Dispensing device

A dispensing device for dispensing pressurized gas from a canister of the type having a cylindrical wall and a formation at the upper end of the cylindrical wall for receiving and securing the dispensing device through an opening formed in the formation, said dispensing device comprising:

• a housing having a wall that defines a chamber, said wall of the housing being attached to the formation of the canister;
• a first valve having a valve body disposed within the chamber of the housing and an annular valve stem extending away from the valve body;
• said first valve being movable between an open position in which fluid communication between the interior of the canister and the annular stem is achieved and a closed position in which fluid communication therebetween is blocked;
• and
• means biasing the first valve to its closed position;
• a second valve disposed within the first valve, said second valve having a valve member and a valve stem extending away from the valve member, said valve stem of the second valve being disposed within the valve stem of the first valve and extending coaxially therewith, said second valve being movable between an open position in which the valve member of the second valve is moved relative to the valve stem of the first valve to allow fluid communication between the first valve and atmosphere, and a closed position;
• means biasing the second valve to its closed position,
• the arrangement being such that upon movement of the first valve to its open position and movement of the second valve to its open position, pressurized gas within the canister is exhausted from the canister to atmosphere.