NEW AVT COOLING VALVE FOR SENTRA TEMPERATURE CONTROL UNITS

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• An improved 3rd generation AVT™ (Advanced Valve Technology) modulating valve is installed on Sentra temperature control units manufactured starting in March 2002.
• This document describes the design changes and their inherent benefits.
• The chart below compares the new AVT™ cooling valve introduced in 2002 with the valve introduced in 1996.

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• Valve Body
• New '02 AVT™ Valve : Valve : Valve body is stainless steel.
• Benefit : Longer life, less prone to contamination damage.
• Old '96 AVT™ Valve : Valve body is brass.

• Valve Duty
• New '02 AVT™ Valve : Designed for modulation valve duty.
• Benefit : Longer life.
• Old '96 AVT™ Valve : Modified for modulating valve duty.

• Stem Seal
• New '02 AVT™ Valve : Utilizes O-ring for stem seal.
• Benefit : Longer life. The O-ring is replaceable in the new valve at a cost of about $5. The '96 valve has a packing nut that must be tightened periodically to stop leaks. Tightening the packing nut increases the torque required to turn the valve adding to stress on the drive system. Field rebuilding of the '96 valve is not recommended. Valve and coupling replacement cost for the '96 valve is approximately $65.
• Old '96 AVT™ Valve : Modified for modulating valve duty.

• Drive Stem
• New '02 AVT™ Valve : Square drive stem.
• Benefit : Allows for the use of one piece coupling that provides better control.
• Old '96 AVT™ Valve : Threaded drive stem.

• Mounting
• New '02 AVT™ Valve : Valve has mounting flange allowing the motor to directly mount for easy alignment.
• Benefit : Provides more rigid mounting and eliminates alignment concerns (uneven stem wear), provides longer life and better control.
• Old '96 AVT™ Valve : Valve body has no mounting flange which requires the motor to be mounted separately on the casting making alignment critical.

• Coupling
• New '02 AVT™ Valve : Mounting flange and square drive stem allow a one piece extruded coupling with NO set screws.
• Benefit : No chance of set screws loosening to cause sloppy control.
• Old '96 AVT™ Valve : Mounting geometry requires a two piece coupling with 4 set screws.

• Cover
• New '02 AVT™ Valve : High temp ABS drip cover.
• Benefit : Sleek, high tech look.
• Old '96 AVT™ Valve : Aluminum drip cover.

For more information about AVT modulating valve for temperature control units call the Advantage Sales Department at 317-887-0729.

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