Functional Description; General Description; Major Sub Assemblies (Figure 1); The Power End Sub Assembly (Figure 2) - ProMinent ProMus Series Operating Instructions Manual

4.

Functional description

4.1
The Prominent ProMus is an electric motor (1) driven lost motion metering pump incorporating a
hydraulically balanced Teflon (2) diaphragm. The drive case (3) is cast iron incorporating a worm gear
set (4) (5 Ratios available) driving a rotating eccentric (5). The locking stroke adjuster (6) varies the flow
from 100% to 0% in 1% increments. The hydraulic end transfers the rotating eccentric (5) motion to the
diaphragm (7) (three sizes) movement by way of a reciprocating plunger (8) (8 plunger diameters available).
The plunger (8) and diaphragm (7) are hydraulically coupled (no mechanical connection). Coupling
compliance is precisely controlled by a mechanically actuated replenishment valve (9), which senses
diaphragm (7) position to admit coupling fluid as required. The coupling fluid is automatically degassed
to maintain accuracy and drive case is protected from overload by a simple acting relief valve (10). The
hydraulic end is separated from the fluid end by a Teflon (7) diaphragm completely isolating the pumped
fluid from the surroundings. The fluid end (11) is available in Stainless Steel, Alloy 20 Hastelloy C and
PVDF. All fluid end seals are Teflon.
4.2
The pump is divided into four major sub assemblies. They are the Power End, the Hydraulic End, the
stroke adjuster and the Liquid End. The Stroke Adjuster can be either manual or electric. There are three
Hydraulic ends that can mate with the single Driver end. The three Liquid Ends correspond with three
diaphragm sizes. The three Liquid ends are designated Size 17, Size 30 and Size 40 to reflect the working
diameter of the diaphragms.
4.2.1
The pump is driven by an electric motor (1). The standard frame size is Nema 56c. An IEC 71 frame is
available by specifying a motor adapter (12) and worm that mate with the IEC motor. The motor (1) is
close coupled to the worm (4). A hardened steel worm (4) and a bronze worm gear (13) reduce the speed
of the motor (1). Five ratios are available. 12.5:1, 15:1, 30:1, 40:1 and 50:1. The stroke speeds are 138/
min, 115/min, 58/min, 43/min and 35/min at 1725 RPM and 116/min, 97/min, 48/min, 36/min and 29/min at
1450 RPM. Simple Harmonic motion is generated by way of a rotating eccentric assembly (5). A needle
cage and roller assembly allows for the rolling action of the outer race of the eccentric assembly. This
rolling action minimizes the both the wear and the heat generated at the Eccentric Assembly (5) Plunger
(8) interface. The cast iron drive case (3) serves as a support for the worm, the eccentric assembly and
eccentric support shaft. It also doubles as an oil reservoir for the hydraulic end The oil in the reservoir also
serves as the lubricant for the gear set and bearings. A suction strainer (14) is part of the drive case (3). It
removes particulate before it enters the hydraulic end. A sight tube (15) for observing oil flow from the relief
/air bleed valve (16) is also part of the drive case (3).
4.2.2
The 10-turn stroke adjuster (6) provides for lost motion pump flow control by holding the plunger (8) away
from the eccentric assembly (5). It continuously adjusts the pump flow from 0% to 100%. A micrometer dial
(17) indicates the % setting in 1% increments. The pump stroke is .787 inches (20 millimeters). The manual
stroke adjuster knob is locking by way of a thumbscrew.
An electric actuator is also available accepting 4 to 20 mA control signals for remote flow control. The
actuator are close coupled to the pump and do not require an additional base.
4.2.3
The hydraulically balanced system is separated from the process fluid by a flat uniform thickness
Teflon diaphragm (7). The reciprocating motion of the plunger (8) is transferred to the diaphragm (7)
by hydraulic oil. There is no mechanical connection between the diaphragm (7) and the plunger (8). A
compression spring (20) provides the force to return the plunger (8) on the suction stroke. There are three
subassemblies in the Hydraulic End. The relief/air bleed valve (16), the oil replenishment valve (9) and the
oil replenishment check (21).
4.2.3.1
An adjustable relief valve is part of the hydraulic system. The sole purpose of the relief valve is to protect
the drive subassembly from overload in the event there is excessive pressure of the pumped fluid. A
poppet (16) is held against a replaceable seat (22) by a spring (23). The tension in the spring is adjustable
by an adjusting screw (24). When the force of the spring is exceeded by the hydraulic pressure acting at
the seat area, the poppet (16) lifts allowing oil to escape back to the reservoir. Included in the poppet (16) is
an air bleed valve. The purpose of the air bleed valve is to allow entrained air to escape from the hydraulic
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Functional Description

General Description

Major Sub Assemblies (Figure 1)

The Power End Sub Assembly (Figure 2)

The Stroke Adjuster Sub Assembly (Figure 2)

The Hydraulic End Sub Assembly (Figure 2)

Internal Relief/air Bleed Valve (Figure 2)

ProMinent