Abstract: An improved brake fluid reservoir is disclosed. The reservoir is made from polymethylpentene and includes 10-20% by weight glass fibers as an opacifying agent. A translucent reservoir is obtained which has the highly desirable feature of visibility of the fluid level in the reservoir without providing a clear view of the fluid.

Abstract: A warning device for indicating a reduction of breathing gas supply pressure in an air breathing conduit includes a warning device member disposed in the breathing conduit which has a connection to the gas supply and is movable in response to a drop in the air supply pressure beyond the predetermined amount into at least a partially blocking position so as to increase the flow resistance through the breathing conduit so that the patient using the device is warned by the condition. The device includes a correction element connected to the conduit which moves the warning member in a direction away from the blocking position so that the warning cycle is again initiated.

Abstract: A safety device for a pressure vessel having an opening therein in which is positioned an upstanding base secured around the vessel opening with a frangible diaphragm covering the opening. A protective cap covers the base with the frangible diaphragm and has a central aperture therein covered by a transparent material providing continuous visibility of the frangible diaphragm. The protective cap has an internal annular seat to retain the frangible diaphragm in place and spaced apart fasteners maintain the cap fixedly connected to the base.

Abstract: A gas venting mechanism includes a valve chamber that is at least partially filled with a liquid. At the top of the chamber, an outlet valve allows the gas to escape but retains the liquid. Air is admitted to the chamber through an inlet valve that prevents backflow of the liquid into a passage by which the gas is supplied. The chamber is transparent so that the venting of gas can be verified by observation. A piston that reduces the effective volume of the chamber facilitates testing of the chamber for leakage of the liquid. The venting mechanism can be advantageously combined with a degasser in an aircraft hydraulic system.

Abstract: A device for constituting in the wall of a pipe an optical pick-up window which may be scavenged by a protective fluid. A chamber is provided with an inlet for said fluid and an outlet for said fluid, said chamber passing through said wall and opening into said pipe through an open end, the opening of which constitutes said outlet, and a tube introduced into the chamber so as to constitute in the chamber about the tube an annular conduit starting near the said inlet of the chamber and leading towards said outlet, one end of the tube being provided with said window and being placed in the chamber opposite said outlet, the other end of the tube opening outside the chamber, wherein the distance between the window and the outlet is sufficiently short for the flow of protective fluid in front of the window to be a sheet of fluid.

Abstract: A liquid level indicator device for providing a visual indication of the level of liquid within a movably mounted tank, disclosed as a dishwasher door mounted rinse aid liquid dispenser tank, in which the dispenser tank is alternately positioned in either the vertical or horizontal position by the opening and closing of the door. The liquid level indicator includes a tank wall mounted indicator housing defining a viewing chamber into which is passed a small quantity of liquid when the tank is in the vertical or door closed position if the level is above a predetermined level and a portion of which liquid is retained within the viewing chamber as the tank moves to the door open position to enable viewing of the liquid through a sight window provided.

Abstract: A control valve structure and combined visual indicator for controlling fluid and visually indicating the operating condition of a portion of a fluid system. The control valve has a slide valve mounted in a housing and biased toward a retracted position with one end portion thereof extending from the housing. The extended end portion of the slide valve has a knob adapted to be manually gripped for moving of the slide valve outwardly for setting same. A visual indicator is mounted on the knob. A port in the housing communicates with the slide valve to permit the application of fluid pressure to the slide valve to move same outwardly. The visual indicator has a visually observable indicator member movable between two positions for indicating the presence of either of two associated conditions in a system containing the control valve.

Abstract: A master cylinder reservoir molded of glass fiber filled nylon. An integrally molded window in a side wall is thinner than the reservoir walls and has a lower concentration of fibers so that it is sufficiently translucent to permit visual determination of the level of hydraulic brake fluid in the reservoir by observation through the window. The method of making the reservoir by molding, in which the flow of fibers into the window section is restricted to reduce the fiber concentration in the window and make it more translucent, is also disclosed.