Abstract: A valve comprising a valve body having a chamber therein, a knife-edged valve seat in the chamber, and a knife edge in the chamber substantially circumscribing the valve seat. First and second passages are provided in the valve body leading to the chamber with the first passage terminating in a port substantially at the valve seat. A valve member is adapted to engage the valve seat in a first position to block flow through the port and electromagnetic means is energizable to move the valve member off of the valve seat. The valve is constructed and arranged so that the movement of the valve member off of the valve seat is carried out with mechanical advantage.

Abstract: The apparatus and method provides the ability to selectively treat a producing zone in a well and to gravel pack an annulus in the well casing outside a screen type liner pipe. A tubing string extending from the surface of the well bore is connected to a packer by a crossover valve. Flow down the tubing string is directed to an annulus below the packer, then inwardly through the screen type liner, then upward through the crossover into the annulus above the packer and then to the earth's surface. Communication from the crossover to the annulus above the packer may be selectively closed to permit a treating pressure to be exerted down the tubing to force a treating fluid into the producing zone. The treating pressure is isolated from the casing above the packer to protect the casing above the packer.

Abstract: The interior of the bellows is sealed at atmospheric pressure so the pressure on the outside of the bellows is resisted by the atmospheric pressure within the bellows as well as by the spring. When the pressure on the outside of the bellows (which is evaporator pressure in a refrigeration system) exceeds a predetermined amount, the bellows tends to collapse and the head of the bellows pulls away from the actuating pin and allows the spring acting on the pilot valve to open the pilot valve whereupon the pressure to the right of the head of the piston is reduced, allowing the piston to move to the right against the return spring force and thus open the outlet by moving the end of the piston wall past the slot in the stationary sleeve. When the pressure falls below the desired amount, the bellows expands and moves the head of the bellows against the actuating pin to close the pilot valve.

Abstract: In a combined starting and quick shut-off mechanism, for steam and gas turbines, having a valve controlled by pressure medium by means of an auxiliary valve the valve has a secondary control piston and a counterpressure closure upon opening as well as an adjustable damping which is adjustable by means of a flow cascade from the inlet side of the valve to an outlet chamber, controlled by the auxiliary valve, at the end of the valve spindle, from the inlet side of the valve to the pressure chamber of the valve piston here exists, via a radial piston chamber, stepped in its outer diameter, of the secondary control piston a further flow passage can be provided in the interior of the valve piston, which passage can be shut-off at the step of the radial piston chamber by means of an annularly projecting control collar of the secondary control piston in the open position thereof.

Abstract: A valve, such as a butterfly valve having an offset closure vane and a thru shaft for operating the vane in the flow passage of the body, has all exposed and/or potentially vulnerable metal surfaces encapsulated in a corrosion resistant polymeric plastic coating. By extending the coating uninterrupted from the flow passage through the shaft bore and sizing the bore coating to within controlled tolerances, overall corrosion protection of the valve is substantially enhanced while enabling the coating per se to function as a bearing surface for the operator shaft.

Abstract: The present invention relates to automatic control devices generally for the purpose, in the terminal equipment of an air-conditioning system which blows conditioned air, flowing thereinto through the duct from the central air conditioner, out into the room, of keeping the rate of flow at a certain fixed level. More specifically, the present invention relates to a new and improved type of automatic control device which is worked in a stabilized condition at as low wind pressure as possible and which is capable of blowing air out always at a certain prefixed rate of flow irrespective of fluctuations of the pressure inside the duct.

Abstract: An amplifying valve having an axially slidable valve spool to normally communicate a service port with a reservoir port, but which is movable to an operative position by a diaphragm type actuator activatable by air at substantially low but different selected pressures at the command of a pilot valve. In its operative position, the spool communicates the service port with a supply port for oil at high pressure. The pressure of oil at the service port is translated into a force on the spool to counteract that which is imposed thereon by the diaphragm actuator, so that service port pressure will always be substantially greater than but proportional to air pressure on the diaphragm.

Abstract: A hydraulic position servo system includes a primary control valve moved by a mechanical input which embodies a pintle laterally shiftable in a cylinder to differentially throttle two orifices to establish a variable control pressure.

Abstract: An elongated base is positioned longitudinally in the direction of the wind and has first and second endless carriers operable longitudinally thereof. A plurality of vanes are operably connected to said carriers such that they are disposed upright for surface engagement by the wind while moving from the rearward end of the base to the forward end and are disposed edgewise to the wind for returning, thus providing a driving force for an output from a shaft of one of the carriers. A plurality of side baffles are provided at a rearwardly inclined angle to direct wind into the vanes from the sides.

Abstract: A priming valve for a liquid fuel supply system is arranged in parallel with a fuel metering device and includes a shuttle control element which opens the priming valve during movement, the priming valve being shut at opposite ends of movement of the shuttle. The shuttle is moved by an operating pressure derived from the priming valve inlet via a restrictor and applied to respective ends of the shuttle by a change-over control valve which is operated to deliver a priming charge of fuel.

Abstract: A sewer pipe valve section comprising a removable one-way check valve and a separate removable screen is provided to be interposed between the building sewer drain system and that of the city. A linkage retains the screen in a normally raised inoperative position when the one-way check valve is in a lowered operative position and permits the screen to be lowered into operative position when the check valve is raised and removed for cleaning the pipe.

Abstract: A poppet type change-over valve assembly suitable for switching a fluid flow direction and capable of dealing with a large fluid flow with a small valve displacement and small valve operating force. The valve assembly characteristically comprises an annular float valve which is loosely mounted around a main valve body and has parallel or concentric outer and inner sealing edges for engagement with conical valve seats which are formed on the main valve body and an inner wall surface of the valve casing. The annular float valve is adapted to be tightly held between the conical valve seats of the main valve body and the valve casing by cooperation of the main valve body and a fluid pressure prevailing in the valve chamber when the valve is switched to a desired change-over position thereby establishing a tight seal around the main valve body for connecting a fluid inlet port with a selected fluid output port of the valve.

Abstract: The disclosure relates to a means and method for treating roots about drain lines so that such roots do not plug or impede the flow of fluid through such drain lines, the means comprising a male fitting adpated for disposition in a female drain line cleanout structure and a chemicals container is suspended from the male fitting and adapted to hold crystalline or other suitable dissolvable chemicals such as copper sulphate or the like, and water inlet means is adapted to introduce water through the male fitting and into the chemicals container so that the water will flow through the crystals and overflow from an elevated outlet in the side of the container above an area into which water is introduced into the chemicals container; a vent means provides communication of the atmosphere with the interior of the water inlet tube and a connection means is provided for introducing water into the inlet tube at a level below the atmospheric vent.

Abstract: An alignment control apparatus is described for maintaining the pipe sections of center pivot irrigation equipment in substantial linear alignment. The apparatus includes a proximity switch mounted in a water-sealable enclosure adjacent one wall and an exterior proximity element mounted on a lever for movement in response to the articulation of the joint interconnecting adjacent pipe sections. The proximity switch when operated energizes a solid state contactor which in turn energizes an electrical drive motor to propel a pipe section.

Abstract: System and method for automatically closing flow control valves and/or actuating an alarm in the event of a leak or break in a liquid pipeline. The occurrence of a leak or break is determined first by detecting the negative pressure wave which accompanies the leak or break and then by monitoring the rate of static pressure drop on the downstream side of the valve. False alarms and undesired valve closing in response to normal disturbances in the line are avoided by distinguishing between negative pressure waves originating on the upstream and downstream sides of the valve and responding only to the negative waves of downstream origin. Additional protection is provided by continuously monitoring the static pressure on the upstream side of the valve and closing the valve and/or actuating the alarm in the event that pressure falls and remains below a predetermined level.

Abstract: An inflation valve comprising an inlet; an inlet valve seat; an inlet valve member having an input face, part of which is engageable with the inlet valve seat, and an output face; a restricted passageway from a first space on the input face side of the inlet valve member to a second space on the output face side of the inlet valve member; an outlet valve seat; an outlet valve member having a first face engageable with the outlet valve seat and capable of being exposed directly or indirectly to pressure in the first or said second space and a second face exposed to exhaust pressure; and a mechanical connection between the two valve members; the mechanical connection and the relationship between the surface areas of the faces being such that when the pressure differential between the first and second spaces is above a given valve the inlet valve is held open and the outlet valve is held closed, but when the pressure differential falls below the given value the outlet valve is opened and the inlet valve is close

Abstract: A valve assembly having a plurality of coaxial disposed bores, a central one thereof being slightly enlarged in diameter and accommodating a plurality of ring inserts for cooperation with a number of thin disc valve members each carrying an O-ring seal in a rectangular peripheral groove. The valve assembly includes at least two ports communicating with the enlarged interior bore on opposite sides of the annular ring insert, and at least one axial aperture extends through the side walls of the groove of the disc valves to enable release of pressure otherwise existing under the O-ring seal.

Abstract: A valve assembly having a plurality of coaxial disposed bores, a central one thereof being slightly enlarged in diameter and accommodating a plurality of ring inserts for cooperation with a number of thin disc valve members each carrying an O-ring seal in a rectangular peripheral groove. The valve assembly includes at least two ports communicating with the enlarged interior bore on opposite sides of the annular ring insert, and at least one axial aperture extends through the side walls of the groove of the disc valves to enable release of pressure otherwise existing under the O-ring seal.

Abstract: The invention is an automatic flow control valve. The rolling cluster of a olamite is biased by the constant force due to the vertical component of gravity on the mass of the rolling cluster. The band of the rolling cluster progressively covers or exposes a porous passage which is integral with one of the rolling planes of the rollamite. Fluid flows through the porous passage and past the rollamite band.The rolamite valve of this invention may be selectively modified to become, alternately, a remotely operated fluidic control valve, an automatic self-regulating volumetric flow control valve, an automatic self-regulating flow control valve for maintaining a constant output pressure, a vapor trap valve, and an automatic self-regulating flow control valve for maintaining a constant input pressure.

Abstract: A two piece check valve assembly comprising a retainer and a valve assembled thereto, the assembly having primary usage in hydraulic and pneumatic systems operating at a low differential pressure of fractions of ounces to over a hundred pounds per square inch. The check valve assembly comprises a retainer and a valve including a dome-shaped element and is adapted for use in a tubular member wherein the retainer grips the inner face of the tubular wall to position the valve assembly and the dome-shaped element fits against the inner wall of the tubular member. Pressure within the dome element causes it to expand and snugly engage the inner wall of the tubular member to cut off flow.