RE: [Chrysler300] 57 heater control valve

["Bob Jasinski" <rpjasin@xxxxxxxxxxx>]

Marshall,
 
I will defer to your description of the heater control valve tube called a
capillary tube more correctly than a bourdon tube.  It is as you described,
and it is fixed at time of manufacture.  So it contains mercury vapor, not
some other gas or liquid mercury ?  I guess that would explain why I have
not seen anything come out of a broken one, wasn't sure what was in there
that acted against the bellows.  
 
Bob  J 

  _____  

From: Chrysler300@xxxxxxxxxxxxxxx [mailto:Chrysler300@xxxxxxxxxxxxxxx] On
Behalf Of Marshall Larson
Sent: Monday, January 19, 2009 12:28 PM
To: chrysler300@xxxxxxxxxxxxxxx
Subject: [Chrysler300] 57 heater control valve



Sorry but the Bourdon Tube is a flattened oval the length and diameter is
determined by the task they are to perform. They use air and may be
sealed or open at one end. The are the measuring device used in vacuum
and pressure gauges that use a pointer that moves over a graduated dial.

The device you are talking about is a capillary tube filled with mercury
vapor and always sealed. They are 1/8th inch in diameter or less and
their length is determined by their application can be two inches to many
feet long. They are widely used for expansion valves and cold controls
in refrigeration and water based heating systems. Unlike the Bourdon
Tube, their operation range is quit narrow and is fixed at the time of
manufacture.

Marshall

On Mon, 19 Jan 2009 10:11:31 -0800 "Bob Jasinski" <rpjasin@pacbell.
<mailto:rpjasin%40pacbell.net> net>
writes:
> Lindsey,
> 
> The bourdon tube is a sealed tube about 1/8" thick and is installed 
> in the
> air stream path. It is filled with a gas (probably air I'm not 
> sure) that
> applies pressure to a bellows that opens and closes the heater 
> control valve
> like a thermostat in your home. It is designed to maintain a 
> constant
> temperature within the car's interior based on what the driver sets 
> it at.
> The heater control valve without the tube just maintains a fixed 
> amount of
> coolant flow through the heater core, it is not regulated 
> automatically,
> only by the fixed setting via the temp control handle.
> 
> Bob J
> 


 


[Non-text portions of this message have been removed]


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