When a quick opening valve is used as a blowdown valve, where is it located?

A quick opening valve used as a blowdown valve is typically located between the boiler and a slow opening valve. This positioning is crucial because the quick opening valve needs to release potentially hazardous pressure rapidly during the blowdown process, which helps in removing sediment and impurities from the bottom of the boiler. The slow opening valve that follows provides controlled flow and helps maintain a steady, safe discharge of water and steam.

This setup allows for immediate and efficient blowdown when necessary, improving the management of boiler water quality and preventing buildup that could lead to operational issues or damage. The blowdown process involves quickly opening the valve to reduce system pressure and dislodge sediments; hence, having the quick opening valve directly before a slow opening valve ensures safety and precise control.

In other placements, like before the economizer or after the feed pump, the function as a blowdown valve would be compromised. These locations may not be appropriate due to differing pressure levels or function, which could lead to inefficiency or safety risks.