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7.2 Precaution for maintenance and inspection
1.
Completely discharge the pressure inside of the product, piping and equipment before disassembly and
inspection. Disassembly and inspection must be done by experienced professional or valve
manufacturer.
* Failure to follow this notice may result in scalds, injury or contamination on the surroundings due to the
residual pressure.
2.
If fluid is hot, do not touch the product directly with bare hands.
* Failure to follow this notice may result in scalds or injury.
1.
If problem occurs for a cause other than listed in "7.1 Troubleshooting" on Page 13, please contact us.
2.
When the product is disassembled, internal fluid flows out. Receive it in a container.
* Failure to follow this notice may result in making the surroundings dirty.
3.
Synthetic rubber is a consumable part. The replacement interval of the synthetic rubber part greatly
varies depending on the use conditions. The general guide for the replacement interval is shown below.
Service life
Three years
Five years
7.3 Disassembly
1.
Remove the domed cap nut [17] (loosen the nut [41] in the case of nominal size 125A and 150A),
turn the adjusting screw [14] counterclockwise, and set the spring [15] free (no load).
2.
Remove the bolts [18] of the spring chamber [2] and remove the spring chamber [2]. Then take out
the spring [15] and the spring plate [13].
3.
Remove the nut [22], and then the diaphragm retainer [12], and diaphragm [9].
4.
Remove the set screws [25] (bolts [25] in the case of nominal size 65A to 150A) of the valve seat [3],
and remove a set of the valve seat (valve seat [3], spindle [4], disc [8], and O-ring [28]).
Nominal size 15A to 50A: Attach the diaphragm retainer [12] to the spindle [4], and pull it up.
Warning
Caution
Part name
Diaphragm [9], O-ring [6], Disc [8]
O-ring [20], [24], [26], [28], [30], [45]seal washer [42]
14
PDT-008o
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