Series Progressive Lubrication Systems Installation Guide
L40000
Page 6
INSTALLING CHECK VALVES
In systems utilizing header lines, check valves should be
placed upstream and in close proximity to all Zero-Leak
solenoid valves that control the lubricant input to the master
feeder valve assem blies. This prevents the lubricant in the
line from draining out should a lubrication point fitting re quire
loosening or disconnecting (see Figure 7).
It is
usually not necessary to install check valves at the outlet
of distribution assemblies. Series-Progressive divider valves
incorporate an integral check valve internally located at each
outlet port, which is effective in preventing lubricant backflow
through the feeder. However, it is important to note that the
pressure will eventually equalize due to metal-to-metal seal
not being “bubble-tight”. Therefore, if it is desired to retain
normal operating pressures within the lubrication lines for long
peri ods of time without running the pump, soft-seat or garter
check valves should be used at the divider valve outlet (see
Figure 8). This also applies to Series-Progressive systems.
Figure 7
Figure 8