A.R.I. NR-010 User 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

2. When the check valve is close under backpressure, check

retighten if needed
.

the reverse flow leakage by external hearing.

Symptom Cause Corrective action

1 The disc doesn’t closes 1) Interference between the

disc motion and an adjacent
shut-off valve (butterfly)

2) Body deformation due to

over tightening of the
positioning bolts.

2 Swelling of the Rubber seal

disc

3 Leakage from the indicator

rode O-Ring

In the majority of cases, the
swelling is caused by the
presence of dissolved Chlorine in
the water principally near the
chlorinator in swimming pools or
treatment stations.
Erosion or chemical attack Change the spring chamber

1) Separate the two devices,

far enough, to avoid any
physical contact between
the NR-020 disc and the
shut-off valve.

2) Check the tightening

moment of the retaining
bolts to a reasoning level
allowing sealing at the
flanges.

The use of N-020 in water
with more than
4-6 ppm chlorine dissolved is
not recommended.

assembly.

A.R.I FLOW CONTROL ACCESSORIES

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