Duff-Norton RAM-PAC - Hydraulic Pump

bleeder
screw
operation
When the
bleeder
screw is
turned in the
"OPEN" direction (counter -clockwise), it
permits the oil pressure to
force the bleeder
screw
ball up off
its seat
and
the oil
can then
flow
through a horizontal passageway back
into the reservoir. The discharge ball remains
closed and the
bleeder
screw
valve, in
effect,
allows the
high pressure oil to by-pass the
discharge valve and return to
the reservoir.
When the
bleeder screw is turned in the
"CLOSE" direction
(clockwise), the
flow of
the high pressure oil
towards the reservoir is
completely blocked and
the oil is held in the
ram until such time that
the bleeder screw is
again
opened.
0 -RING
SEAL
BLEEDER „SCREW
BALL
(
oLk.)
150 -HP
hydraulic pump
The HP -150 Hydraulic Pump is a two -speed,
hydraulic pump which has a
resevoir capacity
of 150 cu. in. of usable
hydraulic oil. It has
a 2 in 1 pump plunger. The larger plunger
(1" diameter) delivers
oil only when there
is no load, or
very light loads, on the ram.
When the oil pressure
exceeds 500 lbs. per sq.
in., the low
pressure relief valve opens and
the oil flow from the
larger plunger cylinder
is by-passed back to the
reservoir, and the oil
flow from the
smaller ( 1 / 2 " diameter)
high
pressure cylinder is directed in
the normal
manner
through the discharge valve into the
hydraulic hose.
Thus, for low pressures of
500 p.s.i. or
less both the 1" diameter plunger
and the 1 / 2 " diameter plunger
pump oil into
the hose. For higher pressures of 500 p.s.i.
and over, only the 1 / 2 " diameter plunger is
utilized to pump oil through the hose to the
ram.
Low
PRESSURE
RELIEF
VALVE
HiGH
PRESSURE
RELIEF
VALvE
4