What is a Liqui-Mover
®
Pump?
A Liqui-Mover pump is a positive displacement pressure powered pump with a minimum of moving parts.
The pumping action is accomplished using a positive pressure to push the liquid from the pump tank into
the return line. The Liqui-Mover pump can handle high temperature and high pressure condensate without
difficulty.
The float actuated Liqui-Mover pumps are available in 3 basic models. They are available in many configu-
rations, from individual components that are field assembled to complete packaged systems ready for con-
nection to field piping. A basic Liqui-Mover pump consists of a receiver/reservoir, pump tank, inlet and out-
let check valves, snap acting float operated level control, and various other fittings.
How a Liqui-Mover Pump Works
In describing “How a Liqui-Mover Pump Works”, it is best to view it as three distinct stages. These stages
are described below:
Float Activated Level Control
STAGE ONE:
In the fill cycle, fluid flows from the receiv-
ing chamber (A) through the inlet check
valve (B) into the pumping chamber (C),
and raises the float (D). The vent port (E)
is open to equalize pressure between the
receiving chamber and pumping chamber.
STAGE TWO:
When the float reaches its highest level, a
spring assembly (F) activates the linkage
(G), which closes the vent port (E) and
opens the motive pressure port (H). When
the pressure in the pumping chamber
exceeds discharge line pressure, the dis-
charge check valve (I) opens, and the dis-
charge cycle begins. As the fluid level goes
down, so does the float. During this cycle,
incoming fluid is stored in the receiving
chamber.
STAGE THREE:
Once the float (D) reaches its lowest
position, the linkage (G) closes the
motive pressure port and opens the vent
port (E) so the two chambers can equal-
ize in pressure to start the cycle again.
A
E
B
D
C
E
H
G
F
I
E
D
G
