172-65200MA-07 (PCV-1) 8 Oct 2021
8
Maintenance
Take measures to prevent people from coming into direct contact with
product outlets. Failure to do so may result in burns or other injury from
the discharge of fluids.
CAUTION
Be sure to use only the recommended components when repairing the
product, and NEVER attempt to modify the product in any way. Failure to
observe these precautions may result in damage to the product or burns
or other injury due to malfunction or the discharge of fluids.
CAUTION
Operational Check
A visual inspection of the following items should be done on a daily basis to
determine whether the product is operating properly or has failed. Periodically (at
least biannually) the operation should also be checked by using diagnostic
equipment, such as a stethoscope or pressure gauge.
Normal: Sound of fluid flow can be heard, and the primary pressure is maintained as
designed.
When the primary pressure is changed, readjust with the PCV-1 adjustment screw.
Parts Inspection
When parts have been removed, or during periodic inspections, use the following
table to inspect the parts and replace any that are found to be defective.
Procedure
Coil Spring:
Check for eccentricity, warping or scratches
Piston, Valve Body:
Check if the piston and valve body move
smoothly in the cylinder against the valve seat
Piston:
Check for deformation or scratches
Valve Body:
Check for deformation or scratches
O-ring:
Check for damages
Back-up Ring:
Check for damages
Nut:
Check if it is loosened
Valve Seat:
Check for deformation, scratches or build-up
Product Inspection
After performing maintenance work etc. which requires the removal of the product
from the installation location, confirm that any location where the product is to be
installed for any purpose or application (such as conducting a service check), is
within the service environment of the product specifications. After which, adjustment
should be carried out according to the
“Adjustment” section.
When there is an abnormal leak even while the valve is fully closed, disassembly and
cleaning should be carried out according to the remedies in the
“Troubleshooting”
section.
Do not tighten the adjustment screw +2 turns or more than the reference position.
When carrying out pressure adjustment etc., do not tighten the
adjustment screw further than its lower limit (when the coil spring is fully
compressed and the adjustment screw cannot turn any further).
Failure to observe this precaution may damage the product, leading to
fluid discharge, which may cause burns or other injury.
CAUTION
