Abstract: An improvement of an adjustable-rate, flow-regulated, constant-output emitter comprising a flow-regulating valve having a valve head accessible to the high-pressure liquid and a valve stem one end of which is attached to, or integral with, the valve head, and a valve seat associated with the valve head and located in a high-pressure region upstream of a first chamber, the valve seat and the valve head defining between them a gap through which the liquid passes on its way from the high-pressure source into the first chamber, wherein the valve head is adapted to be acted upon by a first force tending to reduce the gap, and by a second force tending to increase the gap, a state of equilibrium between the forces defining the set point of the flow-regulated emitter.

Abstract: In order to control fuel flow at a fuel delivery point for auxiliary power units, and for other low fuel flow applications, an altitude-sensitive fuel flow control device (10) includes a fuel inlet (12) in communication with a fuel source and a fuel outlet (14) in communication with a fuel combustor. The device (10) includes an axially extending rod (16) having a metering surface (22) intermediate the ends (24, 26) thereof which may be located in various positions relative to a fuel flow path (18a, 18b, 18c, 18d, 18e) extending from the fuel inlet (12) to the fuel outlet (14) by axial movement of the rod (16) which varies fuel flow within a preselected range of altitude-dependent fuel flow rates.

Abstract: A flow selector and regulator for use in an I.V. administration arrangement which includes the capability of establishing the flow rate without calibration at the time of use and then automatically maintaining that flow rate regardless of changes in fluid pressure in either or both of upstream or downstream of the regulator. The regulator utilizes a diaphragm which is not subject to stretching or material stress prior to use to control an orifice. The regulator is capable of being calibrated at the time of manufacturer directly in terms of flow rate, something which is not possible in prior such devices. The diaphragm is clamped at the rim and has an arcuate torus facing the inlet and a bulbous central section which controls flow through an outlet orifice. Liquid bypasses the diaphragm through the rim. Other embodiments incorporate the regulator into a drip chamber and reduces the number of parts of the regulator to three members which can be snapped together.

Abstract: Improved flow control valves are disclosed which are exceedingly accurate in maintaining a constant predetermined flow rate regardless of inlet and outlet pressures. The valves are preferably designed to enable them to be fabricated almost entirely from suitable polymeric composition materials. One embodiment disclosed is extremely well suited for ultra-pure applications which require extreme care to avoid any possible contamination of the liquid flowing therethrough. Another embodiment is disclosed which is designed to achieve substantially zero leakage flow thereby rendering it particularly well suited for use in applications requiring exceedingly precise flow control and in particular relatively low flow rate applicatins wherein leakage flow is of greater significance.

Abstract: A fuel dispensing nozzle for refueling vehicles is disclosed. The nozzle provides a poppet valve for manually controlling the flow rate through the nozzle and an automatic flow control regulator for limiting the maximum flow rate through the nozzle to a predetermined maximum flow rate. The illustrated embodiment provides the automatic flow regulator in an existing passage within the nozzle body downstream from the poppet valve. Therefore, the regulator can be retrofitted into existing nozzles without separate fasteners or the like. The regulator includes a polymeric sleeve having lateral ports and a piston slidable in the sleeve providing an orifice around the operating rod of the poppet valve. A spring normally maintains the piston in its full open position. When flow rates approach the maximum desired predetermined flow rate, a pressure drop occurs through the orifice, producing a force overcoming the spring and causing the piston to move down and partially cover the ports in the sleeve.

Abstract: The flow-rate control device (10), which is arranged in a branch line (6), comprises a slide (19) forming, together with an outlet channel, a variable constriction (.sigma..sub.1), the slide being biased by a spring, one end of which bears against the end of an actuating rod (30) biased by a piston (21) actuated by a speed-reducing servo-drive unit (22) controlled by an electrical signal (11) dependent on a significant parameter, for example the speed of a vehicle for power-assisted steering of the vehicle. The rod (30) further controls an internal bypass passage (33, 34) parallel to the variable constriction (.sigma..sub.1).

Abstract: A proportional type hydraulic distributor incorporates a distributor slide valve including a feed chamber. It is provided with a pressure compensator device for regulating the feed pressure to the feed chamber according to the output (load) pressure of the slide valve. This device includes an inlet channel, an outlet channel communicating with the feed chamber and a stator communicating with the inlet and outlet channels. A compensator slide valve slides in a housing in the stator. A spring exerts an axial force on the compensator slide valve in the same direction as the force exerted on it by the output pressure and in the opposite direction to the force exerted on it by the feed pressure. An annular obturator member on the compensator slide valve isolates the inlet and feed channels and is acted on by a return spring on the compensator slide valve. The latter has a recessed part on which the obturator member slides without clearance.

Abstract: A proportional throttle valve which varies the throttle cross-sectional area in dependence upon a control signal and thus governs the flow rate. The invention relates to a throttle valve in which the position of the valve member remains constant independent of pressure fluctuations upstream and downstream of the throttle cross-section. For this purpose the pressure acts on equisized opposing faces of the valve member. An annular face of equal magnitude lying opposite the control face is subjected to the pressure in a line leading from the pressure-limiting valve for setting the control pressure to the tank so that pressure fluctuations in this tank line cause corresponding variations of the control pressure and the position of the valve member remains constant.

Abstract: The flow-rate control device (10), which is arranged in a branch line (6), comprises a slide (19) forming, together with an outlet channel, a variable constriction (.nu..sub.1), the slide being biased by a spring, one end of which bears against the end of an acutating rod (30) biased by a piston (21) actuated by a speed-reducing servo-drive unit (22) controlled by an electrical signal (11) dependent on a significant parameter, for example the speed of a vehicle for power-assisted steering of the vehicle. The rod (30) further controls an internal bypass passage (33, 34) parallel to the variable constriction (.nu..sub.1).

Abstract: Portable emergency breathing apparatus is disclosed which is comprised of a unitary, generally flat manifold having opposite ends and top and bottom sides and a manifold passageway between the opposite ends. Three parallel, laterally juxtaposed compressed gas containers are mounted on the bottom side of the manifold by means of coupling components extending through the manifold from the top side and into internally threaded necks of the containers. Each of the coupling components provides flow communication between the interior of the corresponding container and the manifold passageway, and a shut-off and pressure reducing valve assembly is mounted on the manifold between two of the containers. The valve assembly has upper and lower portions respectively adjacent the top and bottom sides of the manifold with the lower portion disposed in the space between the necks of the two adjacent containers.

Abstract: Aseptic constant flow valves to be used, for example, in the dairy industry should be readily washable and allow sterilization by means of conventional washing and sterilizing agents. A valve which fulfils these requirements comprises an operating chamber with inlet and outlet which is connected to the valve housing and therefore can be circulation-washed and sterilized together with the latter.

Abstract: A flow control valve comprising a housing formed with an intake passage, a drain passage and a discharge passage; a main spool and an auxiliary spool which are slideably housed within the housing; a first orifice disposed between the intake passage and the discharge passage; a second orifice disposed between the intake passage and the discharge passage and having an open area variable in response to displacement of the auxiliary spool; a drain orifice disposed between the first orifice and the drain passage and having an open area variable in response to displacement of the main spool; the main spool being movable in response to a first differential pressure; the auxiliary spool being movable in response to a second differential pressure; and a control ring secured within the housing and adapted to vary the open area of the first orifice in response to displacement of the auxiliary spool movable in response to the second differential pressure.

Abstract: An hydraulic unloading valve for unloading hydraulic fluid from a circuit pressurized by a diesel engine powered pump under cold climate conditions to assist starting of the engine. The valve has an inlet through which fluid enters the valve, an outlet through which fluid may leave the valve, an outlet valve seat, a valve member movable towards and away from the valve seat and carrying a valve surface for closing off the seat valve, a first orifice sensitive to viscosity which in response to the flow of fluid through the inlet generates a first pressure drop arranged to tend to move the valve member away from the valve seat, and second orifice which is not sensitive to viscosity and which in response to said flow generates a second pressure drop arranged to tend to move the valve towards the valve seat to bring the valve seat and surface into contact to close-off through the valve outlet when the second pressure drop is greater than the first pressure drop.

Abstract: A fluid flow regulating valve for controlling the flow of a corrosive fluid, the valve including an axially unrestrained movement of the piston in accordance with the fluid flow varies the effective size of a flow control orifice to regulate the fluid flow.

Abstract: The device for controlling flow (10) situated in a branch hydraulic line (6), comprises a piston slide (15) sliding a bore (14) into which an inlet passage (36) and an outlet passage (20, 21) open, the slide forming with the outlet passage (21) a modulable restriction (s); the device comprsies a fluid passage between the inlet and outlet passages which includes a first portion (32, 33, 34), formed in the slide (15), and a second portion (19, 24, 23, 22) which is formed in the body (13) and is closed selectively by a spring biased (27) valve member (26) and the plunger (28) of an electromagnetic control member (9) piloted by an electrical signal which is a function of a significant parameter, for example the speed of a vehicle for the assisted steering of a vehicle.

Abstract: A positive crankcase ventilation control for an internal combustion engine having a selectively operated bypass to a conventional pressure responsive flow control.

Abstract: A proportional hydraulic distributor with a hollow, cylindrical compensating slide, a seat at one end of the compensating slide, a reciprocable piston, an end of which is urged against the seat by a spring, a pressure assistance chamber surrounding the seat, and a choke connecting the entry pressure of the hydraulic distributor to the pressure assistance chamber. The balance of forces on the reciprocable piston and on the cylindrical compensating slide is equal to and oppositely directed with respect to the hydrodynamic drag force that develops during transitional phases of the operation of the hydraulic distributor.

Abstract: A flow regulator valve has a first fluid opening at one end and a second fluid opening at the side of the valve body. A sleeve bore extends from the first opening and contains a stem which is co-axial with the sleeve bore, but spaced from it. A compensating spool is slideably mounted between the sleeve bore and the stem and may move to completely close the second opening or to provide partial opening. A control spring biases the spool to the open position, but a fluid passage through the stem wall permits the pressure of the fluid at the first opening to be applied to bias the spool to the closed position. A valve element containing an orifice establishes the nominal flow rate desired, while the pressure drop across the spool causes it to assume a position to maintain the desired flow rate. A valve element control spring may be used to maintain the valve element in the "off" position until the pressure rises to a desired threshold. Venting of the cavity in which the valve element is located is provided.

Abstract: A liquid chromatograph includes a solvent tank, a pump, a sample injection element, a column, a detector, conduits for successively interconnecting these elements, and a flow controller which is connected between the pump and the detector and in parallel with the column.

Abstract: A fluid flow regulator for fluids containing fine solids in suspension, such as paint, has a sharp-edged orifice to meter fluid in accordance with pressure across the orifice. The pressure is determined by throttling action of a main poppet valve carried by a spool and controlled by three diaphragms. Valve opening pressures on the diaphragms are downstream fluid pressure, and pilot air pressure while valve closing diaphragm forces are applied by the regulated fluid pressure downstream of the poppet. This regulator is fully pressure-compensated for variations in downstream pressure. Valve leakage is positively prevented by applying pilot air pressure in a manner to seat the poppet valve. Valve flushing at a high flow rate is permitted by a second poppet which carries the sharp-edged orifice and opens to allow a bypass of the orifice during flushing. Flushing action is actuated by high pilot air pressure forcing the main poppet valve to full open position.

Abstract: A system for controlling flow of fluid along a conduit from a source of fluid under pressure to a consumer device comprises a primary throttle for connection in the conduit and controllable between a first condition in which it is at least partially closed and a second condition in which it is more fully open, and a secondary throttle defining at least one orifice for connection in the conduit and including a member which is displaceable to vary the area of the orifice. A first force dependent upon the pressure drop across the secondary throttle and a second force dependent upon the time integral of the pressure drop across the primary throttle are applied to the member, the first and second forces being oppositely directed, whereby the member is displaced towards a position in which the pressure drop across the secondary throttle bears a predetermined relationship to the time integral of the pressure drop across the secondary throttle.

Abstract: A pressure compensating flow control valve assembly for providing a constant flow rate for fluids having a high solids content is disclosed. The valve assembly includes a housing comprising first and second housing members having an inlet and an outlet, respectively, a deflectable diaphragm clamped between the housing members and which divides the housing into first and second chambers, and a control valve means carried by the diaphragm which includes a fixed control orifice in communication with the second chamber and outlet and a poppet valve for throttling flow of fluids from the inlet to the first chamber. The control valve means is constructed such that the fluid is caused to be moved in a tortuous path through the valve assembly so as to prevent or minimize solids in the fluid from settling out.

Abstract: The present invention provides a proportional-flow electrohydraulic control which includes both an electrohydraulic valve (36) and an electronic control (382). The electronic control includes an offsetting circuit (622) and is effective to produce an effective driving voltage, for an electrical force-motor (52) of the electrohydraulic valve, that is pulse-width modulated and that is greater than a fixed proportionality to an input signal (410) by a manually adjustable offset voltage. The offset voltage may be adjusted to provide a null force that exactly balances a spring (129) which presses a valve spool (54) to an overlapped position; so that fluid flow is proportional to an input signal irrespective of the initial load of the spring. Or, the offset voltage may be adjusted to provide a basic flow voltage; and then the rate of fluid flow that is delivered by the valve is greater than a given proportionality to the input signal by a substantially constant rate of fluid flow.

Abstract: The regulator valve has a first restriction of fixed size in series with a second, variable restriction defined between a tilting wall and an annular valve seat provided on a fixed wall. The tilting wall is sealed around its periphery to the fixed wall by an elastomeric membrane to define between the walls a first chamber, and the walls are biassed apart by a compression spring. A second chamber is defined on the opposite side of the tilting wall to the first chamber such that the tilting wall is subject to the pressure differential between the first and second chambers, and the first restriction connects the two chambers. The size of the second restriction is thereby made dependent upon the pressure difference between the two chambers. The tilting wall tilts about a fulcrum line. The valve seat may be pressure-balanced by a balancing member.

Abstract: A recirculating paint apparatus comprising a main body provided with a plurality of radially extending openings in communication with a main axially extending delivery channel, and a plurality of selectively operable valve assemblies for controlling communication between different color paints and the delivery channel is disclosed. Each paint is recirculated through its associated valve assembly right up to its valve for controlling flow through an orifice in communication with the common delivery channel so that all areas are subject to recirculating flow and any settling out of pigments or solids in the paint is prevented or minimized.

Abstract: A flow limit shutoff valve for automatically shutting off all flow between a source of high-pressure gas and a pressure regulator when that flow exceeds a preset flow rate. The flow to the shutoff valve is metered, resulting in lowering the pressure downstream from a metering valve. A main valve has a first chamber on one side downstream from the metering valve, and the valve's outlet is connected to this first chamber. A second chamber on the opposite side is connected to the inlet pressure. The main valve is biased in the opposite direction from that urged by the inlet pressure, so as normally to keep it open, but the main valve snaps shut when the inlet pressure forces overcome the sum of the downstream gas pressure forces and the biasing forces. To enable reopening, a bypass system connects the upstream side of metering valve to the first chamber, while there is a manually operated closure for manually opening and closing off the bypass to the first chamber.

Abstract: In a pressure compensated flow control system a flow control valve has a valve element which is subjected to pulsating fluid pressure by which it is maintained in a state of dither about a mean position corresponding to the selected flow rate through the valve. The valve element is spring-biased towards a closed position and is displaced against the spring bias by an amount which is a function of the rate at which fluid is applied on one side of the valve element and the rate at which the fluid is bled away via an orifice.

Abstract: A flow control device includes a housing (10) having a hollow metering valve element (55) disposed therewithin to control the effective flow area of the device. A pressure regulating valve element (70) is received within the metering valve element and maintains a relatively constant pressure drop so that a desired flow through the device may be set by a single adjustment of the position of the metering valve element.

Abstract: A flow control device includes metering and pressure regulating elements (70 and 95) disposed one within the other and movable independently of one another for accurate maintenance of a constant pressure drop across the metering valve at a fixed temperature. Bimetallic elements (145) adjust the position of the pressure regulating element in response to the temperature of the fluid to compensate for variations therein. The pressure regulating valve element is grounded to the housing (10) of the flow control device in part for ease in adjusting the preload of a spring (130) which balances the pressure regulating element against fluid pressures applied to opposite ends thereof. The metering element is positionable by the controlled application of servo fluid to a single end thereof.

Abstract: Variations in pressure drop set by an inline pressure regulating valve (70) are minimized by a spring (97) having a rate which is a select function of certain characteristics of the geometry of the flow controller and the fluid flows required to be handled thereby.

Abstract: An hydraulic system: a power assisted vehicle steering system which includes such an hydraulic system and a method of alleviating noise in an hydraulic system. The hydraulic system as applied to a vehicle steering gear (1) has an open center valve (3) which directs hydraulic fluid under pressure derived from a pump (12) and in response to a steering maneuver through a shaft (4) to a servo motor of the gear (1). Downstream of the open center valve (3) is a restrictor (8) through which hydraulic fluid from the valve (3) passes to a reservoir (11). The restriction effected by the restrictor (8) to fluid flow from the valve (3) to the reservoir is variable to provide a throttling action and a back pressure in the line (6) to alleviate noise in the valve (3).

Abstract: There is provided a fluid flow-rate control device comprising a housing, an elastic stretchable membrane dividing the interior of said housing into a first and a second chamber; an inlet port of said housing leading to a fluid source and communicating with said first chamber; and an outlet port of said housing communicating with said second chamber; wherein the first and second chambers are in fluid communication via at least one passageway the dimensions of which remain unchanged during operation, and said membrane is fixedly held and positioned between said chambers so that when said membrane is exposed to a fluid pressure differential, it is adapted to be stretched and a portion thereof to move, solely by virtue of its elasticity, between positions closer to said outlet port to restrict the rate of flow therethrough, and positions further away from said outlet port to increase the rate of fluid flow therethrough, whereby the flow of fluid through said outlet port is controlled at a constant rate by said me

Abstract: The invention is an improved pressure compensating flow limiting valve which maintains an optimum performance curve at differing flow rates. The invention is the specific placing of a vent passage in the valve spool immediately downstream of the fluid jet passing across the spool in a metering mode with the vent passage connected to one of the servo chambers which positions the spool. The effect of the exiting fluid jet draws some fluid from the vent passage thereby dropping the pressure level in that servo chamber sufficiently to offset certain dynamic forces on the spool and balance the spring forces on the spool with these forces regardless of the flow rate through the valve.

Abstract: A regulator assembly which receives a variable reference signal to control the fluid pressure of a supply fluid supplied to a motor. The variable reference signal which represents the work performed by the motor also passes through a relief valve. When the output torque of the motor reaches a predetermined value, the relief valve opens and a portion of the fluid supplied to the motor is vented to an exhaust conduit to protect any mechanism operated by the motor from receiving excessive torque.

Abstract: There is provided an adjustable-rate, constant output infusion set connectable in-line in an intravascular infusion system. The infusion set comprises a connector piece connectable to a container for the infusion liquid and a head piece rotatably attached to the connector piece and connectable at its lower end to a tube leading to the infusion recipient. An elastically stretchable diaphragm is interposed between the connector piece and the head piece. The connector piece forms with the diaphragm a first chamber in direct communication with the container via an inlet port, and the head piece forms with the diaphragm a second chamber in direct communication with the recipient via a control port. The head piece is rotatably attachable to the connector piece for adjusting the flow rate therethrough. The set further comprises an annular member interposed between the connector piece and the head piece, and a passageway which connects the first chamber and the second chamber.

Abstract: A method of and apparatus for removing fluids entering into a well bore from a well formation while the well is being drilled, such as gas, in which the gas bubble is chopped into small bubbles by mixing the gas with drilling mud and pumping the mixed gas and drilling mud upwardly through the drill string-bore hole annulus and removing it from the well.

Abstract: A fluid flow regulator valve to regulate flow to a fluid driven prime mover wherein a selectively shaped, spring biased spool is positioned within a cylinder and has a sensor orifice therein to establish a pressure drop thereacross in response to controlled fluid flow rate and hence cause the spool to move within the cylinder to control both the metering orifice to and the return orifice from the flow conduit which connects the cylinder to the prime mover.

Abstract: There is provided an in-line regulator for pressurized fluids. The regulator comprises a regulator sleeve disposed in a tubular, fluid-carrying line or in constituent parts of the line and is provided with at least one wall orifice through which the line or the constituent part of the line communicates with the outside. The sleeve is constituted by two flange-like end portions fitting the tubular line and a central portion connecting the flange-like portions and having smaller outside dimensions than the flange-like portions, in such a way as to define, in conjunction with the flange-like portions and with the inside wall of the tubular line, an annular output space. The central portion is elastically deformable by an inflatory force and the annular output space communicates with the inside of the tubular line via at least one constant-cross-section opening in at least one of the portions, and with the outside via the wall orifice.

Abstract: A valve for controlling fluid flow having a cavity divided into first and second chambers by a first bellows carrying a plunger which has one end extending into the valve outlet opening at one wall of the first chamber. A second bellows, co-axial with the first bellows, acts between the end of the plunger remote from the opening and a wall of the second chamber and forms a third chamber in communication with fluid at the outside of the opening by way of a longitudinal conduit in the plunger. Inlet fluid is supplied to the second chamber and is supplied to the first chamber by way of a manually operable flow control valve. The plunger position is dependent upon the difference in fluid pressures in the first and second chambers and varies the size of the opening. Fluid in the third chamber counter-balances the pressure of the fluid at the outlet on the end of the plunger thereat.

Abstract: An automatic fluid control valve for maintaining a substantially constant fluid flow rate includes a partition wall within a valve casing between a fluid inlet and a fluid outlet. A restriction adjusting member is mounted movably in the valve casing and includes a tapered end movable relative to a valve port in the partition wall to define a restricted passageway for fluids with the adjacent walls of the valve port. A valve stem is movable within the casing and has a valve thereon cooperable with the valve port to regulate the flow of fluids therethrough in response to changes in fluid pressure differential. A diaphragm is operatively connected to the valve stem and separates a region within the valve casing into a pair of pressure-differential chambers, and a flow passage is formed in the casing communicating one pressure-differential chamber with the inlet chamber, the other pressure-differential chamber communicating with the downstream side of the valve port.

Abstract: An improved self-actuated constant flow rate regulator system is described which can keep the rate of flow of fluid through a filter or other variable load constant within close limits. One application for this invention is for sampling the air for toxic dusts in factories where it is desirable to draw air through a collecting filter at a preset rate regardless of the amount of deposit on the filter and where a number of such filters may be connected to a central vacuum pump. The system comprises a differential pressure regulator and an adjustable metering orifice working in conjunction with each other. The regulator senses the pressure drop across the orifice and governs the flow rate accordingly. Details of the regulator valve and of the metering orifice are set forth which contribute to improved operating performance and manufacturing efficiency.

Abstract: A hydraulic system for raising and lowering a load by means of a fluid motor includes a counterbalance valve which controls the flow of fluid to and from the motor. The counterbalance valve has a pilot operated metering orifice which passes fluid from the motor when the load is lowered and a compensator valve which maintains a fixed pressure differential across the metering orifice. This results in a fixed flow of fluid through the metering orifice when the load is lowered.

Abstract: There is provided a fluid flow control unit adapted to be connected to a source of fluid under pressure. The unit comprises a housing having an input port and an output port and a body suspended in said housing by means of a diaphragm dividing said housing into an input chamber and an output chamber wherein said body is movable in relation to said ports under the influence of the fluid pressure differential between said input chamber and said output chamber for variably restricting said output port under the displacement of said body toward said output port. There is further provided resilient means for biasing said body toward said input port and at least one passageway formed in said body and passing therethrough for fluid communication between said input and output chambers via said body, the dimensions of which passageway remain unchanged during operation.

Abstract: The stackable modular element for a flow divider unit for a hydraulic circuit has a flow regulator with a piston controlling an opening as a function of the variations in the pressure upstream between the fluid input and output. The internal cylinder of the regulator piston (11, 111, 211) opens, on the one hand, onto a stacking face of the element and, on the other, into the exit hole (5, 105, 205) of the element, passing through its entry hole (3, 103, 203) and communicates, via the said stacking face, with a passage (12, 112, 212) for equalization of output pressures traversing the element between its stacking faces and connecting them with the corresponding passages in the adjoining units, the equalization passage communicating, in addition, with the exit hole (5, 105, 205) of the element.

Abstract: In-line flow regulator for use in hydraulic flow systems is presented using a fixed size orifice which may be manually adjustable by blocking off a part of the orifice to provide an exact rate of flow in the regulated flow direction and which otherwise provides a free flow in the reverse direction.

Abstract: An automatic fluid control valve for maintaining a substantially constant fluid flow includes a valve stem movable linearly within a casing and having valve means thereon cooperable with a valve port to regulate the flow of fluids therethrough in response to changes in fluid pressure differential, diaphragm means operatively connected to the valve stem and separating a region within the valve casing into a pair of pressure-differential chambers, a fluids passageway of variable cross-sectional area settable to establish a predetermined fluid flow rate through the control valve located intermediate the fluid inlet and the outlet and thereby establishing first and second fluid pressures respectively on the upstream and downstream sides of the fluids passageway, and means communicating the fluid pressure on the upstream side of the fluids passageway to one of the pressure differential chambers and the fluid pressure on the downstream side of the fluids passageway to the other of the pressure differential chambers

Abstract: A diaphragm valve which may serve as an equal pressure valve or as a pressure equalizing valve of a fuel metering and distributing unit for an externally ignited internal combustion engine. The valve has a flexible diaphragm the diameter of which is clamped between the housing and a bottom plate. Included is an adjusting device for controlling tension of a spring that encompasses the stem of the valve with the lower surface of the spring arranged to rest on the upper surface of the diaphragm. The adjusting device is disposed at an angle relative to the valve axis and engages the rim of a plate that is chamfered to correspond to the inclination of the adjusting member. By means of the adjusting device, the spring plate can be minutely adjusted in its axial position thereby changing the valve spring tension.

Abstract: A fluid manifolding system. A main flow line is connected to a plurality of branch flow lines. Adjustable control means are connected to each branch point to control the flow in that branch line independently of the pressure drop in that branch line and independently of the hydrostatic pressure in the main flow line at that branch point. The control means consists of a fixed constriction in each branch flow line and an automatic valve in each branch flow line responsive to the pressure drop across the fixed constriction and which may be biased by a force to maintain a fixed preassigned pressure drop across the fixed constriction.

Abstract: A multi-stage compressor has a trap between adjacent stages to collect moisture from the compressed air passing from the exit of one compression stage to the entrance of the next compression stage. Each of the traps communicates with the next of the preceding traps through a bleed valve whereby moisture passes from one trap to another without having any effect on the substantial pressure differential between the two traps. The bleed valve has a diaphragm within a housing to divide the housing into first and second chambers with the first chamber communicating with the high pressure side trap and the second chamber communicating with the low pressure side trap. The flow from the high pressure side trap to the first chamber and the second chamber is controlled so that a predetermined pressure differential of one p.s.i. is maintained across the diaphragm.

Abstract: A ramjet fuel control system that provides a regulated fuel pressure of a predetermined differential between the fuel pump pressure and the inlet pressure to a metering valve. The differential regulator uses a spool valve and sleeve in which the sleeve has ports positioned to prevent hydrodynamic flow force while the sleeve metering valve spool has rectangular ports so that the metering area which is uncovered by the spool is linearly related to the stroke of the valve spool.