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7. Maintenance Procedure
Be aware of foreign materials because many of faults on pressure reducing valve are due to the
existence of foreign materials. Please be reminded that our warranty does not cover damages
caused by foreign materials at the customer site. Failure resulting from faulty pressure gauge,
clogged strainer and leakage from by-pass stop valve are phenomena kindred to failure of pressure
reducing valve. Clogged strainer will decrease the secondary pressure and leakage from by-pass
pipe will increase the secondary pressure. Before do the troubleshooting of pressure reducing valve,
check such symptom of the strainer and stop valve.
7.1 Warning and precaution on maintenance and inspection
Warning
The pressure reducing valve shall be disassembled and inspected by qualified persons.
( 1 ) 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 ) To maintain the functions and performance of pressure reducing valve, perform
periodical inspection.
*User should request to specialized dealer or manufacturer for such tasks.
( 2 ) Pressure reducing valve should be disassembled and inspected by qualified person or
manufacturer.
*Request the treatment to specialized dealer or manufacturer in case of any problems.
( 3 ) During disassembling, internal fluid flows out. Discharge it into a suitable container.
Disassembling pressure reducing valve after all fluids have been discharged.
*Fluid spills will contaminate surroundings.
( 4 ) Close the stop valves before and after pressure reducing valve, and remove all foreign
matter and scales via the by-pass line before operation.
*Failure to do so may cause the malfunction of pressure reducing valve.
･Consumable parts and replacement period
Service life of consumable parts is dependent on the frequency and condition of usage. Rough
indication of service life is given below.
(Refer to the parts number in "2.2 Construction")
Name of parts
Diaphragm
O-ring
No.
Replacement period
(8)
3 years
(15)・(23)
3 years
-9-
■ EPDT-175d■
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