14
8. Piping Size / Diffuser
172-65185A-08 (MC-COSR Multi-control Valve) 20 Nov 2014
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 multi-control valve and the
steam equipment is great, a
possible drop in pressure
should be taken into
consideration when selecting
the piping size.
直管部は上流側 10d 以上、下流側 15d 以上 （d：呼径）
ディフューザ
Diffuser
M C -C O SR
M C -C O S R
Upstream Downstream (d = pipe diameter)
=10 d or more =15 d or more
Straight-run
Piping Lengths:
9.
Two-stage Pressure Reduction
Install a pressure reducing valve at the inlet side of MC-COSR whenever the
pressure cannot be reduced to the desired level with a single multi-control valve
due to operating range limitations, such as when the reduction ratio is greater
than 10:1.
M C -C O S R
計
計
パス弁
弁
出口弁
口弁
弁（レリーフ弁）
入口
出
安全
圧力
圧力
バイ
一次側
二次側
バイパス弁
入口弁
減圧弁
一次側
圧力計
圧力計
入口弁
出口弁
安全弁（レリーフ弁）
二次側
バイパス弁
M C -C O S R
10. Accessories
Always install a shut-off valve, pressure gauge and bypass lines at both inlet and
outlet. Ball valves, which will not retain condensate, are recommended for inlet
and outlet shut-off valves. The bypass pipe should be at least ½ of the size of the
inlet (primary side) pipe. If installing a strainer before the multi-control valve,
horizontal installation with the basket in the same horizontal plane to the piping is
recommended in order to prevent condensate pooling.
ボールバルブ
ボールバルブ
玉形弁
M C -C O S R
M C -C O SR
Pressure
Gauge
Bypass Valve
Inle
de
t Si
Ou
Side
tlet
Shutoff
Valve
Shutoff
Valve
P
ure Gau
ress
ge
Safety Valve (Relief Valve)
Pressure
Gauge
Bypass Valve
Inlet Side
Outlet Side
Shutoff
Valve
Shutoff
Valve
Pressure Gauge
Safety Valve (Relief Valve)
Shutoff
Bypass Valve
Valve
Shutoff
Valve
Pressure
Reducing
Valve
Glove Valve
Ball Valve
Ball Valve
