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What is a counter pressure filler?

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6 answers

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A counter pressure filler is a special filler used to fill carbonated products such as beer, sparkling wine, and sparkling cider. The beer or product is chilled to reduce foaming due to temperature differences. The bottle is first pressurized with CO2, the fill valve is opened and the CO2 is then vented to allow the bottle to fill from the bottom. 
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Counter pressure refers to the bottle or can being pressurized to a level high enough to maintain the CO2 in solution during the filling process.  The amount of pressure required will vary based on the conditions of the carbonated beverage being filled.  Generally speaking minimum counter pressure will be adequate to maintain the CO2 in solution of the beverage for the temperature it is when it reaches the bottle. Counter pressure must be maintained at or above the minimum during the entire filling process to avoid excess foaming and CO2 loss.
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Counter pressure is the standard for filling, which is the use of CO2 pressure purged into the can or bottle prior to the beer or liquid fill. Counter pressure filling reduces oxygen if the fills and better controls fill levels.
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Counter pressure filling is the process of pressurizing the container with inert gas to equal the pressure of the incoming liquid.  Then, in a controlled manner, relieving the pressure in the container to allow the liquid to displace the gas.  The point of this is to maintain pressure on the liquid to keep dissolved gases in a dissolved state within the liquid solution and to avoid the CO2 (or Nitrogen) from escaping the liquid.

The Martin Robotics Counter Pressure Filler & Crowner does precisely this.
Sarah Martin 
Martin Robotics.
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From brewwiki.com

A Counter Pressure Filler is a device used to fill bottles from a pressurized source such as a keg without losing carbonation. Commercial brewers use these devices to bottle beer for retail sale. Homebrewers can also use simple counter-pressure fillers to bottle beer directly from a keg. Kegged, carbonated beer and a carbon dioxide (CO2) tank are needed to operate a counter pressure filler.A counter pressure filler has a long tube that fills from the bottom of the bottle and a stopper seal that seals the bottle. The filler has two inputs - one for CO2 gas and the other being the actual beer line. Designs also include a vent to allow venting of gas from the top of the bottle during the fill. A valve on each input and the vent let you control the pressure and speed of filling and venting.  XpressFill offers a Carbonated Beverage Counter Pressure machine XF2500.
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Counter pressure fillers are typically used for carbonated products where the container is pressurized prior or part of the filling process.
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