Metering valve for fluids and gases into fluid - esp dissolved chemicals into water for use or drinking

摘要

An apparatus for injecting metered quantities of fluids or gases into a streaming fluid, esp. dissolved chemicals into water for drinking or other purposes, consists of a spring-loaded baffle producing in the main fluid line a positive or a negative pressure gradient; a branch line taking a part of the main flow, and a vessel connected to the branch line by way of a metered flow line along which the metered additive is drawn by the action of the pressure gradient. The baffle is as is usual, linked to an adjustable needle valve which regulates the open section of the branch line. this is aligned coaxially with the main flow line and has a restriction into which the metered flow line opens. The needle valve has exactly the same conical form as ther outlet of the branch line acting as a diffuser, into which the valve needle projects. The baffle fits with its tapering bore on the outer contour of the diffuser and is displaced axially along its surface. Even with the smallest amounts of the additives, there is a constant interedependance of the metered quantity and the throughout volume which are directly proportional to each other.