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5.3 Piping before and after the pressure reducing valve
Warning
(1) 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.
Caution
(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. 5 when piping.
Nominal
size
GPK-2001
15A
20A
240
25A
32A
250
40A
50A
290
65A
310
80A
320
100A
350
Fig.5
-12-
A
B
GPK-2003
340
260
350
270
380
310
430
330
370
340
390
370
470
■EPDT-098a■
(mm)
C
180
200
220
260
280
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