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EPDT-023c
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Caution
(1) Before leading fluid into the product, close the stop valves at the inlet and outlet of the
product and remove foreign substances and scale from the piping completely by using a
bypass line.
* Failure to follow this notice may prevent the product from functioning properly due to the
ingress of foreign substances and scale into the product.
(2) To adjust the set pressure, turn the adjusting screw slowly.
* Failure to follow this notice may result in damage to the product and other equipment
due to hunting or other cause.
(3) If closing outlet side of the product and keeping fluid inside the product for an extended
period, sliding parts become stuck and it causes malfunction of the product.
*Check if the product operates normally when resuming the product.
(4)
If there is a possibility of freezing or the product is not used for an extended period,
completely discharge fluid from the product and pipes, and close the stop valves at the
inlet and outlet sides of the product.
* Failure to follow this notice causes malfunction of the product due to rusting inside the
product and the pipes or damaged by freezing.
(5) If the systems have been out of service for a long time, please perform the following
operational checks before restarting the systems.
・
Check if the set pressure changes when turning the adjustment screw (see Fig. 13).
・
Check whether the primary pressure is stable at the adjusted pressure.
* If there is any abnormality, please ask a professional to take measures.
(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. It is fully opened at
the time of shipment.
(7)
The set pressure may be affected by ambient temperature (external temperature) and
fluid temperature. Install pipes so that the product may not be exposed to direct sunlight.
(8)
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.
6.2 Adjustment Procedure
(1) Close the stop valves at both sides of the valve, and thoroughly purge the system through
the by-pass line. When completed, be sure to close the by-pass valve.
(2) Loosen the lock nut [16] (see Table 11).
(3) Slowly open the inlet stop valve, then fully open the outlet stop valve, allowing a trickle to
be discharged.
(4) Slowly turn the adjusting screw [15] (clockwise to increase, counterclockwise to reduce)
while observing the pressure gauge on the inlet side (see Fig. 13).
(5) After the adjustment, tighten the lock nut [16].
Fig. 13
Table 11
(mm)
Size
15-50A
65-100A
125-150A
Width across flats
27
36
55
Adjusting screw
⑮
Lock nut
⑯
Reduce
Increase
