for Water Supply Equipments, Air Conditioning Equipments, and Kitchen instrument etc.prevent backflow caused by back siphonage
FEATURES
This product can rapidly introduce air
into feed pipe when there is negative
pressure in the pipe and prevent
backflow due to back siphonage.
It is suitable to install at unprepared
space of air gap and vacuum breaking
for back siphonage.
It can be used at indoor without being around
dirty by leaking from disc during operation due
to built in connection of discharge piping.
Strainers embedded at the feed pipe side and
air inlet side, prevent entry of dust etc.
SPECIFICATIONS
Model name
VD-5N
Code name
VD5N-F
20( ¾" )
Size
Water and hot water
Applicable fluid
5~90℃
Applicable temperature
Max. 1.0MPa
Applicable pressure
Amount of air vacuuming
(Standard state)
17m /h and more at - 1.5kPa
3
Valve body pressure test
Hydraulic 1.75MPa
Inlet:Screwed JIS R ¾ " , Outlet:Screwed JIS R ½ "
End connection
Materials
Body(Cast bronze), Disc(Synthetic rubber)
POINTS OF INSTALLATION AND OPERATION
The installation position should be at least
150mm above the overflow edge or overflow
surface of water receiving container.
To ensure safer water supply, install check
valve at the water supply pipe side.
Keep the product vertical to pipe, with deviation of verticality less than 5°.
Carry out sufficient flushing of pipe before installation.
In the case of indoor piping, install indirect draining hardware and lead it to draining tank to
drain water that may leak from the opening of
connecting drain pipe.
In addition, the piping from the opening of connecting drain pipe should not run upwardly
and be supported or fixed properly.
Consider thermal insulation if there is risk of
freezing.
Otherwise,do not block vacuuming hole
by thermal insulation.
Install stop valve (sluice valve/full bore ball
valve) in water supply pipe to make maintenance easier.
Do not connect directly to stop valve or joint
which embedded pipe end core.
CONSTRUCTION
<5°
No uprising
Vacuum breaker
>50mm
Stop valve
[Overflow edge]
[Overflow surface]
150㎜
Indirect draining hardware
To waterspout
Water supply
Check valve
Also install check valve if the diameter of
water supply pipe is larger than 32mm.
EXAMPLES OF APPLICATION
Air conditioning equipment
Cooling tower
For water tanks, liquid tanks etc.
Kitchen utensils
Dish washer
For bottler washer, rice washer etc.
Cleaning machines
Washing machine
For cleaning machines
Others
Sprinkler pipe
For pool, medical/research equipments etc.