10．Operation; Precaution For Operation; Precaution And Procedure For Pressure Adjustment - Yoshitake GD-46 Series Instruction Manual

１ ０．Operation
１ ０ ． １ Precaution for operation

WARNING
Never directly touch the product with bare hands when hot fluid is running.
※Hot fluid may cause burns.
 CAUTION
(１）Do not disassemble the product unnecessarily. The product is adjusted to the standard set
pressure at factory before shipment. In the case the adjustment is required, it must be done by
an experienced professional and the set pressure must be within the range specified on the
label attached to the product. Refer to "10.2 Precaution and procedure for pressure adjustment
".
(２)Confirm that the flat surface of the cap is facing up.※The product does not work as a
pressure reducing valve with the concave face of the cap upward.
The concave face has an O-ring on its circumference.
The set pressure may change according to ambient temperature or fluid temperature.
Avoid exposing the product and the piping to the direct sunshine.
１ ０． ２

Precaution and procedure for pressure adjustment

Pressure gauge
(１ ) Wrap seal tape around the male thread (R 1/8) of the pressure gauge, and screw it into the
pressure gauge joint. (Fig.3)
(２ ) Remove the cap. By checking the pressure gauge, turn the adjusting screw to adjust the reduced
pressure to a desired level. (Fig.4)
・ The reduced pressure increases when the adjusting screw is turned clockwise.
・The reduced pressure decreases when the adjusting screw is turned counterclockwise.
Note: Use a keystone tip screwdriver of 4.5 to 6 mm in nominal width for slotted head screws. Set
the screwdriver in the slot of the adjusting screw avoiding the domed cap nut attached in the
center of the screw, and adjust the reduced pressure. If pressure adjustment is difficult to
make, please contact us.
(３ ) After reduced pressure adjustment, attach the cap with the flat face up.
 CAUTION
(４ ) Connect the pressure gauge on the spot.
Be sure to detach the pressure gauge after making adjustment and checking the pressure.
※If the pressure reducing valve is used with the pressure gauge attached, the pressure gauge
joint may be damaged (stress corrosion cracking) depending on the usage environment,
causing outside leakage. If the reducing valve needs to operate with a pressure gauge
connected, screw the gauge directly into the valve body and do not use a pressure gauge
joint.
Pressure gauge Joint
Fig.3
－11－
Fig.4
■EPDT-166f■