Hydraulic and Pneumatic Knowledge
Fluid Power Equipment
Basic Hydraulic Jack System Schematic
Hydraulic Jack. In this system , a
reservoir and a system of valves has been added to a simple
hydraulic lever to stroke a small cylinder or pump
continuously and raise a large piston or an actuator a notch
with each stroke. The top view of within the diagram below
shows an intake stroke. An outlet check valve closes by
pressure under a load, and an inlet check valve opens so that
liquid from the reservoir fills the pumping chamber. The
lower view of the diagram shows the pump stroking downward.
An inlet check valve closes by pressure and an outlet valve
opens. More liquid is pumped under a large piston to raise
it. To lower a load, a third valve (needle valve) opens,
which opens an area under a large piston to the reservoir.
The load then pushes the piston down and forces the liquid
into the reservoir.