Mankenberg RP 824 Originalbetriebsanleitung Seite 23

Original operating manual
pilot-operated pressure regulators RP 824
Malfunction
Main valve
does not close
or does not seal at
zero demand
Malfunction
Main valve does not
open
(or too slowly)
Main valve oscillates
Restrictor block leaking
* Repairs which have to be carried out at the factory.
RP 824-4.X.231 Issue 17.11.2023
Cause
Cone seal damaged
Valve seat damaged
Main cone jammed
Pilot valve does not close
(jams)
Restrictor D1 closed
Restrictor block dirty
Cause
Restrictor D2 restricts too
much or is completely
closed
Air in pressure reducing
valve
Attenuators D2 + D3
Restrictor valves
Bleed screw
Remedy
» Reseat cone or resurface p.e. by welding and
re-machining.
» Renew (rework) seat resurface by welding and
re-mechaning.
» Check plunger and plunger guides; remove
high spots using fine emery cloth. Check O-
rings and guide straps and renew, if necessary.
» Check valve cone and cone guide for damage
and renew, if necessary.
» Check initial setting. When adjusting the
setting, please make sure that D2 is opened
more than D1.
» Clean all components.
» Blow-through block using compressed air.
Renew seals, if necessary.
Remedy
» Check initial setting. When adjusting the
setting, please make sure that D2 is opened
more than D1.
Restrictor block dirty
Main cone jammed:
» Clean all components
» Check plunger and plunger guides;
remove high spots using fine emery cloth;
check O-rings and guide straps and renew, if
necessary.
» Open restrictor block bleed screw and bleed
block.
» Close D2 and D3 until the valve is stable.
of the valve may be too slow.
» Tighten glands.
Lock Allen screws using Allen key to prevent
setting being altered. Tighten or renew seal, if
necessary.
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