Over filling interdiction, vent and roll over valve

An over filling interdiction, vapor venting and roll over multi-function valve 10 comprising:

• a housing 12 defining a confined space 18 formed with at least one inlet 20 to said confined space 18, a fluid outlet port 22 at a top end of said confined space 18, and a valve seating 24 bounding said outlet port 22;
• a valve assembly 30 located within the confined space 18 and comprising a first stage member 32 and a second stage member 34, both being substantially coaxially displaceable within the housing 12;
• said first stage member 32 having at a bottom end thereof a substantially elongated slit-like inlet aperture 40, and at a top end thereof an outlet aperture 36 being in flow communication with said inlet aperture 40, where said first stage member 32 is axially displaceable between a first position in which the outlet aperture 36 progressively sealingly engages the outlet port 22 of the housing 12, and a second position in which it is disengaged therefrom;
• said second stage member 34 being a float fitted with a flexible closure membrane strip 66 anchored at one end thereof to a top wall 62 of said float member, said closure membrane strip 66 facing said inlet aperture 40 of the first stage member 30, the second stage member 34 being displaceable between a first position in which the closure membrane strip 66 sealingly engages said inlet aperture 40, and a second position in which it is progressively disengaged therefrom;
• and
• at least one anchoring member extending between the first stage member 32 and the second stage member 34, said anchoring member permitting a limited freedom of relative movement therebetween, wherein displacement of the second stage member 34 into its second position entails positive displacement of the first stage member 32 into its second position.