Models 5720 metering pumps are of hydraulically actuated
non-lost motion (amplitude modulated) diaphragm design.
The unique method of actuation by means of a rotating
plunger provides smoother, quieter operation. The design
characteristics minimize back lash and shock loads to
the process system.
Models 5720 are among the longest lasting pumps in
the industry. These pumps will provide reliability in
the heaviest workload environments, such as mining,
nuclear plants, power plants and refineries/petroleum
applications. These pumps meet API 675 standards.
Models 5720 offers maximum capacities from 128 gph
up to 940 psig. The stroking length can be manually
or auto-matically adjusted from 0-100%. The pumps are
available with up to five stroking speeds. All models
may be duplexed.
While the pump is running or stopped, the stroke length
may be manually adjusted from 0 to 100% by using the
micrometer control. Internally, this moves a shift ring.
The unique spring loaded rotating plunger is always
extending or compressing. It displaces hydraulic fluid
through the hollow center of the drive shaft and flexes
the diaphragm for a smooth reliable performance. Repetitive
accuracy is +1%.
Oversized main bearings support the drive shaft across
a very short span, maximizing mechanical efficiency
and ensuring long pump life.
An independent speed reducer allows for two separate
oil reservoirs to match the requirements for both the
hydraulic system using low viscosity oil and the gear
drive using lubricating gear oil.
Materials of Construction
Model 5720 can be supplied with Alloy 20, Hastelloy
C, 316 Stainless Steel or Polypropylene (max. 150 psig)
wetted ends. All diaphragms and seals are available
in PTFE, suited for the most demanding chemical duty
A rugged cast iron housing contains a high performance
rotating plunger submersed in an oil reservoir. The
plunger is the only reciprocating part in the entire
hydraulic drive mechanism.
stroke length adjustment allows effortless capacity
control of 0-100%
pressure up to 940 psig
supply - single phase or 3-phase TE or XP motor.
pressure relief valves
design offers high capacity per square foot of space
ball check valves
efficiency reduces power requirements
or pneumatic capacity control
lift head allows for up to 16' suction lift