Pneumatic valve with actuating button

The pneumatic valve (1) comprises a valve structure (3) whose position is manually adjustable by an actuating knob (8). The operating knob is formed of a base structure (18) and a cover structure (19). The base structure is provided with radially elastically deformable catch or stop element (24) which engages with a radial recess (9) of valve structure. The cover is provided with a fuse element (36) with which an additional locking or securing connection between operating knob and valve structure. An independent claim is included for pneumatic valve assembly.