A dispenser for dispensing metered amounts of a viscous liquid includes a
liquid reservoir and a pump chamber having an opening in communication
with the reservoir. A pump mechanism including a pump cylinder with a
dispensing channel therethrough is configured with the pump chamber and
is movable from a rest to a pressurizing position upon actuation thereof
to pressurize liquid within the pump chamber. A dispensing orifice is
defined at one end of the dispensing cylinder. A check valve mechanism is
disposed in the opening. During shipment or storage, the pump cylinder is
locked in pressurized position. When locked in pressurized position, the
dispensing channel engages the check valve to seal the opening and also
prevent flow from the pump chamber to the dispensing channel.