Zero dead volume variable restrictor

摘要

A variable restrictor for controlling flow rate including a ferrule formed of a yieldable material and having an opening at one end cooperating with the carrier line delivering fluid thereto. A passageway in the ferrule communicating with the carrier line terminates at the opposite end of the ferrule which is provided with a conical-shaped end portion cooperating with a recess of a conforming taper provided in a member having a passageway communicating with the utilization device receiving the fluid. The flow rate is regulated by controlling the position of the ferrule relative to the cooperating recess which controls the amount of compression exerted upon the forward end of the ferrule and hence the amount of constriction of the passageway extending therethrough. The variable restrictor assembly is provided with first external adjustment means for regulating flow rate and internal adjustment means for controlling the force exerted by a yieldable holding collet upon the carrier line to maintain the carrier line in place even in the presence of high operating pressures, the internal and external adjustment devices being capable of adjustment totally independently of one another.