Periodic Replacement Of Parts; Troubleshooting - Yoshitake DP-100 Series Product Manual

8.2 Periodic replacement of parts

Caution

8.3 Troubleshooting

Trouble
The valve does not
open.
(Fluid does not flow.)
The valve does not
close.
(Fluid flow does not
stop.)
The product
vibrates.
Replace the following parts when the time below comes in order to maintain the
optimal performance of the product.
Part replacement
Part
Piston ring*
Inner ring*
Per the earlier of 500,000
actuations or 2 years
Valve*
Plunger*
Coil Per 4 years
* These parts are replaced together as a valve complete set.
* Replace the cover gasket at the same time.
Cause
1. Strainer installed at the inlet side
of the product is clogged.
2. Plunger a'ssy is stuck with
foreign substances in the piping.
3. Pilot valve seat portion gets
stuck with foreign substances
4. Fluid pressure exceeds the
specified working pressure.
5. Fluid viscosity exceeds 20 cSt.
For Model DP-100, DP-100F, DP-100-D or DP-100F-D, see *1.
For Model DP-100-C or DP-100F-C, see *2
1. Plunger a'ssy or valve seat is
stuck with foreign substances or
get damaged.
2. Plunger a'ssy is stuck with
foreign substances in the piping.
3. Inlet/outlet of the product is
installed in the opposite direction
of the fluid flow.
4. Bypass stop valve is kept open.
5. The differential pressure is less
than 0.03 MPa when the coil is
set sideways.
For Model DP-100, DP-100F, DP-100-D or DP-100F-D, see *2.
For Model DP-100-C or DP-100F-C, see *1.
1. There is a constricted part of
piping just in front of the inlet of
the product.
2. Gas is commingled in the liquid.
(When the applied fluid is liquid.)
Time for replacement
1. Clean the strainer.
2. Disassemble the product and remove
3. Replace the valve complete set.
4. Adjust the fluid pressure to the
5. Adjust the fluid viscosity to the
1. Disassemble the product and remove
2. Disassemble the product and remove
3. Reinstall the product correctly.
4. Close the bypass stop valve.
5. Adjust the differential pressure to be 0.03
1. See 22 and 23 in "Caution" for
2. Avoid commingling of gas.
15
Remedy
foreign substances. Make sure that the
sliding action is smooth.
appropriate level.
appropriate level.
foreign substances.
Replace the valve complete set with a
new one if any damage is observed.
foreign substances. Make sure that the
sliding action is smooth.
MPa or more. If the minimum differential
pressure is not obtained, install the
product to a horizontal piping with the coil
faced upward.
"6. Installation" on page 9.
■EPDT-247i■