Duff-Norton RAM-PAC - Page 3

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I

I

EXPLANATION OF

RAM

-PAC

DESIGN

SUCTION

BALL

(:7

,

DIA.)

UP

DISCHARGE

BALL

(

DIA.)

suction

stroke

On

the

upward

stroke

of

the

operating

handle,

suction

is

developed

in

the

pump

cylinder

which

draws

in

a

charge

of

hy-

draulic

oil

from

the

reservoir.

The

suc-

tion

ball

prevents

any

return

flow

to

the

reservoir.

DOWN

CPERATING

HANDLE.

SUCTION

BALL

(i

DIA.)

PULAR

CYLikiDER

DISCHARGE

BALL

4i

DIA

)

power

stroke

As

the

operating

lever

is

forced

down,

the

suction

ball

seats

and

prevents

the

hydraulic

oil

from

returning

to

the

res-

ervoir,

and

hydraulic

pressure

is

built

up

in

the

pump

cylinder.

As

soon

as

the

hydraulic

pressure

in

the

pump

cylinder

exceeds

that

in

the

hydraulic

hose,

the

discharge

ball

is

moved

off

its

seat

and

thus

permitting

a

charge

of

hydraulic

oil

to

flow

through

the

hose

and

into

the

ram.

The

load

on

the

ram

is

raised

stroke

-by

-stroke

and

the

discharge

ball

prevents

any

return

flow

during

the

in-

tervening

suction

strokes.

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