Substance Injecting Apparatuses and Methods for Using Same

US 20090266840 A1

A chemical injection system, comprising: a drive mechanism; a housing removably attached to the drive mechanism; at least one chemical inlet located on the housing; and, a valve spool located within the housing and provided with at least one chemical pass-through port, wherein the drive mechanism rotates the valve spool to align the chemical pass-through port with the chemical inlet.