Precaution And Procedure For Water Pressure Inspection - Yoshitake GD-46 Series Instruction Manual

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Precaution and procedure for water pressure inspection

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CAUTION
(1) Wear protective gloves e.g. cotton work gloves when removing/installing the cap (17).
※Hand protection is required.
(2) If perform pneumatic inspection with the concave position upward (Fig.1), do not sprinkle
forming liquid to the O-ring (18).
※The O-ring (18) swells with water. If the foaming liquid contacts it, it seals the gap and
causes airtightness inside the spring cover, resulting in malfunction.
(１ ) Be sure to check that there is no internal pressure in the piping before water pressure inspection.
If internal pressure remains inside, remove it.
(２ ) Remove the cap and turn it out (make concave portion upward), and screw it firmly onto the spring
cover. (Fig.1)
※Do not screw the cap when there is internal pressure.
(３) On water pressure inspection, be sure to check the concave portion of the cap is screwed in
upward direction, and conduct the water pressure inspection at 1.75 MPa or less.
(４) Take the internal pressure, and be sure to return the cap to the original position (making planar
position upward) after water pressure inspection.(Fig.2)
※If the cap does not return to its original position, the product cannot functions as a
pressure reducing valve.
Fig.1. Fig.2.
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■EPDT-166f■