Patent ID: 9404588
Filing Date: 2016-08-02
CPC Classification: F16K

Claim Text:
1. A valve for use in a vacuum drainage system, comprising i) a valve body having (ii) a movable member movably secured within the interior chamber and having at least one outlet aperture that provides an individual operational open area for fluid flow from the interior chamber to the outlet, with a total operational open area defined as the sum of the individual open areas, wherein: as the movable member moves through a distance of travel expressed as x, where x ranges from x=0 at a fully closed position to x=1 at a fully open position, movement of the movable member from the closed position to the fully open position results in a linear increase in vacuum pressure provided through the valve from the vacuum source to the papermaking equipment; and a percentage of the total operational open area, expressed as y, varies non-linearly with x, such that when: