Patent ID: 6234018
Filing Date: 2001-05-22
Classification: F16K,G01F

Abstract:
A safety liquid level sight gauge, comprising:a) a pair of check valve with check valve pistons disposed within mounting blocks, a transparent sight tube with check end sealingly mounted to each mounting block and with a longitudinal interior bore coaxially aligned with the check valves, liquid passage ways extending through the mounting blocks around the check valves and into the interior bore of the transparent sight tube, a spring disposed within each check valve which urges each check valve piston to a closed position blocking the liquid passage way into the interior bore of the transparent sight tube,b) push rod means concentrically disposed within the longitudinal bore of the transparent sight tube and between each check valve piston with a first length which deflects each check valve piston to an open position allowing liquid to flow through the passage ways into the interior bore of the transparent sight tube, the check valves move to a closed position when the push rod is shortened to a second length, andc) a shield tube concentrically disposed about the transparent sight tube and sealingly mounted to each mounting block.