WARNING
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-
PERIODICAL CHECKS
CAUTION
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Slowly close the outlet cut-off valve and check pressure in
the length of pipe between the regulator and the valve.
If the system is functioning properly, an increase in outlet
pressure will be noticed due to lock-up pressure, after which
pressure will stabilize.
If, on the contrary, outlet pressure continues increasing, the
system is not functioning properly due to improper valve disc
tightness. In this case, close the valve located upstream of
regulator and carry out maintenance procedures.
(if installed)
See the Instruction Manual 0048EN-OS66-IM.
MAINTENANCE
WARNING
representatives or our authorized dealers.
The regulator and it’s pressure accessories are subject
to normal wear and must be inspected periodically and
replaced if necessary.
The frequency of inspection/checks and replacement
depends upon the severity of service conditions and
according to applicable National or Industry codes,
standards and regulations/recommendations.
In accordance with applicable National or Industry codes,
standards and regulations/recommendations, all hazards
covered by specic tests after nal assembling before
applying the CE marking, shall be covered also after every
subsequent reassembly at installation site, in order to ensure
that the equipment will be safe throughout its intended life.
Before proceeding with any maintenance work, shutoff the
gas upstream and downstream from the regulator, also
ensure that there is no gas under pressure inside the body
by loosening the upstream and downstream connections.
Servicing does not require removal of valve from the line.
Replacing Seal Pad
a. Unscrew the adjusting screw (key 1), unscrew the tube
(key 3) and slide out the spring (key 66); unscrew the
screws (key 29) and dismount the cap (key 28) or (key
126) for the monitor versions.
b. Lock the stem (key 32) by inserting a suitable wrench in
the appropriate slots (see letter A in Figure 7).
c.
Hold the stem locked and unscrew the pad holder (key 31).
CAUTION
Only for the monitor version before to dismount the pad
holder (key 31) it is necessary to dismount the counter-
balancing system:
Lock the monitor stem (key 130) by inserting a suitable
wrench in the appropriate slots (see letter B in Figure 7)
and dismount the nut (key 65). Disassemble all the parts
of the counterbalancing system.
Check the shaped diaphragm (key 9), or the O-ring
(key 7, 120 and 123 for the AP e APA versions). Hold
the stem (key 32) locked and unscrew the monitor stem
(key 130). Dismount the pad holder (key 31).
d. Replace the pad (key 34). During this phase, the seat
(key 35) and the O-ring (key 36) can be checked and
replaced, if required. In order to do this, open slam-shut
valve shutter and keep it open while unscrewing the seat
with the appropriate wrench.
With the slam-shut valve shutter still kept open, mount a
new seat.
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