SKF KFG, Руководство по сборке

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Page 65
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7. Functional description in single-line systems
7. Functional description in single-line systems
7.1.3 Pressure relief valve
In order to allow another lubrication cycle after
metering is complete, the main line must irst
be relieved of pressure, which also relieves the
downstream single-line distributors. The main
line and single-line distributors relieve into the
lubricant reservoir.
7.1 Functional description of single-line
systems with KFG pump unit
A general single-line system consists of a
pump unit with pump element and pressure
regulating valve, pressure relief valve main line
and single-line distributors.
When the pump motor is turned on, the pump
unit delivers lubricant from the reservoir to the
lubricant outlet. The pump element attached to
the outlet meters the lubricant and delivers it
further through the pressure relief valve at-
tached to the pump element on to the main
line. The lubricant flows through the main line
to the single-line distributors, where it is me-
tered and passed to the lubrication points. This
is performed during or after the pump cycle
time, depending on the type of distributors
used (prelubrication or relubrication distribu-
tors). After metering is complete, the pump
unit is cutoff by a pressure switch and the
pressure relief valve is switched. After the main
line has been relieved, the pump unit is now
prepared for another lubrication cycle.
7.1.1 Pump element
The pump element meters the lubricant
according to the capacity of the connected
single-line distributors. Distributors are avail-
able with different metering volumes.
7.1.2 Pressure regulating valve
A pressure regulating valve must be installed
on the pump element on single-line systems
to prevent excessive operating pressure in the
lubrication system. If the operating pressure
exceeds the cracking pressure of the pres-
sure regulating valve, the valve opens and the
lubricant escapes through the valve or lows
back into the reservoir. This protects the pump
unit against overload.
Single-line system with KFG pump unit
1 KFG unit
2 Pump element with pressure relief
valve with integrated pressure
regulating valve
3 Main line
4 Single-line distributor
5 Pressure switch
5
3
2
1
4
4
4
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