January 17, 2017

By  Dorian Bodnariuc

In the coffee maker industry there are many devices that are equipped with a valve. The use of a valve is different though from a coffee brewing method to another. Immersion coffee makers such as coffee drippers, use a valve to control the steeping time. A simple valve is often found on automatic drip coffee machines as a way to temporarily stop the dripping for pouring a cup.

Some espresso machines are also equipped with a valve for regulating the pressure during brewing, (Over Pressure Valve, or OPV). Many advanced heat exchanger espresso machines are equipped with vacuum breaker valves. The purpose of the vacuum breaker valve is to release the vacuum pressure that is created when the espresso machine boiler cools from a very hot state to room temperature. Almost all semiautomatic espresso machines have a steam valve. The purpose of the valve is to open and close the steam on the milk frother. A leaking steam valve will cause the pressure to drop during espresso brewing.

A valve is a device that regulates, directs or controls the flow of a fluid (gases, liquids, fluidized solids, or slurries) by opening, closing, or partially obstructing various passageways. Valves are technically valves fittings, but are usually discussed as a separate category. In an open valve, fluid flows in a direction from higher pressure to lower pressure.

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About the author

My name is Dorian and I am a former barista. I consume coffee in any form, as a beverage, in savory recipes and desserts. My favorite caffeinated beverage is the espresso.

I love to share my coffee brewing knowledge and my geeky coffee research. This blog is one of the places I write about coffee. More about Dorian... If you want to learn more about this site and how I started it, check our About Me page, where I explain all about it.