65
Item
No
Selection Principle
4
Butterfly valves for the inlet or return water tubes.
5
Butterfly valves for the horizontal main tubes.
6
Gate valves, filters, electric 2-way valves or electric 3-way valves for the air
handling units.
7
Gate valves (or with electric 2-way valve) for the fan coil units.
For butterfly valves, the one which diameter less than 150mm is the hand-wheel type; the one
which diameter is large than 150mm is the worm-gear drive type.
Precautions
1
The reducing valves and balance valves should work together with by-pass
valves.
2
Ball valves and gate valves are the best choice for the full-open and full-close
type valves.
3 The shut-off valves should be avoided to the most extent.
4
Pay much attention to the calculation of the resistance of the valves.
5
Choose the proper electric valves.
Valves for
Water
Supply
Pipes
1
Regulating and shut-off valve are good choices when the water flow and
pressure should be regulated.
2
Gate valves are good choices when the water resistance is required to be
small.
3
Butterfly and ball valves are good choices when the installation space is
small.
4 Shut-off valves should be used when fluid flows in two directions.
5
Multi-function valves are good choices for the water pump with large diameter.
Setup Location of Check Valves
Setup
Location
1
At Influent pipes
2
At the inlet pipe of the closed water heater or water treatment equipment.
3
At the outlet pipe of the water pump.
4
At the outlet pipe used also as the inlet pipe of the water tank, water tower and
high-level water pool.
Note: the check valve is not required for the pipe with the backflow preventer
Type
Selection of
Check
Valves
It depends on the installation location, upstream water pressure, sealing
performance and size of the water hammer etc.
1
Swing, ball and shuttle-type check valves are good choices when pressure
upstream is small.
A Series Modular-type Air-cooled (Heat Pump) Chiller
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