Gardner Denver Reavell H5000 Series, Руководство оператора

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DISMANTLING AND REASSEMBLY OF VALVES
PAGE 39
10 DISMANTLING AND REASSEMBLY OF VALVES
10.1 GENERAL
Keep a spare oiled and maintained set of valve units in store for quick compressor servicing.
Valves when removed should have only a thin carbon layer and be slightly moist with oil.
Valve maintenance is a simple procedure but the following guidelines should be observed.
NOTE:-
Unless replacement of the springs and plates is intended, the order in which these components are
removed should be carefully noted so that the valves
may be reassembled with the same seating faces in contact.
10.2 CLEANING AND INSPECTION – ALL STAGES
The valve components should be degreased using a suitable solvent and stiff brush. Carbon deposits
may be removed scraping with a soft, blunt instrument, e.g. a piece of wood.
WARNING:- Great care should be taken when removing carbon deposits to ensure that the
seating faces of the valve components are not damaged.
These faces should be clean and bright over their whole area, with no evidence of uneven contact.
Renew any plates which are indented, cracked, warped, or have wear grooves which exceed 1/10th of
the plate thickness.
If the seats show severe wear or indentations, the complete valve assembly must be renewed. The
remaining components should be checked for cracks, distortion or other damage liable to impair valve
operation.
10.3 VALVE REMOVAL AND DISMANTLING
Valve removal is as follows for all stages:
(Special tools which are available from Reavell will assist in valve removal.)
Remove valve cover nuts.
Use forcing screws, to remove valve covers.
Using the special valve lifting tools, remove valve assemblies. A gentle rocking action pulling at the same
time will free the valve from any carbon build up in the pocket.
Remove central nut from valve unit. Carefully separate upper and lower bodies and with unit on a level
surface, lift off upper body.
Remove valve plates and springs, noting
very carefully their relative positions to the body and each other
if they are to be re-use
10.4 CLEANING VALVE UNITS
Completely clean all components.
Always renew valve plates and springs in complete sets.
The seating faces of each valve plate and body half should be clean and bright with all round, even
contact and be free from indentations. Any item with indentations will require renewal.
Reassemble valve plates and springs exactly as dismantled. NEVER reverse plates/springs as this will
lead to rapid failure.