Gas and liquid admixing system

A system for carbonating water concurrently with carbonated water being drawn from the system, comprising a carbonating tank, a water supply source connected to said tank, a gas supply source connected to said tank, and drawing means connected to said tank for dispensing carbonated water, a float member within said tank responsive to the level of liquid in the tank, a gas inlet valve connected to said gas source and mounted in a wall of said tank, mechanical connection means within said tank connecting said float member with said gas inlet valve, said valve including a needle member and an orifice member, a decrease in said liquid level providing a gravitational force on said float member, said connection means conveying said force from said float member to said needle member to bias said needle member against said orifice member increasingly with a falling level of said liquid, thereby reducing the flow rate of gas into the tank as the liquid level falls and increasing it as the liquid level rises, a flow of water being induced into the tank during a draw of liquid from the tank which increases with a reduction of liquid level in the tank and decreased gas flow into the tank, said water flow decreasing with a rising liquid level and increased gas flow rate into the tank, an equilibrium point being reached at an intermediate level of liquid in the tank, with the liquid at an intermediate point on the float member, wherein the inlet flow rates of gas and water are continuously controlled to substantially equal the outlet flow rates of gas and water contained in the departing mixture of carbonated water, thus maintaining the liquid level at a constant point in the tank and at a constant level on the float member during a draw of carbonated water at a constant rate, and maintaining a constant and even mixing of gas and water as they enter the tank with constant flow rates and under constant conditions of gas pressure in the tank, during said draw.