Shower head flow control device

Claim 1

A shower system comprising respective hot and cold water supply conduits including manually adjustable control valves, a common water supply pipe connected to said supply conduits, whereby water may be supplied to said supply pipe at a mixture temperature in accordance with the relative settings of said control valves, a shower head, a conduit fitting connected between said common supply pipe and said shower head, said fitting having a straight longitudinal bore extending between its opposite ends, an elongated valve element slidably engaged transversely in said fitting and intersecting said bore, at least one end of said valve element projecting laterally from said fitting, said valve element being formed with an annular peripheral groove having an axial length slightly less than the diameter of said longitudinal bore, registrable at times with said longitudinal bore and being movable to selected flow-restricting positions to adjustably control the velocity of liquid flow through the fitting to the shower head and being movable at other times to a flow-blocking position relative to said bore, wherein said fitting has a reduced externally threaded lower end portion defining a peripheral shoulder, said externally threaded lower end portion being tightly threadedly engaged with the shower head and having a length providing an annular clearance space between the shower head and said peripheral shoulder, and wherein the wall of said reduced lower end portion adjacent to said shoulder is formed with a small air-aspirating passage communicating with said clearance space, whereby said clearance space and air-aspirating passage define a venturi passage to allow air to be aspirated into the water stream passing into the shower head, causing the air to mix with the water, the air-aspirating passage being located relatively close to the shower head, whereby the back pressure developed in the shower head can be readily overcome by suitably adjusting the restrictive position of the groove to provide the required velocity of the water stream.