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EPDT-023c
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7.2 Precautions for Maintenance
Warning
(1) The valve shall be disassembled and inspected by qualified persons.
(2) Completely discharge internal pressure from the valves, lines, and equipment, and
cool the valve down to a level where you can touch it with bare hands before
disassembly and inspection.
* Failure to do so may result in injury or burns due to residual pressure or spillage
around the valve.
Caution
(1) Perform periodical inspection to maintain product functions and performance.
* General users shall request countermeasures to installers or maintenance
companies.
(2) Rubber parts and components shown below are consumables. Note that the life
expectancy depends on the conditions under which they are used.
Table 12
Recommended
replacement period
Parts name
3 years
Valve, O ring, Diaphragm
7.3 Periodic Inspection
Conduct daily and periodic inspections in order to maintain the optimal performance of the
product. See ”7.1 Troubleshooting” for the remedies if trouble is observed.
● Daily inspection (once a day)
Items
Standards for Inspection
Inlet pressure
There should be maintained at the set pressure.
Outside leakage
There should be no outside leakage.
Abnormal noise
There should be no abnormal noise
● Periodic inspection (once a year)
Items
Standards for Inspection
Valve and valve seat
There should be no scratches, wear, or foreign matters
caught on the seat surface.
Retainer sliding part
There should be no scratches, or foreign matters caught
on the surface of the part.
O ring
There should be no damage on the O-ring.
7.4 Disassembly
(1) Release the internal pressure completely, and make sure of zero pressure.
(2) Slightly loosen the lock nut [16] and turn the adjusting screw [15] counter clockwise to relieve
the adjusting spring [14] (Unload the spring).
(3) Remove the hexagon bolt [29] from the spring chamber [2], then remove the spring chamber,
and take out the adjusting spring [14] and the spring plate [13].
(4) To remove the diaphragm [11], fix the spindle [6] and remove the U nut [17].
(5) To remove the retainer [4], loosen and remove the retainer guide [5] clamping bolt [28] and
pull the retainer guide [5]. Remove it by the bellow method (Fig.14, Fig.15) when it is difficult
to remove the retainer guide [5].
(6) To remove the valve seat [8], pull the spindle [6].
(7) Fix two planar sections at spindle [6] and loosen U nut [19] for spindle [6] to remove it, then
the valve [9] can be dismounted.
