XLC 470
13
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- the intervention also called reaction speed regulator* (4) of the main valve, and the opening (3)
and closing (2) speed regulators* of the valve’s main chamber, independent one from the other,
obtained by us fine adjustment needle valves.
- replaceable check valves placed upstream of every regulator to limit the flow and control
the acceleration during the valve opening and closing.
- an upstream outlet not filtered protected by a cap 1/8 G
- an upstream pressure outlet filtered, 1/8 G, protected by an air valve.
- The adjustment is normally done in the factory although it is possible to modify it on the spot, in
order to find the optimal regulation according to the function required.
Herewith enclosed are the optimal values for the most common XLC applications expressed in
terms of revolutions, starting from the fully closed position and turning anticlockwise.
Reaction
speed
Opening
speed
Closing
speed
XLC 410
3
1
5
XLC 410 ND
3
2
5
XLC 410 T
3
1
5
XLC 412
3,5
3
4
XLC 415
3
1
5
XLC 420
3
2
4
XLC 424
3
2
4
XLC 425
3
2
4
XLC 430
3
3
3
XLC 431
3
3
5
XLC 434
3
3
3
XLC 435
3
3
3
XLC 470
3
3
3
The regulators are needle valves designed by us and the rotation permits to obtain a specific
passage. For example the regulation 3 means that, starting from the complete closed needle
(turned clockwise), unscrewing 3 turns in opening you will get the indicated regulation.
Maintenance
The “GRIFO” is particularly sturdy, extremely simple and reliable so it does not require
maintenance but we strongly advise to proceed regularly, at least twice per year, with a clearing of
the filter from dirt and deposits, simply by unscrewing the tap (9) and washing the mesh. This
procedure can be carried out without interrupting the flow through the main valve, and simply by
isolating the main circuit by means of the isolation ball valve and removing the pressure right
upstream of the GRIFO.