A valve includes a first plate (10) having a first through hole (100), a second plate (20) having a second through hole (210) that does not face the first through hole (100), a valve chamber (55) formed by being surrounded by the first plate (10) and the second plate (20), and a valve body (30) disposed in the valve chamber (55) and having a third through hole (300) that does not face the first through hole (100) and that faces the second through hole (200), the valve body (30) being movable up and down between the first plate (10) and the second plate (20). In addition, a second opening area of the second through hole (210) is smaller than a third opening area of the third through hole (300), and the second through hole (210) is located in the third through hole (300) when viewed from a front.

The invention relates to a non-return valve with a valve sleeve, comprising a valve seat and a flow opening and a sealing body moveable in the valve sleeve, comprising a bulged sealing face, wherein the bulged sealing face is arranged at a head end of the sealing body and the non-return valve comprises guiding means for the axial guidance of the sealing body in the valve sleeve, so that the sealing face always faces the valve seat, and a locking element is inserted into the valve sleeve through the flow opening and is fixed therein, so that the locking element restricts the movement of the sealing body in the valve sleeve.

A valve includes a first plate (10) having a first through hole (100), a second plate (20) having a second through hole (210) that does not face the first through hole (100), a valve chamber (55) formed by being surrounded by the first plate (10) and the second plate (20), and a valve body (30) disposed in the valve chamber (55) and having a third through hole (300) that does not face the first through hole (100) and that faces the second through hole (200), the valve body (30) being movable up and down between the first plate (10) and the second plate (20). In addition, a second opening area of the second through hole (210) is smaller than a third opening area of the third through hole (300), and the second through hole (210) is located in the third through hole (300) when viewed from a front.

The present invention relates to a check valve, and to a device having a check valve, and to a method of cleaning a check valve. In order to provide a check valve or a device having a check valve or a method of cleaning a check valve, in which sufficient cleaning of the non-flow-facing regions of the valve closing body is also ensured, it is proposed according to the invention that an element reducing the flow cross-section is provided in a region of the opening stop in addition to the opening stop so that, when the valve closing body is in the open position and the fluid flows through the check valve counter to the blocking direction, a non-flow-facing region of the surface of the valve closing body has at least an average wall shear stress of 50% compared to an average wall shear stress of a flow-facing region of the surface of the valve closing body.