Writing implement with shaft, tip, main magazine for writing fluid and valve

The valve (17,21,30), between the main magazine (11) and writing tip (9), prevents the writing fluid from flowing back into the main magazine when the tip is pointing upwards. A preliminary magazine (25) between the valve and tip with which it is connected has a smaller volume than the main magazine. The valve breaks the connection between the main and preliminary magazines when the writing implement's tip points downwards for writing. The valve opens the connection when the implement is in an in-between position in which the tip points downwards. The valve may consist of a freely movable ball (30) and a housing (17,21) with two valve seatings (31,33) matching the balls.