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Model GD-28S-NE, GD-29S-NE
Nominal size
5.1 Precaution for operation
Warning
1.
Before leading fluid into the product, close the stop valves on the inlet and outlet sides of the product
and remove foreign substances and scales 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 scales 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 causes. See 5.2 Adjusting procedure.
3. If outlet side of the product is closed while fluid is kept 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.
When the product is not used for an extended period, completely discharge fluid from the product and
pipes, and close the stop valves on 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.
5.
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.
5.2 Adjusting procedure
Following a wrong adjusting procedure may cause hunting, scale problems or other problems, and can
heavily damage the main parts of the valve. To avoid these problems, be sure to follow the procedure given
below.
1.
Close the stop valves on the inlet and outlet sides of the product, and take adequate time to blow out
fluid by using a bypass line. In doing this, adjust the opening of the globe valve in the by-pass pipe
so that the safety relief valve will not blow out. After finishing blowing, close the globe valve without
fail.
2.
After slowly fully opening the stop valve on the inlet side, open the stop valve on the outlet side slightly
so that fluid flows through slightly.
20A
25A
H
250
250
2
H
90
90
3
5. Operation procedure
When the product is used for hot fluid, do not touch the product with bare hands.
* The product having hot fluid may scald your skin.
32A
40A
50A
300
300
320
120
120
150
Caution
9
(mm)
65A
80A
100A
450
450
550
-
-
-
EPDT-351
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