A.R.I. NR-010 EN - Manual

CHECK VALVE MODEL NR-020 , NR-010
MAINTENANCE INSTRUCTIONS
GENERAL INSTRUCTIONS
1. Routine service is an integral part of the
standard procedure for maintenance of a
water supply system.
2. Recommended routine maintenance–
once or twice a year, according to the
quality and kinds of the fluids in the system.
A. Installation
 The valve can be installed either horizontally or vertically,
while the flow is toward the upper part.

Shut-off valve – in order to allow maintenance and removal
of the valve, it is recommended to install a shut-off valve will
before the inlet and / or after the outlet of the valve,
according to the pipeline configuration.

For easy maintenance, the valve will be installed with the
spring and piston unit (1) upward oriented.
B. Periodic Maintenance:
1. Check the flanges tightening bolts twice a year and
retighten if needed
.
2. When the check valve is close under backpressure, check
the reverse flow leakage by external hearing.