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EPDT-209
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6. Installation
6.1 Piping Example
6.2 Warning and precaution on installation
Warning
In case installing safety relief valve as safety device at outlet side, joint relief pipe at outlet of
safety relief valve and guide it to safety place where steam can relief out.
Caution
( 1 ) Do not disassemble the valve unreasonably.
*Disassembling the valve at your discretion may affect the original performance.
( 2 ) Remove foreign matter and scales from the lines before installing the valve.
*Failure to do so may prevent the valve from functioning correctly.
( 3 ) Install a strainer (Screen: 60 mesh) at the valve inlet side.
*Failure to do so may hamper correct pressure control, which affects the original
performance.
( 4 ) Install a safety relief valve at the valve outlet side for protection of equipments.
*Failure to do so prevents problem detection, resulting in equipment damage.
( 5 ) Install a pressure gauge at both the inlet and outlet sides of the valve.
*Failure to do so may hamper correct pressure adjustment.
( 6 ) When installing quick open and close valves, such as a solenoid valve, secure at least 3 m
from the valve.
*Failure to do so may result in malfunction or drastically shortened service life.
( 7 ) 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.
( 8 ) Install the valve in proper direction of the fluid flow.
*Failure to do so affect the performance.
( 9 ) Do not apply excessive load, torque or vibration to the valve.
*Doing so may result in malfunction or drastically shortened service life.
(10) Secure the necessary maintenance space at the installation site of the pressure reducing
valve.
*In case there is not enough space for maintenance, pressure reducing valve cannot be
disassembled at the time of maintenance.
(11) The set pressure of safety relief valve must be higher than the set pressure of pressure
reducing valve.
*In case reseating pressure of safety relief valve is lower than the set pressure of
pressure reducing valve, safety relief valve will continue to blow.
(12) Do not freeze pressure reducing valve.
*Freezing may damage pressure reducing valve.
(13) Do not allow pipe adhesive materials to leak into pressure reducing valve.
*In case the adhesive material is acquired in pressure reducing valve, it causes
malfunction.
