Check valve assembly

A check valve assembly (1, 1′) for a shock absorber (100) comprising

• a housing (10), said housing (10) comprising
• a first volume (11), wherein a pressure P1 prevails,
• a second volume (12), wherein a pressure P2 prevails,
• a fluid passage (20) between said first (11) volume and said second (12) volume;
• and
• a spool (40), wherein the spool (40) has a hollow shape comprising a cylindrical first portion (41) having a larger diameter than a cylindrical second portion (42) of the spool (40),
• said spool (40) being movably arranged in said housing (10) between at least a first position in which a flow of fluid through said fluid passage (20) between the first (11) and second (12) volume is allowed and at least a second position in which a cylindrical outer surface of the cylindrical second portion (42) of the spool (40) blocks the passage (20), thereby preventing a flow of fluid through said fluid passage (20) between the first (11) and second (12) volume;
• wherein the cylindrical first portion (41) of the spool (40) is adapted to slidably engage with a first portion (VE1) of said valve housing 10, forming a first region of sealing engagement (RE1), and
• the cylindrical second portion (42) of the spool (40) is adapted to slidably engage with said a second portion (VE2) of said valve housing (10), forming a second region of sealing engagement (RE2);
• wherein said first region of engagement (RE1) is arranged at a first location and said second region (RE2) is arranged at a second location, and
• wherein said first (RE1) and second (RE2) regions of engagement are physically separated by a mid-portion of the spool (40) extending radially between the cylindrical first portion (41) and the cylindrical second portion (42), wherein a first side (s1a) of said mid-portion is exposed to the pressure P1 in the first volume (11) such that the pressure P1 is enabled to act on the mid-portion to force the spool (40) towards the first position.