2205Q2JE-HO-S6-N_2020.01.
Chapter 5 Maintenance and Inspection
SCV-series Screw Compressor 5.4 Disassembly and Inspection
5-32
Pulling out the Unloader Slide Valve Separating the Unloader Slide Valve
and Variable Auxiliary Slide Valve and Variable Auxiliary Slide Valve
5.4.10.2 Inspection
a) With the unloader slide valve and variable Vi auxiliary slide valve mounted in position, check the
step height between the slide valves and the rotor casing surfaces. Generally, the surface of the
slide valves should be lower than the surface of the rotor casing. If the top surface of the slide
valves has a trace of hitting the rotor, the probable cause is that the slide valves are worn or the
rotor shaft/bearing is worn. Please contact our sales offices or service centers
b)
Inspect the sliding surfaces of the unloader slide valve and variable Vi auxiliary slide valve that rub
against the main rotor casing. If any scratch and/or contact mark of casing with slide valve is found,
the compressor is in bad condition. Examine their causes, e.g., lubricating oil contamination,
entering foreign materials, and loosening of fastening portion. After identify the cause, take
necessary measures.
c) If there is a discoloration like oil burned around the discharge port of the slide valve, oil compression
operation may be occurring. In this case, please contact our sales offices or service centers, too.
d) Replace the two O-rings [450] and O-ring [523] with new ones.
e) Replace the Teflon bushing [448], if any wear is found.
●
Two O-rings [450] are fitted on the following portions.
･ 160 to 250V** models: on the Vi adjusting rod
･
320V*D models: on the O-ring groove located at the
Vi adjusting rod passes part in the bearing
cover
f) Remove oil injection line plugs on the rotor casing, and confirm those oil lines are not clogged by
using the compressed air and like. After confirming and cleaning the oil lines, do not forget to attach
the plugs to the original positions.
Oil Injection line Plugs
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