Geometrical influence on non-flow-facing closing-body regions

A method of cleaning a check valve (10) arranged in a device (1), with the steps of:

• a. providing the device (1) with the check valve (10), wherein the check valve (10) comprises a valve housing (11) having an inlet (12) and an outlet (13) for the fluid, a valve seat (14) having a sealing surface (14a) and an opening stop (15) opposite the valve seat (14), wherein a valve closing body (16) movable relative to the valve housing (11) and having a surface is arranged in an interior space (18) of the valve housing (11) between the valve seat (14) and the opening stop (15), wherein the valve closing body (16) can reciprocate relative to the valve housing (11) between a closed position, in which the valve closing body (16) is engaged with the sealing surface (14a) of the valve seat (14), and an open position, in which the valve closing body (16) is engaged with the opening stop (15), wherein the valve closing body (16) seals the check valve (10) when fluid flows through the check valve (10) in a blocking direction (100) in that the valve closing body (16) sealingly engages with the sealing surface (14a) of the valve seat (14), wherein an element (17) reducing the flow cross-section is provided in a region of the opening stop (15) in addition to the opening stop (15), wherein the interior space (18) is cylindrically formed at least in sections, wherein the valve closing body (16) is arranged in the cylindrical portion of the interior space (18) in a closed position and in an open position of the check valve, wherein the element (17) reducing the flow cross-section extends radially into the interior space (18) of the valve housing;
• b. impinging the device (1) and thus the check valve (10) with a fluid counter to the blocking direction (100) so that the valve closing body (16) engages with the opening stop (15) so that a non-flow-facing region (16a) of the surface of the valve closing body (16) experiences an average wall shear stress of at least 50% compared to an average wall shear stress of a flow-facing region (16b) of the surface of the valve closing body (16), wherein the flow-facing region (16b) is arranged upstream of the non-flow-facing region (16a) of the valve closing body (16) in a direction counter to the blocking direction (100).