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A safety liquid level sight gauge with a transparent sight tube coaxially disposed between mounting blocks and concentrically within a transparent shield tube which is protected by a metal sleeve with a sliding inspection window for observing the liquid level therein. The gauge includes a sight tube

A safety liquid level sight gauge with a transparent sight tube coaxially disposed between mounting blocks and concentrically within a transparent shield tube which is protected by a metal sleeve with a sliding inspection window for observing the liquid level therein. The gauge includes a sight tube breakage shut off system, and a leak shut off system. The breakage shut off system includes the transparent sight tube coaxially aligned between a pair of check valves within each mounting block. A check valve push rod is concentrically disposed and supported within the bore of the sight tube and urges both check valves to an open position allowing liquid to enter the bore of the sight tube. When the push rod collapses, such as when the sight tube is either cracked or broken, the check valve move to a closed position. The leak shut off system allows the check valves to move to a closed position when a pressure change occurs in the interstices formed between the transparent sight tube and the shield tube, the interstice is in communication with a diaphragm positioned on one end of a check valve activation plunger. The plunger is positioned between one end of the push rod and one check valve and moves perpendicularly to the push rod with a normal position that allows the push rod movement to be transferred to the check valve and a leak shut off position that allows the check valves to move to a closed position. A pressure change within the interstices influences the diaphragm to move the plunger to the leak shut off position closing the check valves.

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[ What is claimed is:] [10.]10. A safety liquid level sight gauge, comprising:a) a pair of check valves with check valve pistons disposed within mounting blocks, a transparent sight tube with each end sealingly mounted to each mounting block and with a longitudinal interior bore coaxially aligned wi

[ What is claimed is:] [10.]10. A safety liquid level sight gauge, comprising:a) a pair of check valves with check valve pistons disposed within mounting blocks, a transparent sight tube with each 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) a shield tube concentrically disposed around the sight tube providing protection to the sight tube, an interstice formed between an outer surface of the sight tube and inner surface of the shield tube for collecting liquid which may leak from a broken or leaking sight tube,c) the mounting blocks further comprise; extended flanged portions with slotted bolt apertures for receiving assembly bolt:, that extend longitudinally between the mounting blocks and secure the transparent sight tube and shield tube between the mounting blocks, a sight tube receiving bore on each mounting block with seals positioned therein for sealingly receiving the sight tube, a shield tube receiving shoulder area with seals positioned thereon for sealingly receiving the shield tube,d) a push rod concentrically disposed within the longitudinal bore of the transparent sight tube and between each check valve piston with a 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,e) a flanged attachment nipple attached to each mounting block with liquid passageways extending into the mounting block liquid passageways, andf) floatable liquid indicators positioned in the interstice between the sight tube and outer shield tube to visually determine the presence of liquid therein.