Pneumatic valve assembly

The invention discloses a pneumatic valve assembly. The pneumatic valve assembly includes at least one plunger including a first plunger and a second plunger disposed in the passage in cascade and spaced apart from each other for controlling a flow of fluid through the aperture of the valve seat in response to a magnetic field moving with the armature; and a cover attached to the armature and extending around the first plunger and the second plunger, moving axially with the armature in response to a magnetic field, and holding the first plunger and the second plunger in the passage. The covercomprises a top part, a bottom part and a middle stop part, wherein the top portion is attached to the armature, the bottom portion defines a bore to receive the protrusion to allow a distal end of the protrusion to engage the valve seat to prevent fluid flow through the bore of the valve seat, and the intermediate stop portion extends at an inclined angle relative to the central axis, is locatedbetween the top portion an