Which of the following best describes the main purpose of a drain valve in a steam system?

The main purpose of a drain valve in a steam system is to release condensate safely. In steam systems, water is converted to steam for heating or power generation. As steam moves through the system, it can cool and condense back into water, creating condensate. This condensate must be removed to maintain the efficiency of the system and prevent issues such as water hammer or reduced heating capacity.

The drain valve provides a safe method to discharge this condensate from the system. Properly managing condensate prevents the buildup of excess water, which can lead to operational problems or inefficiencies. By allowing for controlled drainage, the valve helps ensure that the steam system operates smoothly and effectively.

The other options relate to different functions within steam systems but do not specifically address the primary role of a drain valve, which is focused on the removal of condensate.