Abstract: An electromagnetic valve is equipped with a signal generator which operates in dependence on the positions assumed by the internal valve mechanism and which represents a relatively small unit which is attached in various positions to the housing of the magnetic actuator mechanism of the valve. The signal generator has at least one electrical switch which is actuated mechanically by a pin which transmits the motions of the armature to the switch without any appreciable interference with the operation of the magnetic mechanism. The switch is mounted within a housing on an insert which may be located in various positions relative to the housing and may suitably be a microswitch. Thesignal generator housing is sealingly attached to a mounting bracket which, in turn, is mounted on the housing of the magnetic actuator of the valve. The passage of the actuating pin is sealed against the outside by appropriate seals.

Abstract: A housing in which a locking tube is contained is threaded into a suitable threaded opening in the valve casing with the opening communicating with the interior of the casing adjacent the seal piston; the locking tube is threaded within the housing and is engageable with the seal piston to lock the seal piston against the valve insuring positive sealing engagement; a detector push-rod is axially movable within the locking tube and is spring loaded against the seal piston; when sealing has been effected, the push-rod effects the actuation of a limit switch to initiate the operation of a signal device.

Abstract: A butterfly valve is provided with a high performance disc having a wedge-shaped leading half formed by a pair of flat surfaces converging towards a leading edge from a portion of maximum disc thickness positioned forward of the disc axis. The trailing half of the disc also has a pair of flat surfaces diverging from a portion of the disc adjacent the axis, thereby forming a wedge projecting into the leading half.

Abstract: The invention provides a control circuit for a pneumatic shift register constituted by phase cells associated with an assembly of two threshold relays, each having a supply input and a control input which inhibits the output when the pressure that it receives is not lower than a pressure threshold which is low with respect to the control threshold of the memory contained in the cell.

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 rotary valve comprising a spherical segment supported on arms extending radially from aligned stub shafts. Carried by the arms is a vane which is circular in outline and of maximum thickness along the diameter parallel to the axis of the shaft, tapering to lesser thicknesses in both directions transverse of that diameter. In addition, the vane is tilted about the maximum thickness diameter in the rotary direction opposite to valve opening movement, so that it remains exposed to the flow stream through full movement of the plug. The flow stream acting against the vane biases the plug toward closed position, cancelling the effects of the flow stream acting against the plug itself.

Abstract: A combined stem assembly and removable handle for a rotary control device such as a valve. The handle interlocks with an indexing member and is secured by a hollow nut that screws onto the stem over and enveloping the nut holding the stem assembly together.

Abstract: A valve, of the type employing a plug rotatable through substantially 90.degree. between open and closed valve positions, employs a plug which has an elongated configuration along its axis of rotation with the opposing ends of said elongated plug each exhibiting a spherical, ellipsoidal, or other curved configuration that merges smoothly into the elongated sides of the plug. The plug is provided with a passageway which is elongated in the direction of elongation of the plug and which extends through the plug in a direction transverse to the axis of rotation of the plug. The plug surface is sealed relative to the valve housing by at least one continuous seat of elongated closed loop configuration which engages the surface of the plug along a continuous noncircular line or band having a direction of elongation extending generally in the same direction as the central axis of the plug.

Abstract: An arrangement for the prevention of excess pressure in housings of shut-off valves with varying pressure loads, in which an independent chamber is provided with two facing openings. These are connected by pressure lines to pipe sockets connected to the shut-off valves. The facing openings are closed by seals which are, in turn, connected gas-tight by elastic elements. Another pressure line discharges into the chamber space located outside the elastic elements, and this pressure line is connected to the interior of the housing of the shut-off valves. The sealing elements which close the facing openings, brace each other through a spring, and the sealing elements are connected gas-tight by a bellows. A center section is located between the sealing elements. Through drill holes in the center section and in the sealing elements, the facing openings discharge into a space enclosed by the center section, the bellows and associated sealing element.

Abstract: An improvement to a priority valve which provides priority flow to a priority function, not only directly from a fluid power source, but also from an accumulator when the priority demand exceeds the output of the fluid power source. This priority flow valve also provides flow to one or more secondary functions when the priority flow requirements are satisfied or when the priority flow path is blocked.

Abstract: An annular chamber in a housing has inlets at both ends. A central segment of the changer has on its inside wall a groove tapering toward the inside and leading at its base to a centrally located output passageway. Disposed in the groove and central segment of the chamber is an annular gate ring which has a T-shaped radial cross-section. There is sufficient clearance between the ring and the walls to permit the ring to move freely a short distance axially within its confinement. Pressure from one or the other direction of the chamber causes the ring to deform itself against one or the other side of the groove so that the top part of the T-shaped radial cross-section closes off the chamber to the other side.

Abstract: A valve for controlling fluid flow is disclosed in which a fluid outlet is controlled by two separate components, one being tubular in shape and located inside the other hollow component. Both the hollow and the tubular components may either be the valve body and closing element respectively, or vice-versa. The two components are reciprocally slidable through elastic sealing rings along their common longitudinal axis, and are also rotatable about that same axis, whence the path of fluid flow may be readily controlled in a gradual manner from the fully shut position to the fully open position, depending upon the longitudinal position of a plunger element with respect to the valve body. The plunger is in a state of static balance with respect to any existing pressure or friction, as well as with respect to its own weight.

Abstract: A ball valve having improved sealing capability, which has a conventional housing, with a flow opening, and means for positioning and rotating the ball inside of the housing. There is at least one metal seal ring which is positioned and sealed inside of the housing, in a position where it is coaxial with the flow opening through the housing. It has a conical surface which includes a resilient seat ring, which faces and is spaced a selected distance from the surface of the ball. The ball has at least one circular wire ring, made of a selected diameter of wire. The ring is attached and sealed to the surface of the ball as a circular ridge in such a position that when the valve is closed the ridge will be coaxial with the seal ring and will penetrate into the surface of the resilient seat ring a selected distance in order to create sufficient internal pressure to seal against fluid pressure in the flow opening through the valve.

Abstract: An improved shuttle valve for providing control of fluid from two alternate ources to a fluid-actuated mechanism. Primary and secondary fluid sources are coupled to supply fluid to a shuttle valve for transmission to a single outlet port. A bias piston having a passage axially extending therethrough is slidably positioned to engage the shuttle and impart movement in response to fluid pressure from the primary source. A bias source is coupled to vary the pressure on the piston and thus change the net bias needed to allow fluid from the primary source to maintain the shuttle in a first position. Initially, when the shuttle is in the first position, fluid flows from the primary source to the single outlet. Subsequently, when the pressure from the primary source falls below a predetermined value, the fluid pressure from the secondary source moves the shuttle to enable fluid flow from the secondary source to the single outlet.

Abstract: A wash-house fitting including a trough which is able to be combined with a washing appliance preferably a washing machine. A pair of pipes run between the trough and the washing appliance, one of these pipes being arranged such that water, such as soapy water, initially in the washing appliance can be passed through that pipe to the trough through an aperture in the base or walls of the trough for later return to the washing appliance. The other pipe is arranged such that another liquid such as rinse water may be transferred from the washing appliance to a drainage system.

Abstract: A control valve for fluids has two relatively rotatable plates, each having ports which cooperate to control fluid flow. The plates are biased towards one another, and one of the plates is provided with lands round its ports, these lands creating a space between the plates, to which space the fluid pressure at the valve inlet is admitted. The pressure between the plates opposes the inlet pressure acting on one of the plates, and the areas of the aforesaid one plate subjected to the inlet pressure are selected so as to produced a desired force between the plates.

Abstract: A liquid metering and mixing device specifically for the metering and mixing of gasoline and oil for a two-cycle engine wherein addition of gasoline to a rotatably mounted measuring member for a gasoline tank actuates a valve means which opens for a short period of time letting a small amount of oil into the measuring member.

Abstract: In a valve for controlling fluid flow, the spindle comprises a flexible polymeric sheath, preferably PTFE, around the end of a stem, the sheath having a tubular portion suspended clear of the stem and having an oversize external ridge which is accommodated within the bore by flexing of the tubular portion, resistance to this flexing serving to bias the external ridge against the surrounding body to provide a gland seal.

Abstract: A fluid control valve includes a valve body having a passageway, a valve stem, a valve seat, a floating stem end member and a captive internally threaded insert. The valve stem has a molded-on, color-coded external thread mating with the internal thread of the color-coded insert so as to advance or retract the stem through the valve body as the stem is turned by an operating knob. The stem end member includes a pair of retaining arms which snap over a shoulder on the stem and these arms are confined within the valve body. These arms retain the stem end member on the stem while still permitting free rotation of the stem within the stem end member. As the stem advances into the valve body, the stem end member is moved into sealing contact with the valve seat, thereby blocking the continued passage of water from an inlet port to an outlet port. The valve seat also serves as a union nut mount, and is slotted for easy removal from the rear by use of a screwdriver for servicing.

Abstract: A terminal and gauge assembly which provides connections for lines to or from individual fluid pressure circuits, such as the pneumatic circuits of a pneumatically operated control system includes a duct with a removable cover. The lines run longitudinally inside the duct. A bar located on the cover outside of the duct is formed with spaced chambers. The lines are terminated at couplings which extend into the chambers and serve to fasten the bar to the cover of the duct. Gauges or test points are mounted on the bar and connect to the chambers so that the pressure or other parameter associated with each circuit may be monitored.