Non-return valve, in particular for medical uses

摘要

A nonreturn valve includes a first tube connection housing and a second tube connection housing and a diaphragm disk between the first and second tube connection housings. The disk can be lifted from an annular valve seat upon an overpressure in an inlet channel and can be pressed onto the valve seat upon an overpressure in an outlet channel. The diaphragm disk has an annular bead received in mutually opposite annular grooves of the tube connection housings. The diaphragm disk is provided, radially outside the valve seat, with openings leading to an outlet chamber. The second tube connection housing lying opposite the openings is provided with recesses which communicate with the outlet channel and are separated from each other by supporting surfaces for the diaphragm disc. The recesses are connected to the outlet channel by narrow deep grooves.