Abstract: A process-liquid supply part includes: a supply tank configured to contain a process liquid; a level gauge pipe connected to the supply tank, the level gauge pipe being provided with level sensors for detecting a remaining amount of the process liquid contained in the supply tank; and a measuring part configured to measure a remaining amount of the process liquid based on signals from the level sensors provided on the level gauge pipe. Connected to the supply tank are a process-liquid supply pipe configured to drain the process liquid contained in the supply tank, and a process-liquid return pipe configured to introduce the process liquid drained through the process-liquid supply pipe to the supply tank. A connection pipe, in which an openable and closable valve is provided, disposed between the process-liquid supply pipe or the process-liquid return pipe and the level gauge pipe.

Abstract: An acoustic wave sensing device integrated with micro-channels and a method for the same are described. The present invention uses a piezoelectric substrate with a thinner portion serving as a sensing area and formed via a micromaching or chemical process. An inter-digital transducer (IDT) is located on the thinner portion to produce flexural plate waves (FPW). The micro-channels can be formed together with the thinner portion via the same manufacturing process, or integrated into the piezoelectric substrate via linkage. In the present invention, a novel manufacturing process and design are proposed for fabrication of the acoustic wave sensing devices with a good piezoelectric characteristic, a stable temperature compensation property, and a robust structure. Thereby, the techniques of flexural plate waves can be applied for liquid sensors. In this way, the drawbacks of the conventional acoustic wave sensing devices, such as poor piezoelectric properties and fragile film structures, are removed.

Abstract: An armored sight gauge assembly of the type having a sight tube that is placed between first and second spaced apart fittings to show a liquid level comprising an elongated main body positioned between and permanently connected to the first and second fittings. The main body incorporates a flanged U-shaped frame member to which there is removably affixed a transparent sight tube shield. A sight tube assembly substantially surrounded by the flanged U-shaped frame member on three sides and is insertably captured by the first and second fittings. A valve assembly and ball check shutoff is incorporated within the internal portion of each of the first and second fittings as is a misalignment union which is removably attached to each fitting.

Abstract: 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.

Abstract: A sight glass for a fluid vessel that includes a housing with facility for mounting to a fluid vessel wall, and a transparent window mounted within the housing for viewing fluid within the vessel from outside of the vessel wall. A valve mounted within the housing has a normally open position for permitting passage of fluid from within the vessel to adjacent the window, and a closed position for blocking such fluid passage. The valve includes structure responsive to one or more predetermined conditions at the sight glass for moving the valve to the closed position so as to block passage of fluid to the window, and thereby provide a visual indication of occurrence of the predetermined conditions from outside of the vessel.

Abstract: The present invention relates to a replaceable sight gauge system to monitor fluid levels in a reservoir or fluid tank. The sight gauge of the present system is mounted to the wall of a fluid tank by two bolt assemblies. The bolt assemblies, which include an entry bolt, an exit bolt, and a fastener, are designed to selectively allow fluid from the tank to flow through the bolt assembly into the sight gauge while holding the sight gauge securely against the fluid tank. The entry bolt houses a valve which opens when the exit bolt is mated with the entry bolt. When the exit bolt is disengaged from the entry bolt, the valve moves back to a closed position so that fluid cannot escape from the fluid tank. The sight gauge can easily be replaced from the disengaged exit bolt.

Abstract: A metering sight glass is provided by a body of a transparent glass-like material having its ends polished to provide opposite viewing faces, the body being provided intermediate its length with dual axially aligned transverse passages, one of which provides a metering orifice, and the other of which provides a cavitation chamber positioned adjacent the metering orifice.

Abstract: A quick shut-off device for attachment to the side of a liquid filled container to measure the amount of liquid therein. Upper and lower valves with a sight glass extending between them are provided with ball valves to allow the on-off positions of the upper and lower valves to be controlled by a 90.degree. change in position of rods connected to the ball valves. In the closed position of both valves, the interior of the sight glass and the main ball valve passageways are in alignment for easy cleaning without sight glass removal. The upper and lower valves are identical in construction so they can be readily interchanged.