end of the crankcase, from where it flows back to
the oil sump via an internal line: this oil stream is
visible behind the sight glass. In the return line an
adjustable lubricating pressure regulator is fitted.
This spring-loaded ball valve allows the return oil
to pass at a certain pressure only, thus
determining the pressure in the lubrication system.
The connection for the oil pressure gauge and the
lubricating oil pressure safety switch is provided
upstream the pressure regulator on the shaft seal
housing.
The oil pump supplies, besides the lubricating oil
pressure, also a separate control oil pressure for
the valve lifting mechanism; for further data refer
to chapter 4.9. Oil pump, filters and control oil
system.
Refrigeration Division
Grasso
4. GENERAL DESCRIPTION THE COMPRESSOR
v002.97.10.en
Refrigeration Compressors Series RC9
Page 4.7
