{HEAD ~ A multi position sliding discharge valve} 12 is located near 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 
{ HEAD ~ A multi position sliding discharge valve } 12 is located near 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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