F
OR
M
ODELS
: JGI, JGM, JGN, JGP
AND
JGQ
S
ECTION
4 L
UBRICATION
PAGE 4-52
manner, provided that the final pump stroke is not too short. Try and keep the
stroke greater than 20% of maximum; if set for less, the pump is not very reli-
able. If need be, one pump can be closed to stop its flow and the other pump(s)
opened to make the “normal” cycle time, to maintain a stroke greater than 20%
in the functioning pump(s).
Running Conditions
When the machine is running, make sure that the oil level in the lubricator reservoir is at least
one-half way up the sight level, but does not exceed two-thirds.
See your packager's specific data to determine the normal operating conditions, the cylinder
working pressures, and the rated speed.
System Design Considerations and Operating Parameters
To optimize force-feed lubrication system operation, Ariel uses the following general guide-
lines:
1.
Maintain lube ratios within prescribed limits and cycle times as low as possible
(normally 10 sec minimum) to provide each point with lubrication as frequently
as possible.
2.
Multiple pumps with manifolding are used to ensure that 150% of the normal
lubrication rate can be provided during break-in.
3.
Pumps are not allowed to operate below 20% of full stroke, the point at which
they become unreliable.
4.
In some applications, to optimize operation of the lubrication system, a single
divider section is used to deliver lubrication to both a packing and a cylinder.
5.
In some applications, cross-porting of divider valves is used to deliver the proper
proportion of lubricant to a given point.
Force Feed Balance Valves
F
IGURE
4-22 F
ORCE
F
EED
B
ALANCE
V
ALVE
Balance Valves may be used in high differential-pressure dis-
tribution-block applications to reduce system problems such
as bypassing, no-flow switch errors or blown rupture discs.
The force feed balance valve is shown in the Figure.
Setting and Maintaining Balance Valves
Balance valves cannot be set prior to operating the unit.
Ensure that all fittings are tight and any known leaks have
been fixed.
Purge the force feed lube system with a high-pressure hand
pump, using the same injection oil that is used in service, to remove any trapped air or gas in
the system. See Technical Manual Section 7 for pump illustration and part number. DO NOT
