Tomoe 304YA, Instruction Manual

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12
Check for
any leak
[Fig.-12]
3. 5 Precautions for Safe Handling After Installation
CAUTION
3. 5. 1 Precautions for safe handling after installation
After this product is connected to the piping, perform
checks while paying attention to the following points. If the
checks are not performed, serious accidents may occur,
such as damage of the product.
1) Prior to operating, clean pipes and remove foreign
material from the inside and outside of the pipes.
2) Prior to operating, increase the internal pressure of
the piping and check for leakage from the flanges,
glands, and bottom. Make sure that the internal
pressure does not exceed the rated pressure of the
valve at the leakage check.
3) If leakage from the flanges is observed, reduce the pressure and then retighten the piping
bolts and nuts.
Refer to “
Piping bolt tightening procedures” in section 4. 1. 1 10) for the tightening proce-
dures. If leakage from the bottom is observed, check for looseness of the hexagon bolts at the
bottom. If leakage from the glands is observed, retighten the hexagon bolts of the glands. If
leakage does not stop, release the piping internal pressure and remove this product from the
piping. Then replace the glands or spare parts at the bottom.
4) When performing a pressure test of the piping including this product, the pressure should be
the rated pressure of this product × 1.5 times or less.
When performing a pressure test of the piping where the pressure exceeds the rated pressure,
set the product to the full-open positon.
5) After installation, open and close the product about once every two weeks if the product is not
used for long periods of time.
6) Do not use this product as a blank flange by setting the product to the full-close position.
WARNING
WARNING
CAUTION
CAUTION
3. 5. 2 Precautions for operating this product
1) Never loosen the bolts, pins or piping bolts of this product when the inside of the piping is un-
der pressure. Otherwise fluid jets to the outside, which is dangerous.
2) Do not remove the actuator from this product when the inside of the piping is under pressure.
Unexpected abrupt valve operation may occur or the shaft may spring out.
3) When this product is used at the intermediate opening, the opening should be 30° or more. If
the product is used continuously with the opening of 30° or less, damage of sheets, or dam-
age, vibration and noise of the piping may occur due to jet speed increase or cavitation. (Refer
to section
3. 1. 4.)
4) Do not loosen the stopper bolts of the actuator and the
indicator installation bolts of the lever. Otherwise, seat
leakage may occur because the full-close position is
shifted. When the stopper bolts are moved, perform
full-close position adjustment again in accordance with
“
Valve Body Full-Close Position Adjustment Proce-
dure” in section 5. 5.
5) For a manual gear type actuator, the stopper works
when the indicator shows full-open or full-close. Do not
apply excessive force to the handle wheel from this
state. Otherwise, the gear box will be damaged.
This product has been adjusted so that the maximum sealing performance can be obtained
at the full-close position adjusted with the stopper bolts. The sealing performance will be dete-
riorated and torque becomes low at a position which is deeper or shallower than the adjusted
position. Therefore, it is not necessary to rotate the handle forcibly.
6) Opening and closing operation of the lever and the handle wheel must be done by hand. When
operating the handle using an ancillary tool, such as a Wilky key, this may cause damage or
failure of the product.
7) After installation and before operation, be sure to open and close the product once or twice.
8) After trial operation or operation over a fixed period, retighten the piping bolts and nuts. Par-
ticularly, in applications involving high-temperature fluids, the tightening force of the bolts may
be reduced due to stress relaxation of the piping gaskets, which may cause flange leakage.
[Fig.-13]
Indicator
Stopper bolt
Hexagon nut