Dispensing container for liquid products

Claim 1

A container for a liquid product which is to be dispensed into a flowing liquid, the container comprising; a cylinder; a piston in said cylinder; an end cap secured to the cylinder and closing one end of the cylinder, there being a line of weakening along which part of the end cap can be separated from the cylinder and the remainder of the end cap thereby to permit access to be had to the interior of the cylinder through said one end; a valve unit closing-off the other end of the cylinder; a compartment for said product bounded by said cylinder, said piston and said valve unit; a valve closure element forming part of said valve unit; a valve seat forming part of said valve unit; spring means forming part of said valve unit and urging said valve closure element against said seat; a surface of said valve closure element which is contacted by the product in such manner that the product, when under pressure, urges said element towards said seat; and wall means for defining a passage through which a member can be inserted into said valve unit to displace said valve closure element away from said seat against the action of the spring means and permit flow of said product from said compartment through said valve unit to externally of said container.