An inertia-actuated valve assembly dimensioned for securement along an associated end member (400; 800) of an associated gas spring assembly (GS1; GS2), said inertia-actuated valve assembly comprising: a valve housing (406; 806; 1002) dimensioned for securement along the associated end member (400; 800) and in fixed relation thereto, said valve housing (406; 806; 1002) having a longitudinal axis and including a housing wall portion extending peripherally about said longitudinal axis with a first housing side and a second housing side facing opposite said first housing side, said valve housing (406; 806; 1002) including a groove extending into housing wall portion from along said second side such that said groove has an open end fluidically accessible from along said second side, and said valve housing (406; 806; 1002) including at least one flow channel extending through said housing wall portion and in fluid communication with said groove from along said first side of said valve housing (406; 806; 1002); a valve body extending peripherally about said axis and positioned within said groove of said valve housing (406; 806; 1002) such that said valve body and said valve housing (406; 806; 1002) are axially co-extensive along at least a portion thereof, said valve body having a valve body mass and a pressure area; and, a biasing element operatively engaging at least said valve body and generating a biasing force operative to urge said valve body in a first axial direction toward said first side of said valve housing (406; 806; 1002), said biasing force having a magnitude that is: 1) greater than a predetermined dynamic gas pressure threshold value multiplied by said pressure area with said predetermined dynamic gas pressure value corresponding to an internal pressure experienced by the associated gas spring assembly (GS1; GS2) during a predetermined condition of use; and, 2) less than or approximately equal to said valve body mass multiplied by two and one half (2.5) times the nominal acceleration due to gravity; characterized in that said valve body is axially displaceable relative to said valve housing (406; 806; 1002) between a closed position and an open position such that in said open position said valve assembly has a flow area through which pressurized gas flows with a flow area-to-pressure area ratio within a range of from approximately one-half (0.5) to approximately four. a valve housing (406; 806; 1002) dimensioned for securement along the associated end member (400; 800) and in fixed relation thereto, said valve housing (406; 806; 1002) having a longitudinal axis and including a housing wall portion extending peripherally about said longitudinal axis with a first housing side and a second housing side facing opposite said first housing side, said valve housing (406; 806; 1002) including a groove extending into housing wall portion from along said second side such that said groove has an open end fluidically accessible from along said second side, and said valve housing (406; 806; 1002) including at least one flow channel extending through said housing wall portion and in fluid communication with said groove from along said first side of said valve housing (406; 806; 1002); a valve body extending peripherally about said axis and positioned within said groove of said valve housing (406; 806; 1002) such that said valve body and said valve housing (406; 806; 1002) are axially co-extensive along at least a portion thereof, said valve body having a valve body mass and a pressure area; and, a biasing element operatively engaging at least said valve body and generating a biasing force operative to urge said valve body in a first axial direction toward said first side of said valve housing (406; 806; 1002), said biasing force having a magnitude that is: 1) greater than a predetermined dynamic gas pressure threshold value multiplied by said pressure area with said predetermined dynamic gas pressure value corresponding to an internal pressure experienced by the associated gas spring assembly (GS1; GS2) during a predetermined condition of use; and, 2) less than or approximately equal to said valve body mass multiplied by two and one half (2.5) times the nominal acceleration due to gravity; 1) greater than a predetermined dynamic gas pressure threshold value multiplied by said pressure area with said predetermined dynamic gas pressure value corresponding to an internal pressure experienced by the associated gas spring assembly (GS1; GS2) during a predetermined condition of use; and, 2) less than or approximately equal to said valve body mass multiplied by two and one half (2.5) times the nominal acceleration due to gravity;