Abstract: A valve adapted to control liquid pressure by sliding within a valve housing a bottomed tubular valve closure member having a porous peripheral wall. The pores are subjected to reverse flush by moving the valve closure member to a closed position and also by closing an open end of the valve closure member. The valve housing includes a passage for discharging the liquid from the valve at times of the reverse flush.

Abstract: A shipboard system that provides safe storage and complete quality control of aviation fuels from acceptance of the fuel at shipside to delivery of clean, dry fuel at a shipborne aircraft includes a storage tank disposed in a closed chamber defined by a cofferdam. The tank is mounted in the chamber to provide an airspace around all sides which is vented to the atmosphere and maintains any concentration of fuel vapor in the chamber below a predetermined lean limit. Fire protection apparatus of the system is actuated by a rate of temperature rise detector and releases an agent that floods the chamber to terminate the combustion cycle in the event of a fire. Conduit runs include filters to remove contaminants when fuel is pumped through and also include a closed-circuit filtered conduit through which the fuel is frequently recirculated to control deterioration of the system and degradation of the fuel caused by long term storage and intermittent use of the system.

Abstract: A fluid operated valve device which effects a time delay in the shifting of a main valve spool. Pressurized pilot fluid is metered at a controlled rate through an air filter and a spiral groove which is restricted in size to delay the pressure build up of the fluid. When the pressure builds up sufficiently, a timer piston is shifted to break its seal with the main valve spool so that fluid can pass through the piston into a pressure chamber. The fluid pressure in the chamber shifts the main valve spool to control application of fluid to the load. When the pilot pressure is relieved, fluid flows at a high speed along a return path that passes the base of the air filter to create a suction effect which extracts dirt from the filter and purges it from the system. The pressure reduction allows springs to return the main valve spool and the timer piston into sealing position.

Abstract: Multiple path means for a fluid flow control device is shown in connection with a typical spool type servo valve. The multiple path means consists of a stack of washer-like elements or disks which cooperate to define a number of finely divided flow paths across the stack in which flow is forced through a series of alternating chambers and orifices with measured pressure drops across the orifices. Since many servo valves have comparatively short travel and since both control and wear problems tend to be most serious near null, it is desirable to minimize abrupt step flow gains around null.In the present disclosure individual disks, at least at the ends of the stack, are made comparatively thin such that the thickness of two or more disks may be required to provide a normal opening width into the stack.

Abstract: Apparatus for commingling liquid chemicals includes a mixing tank having a drain valve and a liquid container impaling head for piercing a container impressed thereon so that the container's liquid chemical contents will flow into the tank. A pump is operatively connected to the tank for transporting liquid such as water from an external supply into the tank. The pump is also operable for continuously recirculating liquid from the tank and back thereinto so as to commingle the liquid from the supply and the container. The pump's inlet is also connected to a second liquid supply so that liquid from a barrel or drum may be withdrawn therefrom and mixed in the tank. An extendible-contractible member is slidably arranged within a conduit to permit the contents of the barrel or drum to be substantially evacuated.

Abstract: This invention discloses a self-purging injection valve comprising at least one supply port, at least one purging waste port, an injection port and an injection port barrel, the injection port barrel projecting from the injection port through the valve in communication with said supply port and purging waste port, and a valve stem having an internal passage and being adapted to slide within the injection port barrel between a purging position and an injection position, to seal the injection port, to block the direct flow of materials within the injection port barrel external to the valve stem between the supply port and the purging waste port, but to otherwise permit the flow of purging fluids from the supply port along the internal passage and about the valve stem within the injection port barrel to the purging waste port when said valve stem is in the purging position and to open the injection port and to permit the flow of materials from the supply port within and without the valve stem to the injection po

Abstract: A shaft seal for a check valve having a shaft rotatably disposed within a valve housing. The shaft seal is disposed within a recess defined within the interior of the valve housing between a bushing member and the shaft. Disposition of the seal within the recess permits accumulation of foreign matter precipitate to occur without deleterious clogging of the clearances between the shaft and the bushing, thus permitting free rotational movement of the shaft. A plurality of sharp-edged grooves disposed on the surface of the shaft provide a flow path for guiding the foreign matter precipitate into the recess. A flushing fluid opening is provided within the valve housing to permit introduction of a flushing fluid into the body recess.