglewood Drive , Thomastown Vic 3074
Ph [phone] 1 www.bermad.com.au
Installation and operation
Manual
Bermad Surge Anticipation Valve
Model No 435

Instruction manual Bermad surge anticipation manual
Model No 435
Bermad Water Technologies Rev 0 5/05/2015
7 Inglewood Drive , Thomastown Vic 3074
Ph [phone] 2 www.bermad.com.au
Valve Description
The model No 435 Surge Anticipation Valve is an off line , hydraulically operated
diaphragm actuated control valve. The valve sensing the line pressure, opens in
response to the pressure drop associated with the rapid pump stoppage. The pre
opened valve dissipates the returning high pressure wave, eliminating the surge.
The model 435 closes drip tight as quickly as the relief feature allows, while
preventing closing surge.
The valve also acts as a quick pressure relief valve responding to sudden increases
in the line pressure.
Valve Technical Details
The following details relates to the technical specifications of the valve and
components.
Basic Valve Type : Bermad 400 series globe style hydraulic single chamber valve
Valve rating : 1600 Kpa max pressure
40Kpa minimum opening pressure
Valve material : Epoxy coated cast iron with rubber diaphragm
Valve Model : Model No IR-X-ASTE-435
Low Pressure Pilot : #2 Bermad pilot with grub screw removed on port Z
Pressure rating : 1600Kpa maximum pressure
Spring range : 100-1250 Kpa adjustment
Rotation of bolt : One rotation = 190Kpa approx
High Pressure Pilot : #3 Bermad pilot
Pressure rating : 1600Kpa maximum pressure
Spring range : 100-1250 Kpa adjustment
Rotation of bolt : One rotation = 190Kpa approx
Tubing : 3/8” copper with brass fittings (HP nylon optional)
Gauge : 0-1600Kpa dual scale 65mm liquid filled ¼” BSP inlet

Instruction manual Bermad surge anticipation manual
Model No 435
Bermad Water Technologies Rev 0 5/05/2015
7 Inglewood Drive , Thomastown Vic 3074
Ph [phone] 3 www.bermad.com.au
Installation and Sizing
We recommend the following installation considerations to ensure correct operation
of the valve.
1. Valve size. We recommend that the valve size be discussed with the
Bermad company for suitability of valve size for the application. In many
instances there may be more than 1 valve in the operation should there be
more than 1 pump in the network.
2. Installation of valve position. The best mode of installation is to have the
valve horizontal, as it makes maintenance of the valve simpler and avoids any
air pockets in the valve. Should the valve be fitted vertically, we suggest
modifications to the valve cover to ensure best operation. We rotate the
cover so tha the connection to the cover is at the highest location.
3. Installation of valve on pipeline. The valve should be installed in
accordance with the irrigation designer and Bermad valve recommendations.
This will usually be located at the or close to the pump station after the check
valves of the pump. The valves are usually mounted on a tee piece off the
main pipeline itself.
4. Installation of associated valves. We recommend that a form of isolating
valve (gate or butterfly) be mounted directly before the surge anticipation
valve for reasons of setting or maintenance. In addition to this we
recommend the use of a an anti-slam air valve be mounted in the main
pipeline to ensure there is no possibility of vacuum holding the valve closed
on the down-surge. Again the irrigation designer with Bermad can
recommend suitable valve sizing for the application. Bermad model C30-SP
or Fox-AS should be considered.
5. Discharge piping from surge valve. The size of the pipe leaving the surge
valve is critical to the safe operation of the valve. As the system velocity can
be as high as 12-15m/s velocity, we suggest the pipe size is considerably
larger than the valve size (in order to reduce system velocity) and the use of
bends and elbows be kept to a minimum in order to reduce thrust on the
pipework. The pipe must go to atmosphere and allow the surge to relieve
without back pressure. If running pipe down a river bank, vacuum breakers
(such as Bermad model 50mm C10) must be installed in order to avoid pipe
collapsure. This will also cause the valve to slam close which will also
generate a secondary pipe surge.

Instruction manual Bermad surge anticipation manual
Model No 435
Bermad Water Technologies Rev 0 5/05/2015
7 Inglewood Drive , Thomastown Vic 3074
Ph [phone] 4 www.bermad.com.au
Setting of the valve for operation
We suggest if there is any doubt in the operation or setting of the valve, you first
contact your irrigation supplier or Bermad for assistance.
1. Ensure the pipeline is fully charged and the pipe is full as in normal operation.
2. Ensure you have a copy of the pump curve to identify the operation of the
pumps.
3. Prior to opening the butterfly valve ensure the following is done to the Bermad
435 valve.
Open valve 1 and close valve 2
Turn adjustment bolt on low pressure pilot 2 anti-clockwise fully until
there is no tension on the spring.
Turn adjustment bolt clockwise fully.
Turn needle valve on pilot #3 fully clockwise and tighten locknut.
Turn needle valve on pilot #2 clockwise fully and re-open ¼ of a turn.
4. Open the butterfly very slowly a small amount 1/8 turn to apply pressure to
the valve. When the pressure rises above 4m, the valve will open and as the
chamber fills, the valve will start to close as water enters the control chamber.
We suggest you carefully loosen a brass fitting on the copper tube to release
the air from the top chamber of the valve. Once the valve has closed and all
the milky water is gone, the valve is ready to be set.
5. The static pressure is now applied to the inlet side of the valve. Turn the low
pressure pilot adjustment bolt clockwise slowly until water starts to vent out
from the side of the pilot. The valve will start to open and will be limited as
the butterfly valve is only 1/8th open. Turn the adjustment bolt slowly anti-
clockwise until the water stops venting and the valve starts to close slowly.
Once the valve is closed continue to turn the adjustment bolt anti-clockwise
about 25% lower than the static pressure. For example if the static pressure
is 400Kpa, turn bolt anti-clockwise 1/2 of a turn. (remember 1 turn =
190Kpa).
6. Once the valve has closed, watch the pressure gauge to see that the valve
did not close too fast. If the valve closed too fast, you can adjust the needle
valve 21 on pilot #3. Turning clockwise to slow down. Anti-clockwise to
speed up.
7. It is time now to set the high pressure relief pilot. What we like to do is have
the valve open a small amount on pump start to relieve any upsurge. In some
pump stations there may not be an upsurge if the soft start is sensitive to the
system. When the pump starts, watch carefully to see how high the pressure
goes and then what it settles to when the pump is running. When the pump is
running, it is time to open valve 2 and set the pilot. Turn the adjustment bolt
anti-clockwise slowly until water vents to the down stream. Turn the bolt then
very slowly clockwise until the water stops venting.
8. It is now time to start and stop the pump several times to fine tune the
settings of the pilots. The valve is now set.

Instruction manual Bermad surge anticipation manual
Model No 435
Bermad Water Technologies Rev 0 5/05/2015
7 Inglewood Drive , Thomastown Vic 3074
Ph [phone] 5 www.bermad.com.au
Normal operation of the Surge Valve.
It is really important that the valve is always on line and ready to operate. Make sure
the following are always open.
Inlet butterfly valve must be open.
Inlet ball valve 1 and 2 must be open.
Inlet filter must be clean
Needle valve on #2 must notbe blocked
Drainage of the pipe.
It is really important to understand that should you decide to drain the pipe, the static
pressure will drop and the surge valves will all burst open and start draining the
system.
If you are gong to drain the pipe, you must first isolate the surge valves
to stop excessive speed on emptying of the pipe.
Only re open the surge valves after the pipe has been re-charged.
Ensure that the pipeline air release valves are all open and functioning
as designed to avoid negative pressures in the pipeline
Maintenance.
We suggest the following is carried out every year :
Clean the inlet filter
Flush all the water out of the control chamber of the 400 series basic valve.
Check the inlet, outlet and bonnet connections to make sure there is no
blockage in any ports.
Close needle valve on the #2 pilot and re-open to the same set point.
Check al control pipeing is in good condition and gauges are in good working
order.
Make sure the anti-slam air valve has been stripped and cleaned.
Test function of the valves by starting and stopping the pumps.

BERMAD IR Spare Parts
400 Series
Effective 10/2014
Basic Control Valves For Irrigation (IR)
Sizes: ¾-10״; DN20-250
12

Effective 10/2014
BERMAD IR Spare Parts
400 Series
Basic Control Valves For Gardening (LS)
Sizes: ¾-2״; DN20-50
12a

BERMAD IR Spare Parts
400 Series
Effective 10/2014
Basic Control Valves (IR & WW)
Sizes: 12-14״; DN300-350
13b

Effective 10/2014
BERMAD IR Spare Parts
400 Series
Accessories
13c

Large Control Filter
BERMAD WW Spare Parts
Accessories
Effective: Jan/08
60
2-234 "O" ring
2-234 "O" ring
2-014 "O" ring
2-227 "O" ring
2-227 "O" ring

BERMAD Spare Parts
#3 2-way Pressure ustaining Pilot Valve
Pilots
2/05
46

BERMAD Spare Parts
#2 2-way Pressure Reducing Pilot Valve
Pilots
2/05
45