Abstract: Apparatus for dispensing liquids includes a body in which the liquid is initially located. A one-way valve and an outlet are located on the body in reasonable proximity to each other, the outlet communicating with a conduit able to be closed by a control valve. When the body is located such that the one-way valve and the outlet are below the surface of the liquid, gravity ensures constant liquid flow through the conduit when the control valve is opened, and when air begins to pass through the one-way valve. A flow rate change measuring instrument has two metallic strips, one of which is able to move in relation to the other strip in response to flow changes, the capacitance between the strips being processed to obtain a measurement of flow rate change. The measuring apparatus may be located in the conduit of the dispensing apparatus.