A double regulating valve, also referred to as a balancing valve, is used in plumbing to control water temperature. This type of valve is widely used in showers.
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Double regulating valves are pressure sensitive. They react to pressure changes from the hot and cold water flowing into them. This causes the valve to either open or close a port, thus maintaining pressure balance. Balancing this pressure between the two water supplies keeps the temperature consistent.
When there is a sudden change in water, such as the change caused by flushing a toilet, a balance valve keeps the shower temperatures constant. This means that there will not be a sudden cessation in the flow of cold water when a toilet flushes.
Most new construction is equipped with balancing valves. Replacing an outdated valve in an existing house may require the help of a professional plumber.
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