mycom SCV Series User Manual

2205Q2JE-HO-S6-N_2020.01.
Chapter 5 Maintenance and Inspection
SCV-series Screw Compressor 5.5 Reassembly
5-52
j) Apply oil on the seal cover gasket [52] and attach it to the seal cover flange by carefully aligning the
oil hole position on the gasket and the one on the flange.
◆ In case of the standard internal oil supply system for the shaft seal block, oil is first sent from the
bearing cover to the seal cover through the oil supply hole machined on them, then from the
notch in the seal cover to the upper part of the seal cover through a groove, and lastly supplied
from the oil supply hole in the seal cover to the upper part of the sliding surface of the
mechanical seal.
k) Apply and flow sufficient lubricating oil on the sliding surface of the mechanical seal assembly.
m) Install the seal cover with the gasket such that the oil drop tube comes to the bottom side.
At this time, carefully install the seal cover not to hit the mating ring in the seal cover with the rotor
shaft. For this, hold the seal cover at the right angle to the rotor shaft or only slightly incline it such
that the top side follows the bottom side.
n) At a midway point, the sliding surface of the seal ring comes in
contact with that of the mating ring. At this point, use a taper
gauge (right picture) to check the clearance between the
surfaces of the seal cover gasket and the bearing cover flange.
This clearance is called "fastening margin" of the seal, and is
used as a guideline in determining the sliding surface pressure
between the rotating ring and stationary ring of the seal. In case
of the BBSE type seals for SCV-series, make sure that this
value is in the range shown in Table 5-12.
Table 5-12 Fastening Margin of the Seal
（mm）
Seal type
160V**
200V**
250V**
320V*D
BBSE
2.0 to 3.0
2.0 to 3.0
3.0 to 4.0
3.5 to 4.5
o) If it is confirmed that the fastening margin of the seal is
appropriate, firmly press the seal cover onto the bearing
cover. While you will feel the reaction of the seal bellows,
keep pressing the cover and fasten two hexagon socket
head cap screws [53] evenly to secure the seal cover at
opposite positions separated by 180°. When there is no
clearance between the surface of the flange and gasket,
tighten all other bolts at the specified torque.
p) After tightening the seal cover, supply oil into the seal
cover while rotating the rotor shaft (right picture).
After this, do not forget attaching the plug for the oil
supply hole of the seal cover.

mycom SCV Series Specifications

General

Brand	mycom
Model	SCV Series
Category	Air Compressor
Language	English