Abstract: A method and apparatus is disclosed for controlling the pressure of reaction chamber in wafer processing equipment. The disclosed apparatus and method uses a ballast port for inserting gas into the evacuation system, thereby controlling the pressure in the reaction chamber. The disclosed apparatus and method further uses estimation curves to estimate the desired position of a controlled gate valve which is located between the reaction chamber and turbo pump. The disclosed apparatus and method further introduces process gases at higher rate than set point levels to reduce the transition time or stabilization time required when raising the pressure in the reaction chamber.

Abstract: A device for automatic dilution of chemical additives and water utilizing a single pump (20) drawing water and other chemical additives through a dilution manifold (10). The introduction of air into the system is monitored such that the system performance is not impaired. If the air leak is small corrections can be made, and if the air leak is large, the system will shut down and activate an indication or alarm to signify that some malfunction has occurred, such as a chemical supply is unconnected or empty.

Abstract: A method and apparatus is disclosed for controlling the pressure of reaction chamber in wafer processing equipment. The disclosed apparatus and method uses a ballast port for inserting gas into the evacuation system, thereby controlling the pressure in the reaction chamber. The disclosed apparatus and method further uses estimation curves to estimate the desired position of a controlled gate valve which is located between the reaction chamber and turbo pump. The disclosed apparatus and method further introduces process gases at higher rate than set point levels to reduce the transition time or stabilization time required when raising the pressure in the reaction chamber.

Abstract: A regulator for maintaining a constant partial vacuum in a region, such as in a piece of process equipment or a fume hood. The regulator includes a path, through which fluid passes from the region to the vacuum source, and a movably mounted piston. The piston is disposed in the path so that the piston may constrict the path at a constriction point. Fluid in the path upstream of the constriction point exerts a pressure on the frontal face of the piston that tends widen the path at the constriction point. The piston is mounted so that the weight of the piston exerts a force on the piston in a direction that tends to widen the path at the constriction point. A force is exerted on the piston, preferably by a spring under compression, in a direction that tends to narrow the path at the constriction point. A buffering gas, introduced to the area between the piston's skirt and the piston mounting structure, may be used to keep noxious fumes from backing up into the environment and/or to provide an efficient bearing.

Abstract: Automatic swimming pool cleaning systems are disclosed. The systems include an automatic swimming pool cleaner incorporating one or more curved wipers protruding from its lower surface. The wipers and flat bottom of the cleaner induce a vortex as fluid flows to its central inlet, entraining debris in the flow. A fluted throat surrounding the inlet additionally assists the interior of the base of the cleaner in retaining debris when opened for cleaning, additionally providing an improved flow path for enhanced debris pick-up. Also disclosed is a valve useful for controlling and indicating the rate of fluid flow to a cleaner. Included within the valve is a plunger attached to a spring, with the spring force opposing fluid flow through the valve. Flow sufficient to overcome the spring force compresses the spring, however, thereby moving the plunger within the tube and providing a dynamic indication of the rate of fluid flow.

Abstract: A centrifugal pump is of the type having a diffuser (1) with upstream and downstream ends (1a, 1b), a delivery body (3) fixed to the downstream end and including a delivery chamber, a suction body (2) fixed to an upstream ends (1a) of said diffuser (1) and including a suction chamber. A jacket (8) is fixed between the suction body and said delivery body, defining a space within. The pump includes a multi-functional chamber communicating with said jacket, a first auxiliary outlet communicating between said multi-functional chamber communicating and said suction chamber, a second auxiliary outlet communicating between said multi-functional chamber communicating and the external space, and outlet plugs for opening and closing the two outlets independently of one another. The pump is suitable for different pumping functions.

Abstract: A gas mixing valve has first and second inlet chambers linked to supplies of a first and second gas, and a mixing chamber having a blended gas outlet. The inlet chambers are connected to the mixing chamber via first and second control valves, each valve having a valve seat and valve member with opposing surfaces defining a flow control orifice. Each valve seat and valve member are relatively movable between a closed position in which no flow occurs and a maximum opening position to define a series of orifices of progressively increasing area corresponding to the same geometrical progression. The position of each valve member can be controlled to provide a desired mixing ratio. Each valve seat is provided in a respective piston, and the pistons are tied together to move in response to variations in pressure drop across each piston, in order to vary the orifice size to compensate for changes in flow rate without changing the mixing ratio.

Abstract: An improved mixing unit and check valve for a fluid pumping system wherein gradient proportioning is performed at high pressure are described. The mixing unit has lining means disposed on the inner surface of the chamber for preventing frictional contact between the steel of the chamber and the surface of the rotor. The lining means is formed of a polymeric material selected for frictional compatibility with the rotor, and avoids formation of undesirable particulates by friction with the rotor surface. The check valve has a poppet comprising a midsection dimensioned to provide forward and rearward surfaces against which fluid flow will exert force, a first arm extending transversely from the midsection first side toward the valve inlet, a second arm extending transversely from the midsection second side toward the valve outlet, and first and second resilient seals respectively annularly disposed about the first and second arms.

Abstract: A regulator for maintaining a constant partial vacuum in a region, such as in a piece of process equipment or a fume hood. The regulator includes a path, through which fluid passes from the region to the vacuum source, and a movably mounted piston. The piston is disposed in the path so that the piston may constrict the path at a constriction point. Fluid in the path upstream of the constriction point exerts a pressure on the frontal face of the piston that tends widen the path at the constriction point. The piston is mounted so that the weight of the piston exerts a force on the piston in a direction that tends to widen the path at the constriction point. A force is exerted on the piston, preferably by a spring under compression, in a direction that tends to narrow the path at the constriction point. A buffering gas, introduced to the area between the piston's skirt and the piston mounting structure, may be used to keep noxious fumes from backing up into the environment and/or to provide an efficient bearing.

Abstract: A linear sheath valve having a valve platform and a conforming cover. The valve platform can have inlet and outlet channels to carry liquid into and out of the valve. An elastomeric membrane is held under tension between the cover and the valve platform so as to control the flow of liquid between channels. The cover includes an expansion area on the cover surface adjacent to the membrane and between the inlet and outlet. Liquid flows through the valve when it is drawn by a vacuum. The vacuum operates on both the flow path exit, but also above the membrane, lifting it to open the flow path. Discontinuance of the vacuum allows the membrane to seal the inlet and outlet, thus again preventing any flow between them.

Abstract: The invention relates to a device for the mixing of water and steam introduced via seperate closable supply lines into a mixing vessel wherein the water-to-steam ratio can be changed and wherein the steam supply can be automatically stopped if the water pressure drops below a given value.

Abstract: A flow control weir valve and method of operating the valve is disclosed. The valve has an inlet, an outlet, a bypass inlet, a pivoting cover and a mechanism for controlling the cover in order to provide a relief flow through the valve. The cover is continuously forced to a first, closed position by one or more resilient springs or other flexible force producing mechanisms. When fluid flows within the valve, the closing force generated by the springs may be overcome by the low pressure generated within the valve, which thus allows the ambient environment to force the cover at least partially open once the fluid flow rate passes a threshold value. A step in the body of the valve can be used to interrupt the fluid flow and create a Venturi effect for further assisting the cover to open. The cover is sufficiently responsive to allow a relief flow through the bypass inlet that satisfies rapid and wide-ranging pressure variations created within a cleaning system to which the valve may be attached.

Abstract: A fluid mixing device comprises a housing provided with fluid entry ports for fluids being treated, and for treatment fluids, as well as a fluid discharge port for the discharge of treated fluids. A compound valve arrangement is positioned in the entry port, comprising one valve for adjusting the amount of treatment fluids entering the mixing device, and in series therewith a toggle valve actuated by a rod attached to the toggle valve which extends into the housing and which is actuated by the impact of fluids passing through the device. The mixing device is particularly suited to the neutralization of mine waste waters with caustic soda and for the introduction of polymer flocculents to induce the settling of solids in liquid suspension.

Abstract: Systems and methods for pressure reduction, including a first conduit with a pressure sensor, a static restriction device, and second conduit connected therebetween. Fluid is introduced through the second conduit as a function of the pressure sensed by the pressure sensor, thereby compensating for fluctuations in sensed pressures due to restriction device degradation and other factors.

Abstract: A gas mixing valve has first and second inlet chambers linked to supplies of a first and second gas, and a mixing chamber having a blended gas outlet. The inlet chambers are connected to the mixing chamber via first and second control valves, each valve having a valve seat and valve member with opposing Surfaces defining a flow control orifice. Each valve seat and valve member are relatively movable between a closed position in which no flow occurs and a maximum opening position to define a series of orifices of progressively increasing area corresponding to the same geometrical progression. The position of each valve member can be controlled to provide a desired mixing ratio. Each valve seat is provided in a respective piston, and the pistons are tied together to move in response to variations in pressure drop across each piston, in order to vary the orifice size to compensate for changes in flow rate without changing the mixing ratio.

Abstract: A hand-held vacuum pump with an attached vacuum limiter valve is disclosed. The pump includes a cylinder coupled with a handle, a piston in the cylinder coupled with another handle, along with a suitable valving assembly for allowing a vacuum to be drawn at an inlet of the pump. More particularly, there is also disclosed a vacuum limiter which can be attached to or form an integral part of the pump. The vacuum limiter includes a valve which is attached to the cylinder outlet port and which is adjustable for allowing the limit vacuum to be set.

Abstract: A device for the blending of gases or liquids having an inlet adapter, a main body, an outlet adaptor, a valve plate, and a spring arm. Air enters the inlet adaptor and passes through an air port in the main body. Fuel is supplied to a fuel port in the main body through a nipple and a passage. The fuel port and the air port share a common valve seating plane and are aligned side by side along the innermost edge of the valve seating plane. The spring arm applies a force to the valve plate which forces the valve plate towards the valve seating plane. The valve plate pivots about the innermost edge of the valve seating plane in response to the downstream demand for the blend and forms a common angle above the air and fuel ports, which results in proportionally exposed port areas. The downstream demand for the blend provides a pressure difference across the valve plate which acts against the valve plate spring to position the valve plate to a balanced position.

Abstract: A regulator for maintaining a constant partial vacuum in a region, such as in a piece of process equipment or a fume hood. The regulator includes a path, through which fluid passes from the region to the vacuum source, and a movably mounted piston having a frontal face, which is exposed to fluid in the path, and a distal face, which is exposed to a reference pressure, such as the pressure of the environment in which the equipment is located. The piston is disposed in the path so that the piston may constrict the path at a constriction point. Fluid in the path upstream of the constriction point exerts a pressure on the frontal face of the piston that tends widen the path at the constriction point. The piston is mounted so that the weight of the piston exerts a force on the piston in a direction that tends to widen the path at the constriction point. A force is exerted on the piston, preferably by a spring under compression, in a direction that tends to narrow the path at the constriction point.

Abstract: A control valve for use in a swimming pool containing an automatic pool cleaner is described. The valve comprises a main water passage having an inlet port in a cranked inlet portion and an outlet port. A valve chamber extends from the main passage. It has a relief valve and an outlet through its side wall. A by-pass passage connects the outlet to the main water passage. A valve member sensitive to the pressure in the by-pass passage is located within the chamber and is biassed by a spring into a closed position to close off the relief port. When the pressure in the by pass passage falls, the valve member is drawn into the open position in which it controls the opening of both the relief valve and the outlet in dependence upon its position.

Abstract: A liquid flow rate detector adapted for detecting whether a rate of flow for liquid flowing through a conduit is above or below a generally predetermined liquid flow rate, and for developing different control signals in response to detecting flow rates above and below that generally predetermined liquid flow rate.

Abstract: An oil pump which delivers an operating oil to a power steering mechanism of vehicle is designed to reduce the power which is wasted during a high speed operation. A subpump of a reduced capacity having a number of revolutions which varies with a vehicle speed is provided, in addition to a vane pump which delivers an operating oil to the power steering mechanism. A discharged oil from the subpump is delivered to act upon the rear surface of the vanes to enable a pumping action of the vane pump when operating at low speeds while the delivery of the discharged oil to the rear surface of the vanes is interrupted to cease the pumping action of the vane pump, and is delivered to the power steering mechanism when operating at higher speeds.

Abstract: Apparatus for diverting backflow includes a housing having first and second pressure openings for receiving fluid signals representative of first and second pressures. The housing has a gas inlet and a gas outlet and is formed with a gas transmission passage for carrying gas from the gas inlet to the gas outlet. The housing has a vent passage communicating with the gas passage and the region outside the vent passage for carrying fluid from the gas passage to the region outside said housing. Valve structure movable in the housing is responsive to the difference in pressures at the first and second pressure openings for blocking fluid flow between the gas passage and the vent passage when the pressure difference is greater than a predetermined value and allowing fluid flow from the gas passage to the vent passage when the pressure difference is below a predetermined value.

Abstract: A system and method for mixing a first grade of fuel with a second grade of fuel to create a third, intermediate grade of fuel includes a blend valve and a novel shut-off system for stopping fuel from flowing from the blend valve to a dispensing meter when either the first grade of fuel of the second grade of fuel is not being supplied to the blend valve.

Abstract: A hot feed gas is controlled by utilizing a nuclear magnetic resonance analyzer to analyze the composition of the gas and to provide at least one corresponding composition signal. A valve controls the flow of the gas in accordance with a control signal. A network connected to the analyzer and to the valve provides the control signal to the values in accordance with the composition signal so as to control the flow of the gas as a function of the composition of the gas.

Abstract: A system for marking unauthorized discharge of liquid waste product includes a supply for containing a dye tracer product within the confines of a factory, refinery, or vessel, an interface line for adding the dye product via a flow line to the discharge line of a factory, refinery or vessel, a valve controller for valving the flow of dye product between the supply tank and the discharge line, an activating device for activating the valve controller responsive to the sensing of a preset level of liquid waste product flow being discharged via the discharge line, so that unauthorized discharges of waste material via the discharge line automatically activates the valve controller to mix a dye product contained within the supply tank with the unauthorized fluid discharge.

Abstract: Method and apparatus for including within a carrier fluid to be utilized in different areas at least one additive in a constant predetermined concentration and at least one other additive in varying concentration depending on the particular area of use. For example, this invention allows various concentrations of one chemical such as a lubricant in a carrier liquid such as water to be delivered to selected different areas while maintaining a constant concentration of other chemicals such as chelates and the like in the carrier liquid. Thus, the invention lends itself to an apparatus and method of treating a plurality of zones of a processing line with a liquid, the liquid comprising a treatment liquid and a stock liquid in combination such as to maintain the concentration of one or more constituents constant while varying the concentration of one or more other constituents. The invention particularly concerns the lubricating of conveyors as in bottling lines and the like.

Abstract: An apparatus for blending two gases together in precisely adjustable proportions. The apparatus includes a mechanically adjustable, blending subassembly adapted to receive the first gas at a predetermined pressure and a one-to-one force balanced pneumatic relay which is operated by the first gas and which meters the flow of the second gas to the blending subassembly at a pressure substantially equal to the pressure of the first gas being supplied to the blending subassembly. Check valves are strategically located to prevent back flow of either of the gases being mixed when the device is being operated in the low-flow mode, thereby eliminating the requirement for time consuming balancing of the gas flow pressures.

Abstract: A valve assembly is provided for controlling pressurized inputs from two separate fluid sources, and in particular to provide enhanced isolation between the sources and to buffer short-term fluctuations in fluid flow. A high pressure chamber is provided which is separated into two chamber portions by a fluid-impervious flexible membrane. A valve, such as a ball valve, having a movable member is positioned in an inlet port in each channel portion, fluid flowing, for a preferred enbodiment, from a fluid source under pressure through the inlet port of a chamber portion, an output port in the portion and a restrictor to a mixer. A pressure differential in the chamber portions deflects the diaphragm to bear against the movable member in the lower pressure chamber portion, closing the valve for this chamber portion before the pressure is sufficient to result in any backflow therethrough.

Abstract: A closure member (64) is mounted at the lower end of a draw tube (14) for pivotal movement between an open position (FIG. 4) and a closed position (FIG. 3). The closure member (64) includes a first side part (68) having a lower outer surface (80) which contacts an upwardly facing first valve seat (76) when the closure members (64) is in a closed position. The closure member (64) includes a second side part (70) which extends laterally outwardly from the pivot axis (66). Side part (70) includes an upper outer surface (82) which contacts a second valve seat (78) when the closure member (64) is in a closed position. A first part (88) of a float arm (94) is connected to the second part (70) of the closure member (64). Float arm part (88) extends downwardly from side part (70) to a lower end connection (92). A coil spring (106) is interconnected between the lower end (92) of arm part (88) and the lower end (98) of arm part (96). A buoyant float body (102) is connected to the outer end of arm part (96).

Abstract: A temperature control flow valve has a body defining conduits for connection to sources of cold and hot water, a chamber for mixing the water, and a thermostat element for maintaining the temperature of the mixed water at or below a predetermined maximum temperature. The cold and hot water are combined through a mixing valve in a ratio (adjusted continuously by means of the thermostat element) to provide the mixed water at the predetermined temperature. The flow valve includes cold water and hot water pressure regulators, the hot water regulator being responsive to the pressure of the cold water to maintain the pressure of the hot water delivered through the regulator substantially equal to the pressure of the cold water.

Abstract: A system for mixing a first grade of fuel with a second grade of fuel to create a third, intermediate grade of fuel includes a blend valve and a novel shut-off system for stopping fuel from flowing from the blend valve to a dispensing meter when either the first grade of fuel of the second grade of fuel is not being supplied to the blend valve.

Abstract: A multi-layer forming nozzle includes a valve member which can open and close a flow passage of molten resin which forms an intermediate layer of a multi-layer molded product by injection molding. The valve member is operated in response to resin pressure differentials at the front and back of the valve member to accurately switch from a multi-layer operation to a single layer operation and vice versa. A three-layer nozzle in accordance with the invention has a nozzle body provided interiorly with a first resin path, a second resin path and a third resin path in the form of a concentric circle bending to the same injection opening. The valve member is located either in a mouth portion of the third resin path in the central portion positioned internally of a mouth portion of the second resin path or a mouth portion of the second resin path in the intermediate portion positioned internally of the first resin path.

Abstract: An energy saving vacuum/pressure regulator is installed between a pump and a load for the pump, such as a storage tank, and relieves the load on the pump when the fluid in the load has reached a desired pressure state. The pressure state can be either negative pressure, or positive pressure relative to the environment. The regulator relieves the pump automatically, so that the energy consumed during variable usage of the fluid is reduced.

Abstract: There is disclosed herein a small and compact vacuum pump which serves as a portable vacuum source. The pump basically includes a cylinder coupled with a handle, and a piston in the cylinder coupled with another handle, along with a suitable valving assembly for allowing a vacuum to be drawn at an inlet of the pump. More particularly, there is also disclosed a vacuum limiter which can be attached to or form an integral part of the pump. The vacuum limiter includes an assembly having a pair of valves one of which is adjustable for allowing the limit vacuum to be set. The adjustable valve is a metering check valve and the second valve is a holding check valve upstream of the first.

Abstract: A system for metering a fuel additive into a flow of fuel into a fuel tank includes a mixing unit coupled to the filler neck of the fuel tank. The mixing unit has a body with an axial main flow passage, having a fuel inlet and a mixture outlet. The fuel inlet is dimensioned to receive the standard nozzle found on conventional service station pumps for motor fuel. The body also has an additive inlet that communicates with the main flow passage through a metering passage controlled by a metering valve. The metering valve is actuated by a pivot arm having a first end that is in the flow path of fuel flowing through the main flow passage and a second end that engages one end of a pushrod, the other end of which engages a valving element in the metering valve. The flow of fuel against the first end of the pivot arm causes the pivot arm to pivot so as to push the pushrod against the valving element to move the valving element away from its seat, against the force of a biasing spring, to open the metering valve.

Abstract: An apparatus for blending two gases together in precisely adjustable proportions. The apparatus includes a mechanically adjustable, blending subassembly adapted to receive the first gas at a predetermined pressure and a one to one force balanced pneumatic relay which is operated by the first gas and which meters the flow of the second gas to the blending subassembly at a pressure substantially equal to the pressure of the first gas being supplied to the blending subassembly.

Abstract: A material regulating valve which controls the flow of an additive material into a primary material as a function of the volume, flow rate, and viscosity of the primary material. The device is comprised of a two sectioned body with a primary flow path and an additive flow path through the body such that the additive flow path intersects the primary flow path at one portion in the body. Located between the primary flow path and the additive flow path is a additive flow regulating component. The device also included a flow indicator which provides a visual confirmation when material is flowing through the primary path and a manual control component which provides a manual over ride of the normally self controlling flow regulating component.

Abstract: The present invention provides a pressure compensating device through which two separate fluid streams flow separated by a diaphragm. The flow of fluid on one side if the diaphragm is unimpeded while flow on the other side of the diaphragm is controlled as a result of movement of the diaphragm caused by pressure differentials.

Abstract: Apparatus for use with a swimming pool cleaner which includes a housing which defines a chamber, at least one inlet to the chamber and an outlet from the chamber, and a bouyant ball inside the chamber. The apparatus is installed or incorporated in a weir. When suction is cyclically applied to the outlet, and removed, the ball alternately blocks the outlet, and leaves the outlet unblocked. Correspondingly the pool cleaner is operated to clean a submerged surface of a swimming pool, or water is drawn directly from the pool and through a weir, for filtration. A more efficient cleaning of the pool takes place.

Abstract: A self contained mechanical bleed control apparatus for a fluid conveying system, such as a central vacuum system or a pressurized air system, includes a slide member housing which slidably supports an orifice plate having an air foil on one end disposed within a main flow conduit just upstream from a vacuum producer or downstream from the compressor in a pressurized fluid system. A source of bleed fluid communicates with the slide member housing and is valved by movement of the orifice plate. The orifice plate is biased to a position for communication of bleed fluid into the main conduit under low flow conditions. Increased flow through the main conduit acts on the air foil to slide the orifice plate against the urging of the biasing force to cut off the bleed fluid supply.

Abstract: A system is disclosed which may alternatively be used as a diverter or as a blowout preventer for a drilling rig. The system comprises a blowout preventer attached above a spool having a hydraulically driven sleeve/piston. An outlet flow passage in the spool, which may be connected to a vent line, is closed off by the sleeve wall when the spool piston is at rest.Hydraulic ports are connected above and below the blowout preventer annular piston and above and below the spool annular piston. The ports below the blowout preventer piston and above the spool piston are in fluid communication with each other. A hydraulic circuit is provided having two valves between a source of pressurized hydraulic fluid and a drain.

Abstract: N.sub.2 and CO.sub.2 are admitted, through separate valves actuated by single high hysteresis actuator, into a mixing device when the mixture is fed to a beer keg. The actuator is dependant upon the relative Co.sub.2 N.sub.2 mixture pressures so as to maintain the mixture pressure within predetermined limits and in one embodiment the use of a venturi mixing device ensures that the mixture composition remains substantially constant when the N.sub.2 and CO.sub.2 gases are at substantially different pressure.

Abstract: A device for regulating and metering liquid fertilizer in an inner container that is housed within an outer shell or inner tank housing. Each of these containers or tanks have a common upper surface or wall that is essentially at ground level and has accessed, through a threaded cap, into the interior of the inner tank that holds a quantity of liquid, nitrogen based fertilizer. The outer shell or inner tank housing a means for entry of water, essentially on one side thereof and exit of water on the other. As water enters the pressure of the flow forces a switching mechanism to actuate, and that opens a valve on the bottom of the inner tank. Liquid fertilizer is displaced into the flow of water through the device by venturi action, and the fertilizer and water are mixed.

Abstract: An intermittent suction regulator is disclosed operating from a vacuum system and is used to provide a plurality of pneumatic output signals to a positive pulse device for returning fluids removed from a patient during drainage thereof to clear the removal passageways. The suction regulator or control unit provides two (2) timed output signals, from one (1) intermittent vacuum to atmospheric pressure input. One output signal continually switches from a regulated vacuum signal to an atmospheric pressure signal while the other output signal switches from providing an unregulated vacuum signal to an atmospheric pressure signal. The signals are timed such that both are initially set to provide vacuum signals simultaneously, however there is a predetermined time delay between the time the regulated vacuum output signal switches from vacuum to atmospheric and when the unregulated vacuum output signal switches from vacuum to atmospheric.

Abstract: A valve system is provided for enriching a flow of one gas with flow of another gas, with the mixing of the gas flows being conducted so as to maintain a constant ratio of the two gases in the resultant flow. The system of the present invention is particularly well suited for use in enriching a flow of pressurized combustion air with a flow of oxygen. A mixing valve is utilized that has a body which extends into a supply line through which combustion air is ducted under pressure to a burner. The mixing valve provides an injection location at the center of the combustion air supply line where relatively movable valving components are positioned for introducing oxygen into the flow of combustion air. The introduction of oxygen into the combustion air flow is regulated in accordance with the flow rate of the combustion air as it is sensed at the location of the mixing valve. The body of the mixing valve defines a chamber that is divided into segregated portions by a flexible diaphragm.

Abstract: A self-regulating vacuum control valve with a needle valve operating in a narrow central bore that regulates the flow of pressurized air from a pressure source into such narrow central bore for passage and discharge from an enlarged bore. A vacuum is pulled in passageways in such enlarged bore which exert a vacuum pull on a control chamber and on one end of a diaphragm means. The diaphragm means is connected to the needle valve and has its one end subjected to atmospheric pressure. Such diaphragm and needle valve are spring biased to increase the air flow past such needle valve in opposition to the vacuum pull on such diaphragm. Such spring bias is adjustable to provide a predetermind vacuum pull on the control chamber that can be connected to a deicer pad for maintaining a predetermined vacuum pull thereon.

Abstract: Resilient side loading of vacuum brake booster check valves to inhibit valve pulsations and resulting valve noises generated by pulsations from the vacuum source.

Abstract: A pressure equalizing valve comprises a valve body with a longitudinally disposed bore therein, and a spool disposed in the bore for longitudinal movement to regulate fluid communication from an inlet port to outlet ports in response to a pressure differential between first and second sense ports disposed on first and second end faces of the valve body.

Abstract: A marine riser anticollapse valve is disclosed for preventing a marine riser from collapsing under external sea water pressure in the event of a sudden loss of internal drilling fluid pressure. An external valve structure is provided for each of a plurality of openings in the wall of a riser pup joint. Each of the valve structures includes a cylinder having an opening in communication with a body wall opening. A piston in each cylinder is subject to sea water pressure but is prevented from opening when riser bore pressure of a sufficient magnitude is applied internally to the piston via the pup joint opening and cylinder opening. When the riser bore pressure falls, the piston is driven to an open position allowing sea water to enter the riser.

Abstract: Apparatus and a method is provided for delivering a fuel additive to fuel flowing through a pump from an upstream side to a discharge side thereof for delivery to a dispenser with fuel flow through the pump and dispenser being controlled by a dispensing valve. The apparatus comprises a flow sensitive valve positioned upstream of said pump within the fuel flow and being arranged to open in response to fuel flow and close in response to absence of said fuel flow, conduit means in liquid flow communication with the discharge side of said pump to feed back fuel through said valve to fuel at said upstream side of said pump, and means disposed in said conduit means and responsive to the feedback flow of fuel through said conduit means for discharging fuel additive into said conduit for delivery through said flow sensitive valve into said fuel flow on the upstream side of said pump.