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７．２ Adjustment Procedure
Caution
(１) Follow the steps below, and slowly turn the adjusting screw to set
pressure. Incorrect adjustment may cause hunting, water hammer, etc.,
resulting in damage to the valve and other equipment.
(１) Close the stop valves at both sides of the pressure reducing valve, and
thoroughly purge the system through the by-pass line, with the by-pass valve
opening adjusted so that the safety relief valve is not activated. When
completed, be sure to close the by-pass valve.
(２) Slowly open the inlet stop valve, then open the outlet stop valve slightly,
allowing a trickle to be discharged.
(３) Loosen the lock nut⑭, and slowly turn the adjusting screw⑬ (clockwise to
increase, counterclockwise to reduce) while observing the pressure gauge on
the outlet side.
(４) Slowly open the outlet stop valve to its full-open position.
(５) After the adjustment, tighten the lock nut⑭.
(６) In case of secondary pressure for size 65A to 150A is unstable because of an
air obstruction or etc., adjust opening of needle valve at detecting pipe.
Adjusting screw⑬
Lock nut⑭
Reduced pressure goes up．
Fig.12
-11-
Reduced pressure goes down．
■EPDT-096b■
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