Abstract: A multiplexed hydraulic control system includes a pressure transducer fluidically connected to the multiplexer for sequential or periodic connection to a plurality of channels. The multiplexed hydraulic control system provides hydraulic control flows to a plurality of second stage valves while simultaneously multiplexing the pressure transducer. The pressure transducer may be multiplexed to multiple second stage valves or actuators to provide multiplexed feedback for closed loop control of the second stage valves. The system may be used to split or throttle fuel flow to the nozzles of a combustion chamber in turbine engines.

Abstract: A compressor includes a normally open discharge valve assembly for controlling compressed refrigerant flow from the discharge chamber through the compression members. This controlling of flow results in an increased performance for the compressor by reducing recompression volume and the elimination of reverse rotation at shut down. The discharge valve assembly includes a valve seat, a valve plate and a valve stop secured within a recess formed within the compressor. The valve stop and the valve seat include a contoured surface which is engaged by the valve plate when it opens and closes. The contoured surface control the movement of the valve plate.

Abstract: A valve system is provided for operatively coupling a high pressure source to a processing chamber that selectively cycles between high pressure and vacuum. The valve system includes a branch passageway that selectively communicates a source of intermediate pressure to a main passageway that couples the high pressure source to the processing chamber. The source of intermediate pressure may comprise a vent, a pump, or a source of pressurized fluid, etc. An inventive valve for sealing between the intermediate pressure and the vacuum pressure is also provided. The inlet of the valve is operatively coupled to the high pressure source (via one or more valves) and the outlet of the valve is operatively coupled to the processing chamber (via one or more valves). The valve stem is in continuous fluid contact with the inlet and is configured for high pressure sealing, and the outlet is configured for low pressure sealing and preferably comprises a resilient sealing member.

Abstract: A compressed air control device for a source of compressed air on motor vehicles, forming a unit of an electro-pneumatic unloader, an integrated electro-pneumatic multi-circuit control valve and an air-drier, comprising an inlet and an outlet provided in a common housing in which a chamber for the passage of compressed air is provided, the chamber being connected to the atmosphere via a controlled outlet valve in form of a safety valve in its opened position, a check valve being positioned downstream of the chamber, a means for alternatingly opening and closing the outlet valve and a plurality of control units of the same kind allocated to the respective circuits, the control units each comprising a check valve closing contrary to the flow direction and a means for controlled opening of the check valve.

Abstract: An emergency discharge control system for use with a cargo tank motor vehicle and a primary storage tank for remotely terminating the flow of product from the cargo tank of the cargo tank motor vehicle and the storage tank in an emergency situation is provided. The system includes a cylinder having a piston rod connected to a cable assembly of the cargo tank motor vehicle and a cylinder having a piston rod connected to a cable assembly of the primary storage tank for actuating the respective cable assemblies and closing the vapor valves and the liquid valves of the cargo tank and the primary storage tank. The piston rod is extended by passing pressurized fluid into the cylinder. A valve is interposed between the cylinder and a source of the pressurized fluid for controlling the flow of the pressurized fluid to the cylinder.

Abstract: Inexpensive two-port solenoid valves that can be connected with five-port solenoid transfer valves are provided. Two valve discs 25A and 25B constituting a two-port valve are inserted into a five-port valve body 15 having a supply channel 21 opened at the center of a valve hole 20; output channels 22A and 22B are opened on the respective sides of the supply channel; and ejection channels 23A and 23B are opened on the respective sides of the output channels. A pilot valve section 12 is used to drive the valve discs. The valve discs 25A and 25B use the fluid pressure in the supply channel 21 as returning force for the valve bodies, and each has seal members 28A and 28B for continuously sealing the portion between the output channels 22A and 22B and the ejection channels 23A and 23B, respectively, regardless of the operating positions of the valve discs; and each also has seal members 29A and 29B for opening and closing the portion between the supply channel 21 and the output channels 22A and 22B, respectively.

Abstract: An apparatus is disclosed for diverting a flow of exhaust from an engine of a truck having a truck bed and a muffler system, with the truck bed having a duct system. The apparatus includes an inlet for receiving the flow of exhaust from the engine. The apparatus further includes a first outlet connected to the muffler system and a second outlet connected to the duct system. The apparatus additionally includes a diverter member positionable between a first position and a second position, wherein (1) fluid communication between the inlet and the first outlet is prevented when the diverter member is positioned in the first position, and (2) fluid communication between the inlet and the second outlet is prevented when the diverter member is positioned in the second position. Moreover, the apparatus includes an air cylinder for moving the diverter member between the first position and the second position.

Abstract: An on/off, protective circuit has a pressure line with an inlet for connection to a pressure source and an outlet for connection to the pressure port of a hydraulic system, such as a reciprocating conveyor. A relief valve is spring biased into a closed position and openable by pressure in the pressure line to short circuit pressure from the pressure line to a return line when an on/off valve is in an off position. The spring biasing of the relief valve causes residual pressure in the pressure line. To prevent communication of the residual pressure out through the pressure outlet and into the hydraulic system and thereby prevent creeping movement in the system, a check valve is provided in the pressure line downstream of the relief valve. The check valve has a valve plug positioned to be closed by pressure in the pressure line.

Abstract: A diaphragm valve for controlling a flow of gaseous or liquid fluid and including a valve housing having a valve chamber, into which opens a central channel and on each side thereof a first side channel and a second side channel, respectively, each having an external connection for fluid, valve seats arranged in the housing, an elastic diaphragm adapted to be brought into and away from sealing contact with at least one of the valve seats and controls for actuating the diaphragm. At least one portion of each valve seat is common to the central channel and one of the side channels. Two controls are arranged to press the diaphragm against one such portion each, thereby to shut off the passage of fluid between the central channel and the respective side channel, and to raise one portion each of the diaphragm off the respective portion of the valve seat thereby to open passage of flow between the central channel and the respective side channel.

Abstract: A valve has a flexible sheet member which moves toward and away from a flat, non-flexing sheet member to cover and open two holes in the nonflexing sheet member to block or permit fluid flow between passageways in a second valve body portion member. The flexible sheet member is extendible into a recess formed in a first valve body portion member above the two holes so that fluid flows from one passageway through a chamber formed between the non-flexing sheet member surface and the faring surface of the flexible sheet member. The plunger head of a solenoid forces the flexible sheet member into contact with the non-flexing sheet member and when excited causes the plunger head to be moved out of contact with the flexible sheet member allowing the flexible sheet member to uncover the holes in the nonflexing sheet member.

Abstract: A gas cabinet manifold is free of dead-legs both during delivery of process gas to a semiconductor fabrication tool location and during purging of the manifold. The manifold includes three similar dual valve assembly blocks. Each valve assembly block includes two valves and each of the valves has a valve chamber in which are formed three ports. Each valve also includes a mechanism for selectively closing one of its three ports. Each of the valves has one of its non-closeable ports connected via a conduit to a corresponding non-closeable port of the other valve, and the other non-closeable ports are connected by a second conduit which is connected by a third conduit to a port by which gas may be introduced into the valve block. A vacuum venturi or other vacuum source is used to vent process gas from a high pressure area of the manifold by way of a pressure regulator and a low pressure area of the manifold.

Abstract: A stream selector for a process analyzer. The stream selector includes a valve module having two block valves and a bleed valve. In a first mode, the block valves are closed and the bleed valve is open. In a second mode, the block valves are open and the bleed valve is closed. In a third mode, all of the valves are open, thus ensuring that the module is completely purged. A stream-selection valve manifold is made by joining two or more valve modules side by side to form a common outlet and a common passageway, thus ensuring that the manifold is completely purged. The stream selector also provides a single block-and-bleed valve module having a disposal passageway which establishes fluid communication between a vent compartment and an external area suitable for the safe disposal of sample fluids and compressed gas contained in the valve module.

Abstract: The lower lip of an aircraft inlet cowl has a first transverse slot formed through an upper surface of the lower lip while a second transverse slot is formed through a lower surface of the lip. A rotating vane is transversely located in the interior of the lip, between the upper and lower slots. A duct located within the interior of the lower lip delivers pressurized engine bleed air to the rotating vane. Selectively driven gears position the vane so as to block either one or the other of the slots, depending upon aircraft speed, so that normal cowl inlet air is energized in the vicinity of the slot outlet. This prevents separation of the normal inlet airflow from the cowl surface - and reduces drag that would otherwise develop.

Abstract: A device for distributing pressurized water to a plurality of sprinkler lines is provided. The valve and valve control portions are centralized, and thus no electrical connection to remote locations is required. The valve system is modular so as to permit addition or deletion of modules for adding or removing control of sprinkler lines. A stepper motor and cam shaft system permits expenditure of energy only during change-of-state events, so that no electrical energy need be consumed to maintain a watering state. A generator which produces electrical energy from the pressure head of a pressurized water source provides electrical energy for operating a motor and a motor controller, such as a device including a microprocessor.

Abstract: A multi-function metering device having a plurality of control valves arranged on an annular support. Each control valve can be controlled independently of the others. The annular arrangement of the valves allows the lines to be kept short so that the metering device is particularly suitable for micro-scale work such as in a sequenator or a synthesis machine for the production of nucleotides or peptides.

Abstract: Marking apparatus for moving a marking head to coordinate positions utilizing two fixed stepper motors performing in conjunction with a cable and pulley drive system. The dynamics of pneumatically driven marrker pins within marker heads are accommodated for by a topology which includes a marker support base which, in turn, is supported in force transfer relationship with an air bearing which rides over a fiat platen surface. Improved marker head structure is developed utilizing a polyetherimide material and a design providing the introduction of return air into a two-component piston chamber at a location above a seating surface.

Abstract: A stream selector for a process analyzer. The stream selector includes a valve module having two block valves and a bleed valve. In a first mode, the block valves are closed and the bleed valve is open. In a second mode, the block valves are open and the bleed valve is closed. In a third mode, all of the valves are open, thus ensuring that the module is completely purged. A stream-selection valve manifold is made by joining two or more valve modules side by side to form a common outlet and a common passageway, thus ensuring that the manifold is completely purged. The stream selector also provides a single block-and-bleed valve module having a disposal passageway which establishes fluid communication between a vent compartment and an external area suitable for the safe disposal of sample fluids and compressed gas contained in the valve module.

Abstract: A control system for a mechanically-driven liquid pump coupled to an air spray gun wherein the control system includes an air pressure monitor to detect air flow to the spray gun and an electrically-operated solenoid valve to relieve liquid pressure in the spray gun liquid delivery line when the spray gun is inoperable, and to control a clutch mechanism to drive the pump when the spray gun is operable or when the pump is being primed; the air pressure monitor including a diaphragm-operated switch connected to permit the diaphragm to detect air flow to the spray gun.

Abstract: A pressure regulating unit for providing controlled pressure for use in displacing syrups in a carbonated beverage dispensing system, the unit including a block made of a single piece of metal and having mounting structure integrally provided thereon and a high-pressure gas flow passage provided therein and having a high pressure inlet, the unit also including pressure regulators that are supported on the block and have gas inlets communicating with the high-pressure gas flow passage.

Abstract: A replaceable ink reservoir for an ink printer [means comprises a means to] prevent unauthorized refilling and includes[. This means can be composed of] a magnetic contact element [(13)] arranged in the ink reservoir or [can be composed of] a clack valve arranged in the delivery region of the ink reservoir.

Abstract: A control system for a mechanically-driven liquid pump coupled to an air spray gun wherein the control system includes an air pressure monitor to detect air flow to the spray gun and an electrically-operated solenoid valve to relieve liquid pressure in the spray gun liquid delivery line when the spray gun is inoperable, and to control a clutch mechanism to drive the pump when the spray gun is operable or when the pump is being primed.

Abstract: The device for introducing reagents into an organometallic vapor phase deposition apparatus consists of a valve body having two chambers, each of which can be placed in communication with a passage for the introduction of the reagent and is permanently connected with two passages traversed by carrier gas.

Abstract: A fluid flow control valve includes a first spool member (1) the position of which controls an output fluid flow from the valve, and a control (23, MP) which controls the position of the first spool member (1), a second spool member (6), independent of the first spool member (2), is mounted in a common chamber (1) with the first spool member (6) so as to cooperate with an outlet port (15) through which the output fluid flow passes and to be movable in response to the pressure drop across the outlet port (15) so that its position is related to the output fluid flow. A feedback (22', 24) is responsive to the position of the second spool member (16) and provides an input to the control (23, MP) so that the control operates as a servo control system. The first spool member (2) includes two landed sections (3, 4) which are spaced apart with the second spool member (6) therebetween.

Abstract: An L-shaped mixing head for reaction injection molding apparatus comprises a first chamber wherein a plurality of reactive molding components are impingement mixed under high pressure. A second chamber intersecting with the first chamber quiets the resulting stream of mix product prior to its exiting the mixing head. The outlet end of the second chamber is defined by the inner surface of a sleeve, the material of which has a yield strength less than that of the materials of the mixing head body and the second plunger. Most preferably, the sleeve material is also chemically nonreactive with and nonadherent to the reactive molding components to be used therewith, both individually and as mixed.

Abstract: A single-use, disposable patient valve for use in cardiopulmonary test apparatus comprises a molded, flexible, elastomeric tubular body of a cruciform shape an cooperating with the stem portion of the cross are first and second selective actuatable clamps which, when actuated, pinch off the flow of gases across the pinched portion.

Abstract: A fluid flow control valve for use with chemical fluids where avoidance of contaminants is important, is provided. The valve has a flow control chamber divided into an analytical section and a driver section by a metallic foil membrane operating member, clamped between the peripheral rim of the chamber and the upper wall. The foil membrane is moveable in response to driver fluid pressure between open and closed positions. The upper portion of the rim which engages the membrane is of relatively small surface area, and is made of a softer material than that from which the membrane and the upper wall are constructed, thereby providing a very effective means of sealing the membrane periphery to the upper wall when tightly clamped. The membrane is of domed shape, and is formed in situ by deformation of a planar metal foil sealingly clamped in position within the chamber, by application of fluid pressure thereto through a port to the chamber.

Abstract: A poppet valve device according to the present invention is adapted to sequentially operate a plurality of poppet valves the switching operation of a pilot valve, for example, an electromagnetic solenoid or the like which operates in response to an external input signal. The above-mentioned poppet valve device includes first and second poppet valves (A, B) each of which is constructed so that a poppet (32) for communicating or intercepting an inlet port (30) and an outlet port (31) with or from each other may be moved towards a communicating position by an inlet port side pressure acting upon its pressure receiving portion (32a). The poppet (32) may be moved towards an intercepting position by a pressure acting upon its back pressure chamber (38a, 38b).

Abstract: A pressure regulator and relief valve including a valve body, a first regulating valve moveable between first and second positions in response to a predetermined gallery pressure for regulating the pressure of a fluid, a second relief valve moveable between first and second positions in response to a predetermined relief pressure of a fluid and a single spring disposed within the valve body for biasing both the first regulating valve and the second relief valve to their respective first positions within the valve body.

Abstract: In a fluid control valve, a check valve is provided between the pump port and the first fluid chamber and allows the fluid to pass therethrough only in a direction from the pump port to the first fluid chamber, a down control valve is provided between the first fluid chamber and the second fluid chamber, an up control valve is provided between the first fluid chamber and the third fluid chamber, the fluid is allowed to flow from the pump port to the cylinder port through the check valve and through the down control valve when they are opened, and the fluid from the cylinder port to the tank port is allowed to flow through the down control valve, through the first fluid chamber and through the up control valve when they are opened. The fluid control valve can be obtained simple in structure and high in precision, and be allowed a reduction in cavitation and noise.

Abstract: The present invention provides constant fluid flow and constant pressure to chemical analysis monitors 24-26 for reliably monitoring the quality of fluid in a plant such as a power generating plant. A high pressure fluid source 28 provides fluid to a forward pressure regulating valve 30. The valve 30 supplies a metering valve 36 which regulates flow. The pressure on the output side of the metering valve 36 is maintained constant by a back-pressure regulating valve 40. The constant pressure and flow fluid is supplied from between valves 36 and 40. Excess fluid bled off by valve 40 can be returned to the source 28. A second stage of pressure regulation which improves pressure constancy can be provided by valves 45 and 46 at the first stage pressure or at a different pressure.

Abstract: A diverter valve includes a valve body formed with a pair of openings. Inlet ends of a pair of discharge tubes are respectively carried by and extend through these openings. An elongated elastomeric strp then may be wound about each tube extended end to form a gasket. This wound strip is held in place by a clamp. The valve further includes a movable member formed with an opening to carry an outlet end of an intake tube. The movable member is pivotally attached to the valve body by two spaced apart pairs of link bars. As connected, the pairs of link bars are positioned in a parallel relationship. Operatively attached to one end of the movable member is a piston rod of an air cylinder which in turn is attached to the valve body. During use the movable member may be selectively positioned by the air cylinder to align the outlet end of the intake tube end with either discharge tube inlet end.

Abstract: A valve is disclosed comprising a first body portion (2) having a first surface (16), a second body portion (4) having a second surface (51) facing the first surface, a flexible sheet (8) positioned between the first and second surfaces, a void (4) in the first body portion created and defined by a concave surface (46) formed in the first surface and one side (18) of the flexible sheet. There are at least two fluid passageways (20) (22) in the first body portion communicating with the void at spaced locations, at least one of the fluid passageways being a channel formed in the first surface and terminating at the void.

Abstract: A valve is disclosed comprising a first body portion (2) having a first surface (16), a second body portion (4) having a second surface (51) facing the first surface, a flexible sheet (8) positioned between the first and second surfaces, a void (4) in the first body portion created and defined by a concave surface (46) formed in the first surface and one side (18) of the flexible sheet.There are at least two fluid passageways (20) (22) in the first body portion communicating with the void at spaced locations, at least one of the fluid passageways being a channel formed in the first surface and terminating at the void.

Abstract: A modular color changer provides selected paint colors for spraying and recirculates nonselected colors. A module is provided for each paint color to be selected, and each module has an inlet for connection with a respective supply of paint, a recirculate outlet, a delivery outlet and a single valve member. The valve member may be selectively engaged with either a first or a second seat, depending upon whether paint at the inlet is to be directed to the recirculate outlet for return to the supply or to the delivery outlet for flow to a paint applicator. Solvent and air purge valves are upstream of the modules for cleaning the color changer of one color of paint in preparation for supplying another.

Abstract: A high pressure fluid valve includes a tubular portion with a valve seat on its end and a closure element for engaging the valve seat. A piston carries either the tubular portion or the closure element as a movable valve member, with the other being fixed. A first fluid chamber is provided adjacent the valve seat and a second fluid chamber is spaced therefrom adjacent the other end of the movable valve member. When the movable valve member is actuated, one of the fluid chambers increases in volume by the same amount that the other decreases in volume, thereby maintaining the internal volume of the valve constant.

Abstract: A method and apparatus for forming and selectively interrupting one or more fluid stream which is confined within an open channel. A transverse fluid stream is introduced into the channel at a point under the stream flowing within the channel. Introduction of the transverse stream at relatively low pressures is sufficient to cause the stream within the channel to leave the confines of the channel. If the channel is directed at a target, the method and apparatus will allow intermittent and selective interruption of a fluid stream flowing within the channel and directed at the target.

Abstract: A pressure actuated flow control valve for use in conjunction with inflatable packers and grouting systems on offshore oil platforms. The valve includes an elongated body with a plurality of pistons slidably disposed in the body between first and second positions, each piston being positioned adjacent a corresponding discharge port on the body. When in the first position, the piston sealingly closes the corresponding discharge port. When the piston is in the second position, the piston sealingly closes another discharge port adjacent the corresponding discharge port. A plurality of sleeves are annularly positioned around each of the pistons. First and second pressure lines are provided in communication with volumes adjacent opposite ends of pistons such that alternate pressurizing of the first and second pressure lines results in sequential movement of the pistons from the first to second positions.

Abstract: In a valve system for controlling the flow of liquid fuel and steam to a nozzle in a large scale power plant boiler, a pair of valves are operated by rotary pneumatic actuators. Three-position operation is achieved for one of the valves by coupling the valve shafts together through a lost-motion coupling and using an actuator for the other valve which delivers more torque than the actuator which operates the three-position valve. The same actuator and coupling system can be used for straight high pressure mechanical atomization, for mechanical atomization with recirculation, and for steam atomization, with simple substitution of rotary valves.

Abstract: A valve assembly (10) for controlling high pressure gas with low controlling gas pressures. The assembly includes a valve housing (12) having a cavity (22), an inlet port (26) and two outlet ports (28, 30). Mounted within the housing in communication with each outlet port are tubular members (38), each having a closed end (38.3) and an aperture (42) in a smooth cylindrical sidewall (38.2). A wobble bar (50) within the cavity is associated with a rubber-like sheet of material (54), which sheet has two sealing portions (56.2, 56.4) draped over the apertures. A very soft sponge-like resilient block (56) normally holds the sealing portions against the apertures to cause the apertures to be sealed. Actuating structure causes the wobble bar to be moved from a normal position to an operative position, an end of the wobble bar bearing down upon another portion of the rubber-like sheet of material to cause an adjacent sealing portion to peel away from the aperture to permit flow through the aperture.

Abstract: A spray bar having a plurality of nozzles and an elongated header for spraying liquid. The header is made up of a top, intermediate and bottom plate. Between the top plate and the intermediate plates are defined a plurality of independent fluid passageways coupled to individually controlled fluid operated valves having each nozzle assembly. Between the intermediate plate and the bottom plate is a liquid cavity. The nozzle are mounted in openings in the bottom plate and sealingly cooperate with the intermediate plate and extend through the liquid cavity. The flow of liquid through each of the nozzles may be independently regulated by varying a control fluid signal to enable the liquid in an application rate to be varied axially along the header.

Abstract: A plurality of pilot operated coolant control valves are mounted in a multiple configurationed manifold positioned to supply coolant to spray nozzles upon activation of adjacent pilot valves within the same manifold via remote power and signal sources.

Abstract: A high pressure mixing head for mixing reactive components in reaction injection molding includes a mixing chamber discharging into a quieting chamber and an injection valve for injecting reactive component into the mixing chamber. Recirculation passages for the reactive component are provided in the mixing chamber and internally of the injection valve. The recirculation passage internally of the injection valve is selectably opened and closed as is the outlet from the injection valve into the mixing chamber. Both the injection valve outlet and the recirculation passage internally of the injection valve are selectably throttleable.

Abstract: An improvement to reduce the size of a directional control valve by providing a plurality of pilot spool valves in a single valve casing. A plurality of valve mechanisms are juxtaposed in a monolithic valve casing by individually inserting valve members in a plurality of parallel valve bores provided in the valve casing. A plurality of cylinders corresponding to the valve bores are pierced in an intermediate plate mounted on the valve casing from that face which comes in contact with the valve casing. The cylinders communicate with each other by means of grooves cut in the aforementioned contacting face and open into the atmosphere through a relief port. The adjoining cylinders are thus brought closer, and the valve bodies are driven by pilot fluid pressure that act on the pistons fitted in the individual cylinders.

Abstract: Briefly, the present invention comprises the improvement in a valve arrangement for controlling the flow of a fluid including a valve block having at least one substantially flat valving site on a surface thereof, the valve block defining passages communicating with the valving site through openings, a resilient diaphragm covering the valving site and forming a fluid tight seal with the valve block along the periphery of the valving site and a closure element having a substantially flat closure surface, the closure element being actuable between an open condition wherein the closure surface is retracted a preselected distance from the valving site and diaphragm, and a closed condition wherein the closure surface forces the diaphragm against the valving site; whereby the diaphragm can be urged away from the valving site by fluid pressure in the passages and the closure element is in the open condition, establishing a valve chamber above the valving site for fluid flow between the passages, and if forced agains

Abstract: In an exhaust emission control system for an automotive internal combustion engine, an air control valve assembly either directs air flow provided by an engine driven air pump to the engine exhaust ports or to an exhaust system catalytic converter, or diverts the air flow away from the exhaust system. The air control valve assembly has a single diaphragm with three independent diaphragm valve elements, each operated by the air pump discharge pressure.

Abstract: Modular circulating and dead end color changers are made from synthetic materials inert to chlorinated hydrocarbon solvents. Universal supply and return manifolds have relatively smooth and uninterrupted walls defined, in part, by inlet and return valve surfaces, for easy solvent flow cleaning. Circulating high pressure color changes have improved actuators and circulating means including bypass lines for continuously recirculating both selected and non-selected paints. Valve sealing is enhanced by improved valves and pressure drop across each module is minimized by modular construction regardless of the number of modules used.

Abstract: A valve assembly for controlling the application of suction and counterblow air to a blank mould of a glassware forming machine. The assembly comprises a body (1, 2, 3, 4) in which are enclosed a first valve (5) for controlling the application of suction, a second valve (6) for controlling the flow of counterblow air, and a third valve (7) for venting the blank mould. The body (1, 2, 3, 4) has a central chamber (32) through which the suction is applied when the first valve (5) is open, through which the counterblow air passes when the second valve (6) is open, and through which the mould is vented when the third valve (7) is open.

Abstract: An air regulator system using air-piloted valves for controlling a plurality of different air flows in a powder spray system. A control regulator is used to set the flow rates of a plurality of flow regulators, each of which is associated with a particular air flow in the powder spray system.

Abstract: A modular color changer provides selected paint colors for spraying and continuously recirculates both selected and non-selected colors. A module is provided for each color to be selected and includes supply and return manifold blocks defining, respectively, portions of a respective universal supply manifold and of respective universal return manifold. Port control valves are utilized to control paint flow therethrough, under normal supply pressures. Solvent and air purge valves are used for cleaning. The changer is particularly advantageous when used in high pressure spraying systems. Modules can easily be added to a basic changer to increase the number of selectable paints.

Abstract: A control arrangement for a gas-fired system. Three diaphragm-operated valves are in series providing a stage operation. The valves are pilot controlled. A booster pump is provided for cooperation with the pilot valves to boost the line pressure to the first of the valves, the boosted pressure being sufficient to operate the diaphragm valves, and the boosted pressure being controlled by the pilot valves. The booster pump operates only when needed. Diaphragm-operated pilot valves means are provided which operate two separate pilot valves which control the pressure on the opposite sides of the diaphragm of the diaphragm valves. The system provides stage operation, the stages including a first stage which is closing of a vent valve connected between diaphragm control valves, opening of a first diaphragm valve, and a third stage which is a controlled slow opening of the second diaphragm control valve. The first diaphragm valve is both a control valve and a pressure regulator.