A system for dispensing a liquid, the system comprising: a source of a liquid that crystallizes upon exposure to water moisture in air; and a dispenser in liquid communication with the source, the dispenser comprising: an inlet conduit for receiving the liquid from the source; an outlet conduit for dispensing the liquid, the outlet conduit terminating in an outlet opening exposed to air; and a valve between the inlet and outlet conduits (62, 72), the valve having an upstream side adjacent the inlet conduit and a downstream side adjacent the outlet conduit, wherein: the valve is moveable between an open position, in which the liquid flows through the valve, and a closed position, in which the liquid is blocked from flowing through the valve; in the open position of the valve the liquid flows from the inlet conduit and out the outlet opening of the outlet conduit; in the closed position of the valve (i) an upstream portion of the liquid is retained in the inlet conduit on the upstream side of the valve and characterized in that in the closed position of the valve (ii) a downstream portion of the liquid extending from the downstream side of the valve to the outlet opening is retained in the outlet conduit on the downstream side of the valve; and the size of the outlet opening of the outlet conduit is sufficiently small to retain the downstream portion of the liquid in the outlet conduit when the valve is in the closed position, whereby the valve is immersed in the liquid and the liquid does not drip from the outlet conduit. a source of a liquid that crystallizes upon exposure to water moisture in air; and a dispenser in liquid communication with the source, the dispenser comprising: an inlet conduit for receiving the liquid from the source; an outlet conduit for dispensing the liquid, the outlet conduit terminating in an outlet opening exposed to air; and a valve between the inlet and outlet conduits (62, 72), the valve having an upstream side adjacent the inlet conduit and a downstream side adjacent the outlet conduit, wherein: the valve is moveable between an open position, in which the liquid flows through the valve, and a closed position, in which the liquid is blocked from flowing through the valve; in the open position of the valve the liquid flows from the inlet conduit and out the outlet opening of the outlet conduit; in the closed position of the valve (i) an upstream portion of the liquid is retained in the inlet conduit on the upstream side of the valve and characterized in that in the closed position of the valve (ii) a downstream portion of the liquid extending from the downstream side of the valve to the outlet opening is retained in the outlet conduit on the downstream side of the valve; and the size of the outlet opening of the outlet conduit is sufficiently small to retain the downstream portion of the liquid in the outlet conduit when the valve is in the closed position, whereby the valve is immersed in the liquid and the liquid does not drip from the outlet conduit. an inlet conduit for receiving the liquid from the source; an outlet conduit for dispensing the liquid, the outlet conduit terminating in an outlet opening exposed to air; and a valve between the inlet and outlet conduits (62, 72), the valve having an upstream side adjacent the inlet conduit and a downstream side adjacent the outlet conduit, wherein: the valve is moveable between an open position, in which the liquid flows through the valve, and a closed position, in which the liquid is blocked from flowing through the valve; in the open position of the valve the liquid flows from the inlet conduit and out the outlet opening of the outlet conduit; in the closed position of the valve (i) an upstream portion of the liquid is retained in the inlet conduit on the upstream side of the valve and characterized in that in the closed position of the valve (ii) a downstream portion of the liquid extending from the downstream side of the valve to the outlet opening is retained in the outlet conduit on the downstream side of the valve; and the size of the outlet opening of the outlet conduit is sufficiently small to retain the downstream portion of the liquid in the outlet conduit when the valve is in the closed position, whereby the valve is immersed in the liquid and the liquid does not drip from the outlet conduit. the valve is moveable between an open position, in which the liquid flows through the valve, and a closed position, in which the liquid is blocked from flowing through the valve; in the open position of the valve the liquid flows from the inlet conduit and out the outlet opening of the outlet conduit; in the closed position of the valve (i) an upstream portion of the liquid is retained in the inlet conduit on the upstream side of the valve and characterized in that in the closed position of the valve (ii) a downstream portion of the liquid extending from the downstream side of the valve to the outlet opening is retained in the outlet conduit on the downstream side of the valve; and the size of the outlet opening of the outlet conduit is sufficiently small to retain the downstream portion of the liquid in the outlet conduit when the valve is in the closed position, whereby the valve is immersed in the liquid and the liquid does not drip from the outlet conduit.