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8.2 Precaution for maintenance and inspection
(See "4. Structure" on Page 6 and "9. Exploded view" on Page 16.)
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. When disassembling the product at by-pass function or stop function is necessary, make sure not to
switch functions during disassembly.
* Failure to follow this notice may result in injury or contamination on the surroundings due to fluid
blowout.
3. If fluid is hot, do not touch the product directly with bare hands.
* Failure to follow this notice may result in scalds.
1. If problem occurs for a cause other than listed in "8.1 Troubleshooting" on Page 11, 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
3 years
5 years
4. Ball valve part cannot be disassembled.
8.3 Disassembly
(See "9. Exploded view" on Page 16)
1.
Remove domed cap nut [40] and turn adjusting screw [32] counterclockwise, and set spring [35] free
(no load).
2.
Remove bolts [38] of spring chamber [2] and remove spring chamber [2]. Then take out spring [35]
and spring plate [31].
3.
Remove nut [36], and then diaphragm shell [30] and diaphragm [16].
4.
Remove set screw [15] (bolts [15] in the case of nominal size 65A to 100A) of valve seat [3], and
remove a set of the valve seat (valve seat [3], spindle [6], disc [12], and retainer [7], etc).
Nominal size 20A to 50A: Attach diaphragm shell [30] to spindle [6], and pull them up together.
Warning
Caution
Part name
Diaphragm [16], O-ring [8], Disc [12]
O-rings (except for [8])
12
EPDT-278
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