Water pipe
installation
Service Manual
38
Water check valve
SMGB0066 rev.0 - 12/2009
The following table shows the reference values fo the most important parameters concerning the quality of the water:
Item
Water System
Tendency
Circulating Water
(20 C less than)
Supply Water
Corrosion
deposits of scales
Standard quality pH (25 °C)
6.8 ~ 8.0
6.8 ~ 8.0
Electrical conductivity (mS/m) (25°C)
{µS/cm} (25 °C) (2)
Less than 40
Less than 400
Less than 30
Less than 300
Chlorine Ion (mg CI¯/I)
Less than 50
Less than 50
Sulphur acid Ion (mg SO42¯/I)
Less than 50
Less than 50
The amount of acid consumption (pH 4.8)
(mg CaCO3/I)
Less than 50
Less than 50
Total hardness (mg CaCO3 /I)
Less than 70
Less than 70
Calcium hardness (mg CaCO3 /I)
Less than 50
Less than 50
Silica L (mg SIO2 /I)
Less than 30
Less than 30
Reference quality
total iron (mg Fe/I)
Less than 1.0
Less than 0.3
Total copper (mg Cu/I)
Less than 1.0
Less than 0.1
Sulphur ion (mg S2¯/I)
It shall not be detected.
Ammonium ion (mg NH4+/I)
Less than 1.0
Less than 0.1
Remaining chlorine (mg CI/I)
Less than 0.3
Less than 0.3
Floating carbonic acid (mg CO2/I)
Less than 4.0
Less than 4.0
Index of stability
6.8 ~ 8.0
-
note
The mark “
-
” in the table means the factor concerned with the tendency of corrosion or deposits of scales.
The value showed in “{}" are for reference only according to the former unit.
-
As the the well water should not fulfil the above limits, the use of industrial water or other water sources should
-
be considered.
2.4. WATEr CHECK VAlVE
Attached to the unit there is a water check valve (non return valve). This component is a safety device to protect the system
against back pressure, back flow and back syphonage of non-potable water into service pipe, plants and equipments.
This valve shall be installed at site.
Main Characteristics:
Maximum working pressure: 16bar
Maximum working temperature: 70ºC (short term 90ºC)
Threaded connection R1/2”
Available test and drain plugs 1/4”
Length: 137mm
Kvs value: 6
Weight: 0.24kg
