Isoil impianti SpA
Page 13
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Code MA038/00/EN/03
100
%
0
0
⋅
−
=
V
V
V
E
V = Measured by the meter
V
0
= Measured by the proving tank
4.4 Strainer/air eliminator (optional)
The strainer removes all solid impurities from the liquid before it reaches the meter and the
Air eliminator removes entrapped air from the liquid.
The strainer is mounted on the upstream side of the meter.
The air eliminator is mounted centrally on the top of the top of the fabricated steel body of
strainer.
4.4.1 Strainer(Fig.2)
A clean strainer is fundamental for the correct operation of the system; a dirt strainer would
create an excessive pressure drop, leading to the failure of the basket and thus letting dirt,
crusts and other harmful elements to flow into the fluid. If possible, check regularly the
pressure drop between the inlet and the outlet of the strainer; the maximum allowed pressure
drop is 130 kPa.
The basket (2) which is made of stainless steel wire mesh is positively clamped by the end
cover and nut (5,23) a drain plug is provided for draining of liquids inside.
For a correct servicing of the strainer, follow the procedure described below:
•
Discharge the pressure from the system and close the valves at the inlet and outlet
•
Open the drain plug
•
Remove the end cover (5) with o-ring seal (4)
•
Remove and clean the basket; if possible, use a water cleaning machine
•
Check accurately that the basket is intact; if it is found to be damaged, replace with
another one with the same filtering grade:
- For diesel oils:
60 mesh (247 micron)
- For gasoline:
100 mesh (153 micron)
•
Remove and inspect o-ring seal for visual damage, if the rubben sealing rings need
replacement, remove the damaged rings and replace with a news o-ring
•
Put again the basket in place, close the cover and the drain plug.
It's suggested to replace the o-rings between the strainer body and the cover each time the
strainer is disassembled.
4.4.2 Air eliminator
The valve assembly (air vent valve) consists to stainless float connected to the main valve
via multiple linkages (11,12,13). Main valve sits against rubber sealing ring (20) and seals
the air eliminator chamber from atmosphere. Main valve slides in guide provided in bracket
(10). Bracket is clamped to the cover plate (9) by socket head screw (27). An o-ring seal(21)
is provided between body and cover plate.
Follow the instructions below for the servicing of the air eliminator:
•
Discharge the pressure from the system and close the valves at the inlet and outlet
•
Discharge the liquid through the drain plug
•
Remove nuts (22) and lift the cover. Collect o-ring seal.
•
Remove screws (27) and remove bracket from cover plate.