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5.3 Piping before and after the pressure reducing valve
1. Be sure to install a non-return valve in the air line system.
* Failure to do so could pose a risk of burns caused by steam flowing back through the air line in the
event of the main diaphragm rupture.
2. When installing a safety valve for equipment protection at the outlet side of the product, connect a
blow-off pipe to the outlet side of the safety valve, and lead it to a place where there is no risk of
physical damage even if fluid blows out.
* Failure to follow this notice may result in injury and scalds in case of fluid blow out.
1. Install a strainer (80 mesh) at the pressure reducing valve inlet side. Also, match the nominal diameter
of the strainer to the diameter of the piping on the inlet side of the pressure reducing valve.
* Failure to do so may hamper correct pressure control, which affects the original performance.
2. Install a safety valve for equipment protection at the outlet side of the product.
* Failure to follow this notice may prevent the product from achieving its intended performance due
to the ingress of foreign substances and scale into the product.
3. Install a pressure gauge at both the inlet and outlet sides of the valve.
* Failure to do so may hamper correct pressure adjustment.
4. Install a steam trap to the inlet sides of the valve to prevent drainage problems.
* Failure to do so may result in drainage problem, affecting the original performance.
5. When installing quick open and close valves, such as a solenoid valve, install it at inlet side as much
as possible, and secure at least 3 m from the valve.
* Failure to do so may result in malfunction or drastically shortened service life.
6. When pressure reducing in two stages, secure at least 3 m between the valves.
* Failure to do so may result in malfunction, affecting the original performance.
7. When the pressure reducing ratio is large, install a reducer to keep the flow velocity in the pipe below
30 m/s or less.
* An excessively high flow velocity may cause erosion, resulting in drastically shortened service.
8. Install a bypass pipe around the pressure reducing valve. (Refer to 5.4 Piping example)
* Without a bypass pipe, it would be necessary to stop operation during maintenance and inspection.
9. Space is required above and below the center of the piping and on the conduit side for overhaul
inspection, so secure the space shown in Fig. 6 when piping.
Warning
Caution
Nominal
Fig.6
11
(mm)
A
size
15A
230
20A
160
25A
240
32A
185
255
40A
50A
210
280
65A
275
325
80A
300
340
100A
380
400
B
EPDT-021a
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