WTR2-640
Chapter 2: Functional Description
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Pump
The pump is a mechanical seal, positive displacement pump. It features a nearly maintenance
free design, and was selected after extensive testing to provide superior performance, flexibility,
and low maintenance. It is well suited for use with a variety of commercially available heat
transfer fluids. The pump has only two internal moving parts, and a specially designed seal to
give years of trouble free service, even at high temperatures. The only routine maintenance
required is the monthly greasing and occasional head space adjustment; see Section 5-3 on Page
40 for more information.
The pump is capable of running in either direction. Thus, the pump reverse feature can be used
to draw fluids back from the process. It is not necessary to install a service air line to purge
lines before changing molds. Since the pump is capable of achieving extremely high pressures,
it is necessary to regulate the pressure through use of a regulating bypass line (Ful-Flo valve).
Because the pump is a positive displacement pump, it will supply the process with rated flow at
or below the rated pressure.
The flow is constant until the pressure reaches the rated pressure. The pressure however is a
function of frictional losses through the process that it is attached to. Systems with large
process connections, ports, and piping will operate at low pressures. While systems with small
process connections, ports, and piping will operate at higher pressures. Once pressure
requirements exceed the rated pressure, the Ful-Flow valve will open and bypass the necessary
fluid to prevent high pressures.
Ful-Flo Valve
A regulating bypass line featuring a Ful-Flo valve is standard in all units. This is a safety
device to prevent excessive pressure in the event that the delivery line is obstructed. Each Ful-
Flo valve is factory preset to limit system pressure as specified by the customer. It must not be
tampered with in any way.
In the event of an obstruction in the line, the Ful-Flo valve will open and divert fluid from the
delivery TO PROCESS line to the return FROM PROCESS line. A constant flow of fluid is
maintained through the heater tank to prevent damage to the heating elements and fluid.
Connection Lines
Connections for TO PROCESS and FROM PROCESS lines are 1” NPT (25.4 mm). Water
connections for COOLING WATER SUPPLY and COOLING WATER DRAIN are
¾
” NPT
(19.1 mm). The customer is responsible for conversions to metric standards.
The manufacturer stocks many lengths of flexible metal hose; the part number is 572-16969.
State the length of hose you want when ordering.
Component failure may result in high-temperature oil spray, causing serious injury or death.
Make sure hoses, valves, and other components installed in your process can withstand
maximum temperature and pressure of the Upright unit; check unit nameplate for specific
capacities. All components must be carefully inspected for condition before installing. Make
sure factory components if you have any doubt.
Electrical System Controls
The electrical controls of your Upright unit are specially engineered for reliability, safety, and
simplicity of operation. Switch functions are clearly labeled. Your Upright unit has a system
status board so you can evaluate the status and performance of the unit at a glance. Pilot lights
are provided to indicate key unit functions.
