Flowmeter

A flowmeter for measuring the flow rate of a fluid, comprising in combination:

• a body portion including a fluid inlet and a fluid outlet;
• a fluid path extending between said fluid inlet and said fluid outlet;
• a core tube disposed vertically within said body portion defining a recessed groove means extending along said core tube;
• first piston means movably disposed within said core tube;
• said first piston means being disposed adjacent to said recessed groove means;
• said recessed groove means and said first piston means defining therebetween a cross-sectional area of said fluid path;
• said cross-sectional area of said fluid path being variable dependent upon the longitudinal disposition of said first piston means relative to said recessed groove means;
• a cover tube disposed adjacent said body portion and in fluid communication with said fluid path;
• a second piston means movably disposed within said cover tube;
• means connecting said second piston means to move in unison with said first piston means;
• said second piston means being immersed in static fluid in said cover tube enabling said static fluid to be disposed on a first and a second side of said second piston means;
• aperture means in said second piston means for enabling controlled fluid flow through said aperture means upon movement of said first piston means for damping the movement thereof;
• and
• an indicator means cooperating with said second piston means for indicating the position thereof relative to said cover tube to indicate the fluid flow rate between said fluid inlet and said fluid outlet.