What device is commonly installed upstream of a steam trap to prevent contaminants from interfering with its operation?

A strainer is commonly installed upstream of a steam trap to prevent contaminants from interfering with its operation. This device typically captures particulates and debris from the steam, ensuring that only clean steam and condensate enter the trap. By filtering out solids, the strainer helps maintain the efficiency and reliability of the steam trap, enhancing system performance and longevity.

Filters and separators serve different purposes in a steam system. A filter is often used for finer particulates but may not be as effective in handling larger debris. A separator is designed to remove water from steam but does not specifically address the capture of solid contaminants. A regulator, on the other hand, manages pressure and flow rather than filtering out contaminants. Therefore, using a strainer is the most effective method for protecting the steam trap from contaminants that could disrupt its function.