Patent ID: 9657847
Date: 2017-05-23
CPC Classifications: F16K

Claim:
1. A pressure relief valve for pressure equalization between an essentially closed space and a surrounding atmosphere, said pressure relief valve includes a valve housing comprising: a wall defining a flow passage with an upwardly oriented outflow passage, a valve body arranged to cooperate with a valve seat arranged in said outflow passage, said valve body having an outer surface geometry configured for collecting a flow of gas that flows through said outflow passage and around said valve body to form an upwardly oriented jet, a stem configured for axial guidance of said valve body in and out of said valve seat, a damper arranged to dampen axial movement of said valve body wherein said damper constitutes a bellows damper arranged to encircle said stem and said bellows damper is arranged to dampen the movement of said valve body by applying a dampening force to said valve body via said stem when said pressure relief valve is open, wherein said bellows damper is arranged between bellows contact faces, configured such that, when said pressure relief valve is closed, no force is applied to said valve body via said stem from said bellows damper.