Patent ID: 8142174

Claim:
An air pump set comprising: an air pump that supplies pressurized air; at least two air distributors serially connected with the air pump that further distribute the pressurized air to respective air-requiring targets; and a pressure reducer, serially connected between any adjacent two of the at least two distributors, that reduces the pressure of the pressurized air to a downstream one of said any adjacent two of the at least two distributors, the pressure reducer comprising: a hollow cylinder comprising a first inlet and outlet pair and a second inlet and outlet pair; and a cylinder core being loosely fitted within the hollow cylinder, and comprising a first air channel and a second air channel, wherein the cylinder core is rotatable between a first position and a second position relative to the hollow cylinder, such that: when the cylinder core is at the first position relative to the hollow cylinder, the first air channel provides a connection between the first inlet and outlet pair, and the second air channel does not provide a connection between the second inlet and outlet pair; and such that when the cylinder core is at the second position relative to the hollow cylinder, the second air channel provides a connection between the second inlet and outlet pair, and the first air channel does not provide a connection between the first inlet and outlet pair.