A.R.I. NR-040 User Manual

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MODEL “EREZ” NR-040

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.

 The counter weight assembly (1 ) will be installed

so the arm turns down at a 45
valve closes.

 Shut-off valve – in order to allow maintenance and

removal of the valve, a shut-off valve will be
installed before the inlet and / or after the outlet of
the valve, according to the conditions in the
pipeline.

 It is recommended drainage valves before and after

the valve in order to release the pressure and to
drain the line.

 Stainless Steel shaft (15) – it is forbidden to weld

or to coat the shaft.

0

angle when the

B. Periodic Maintenance

1. Greasing of the bolt and key of the counter weight.

2. Greasing the bolts of the valve’s cover (lid) .

3. Brush painting of the surface area of the valve body.

4. In case the valve is installed in waste water system , open the valve’s

cover and wash the internal part from dirt, solids and debris

Symptom Cause Corrective action

1 Leakage from the

shaft O-Ring

2 The seats no

properly sealed
(reverse flow
occurring)

1) O-ring Elastomer
deterioration.

2) Shaft Erosion at
O-rings contact

1)Hard solid stuck on the
seats

2) Elastomer deterioration.

1) Change the
O-rings plugs.

2) Replace the complete
shaft.

1) Open the upper lid and
clean both the two
seats. If needed,
replace the body seat.

2) Replace the rubber-
lined disc.

3) Exaggerated clearance
between the internal parts

3) Change the complete
disc and arm assembly

due to Erosion

3 The micro switch

is out of function

The micro switch roller is
no more in contact with the
actuator came

Check the tightening of
the came retaining bolt on
the shaft. Carefully fix the
came in the right position
for correct indication.

4 Leakage from the

upper cover

Defective O-ring seal Change the lid O-ring

seal

A.R.I FLOW CONTROL ACCESSORIES

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