the second fully closed position shown in fig4 right needle mating portion 409 is in contact with needle casing right mating portion 410 for ease of assembly left needle portion 411 and right needle portion 412 are manufactured separately and are then joined together at junction 413 to form the completed needle assembly 401 see fig1 it is preferred that the dampening fluid be a liquid because liquids are substantially non compressible with a liquid as the dampening fluid every movement of core sections 305 in left half section 101 of flow control device 100 will cause a reversed but otherwise mirror image movement of core sections 305 in right half section 102 fig7 depicts the electronic control components which comprise control assembly 501 control wires 502 from winding sections 304 are grouped together for left half section 101 and right half section 102 and are routed to processor 504 flow sensor 503 can be any type of conventional sensor which detects the rate of flow just downstream or upstream of needle assembly 401 although in the embodiment depicted sensor 503 is located on a section of pipe joined to flow control device 100 one could also locate sensor 503 on flow control device 100 itself control assembly 501 is a closed loop feedback system the operator will enter the desired flow rate into input device 505 input device 505 will.