A.R.I. NR050 User Manual

NR-050 TILTING DISC CHECK VALVE MAINTENANCE INSTRUCTIONS
A . INSTALLATION
1. The valve can be installed horizontally.
2. The counter weight assembly will be installed so the arm is turns down at a 45
3. 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.
4. Ball valve – In order to release the pressure and to drain the valve for installation, ball valves will be installed on the outlet and inlet of the check valve, according to the conditions of the pipeline.
5. It is forbidden to weld or to coat the stainless steel shaft. (2)
B. PERIODIC MAINTENANCE
** The periodic maintenance has to be done once or twice through the year, according to the quality and kinds of the liquids in the system.
1. Greasing of the counter weight assembly every year.
Take off the weight by drawing, grease the st.st. shaft and the internal part of the counter weight arm.
2. After draining the valve, remove the cover of the neck (3)
take out the bushing (8) grease and / or replace the Graphite sealing of the bearing (12), in case it is torn.
3. Greasing of the bolts of the weight assembly and the cover bolts.(10)
0
PARTS SPECIFICATION
NO. DESCRIPTION MATERIAL 1 BODY STEEL ST.37 2 SHAFT ST.ST. 3 NECK COVER STEEL ST.37 4 DISC ASS. STEEL ST.37 5 PIN ST.ST. 6 WASHER ST.ST. 7 SLIDE BEARING BRONZE 8 BUSHING BRONZE 9 BOLT ST.ST. 10 BOLT ST.ST. 11 O-RING BUNA-N 12 GRAPHITE
SEALING
13 BOLT ST.ST. 14 SEALING RING ST.ST.
GS
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