9
5. Maintenance Space
200
(
8)
200
(
8)
200 (8) 200 (8)
Leave sufficient space for maintenance, inspection
and repair.
Unit: mm (in)
6. Piping Size
Straight piping: 10 d or longer upstream,
15 d or longer downstream
Diffuser
Pressure
Reducing
Valve
Straight piping: 10 d or longer upstream,
15 d or longer downstream
Diffuser
Pressure
Reducing
Valve
Pressure
Reducing
Valve
Pressure
Reducing
Valve
Pressure
Reducing
Valve
If it is expected that the
secondary flow velocity will
be more than 30m/s (100
ft/s), install a diffuser in
order to keep the flow
velocity below 30m/s(100
ft/s). If the distance
between the reducing valve
and the equipment is great,
a possible drop in pressure
should be taken into
consideration when
selecting the piping size.
If installing a strainer,
horizontal installation is
recommended in order to
prevent pooling of
condensate.
7. Two-stage Pressure Reduction
Pressure
Gauge
Bypass Valve
Inlet
Valve
Outlet
Valve
Safety Valve
(Relief Valve)
Primary
Side
Pressure
Reducing
Valve
Bypass Valve
Secondary
Side
Inlet
Valve
Outlet
Valve
Pressure
Reducing
Valve
Pressure
Gauge
Pressure
Gauge
Bypass Valve
Inlet
Valve
Outlet
Valve
Safety Valve
(Relief Valve)
Primary
Side
Pressure
Reducing
Valve
Bypass Valve
Secondary
Side
Inlet
Valve
Outlet
Valve
Pressure
Reducing
Valve
Pressure
Gauge
Pressure
Gauge
Inlet
Valve
Outlet
Valve
Safety Valve
(Relief Valve)
Primary
Side
Pressure
Reducing
Valve
Bypass Valve
Secondary
Side
Pressure
Gauge
Pressure
Gauge
Inlet
Valve
Outlet
Valve
Safety Valve
(Relief Valve)
Primary
Side
Pressure
Reducing
Valve
Bypass Valve
Secondary
Side
Pressure
Gauge
Employ 2-stage pressure
reduction if the required
reduction is not possible due to
PN-DR operating range
limitations
(when it is not possible to reduce
to the desired pressure using a
single pressure reducing valve).
Inlet
Valve
Outlet
Valve
172-65119MA-01 (PN-DR) 13 Jun 2013
