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March 1, 2000

2 Min Read
Hot Oil Temperature Control Units Use Negative Pressure

Hot Oil Temperature Control Units Use Negative Pressure

pn21-0300.jpgThermal VAC negative pressure hot oil temperature control units from Budzar are said to maximize production time and manpower and to keep production running smoothly, despite process setbacks, until a convenient stopping point can be reached. They are also said to reduce the potential for oil spills.

In operation, a low-pressure centrifugal pump delivers oil to the process. An on-board vacuum pump then draws oil through the process under negative pressure. If a leak develops, air is sucked in instead of hot oil being forced out. So if the process develops a leak it does not need to be immediately shut down; the process can run under negative pressure until a convenient stopping point can be reached.

Some hot oil temperature control systems use a positive pressure pump to force-feed thermal fluids. In those units, according to Budzar, high-temperature oil is constantly under pressure and if there is a leak in the process equipment, hot oil will rush out of the system and into the mold cavity.

Other negative pressure systems have an inverse relation between vacuum pressure and oil flow. When those systems develop a leak, Budzar says the operator must reduce flow until the leak is stopped. This reduced flow is said to negatively impact production in the form of less heat transfer, larger heat gradients across the process, slower cycle times and inconsistencies in molded parts.

There are four units in the Thermal VAC line with heater sizes of 9, 12, 18 and 24 kw. Maximum temperature is 400 F. Oil flow rates range from 20 to 30 gal/min. There are a variety of cooling options, including 48,000 Btu and 100,000 Btu RS-485 or SPI Communications are also available. Prices start at $7000.

Budzar Industries, Inc.
Willoughby, OH  

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