Compact dual pump

A dual pump for independently pumping two fluids includes a pump body having a first concave depression on a first side of the body. A first inlet port and a first outlet port are contained within the body, in fluid communication with the first depression. A second concave depression is on a second side of the body opposite the first depression. A second inlet port and a second outlet port are contained within the body in fluid communication with the second depression. A first diaphragm is coupled to the first side of the body and encloses the first depression to form a first inner chamber. A second diaphragm is coupled to the second side of the body and encloses the second depression to form a second inner chamber. A shell encloses the body on its first and second sides. The shell defines a first outer chamber with the first diaphragm in pressure communication with the first inner chamber. The shell also defines a second outer chamber with the second diaphragm in pressure communication with the second inner chamber. A first pressure port in the shell provides a first pressure passage to the first outer chamber. A second pressure port in the shell provides a second pressure passage to the second outer chamber. Advantages include simultaneously and independently providing two fluid pumps within a pump that is substantially the same size as a conventional single pump. Alternatively, the pump is configured to supply a continuous, non-pulse flow of a single liquid.