Europe,
Middle
East,
and
Africa
Only
Type FL
16
g. Remove cover (key 61) on OS/80X Series, or body (key 60)
on Types OS/84X and OS/88X, and proceed as directed in
replacing diaphragm/O-ring section.
h. Remove nut (key 70) and locknut (key 69), then slide off
stem assembly (key 57).
i. Loosen dowel (key 3), unscrew ring (key 9), remove ball
holder (key 5) and check seals (keys 4 and 8) for wear.
l. Clean all parts with petrol, replace any if worn.
Reassembly
Reassemble all parts by reversing the steps in the general
maintenance section.
As you proceed, make sure all parts move freely without
friction. If necessary, lubricate them with Molykote 55 M.
Make sure to:
a. Narrow the gap between nuts (keys 30 and 18) so that
levers (keys 33, 36, and 20) have minimum play yet move
freely without friction.
b. Before mounting minimum spring (key 54), register
position of lever (key 33) by means of nut (key 70),
locking it into place with locknut (key 69).
CauTION
The lever (key 33) is in proper position when
it is exactly horizontal and in the center of
the groove of lever (key 36).
c. Now remount lever assembly (key 17-2), balls (key 10),
keeping them in their seat with grease, and stem
(key 6), which is to be turned so the balls enter their
seats. The stem and lever assembly should now be
tightly fitted together.
d. Remount bushing (key 13), make sure that the dowels are
firmly set in the grooves of the stem (key 6).
e. Repeatedly check if pilot resets properly and, lastly,
remount minimum spring (key 54).
f. Always check pilot setting.
minimum and maximum Setting
a. Make sure that the lever (key 33) is in horizontal position
when pilot is reset. If necessary, use nut and locknut (keys
69 and 70) to adjust (see step b, Reassembly section).
b. Use ring nut (key 50) to completely load maximum
pressure spring (key 53). Loosen screw (key 49) to
completely relieve minimum pressure spring (key 54).
c. Disconnect pressure control pipe (A).
d. Through the pressure control connection, use a small
pump or other appropriate means to raise the pressure to
normal operating level.
e. Reset pilot and reduce the pressure until it reaches
minimum cutoff level.
f. Use register (key 49) to load spring (key 54) slowly
until pilot is triggered.
g. Repeat procedures (d) and (e) above, making any
necessary adjustment in the setting.
h. Bring pressure back to normal values.
i. Reset pilot and raise the pressure until it reaches
maximum cutoff level.
l. Using ring nut (key 50), slowly unload spring (key 53) until
cut-off point is reached.
m. Repeat procedures (h) and (i) above, making any
adjustment necessary in the setting.
CauTION
Whenever minimum or maximum pressure setting
is not required, omit corresponding steps.
PILOT maINTENaNCE
TyPE PRX/120, PRX/125, PRX-AP/120
AND PRX-AP/125 (SEE FIGURE 20)
Installation
a. Make sure that specifications on the pilot plate comply
with the intended use.
b. Make sure that all connections are correctly made.
Startup
Refer to the regulator startup instructions.
adjustment
Adjusting response stability and rapidity is achieved by means of
the appropriate adjusting screws, R (restrictor) and D (damper).
The register D is normally completely unscrewed; by
screwing the register, the response of the regulator can be
slowed down.
The register R is normally completely screwed; in case of
hunting of the set pressure, we suggest unscrewing slowly
the register until pressure steadiness is reached.
By unscrewing the register, the set pressure decreases;
intervene on register screw (key 1) in order to re-establish
the correct pressure.
CauTION
If register R is completely unscrewed, the
regulator can not deliver the maximum
requested capacity.
