172-65175MA-13 (COS Pressure Reducing Valve) 16 Feb 2022
12
Install the COS, paying attention to avoid
excessive load, bending and vibration.
Support the inlet and outlet pipes
securely.
6. Maintenance Space
Leave sufficient space for maintenance, inspection
and repair.
(Unit: mm (in))
7. Trap Outlet Pipe
For ease of maintenance, installation of a union connection is recommended
for the trap outlet pipe.
Connect the outlet pipe to a condensate
return line, or extend it to a trench. In the
case of the latter, make sure the end of the
pipe is above the waterline. (Dirt and water
may be sucked up by the vacuum formed
during trap closure and system shutdown.)
8. Blowdown Valve (requires optional plug)
In an environment of heavy dirt or scale, or when the steam-using equipment is used
only periodically, such as for room heating equipment, be sure to use a blowdown
valve.
1) Remove the plug from the main body.
2) Install the blowdown valve.
3) Open the blowdown valve and blow any residual dirt
and scale off of the screen.
4) Periodically activate the blowdown valve to keep the
system free of dirt and scale.
9. Piping Size
If it is expected that the secondary steam flow velocity will be more than 30 m/s
(100 ft/s), install a diffuser in order to keep the flow velocity below 30 m/s (100
ft/s). If the distance between the reducing valve and the steam-using equipment
is great, a possible drop in pressure should be taken into consideration when
selecting the piping size.
In addition, when installing the strainer, the strainer screen should be either at
the 3 o
’clock or 9 o’clock position to prevent condensate accumulation.
100
(4)
100
(4)
100
(4)
400
(16)
300
(12)
100
(4)
400
(16)
Small Hole
Remove the
3
/
8
in
plug (optional)
and install the
blowdown valve
Straight-run Piping Lengths (d = pipe diameter) :
Upstream = 10 d or more; Downstream = 15 d or more
Diffuser
COS
Diffuser
COS
COS
COS
