10
8. Pressure Sensor Installation (for
pressure control)
The length of piping between the
PN-COS-16
and the pressure
sensor should be no more than 5 m
(17 ft). If the piping distance is too
great, pressure loss and delay of
pressure change along this distance
will increase, resulting in steam flow
rate fluctuations.
PN-COS
Pressure
Gauge
Pressure
Sensor
>
>
>
>
>
>
>
>
>
>
Straight
pipe
Straight
pipe
15 d or
more
5 d or
more
Distance of
5 m (17 ft) or less
Steam fluctuations at the pressure sensor may impair the stability of the pressure
control. Ensure a straight piping run of at least 15 d upstream and 5 d
downstream from the pressure sensor.
9. Blowdown Valve (requires an 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 (option) 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.
Remove the
10 mm (
3
/
8
in) plug
(optional)
and install the
blowdown valve
10. Piping Size
If the secondary steam flow velocity is expected to 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
PN-COS-16
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.
PN-COS
Diffuser
Straight-run piping lengths (d = pipe diameter):
PN-COS
Diffuser
Straight-run piping lengths (d = pipe diameter):
Upstream = 10 d or more; Downstream = 15 d or more
PN-COS
Diffuser
Straight-run piping lengths (d = pipe diameter):
PN-COS
Diffuser
Straight-run piping lengths (d = pipe diameter):
Upstream = 10 d or more; Downstream = 15 d or more
PN-COS
PN-COS
172-65588MA-02 (
PN-COS
Pneumatic Control Valve) 5 Sep 2014
