A multi position sliding discharge valve 12 is located near {HEAD ~ the outlet} of {TAIL ~ drain line} 11, valve 12 having a throttle passage 13 through which flow is constrained by a throttle aperture, and a free passageway 14 through which flow is unconstrained 
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A multi position sliding discharge valve 12 is located near { HEAD ~ the outlet } of { TAIL ~ drain line } 11 , valve 12 having a throttle passage 13 through which flow is constrained by a throttle aperture , and a free passageway 14 through which flow is unconstrained
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH