Definition:
To spund is German for bung, meaning to close up or seal. Spunding in brewing refers to the act of closing off a vessel containing beer or wort and allowing pressure to build inside the liquid. This is useful in the natural carbonation of a beverage such as beer. The spunding valve is a device consisting basically of a pressure gauge to show vessel pressure, and some way to release overly wanted pressure from that vessel. Normally something such as a adjustable back-pressure relief valve is used to control a set pressure, venting any excess gas out of the vessel.
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