The difference between the S type and D type couplers lies in their design and compatibility with specific keg systems. Both couplers are commonly used in Europe for tapping kegs, but they have distinct features that make them suitable for different types of kegs.
1. Design:
– The S type coupler, also known as the European keg coupler, is similar to the D type coupler but has a longer probe. The longer probe allows for a deeper insertion into the keg's valve, ensuring a secure connection.
– The D type coupler, also known as the American Sankey coupler, is the standard coupler used in the United States. It has a shorter probe compared to the S type coupler.
2. Compatibility:
– The S type coupler is primarily used for kegs that employ The System “S” or European keg valve. This system is commonly found in European breweries and is used for kegs from various countries such as Germany, Austria, and the Netherlands.
– The D type coupler, on the other hand, is used for kegs that utilize The System “D” or American Sankey valve. This system is prevalent in the United States and is also used for many international kegs produced for the American market.
3. Applications:
– The S type coupler is commonly used for tapping European beers, including popular brands like Heineken, Stella Artois, and Pilsner Urquell. It is also compatible with some other kegs from European countries.
– The D type coupler is widely used for tapping American beers, such as Budweiser, Coors, and Miller. It is also used for many international kegs that are specifically designed for the American market.
4. Differences in operation:
– When using an S type coupler, the user needs to align the coupler's ears with the corresponding slots on the keg valve before applying downward pressure and rotating the coupler clockwise to lock it in place.
– With a D type coupler, the process is similar, but the coupler is rotated counterclockwise to secure it onto the keg valve.
Personal Experience:
I have encountered both S type and D type couplers during my experience as a brewer and sommelier. In Europe, where I first started my brewing journey, the S type coupler was the standard for tapping kegs. I found that the longer probe of the S type coupler provided a more secure connection, minimizing the risk of leaks or disconnections during the serving process.
However, when I moved to the United States, I had to adapt to the D type coupler, which is the standard here. While the shorter probe took a bit of getting used to, I found that the overall operation was similar to the S type coupler.
The main difference between the S type and D type couplers lies in their design and compatibility with specific keg systems. The S type coupler is used for European kegs, while the D type coupler is used for American and some international kegs. The longer probe of the S type coupler provides a more secure connection for European kegs, while the shorter probe of the D type coupler is suitable for American kegs.