W 3 2 S E R I E S
H I G H P R E S S U R E B R E A T H I N G A I R C O M P R E S S O R
©ALKIN COMPRESSORS
54
2.5.2 Servicing 1
st
stage valve
The valves must be in good and clean condition at all times for proper operation of the system. The valves
must be checked periodically and maintained.
1.
Disconnect tube connected to the cylinder.
2.
Remove bolts.
3.
Remove the valve assembly from the cover. Replace the new valve assembly.
2.5.3 Servicing 2
nd
stage valve
2nd stage valves are concentric ring type and are similar in construction. To inspect and clean the 2nd stage
valve, observe the following step-by-step procedure:
1.
Loosen the valve acorn nuts.
2.
Remove the valve assembly from the covers. Note the manner in which the valve parts are assembled in
order to replace them in the same order and position after cleaning or installing new parts.
3.
The valve parts can be cleaned by light scraping or stiff brushing (do not use a wire brush!). If necessary,
use a non-flammable safety solvent to loosen dirt, oil or carbon deposits.
4.
Discard the worn, scrateched or broken valve discs and springs. Re-assemble the cleaned (or replaced)
valve parts in their place in the reverse sequence of dismantling and in proper position as shown in the
parts manual. Make absolutely sure that the stop plate is centred properly on its guide; otherwise, the
valve will be damaged when it is pulled up tight in the airhead. Replace the beleville washer on the valve
bolt and tighten the nuts to the torque values recommended.
5.
Before replacing the valve in the air head (the two halves of the top cover), scrape the old shellac off the
valve bolt steel washer and coat it with new shellac to prevent air from leaking under the washer. Replace
the acorn nut and tighten it to the lower limit of the torque value, recommended. Do not over tighten
this nut, since this will distort the springs and plates, causing the valve to leak. After the valve has been
replaced in the airhead. Make certain that the valve operates freely by lifting at its edges with a knife
blade.
6.
Replace the cover gasket between the two cover valves, and between the head and the cylinders; then
replace the air head asembly. Tighten the air head cap screws to the torque values recommended.
IMPORTANT!
Handle the valve parts with care. Do not nick, scratch or bend them.
2.5.4 Servicing 3
rd
stage valve
The 3
rd
stage valve is plate type valve, made of stainless steel for longer service life and relaible operation.
These stages are under particular stress caused by temperatures and high-pressure rates. They should be
periodically checked and maintained as instructed in the Maintenance Table. Refer to illustration on figure.
To disassemble the remove the 3
rd
stage valve, observe the following step by step procedures:
1.
Remove the airhead from the cylinder and pull the valve out of the head. If the valve assembly is covered
with hard carbon, soak the valve in a suitable carbon solvent overnight to permit easier disassembly.
