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Page 8 Portable Hot Oil Temperature Control Units
Heater Tank
The portable hot oil temperature control unit features a single pass heater tank. The tank is
designed to maintain an optimum balance of fluid velocity versus watt density, and
turbulence for excellent heat transfer, and minimal pressure drop. The high fluid velocity will
greatly prolong the life of the heater and fluid.
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 6-2 on Page 35 for more information.
The pump is capable of running in either direction. Thus, the optional 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 the 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
by-pass 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 the
pressure requirements exceed the rated pressure, the fulflow valve will open and bypass the
necessary fluid to prevent high pressures.
Ful-Flo Valve
A regulating by-pass 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 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 will open and divert fluid from the
delivery TO PROCESS line to the FROM PROCESS line. A constant flow of fluid is
maintained through the heater tank to prevent damage to the heating elements and fluid.
Cooling
Optional
The manufacturer-designed shell and tube heat exchanger is provided as optional equipment
in this unit. The design features straight-tube construction and copper-nickel tubes for
durability and optimal heat transfer.
Additionally, check valves are installed on the water supply and drain lines to prevent water
from back flowing into the heat exchanger from a closed drain or into the water supply
piping.