Trigger sprayer for upright or inverted dispensing without leakage

A trigger sprayer dispenser having a capacity to operate upright or inverted without leaking comprising a by pass chamber having an upper portion and lower portion when the sprayer is in an upright position which comprises;

• (i) a sprayer vent orifice in the upper portion of the chamber in communication with a sprayer vent, (ii) a flow check means which will freely move with gravity from the lower portion of the chamber when the dispenser is in an upright position to the upper portion of the chamber when the dispenser is in an inverted position, (iii) a by pass orifice in communication with the dip tube at the lower portion of the by pass chamber and (iv) a dispenser by pass orifice in communication with the dispenser and the by pass chamber, in the lower portion of the chamber just above the flow check means when the dispenser is in the upright position, wherein said flow check means seals against said sprayer vent orifice when said trigger sprayer dispenser is inverted to prevent leakage of fluid through the sprayer vent.