1
SECTION 1
DESCRIPTION
1.1 INTRODUCTION
The mRoy pump is a highly reliable controlled vol-
ume pump of hydraulically actuated diaphragm
design. The XT and XW family of mRoy pumps are
described in this manual.
1.2 GENERAL
The mRoy pump capacity is adjustable while the
pump is running or stopped. Capacity adjustment
can be made by manually turning the control knob.
Repetitive accuracy of the metered discharge vol-
ume is maintained within a ±l% range at constant
conditions of pressure, temperature and pump
capacity adjustment setting.
The mRoy pump is a reliable, compact, controlled
volume diaphragm pumps for normal corrosive or
toxic chemicals and light slurries with viscosities up
to 200 S.S.U. (40 cps).
A plunger, reciprocating at a fixed stroke, displaces
a fixed volume of hydraulic fluid which actuates a
flexible, chemically inert PTFE diaphragm to create
pumping action. High quality ball check valves are
used on the suction and discharge to insure con-
sistent metering accuracy. Capacity control is
established by adjusting the volume of hydraulic
fluid which bypasses the diaphragm cavity.
Metering with repetitive accuracy is possible only if
the volume of the hydraulic oil in the displacement
chamber is maintained constant for each stroke.
This is accomplished by mechanically opening the
displacement chamber to the oil reservoir for a
short period at the end of every suction stroke and
the beginning of each pressure stroke. During this
period air or vapor is bled from the system, lost oil
is replenished, and allowances are made for the
expansion or contraction of the oil due to tempera-
ture change. For more information, refer to 1.3
Principle of Operation.
1.3 PRINCIPLE OF OPERATION (FIGURE 1)
Pumping action is developed and controlled by
three basic components as follows (Figure 1):
By-pass ports
in the Plunger
Plunger area shown with
stroke sdjust removed.
Hydraulic By-pass is through
the center of the Plunger
Figure 1. Pumping Action
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