Understanding the difference between a keg valve and a keg coupler is essential for anyone working with draft systems. In this guide, we explain how these components work together and provide a diagram for easy identification of various types of keg valves and couplers.
What is a Keg Valve?
A keg valve is a critical component located at the top of the keg, acting as a sealed gateway between the beverage and the outside environment. It maintains the drink under pressure, ensuring it stays carbonated, fresh, and flavorful. The valve is designed to remain closed, protecting the contents from contamination or loss of pressure. Only when a compatible coupler is connected does the valve open, allowing the liquid to flow out in a controlled manner, whether for dispensing beer, soda, or other beverages.
What is a Keg Coupler?
A keg coupler is a specialized device that attaches to the keg valve, serving as the key that unlocks the valve. Once connected, the coupler not only opens the valve but also allows CO2 or nitrogen to enter the keg. This gas applies pressure inside the keg, forcing the liquid up through the system and out through the tap. Each type of keg requires a specific coupler to ensure proper functionality; using the wrong one will prevent the valve from opening and block the flow of the beverage.
Types of Keg Couplers and Valves
There are different types of keg couplers, such as the D-type, S-type, and others, which correspond to specific keg valves used by different breweries around the world. Below is a detailed diagram that illustrates the most common couplers and valves for quick and easy identification.
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