An automatic aeration device includes a first floating roof, a second floating roof and a movable valve. The first floating roof has a through hole and a first enclosure. The second floating roof is disposed in the through hole and has a second enclosure. The movable valve is disposed above the first floating roof and the second floating roof and has a plate which has an outer wall and an inner wall. The outer wall is mounted in the first enclosure and has a plurality of first vent holes. The inner wall is mounted in the second enclosure and has a plurality of second vent holes. The automatic aeration device further includes a plurality of balls mounted between the first enclosure and the outer wall, and mounted between the second enclosure and the inner wall.

A pressure relief device for a double isolation valve comprises a body with a valve cavity. The valve body has a pocket formed therein. A disc is disposed in the central section of the pocket. The disc is interposed between two spring-actuated seats. Each of the seats is in fluid communication with opposing valve sides. The pocket central section is in fluid communication with the valve body cavity. Each of the seats is provided with two different types of gaskets in series. In operation, reverse pressure causes retraction of the seats, thereby relieving valve body cavity overpressure.

Multi-function valve assemblies are provided for use in automotive components, such as traction battery packs, for example. An exemplary multi-function valve assembly may include a valve housing, a first valve body movably positioned within the valve housing, and a second valve body movably positioned within the valve housing. The first and second valve bodies may be moved between positions in which the valve bodies are seated against one another and other positions in which the valve bodies are unseated relative to one another to provide various valve functions. The multi-function valve assembly may be configured to provide functions such as degassing, pressure equalization, leak testing, etc.

Multi-function valve assemblies are provided for use in automotive components, such as traction battery packs, for example. An exemplary multi-function valve assembly may include a valve housing, a first valve body movably positioned within the valve housing, and a second valve body movably positioned within the valve housing. The first and second valve bodies may be moved between positions in which the valve bodies are seated against one another and other positions in which the valve bodies are unseated relative to one another to provide various valve functions. The multi-function valve assembly may be configured to provide functions such as degassing, pressure equalization, leak testing, etc.