HEROSE 05411, Operating Instructions Manual

Page: 32 / 92

Operating instructions
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7 Maintenance and service
7.1 Safety during cleaning

Take note of the specifications in the safety data sheet and the general occupational health and
safety rules if degreasers are used for process-related reasons for the cleaning of bearing parts,
unions and other precision parts.
7.2 Maintenance
The maintenance intervals must be defined by the user according to the operating conditions.
The recommendations for the functional checking of the check valves are to be taken from section 7.2.1
"Inspection and maintenance intervals" in these operating instructions.
7.2.1 Inspection and maintenance intervals
Recommended intervals
Description Interval Scope
Inspection

During start-up
 Visual inspection
 of the check valve for damage;

of the valving marking for legibility;
 Leak-tightness
 Between cover and body;
 of the valve seat;
 Test the opening and closing functions
of the check valve.
Functional testing  Annually
 Test the opening and closing functions
of the check valve including a visual
inspection.
External inspection  Every 2 years
 Check of function and tightness test
including visual check.
Internal inspection

Every 5 years
 Replacement of all sealing elements,
including a function and tightness test as
well as a visual inspection.
Hydraulic test  Every 10 years

Replacement of all sealing elements,
including a function and tightness test as
well as an inspection.
7.3 Fault table
Fault Cause Remedial action
 Leak between bonnet
and body Bonnet loose  Retighten the bonnet bolts
Seal damaged  Replace seal
 Leak in the seating Foreign body between cone
and seating  Remove foreign body / flush the
system
Seating damaged  Replace the body
Cone seal damaged 
Replace the cone
 Body leaking
Discontinuity/gas cavity open 
Replace the body
 Check valve does not
open / close
Cone stuck  Replace the bonnet and cone