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5.2 Precaution for installation
1.
Since the products of the nominal size 125A and 150A are heavy, securely support them using lifting
devices or the like when installing. See the product weight specified in "3. Dimensions and Weights."
* Failure to follow this notice may cause a falling accident of the product, resulting in an injury.
2.
When installing a safety relief valve for equipment protection at the outlet side of the product, connect
a blow-off pipe to the outlet side of the safety relief valve, and lead it to a place where there is no risk of
physical damage even if fluid blows out.
* Failure to follow this notice may result in injury and scalds in the event that high temperature fluid
blows out.
1.
Do not disassemble the product unless it is necessary.
* Unnecessary disassembly prevents the product from functioning properly.
2.
Before installing the product in the piping, be sure to remove foreign substances and scale from the
piping. Keep foreign substances from entering the piping, including seal tape or liquid seal agent for
piping connection.
*Ingress of foreign substances, scale or seal agent into the product leads to valve leakage or
malfunction of the product.
3.
If components having negative influence on internal parts are included in fluid or surroundings,
deterioration of rubber parts is accelerated and then outside leakage or functional disorder is caused.
4. Be sure to install a strainer at the inlet side of the product of nominal size 65A to 150A.
*Ingress of foreign substances or scale into the product leads to malfunction of the product. It is
recommended to use a strainer of 60 mesh or more.
5.
Install a safety relief valve for equipment protection at the outlet side of the product.
* Failure to follow this notice may result in damage of the equipment.
6. Be sure to install pressure gauges at the inlet and outlet sides of the product.
* Failure to follow this notice hampers correct pressure adjustment.
7.
If a quick operating valve such as a solenoid valve is installed, place it at a distance of at least 3
meters from the product.
* Failure to follow this notice may result in malfunction or a drastically shortened service life of the
product.
8.
Install the product properly by checking the inlet, outlet and proper posture. The product can be
installed either horizontally or vertically (nominal size 15A to 100A). In the case of the nominal size
125A and 150A, install the product horizontally.
* Installing the product in wrong directions prevents the product from functioning properly.
9.
Install pipes so that excessive load, torque or vibration is not applied to the product.
10. It is recommended to use a bronze or stainless steel nipple for the outlet side of the GD-26-NE or
GD-28-NE when installing.
* If a steel pipe (lined steel pipe) is used for the outlet side of the product, corrosion (rust tubercle, etc)
at the end of the steel pipe is increased year by year, which clogs the reduced pressure detection hole
at the outlet side of the product and result in insufficient fluid flow.
11. The product can be installed either horizontally or vertically (nominal size 15A to 100A). In case of nominal
size 125A and 150A, install the product horizontally.
12. A space more than the value shown as H
A space more than the value shown as H
strainer (nominal size 15A to 50A).
13. For two-stage pressure reduction, keep a distance of at least 3 meters between each product.
*Failure to follow this notice may prevent the product from functioning properly due to malfunction.
Model GD-26-NE, GD-27-NE, GD-28-NE, GD-29-NE, GD-27-N, GD-27F-N, GD-26L-NE
Nominal size
H
2
H
3
2
3
15A
20A
25A
32A
240
240
250
300
80
80
90
120
Warning
Caution
in the table below is required for disassembly and inspection.
in the table below is required for the inspection of the built-in
40A
50A
65A
300
320
450
120
150
11
80A
100A
125A
450
550
970
-
-
-
(mm)
150A
970
-
-
PDT-008o
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