Graco Manzel MHH [11/28] Locating and repairing blockages
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Graco Manzel MHH [11/28] Locating and repairing blockages

Graco Manzel MHH [11/28] Locating and repairing blockages
Repair
312497A 11
Locating and Repairing
Blockages
Blocks will cause a higher than normal pumping pressure.
Depending on the application or system design, this blockage
will usually result in a complete loss of lubricant flow into the
total system and no bearing will be receiving lubrication.
The loss of flow due to a blockage is first indicated with the
higher than normal system pressure that is developed by the
pump as it attempts to overcome this blockage. Higher
pressure is limited, isolated and signaled through the use of
various performance indicators, reset and relief, incorporated
into the system design.
Performance Indicators
Performance indicators are pressure-sensitive devices that
pinpoint excessive pressure in the lubricating system.
These devices are installed in the indicator ports of divider
valves, signal a fault either by causing an indicator pin to
protrude or by releasing lubricant into the atmosphere.
Reset Indicator with Memory
Reset indicators stop lube system operation when a fault
occurs. These devices can be used in either master or
secondary divider valves.
When a lube line becomes blocked, the resultant high
pressure pushes the indicator pin through the opening in the
cap. The high pressure prevents the affected divider valve
piston from completing its cycle, causing a pressure backup
through the divider valve which trips a pressure switch
upstream from the valve and shuts off the pump.
The indicator pin remains extended until it is reset manually.
This helps locate the lube line that is blocked.
Rupture Indicator
Rupture indicators are used on MSP/MH divider valve
applications where lube system pressure exceed 2500 psi.
The high pressure from the lube line blockage causes a disc to
rupture. The lubricant then forces an indicator to protrude,
locating the blockage. The high pressure backs up through the
system and trips a switch to shut the system off. When the
fault is corrected, the disc must be replaced and the pin reset
manually.
Automatic Relief Indicator
An automatic relief indicator pinpoints lube line blockage but
allows the lube system to continue supplying lubricant to
points that are not blocked. They are used primarily in
secondary divider valves. The excessive pressure created by
line blockage moves a piston, enabling the lubricant to escape
through a vent. When the pressure is relieved, the spring
resets the piston. Because these devices permit the lube
system to keep operating when a lube point is blocked, a
separate pressure switch connected to an audible alarm
should be used to warn of high pressure.
CAUTION
Never block a lube outlet that is designed to discharge lubri-
cant.

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