Abstract: A fluid flow control valve having a plug opening with a plug having a central passage for discharging fluid from the controller. The plug opening has a smaller cylindrical guide surface, threaded for engaging the plug, and a larger cylindrical guide surface. The plug has similarly shaped surfaces for engaging the guide surfaces of the plug opening to precisely locate the plug with respect to an impeller chamber.

Abstract: A system for controlling fluid flow to an approximate constant rate is disclosed. The system includes a housing, a flow control element, a cutout formed in the flow control element, a valve element, and a spring. The housing has an inlet opening and an outlet opening. The ends are arranged and configured to receive piping. The flow control element is operatively positioned within the housing with the flow control element having an upstream end and a downstream end with a cutout formed therein. The fluid flows in the inlet and through the cutout into a larger chamber within the housing before exiting the outlet end of the housing in normal flow. A valve element is disposed within the housing adjacent and upstream of the flow control element. The valve element is positioned within the housing by a spring means which urges the valve element toward the outlet.

Abstract: A fluid flow control valve and method for operating which maintains the rate of flow of fluid therethrough at a substantially constant rate regardless of variations in pressure of the fluid flowing therethrough.

Abstract: The fluid handling devices are capable of accurately handling substantially continuous fluid flow rates as low as about 0.01 cc/day. The devices are so miniaturized, corrosion-resistant and non-toxic that they are suitable for being implanted in the human body; and are capable of being mass produced at costs so low, by using micromachining techniques, such as etching, that they may be considered to be disposable. The devices are either passive devices which consume no electrical energy at all, or are active devices which consume very small amounts of electrical energy. The devices are reliable because they may have as few as only two parts, only one which is a moving part; and because they may handle fluids at very low pressures. The fluid handling devices include active piezoelectrically driven membrane pumps; and passive fluid flow regulators, on-off valves, flow switches and filters.

Abstract: A fluid-flow controller having an internal impeller. The impeller is reciprocally mounted within an orifice sleeve and has a peripheral surface engaging the sleeve forming a segment of an imaginary spherical surface.

Abstract: A water-operated hydraulic control valve is disclosed, having a throttling device which comprises a throttling element (20) which is in the form of a piston which cooperates with a substantially hollow-cylindrical counter-element (8).In order also to be able to operate such a control valve with water, that is, a non-lubricating fluid of low boiling point, the throttling element (20) projects with one end (29) into the counter-element (8). Distributed in the circumferential direction, several apertures (30) are provided in the throttling element (20) or in the counter-element (8), forming a flow path through the overlap region between throttling element (20) and counter-element (8), and distributed in the circumferential direction there is provided an arrangement of pressure pockets (33), which arrangement is in fluid connection with the apertures (30) and is arranged at least partially in the overlap region.

Abstract: A flow regulating valve combines two throttle locations in a valve housing. One throttle location is always so adjusted that a constant differential pressure prevails across the other throttle location. Therefore at that second throttle location the through flow depends only on the degree of opening and not on the differential pressure. A cone of the second throttle location comprises at least two individual portions which are displaceable relative to each other and by the spacing of which the effective cross-section of the throttle location is variable. That provides a through-flow limiting effect which is not in the form of a stroke movement limitation. Therefore the full adjusting range is available for adjusting the flow. This flow regulating valve is suitable for controlling flows of liquids in heating solutions.

Abstract: A cleaning apparatus (10) for removing residual paint from flow passages in a spray painting system comprises a flow passage (12) for conveying paint to a spraying device (14) and a manifold (16) defining a plurality of individual inlets (17) into the flow passage. At least two different paints are supplied to the manifold through the inlets. A solvent supplier (20) supplies a variable pressure and variable volume flow of solvent to the manifold (16) during a cleaning cycle to remove residual paint from the manifold and the flow passage (12) after a completed painting cycle to prepare for a new cycle. The assembly is characterized by including a constant volume flow controller (22) for maintaining a constant volume flow of solvent upstream of the manifold (16) independent of solvent pressure fluctuations.

Abstract: To control the flow of air into andr out of a process chamber, such as a clean room, a two-stage system is disposed within each of several parallel conduits leading into and/or out of the process-chamber. One stage includes a regulator, having a plenum disposed between the environment and the vacuum source. The regulator maintains in the plenum a pressure that is between the pressures of the environment and the vacuum source and that is a constant amount different from the environment's pressure. The regulator includes a piston having a frontal face exposed to air in the plenum flowing between the environment and the vacuum source, and a distal face exposed to the environment's pressure. The piston is mounted so as to variably impede the flow of air through the regulator and so that the weight of the piston tends to move the piston in a direction so as to lessen the piston's impedance on the air flow.

Abstract: A control valve is disclosed, having a housing which has an input port and an output port that are connected to one another by a flow path in which a throttling device is arranged. It is desirable for such a control valve to be able to hold a volume flow constant, irrespective of the load pressure at the output port. For that purpose, the throttling device comprises a series connection of a first throttle, the passage of which is externally adjustable, and a second throttle, the passage of which is adjustable in dependence on pressure.

Abstract: The present invention relates to a controllable constant flow regulating lift valve of a direct-acting automat ic control type that operates on an operating force derived from the condition of a working fluid, such as valve-inlet pressure prevailing in the inlet passage, valve-outlet pressure prevailing in the outlet passage, variation of liquid level on the side of the outlet and so on. The flow regulating valve comprises a flow regulating valve structure and a slide valve structure for automatic flow restriction control. In the controllable constant flow regulating lift valve, axial thrust acting on the spindle of a lift valve type flow regulating valve structure is balanced such that the constant flow regulating lift valve can be operated for constant flow regulation by a very small power.

Abstract: A flow control valve assembly has a high degree of liquid-tightness and good flow controllability, even if a high-pressure, low-viscosity fluid is used. A housing of the valve assembly is formed with an inlet port and an outlet port, and a spool inserted in the housing. First and second fluid chambers for applying fluid pressures on both ends of the spool communicate with each other through a fluid passage having an orifice. The opening of the valve portion is adjusted by the movement of the spool so that the spool driving force produced by the difference in the pressures applied to both ends of the spool balances with a biasing force, whereby a fluid flows through the orifice at a controlled rate. This control valve assembly has an elastic annular seal. When the spool moves toward the annular seal, the land portion on the spool outer periphery is adapted to butt the seal, thereby closing the fluid passage. In this closed state, fluid leakage is reduced substantially to zero.

Abstract: To control the flow of air into and/or out of a process chamber, such as a clean room, a two-stage system is disposed in conduits leading into and/or out of the process-chamber. One stage includes a regulator, having a plenum (7) disposed between the environment the vacuum source. The regulator maintains in the plenum a pressure that is between the pressures of the environment and the source and that is a constant amount different from the environment's pressure. The regulator includes a piston (5) having a frontal face (52) exposed to air in the plenum flowing between the environment and the vacuum source, and a distal face (51) exposed to the environment's pressure. The piston is mounted so as to variably impede the flow of air through the regulator and so that the weight of the piston tends to move the piston in a direction so as to lessen the piston's impedance on the air flow.

Abstract: A constant flow rate controller valve includes a piston spring biased towards the top of the valve. Fluid or gas flowing into the valve increases the forces in the chamber above the piston, forcing the piston toward a valve seat. The piston is thus seated in the valve seat, blocking gas or fluid flow to the outlet port. The forces on the piston in the chamber below the piston builds as flow goes through the piston until the forces in this chamber including the piston spring force is greater than the forces in the chamber above the piston. The piston then is lifted from the valve seat, and the pathway to the outlet orifice is opened. At equilibrium, fluid or gas flows through or around the piston via the variable orifice.

Abstract: Water pressure in various branches of an irrigation system is controlled by incorporating a butterfly valve in each branch. Each valve is connected to its own piston-cylinder hydraulic assembly. Elongation of the assembly urges the valve toward closure. Shortening of the assembly urges the valve toward opening. A spring operatively associated with the assembly urges the assembly to shorten itself. A tube conveys actuating fluid, i.e., water, into the assembly from the conduit downstream from the valve in opposition to the force of the spring. Whenever the downstream pressure exceeds a predetermined pressure, the actuating fluid overcomes the force of the spring and elongates the assembly thereby moving the valve toward closure. This causes the valve to obstruct the flow of water, thereby returning the downstream pressure to the predetermined magnitude.

Abstract: A flow control valve assembly has a high degree of liquid-tightness and good flow controllability, even if a high-pressure, low-viscosity fluid is used. A housing of the valve assembly is formed with an inlet port and an outlet port, and a spool inserted in the housing. First and second fluid chambers for applying fluid pressures on both ends of the spool communicate with each other through a fluid passage having an orifice. The opening of the valve portion is adjusted by the movement of the spool so that the spool driving force produced by the difference in the pressures applied to both ends of the spool balances with a biasing force, whereby a fluid flows through the orifice at a controlled rate. This control valve assembly has an elastic annular seal. When the spool moves toward the annular seal, the land portion on the spool outer periphery is adapted to butt the seal, thereby closing the fluid passage. In this closed state, fluid leakage is reduced substantially to zero.

Abstract: A constant flow rate controller valve includes a piston spring biased towards the top of the valve. Fluid or gas flowing into the valve increases the forces in the chamber above the piston, forcing the piston toward a valve seat. The piston is thus seated in the valve seat, blocking gas or fluid flow to the outlet port. The forces on the piston in the chamber below the piston builds as flow goes through the piston until the forces in this chamber including the piston spring force is greater than the forces in the chamber above the piston. The piston then is lifted from the valve seat, and the pathway to the outlet orifice is opened. At equilibrium, fluid or gas flows through or around the piston via the variable orifice.

Abstract: To control the flow of air into and/or out of a process chamber, such as a clean room, a two-stage system is disposed in conduits leading into and/or out of the process-chamber. One stage includes a regulator, having a plenum (7, 79) disposed between the environment and the air source or the vacuum source. The regulator maintains in the plenum a pressure that is between the pressures of the environment and the source and that is a constant amount different from the environment's pressure. The regulator includes a piston (5) having a frontal face (52) exposed to air in the plenum flowing between the environment and the source, and a distal face (51) exposed to the environment's pressure. The piston is mounted so as to variably impede the flow of air through the regulator and so that the weight of the piston tends to move the piston in a direction so as to lessen the piston's impedance on the air flow.

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: In a fluid flow emergency shutdown valve a valve body is transversely interposed in a fluid line upstream with respect to a flow restricting unit, A valve stem is longitudinally slidably supported by the valve body and referenced to atmosphere at its respective ends, The valve stem supports a valve normally disposed upstream with respect to its seat. The other end portion of the valve stem supports a piston fluid pressure balanced by downstream fluid pressure from the outlet port of the flow restricting unit in combination with the buckling point value of a collapsible pin axially abutting the downstream end of the valve stem, A decrease in downstream fluid pressure below a predetermined value increases the pressure differential across the piston from its upstream to its downstream side which moves the piston to buckle the collapsible pin and move the valve to a closed position.

Abstract: An adjustable-rate flow regulator, including a split housing having an inverted-cup-shaped upper half connectable to a source of liquid to be dispensed, the upper half having a wall and a downward-facing bottom surface provided with an inlet port, and a lower half rotatably engaging the upper half, the lower half having a neck portion of reduced diameter and a recessed upper face having, at the bottom thereof, a control port leading to the consumer of the liquid. The regulator further includes an elastically deformable diaphragm seated on an annular step in the recess and defining with the bottom surface of the upper housing half a first chamber, and with the bottom of the recess in the lower housing half, a second chamber, and a tubular flow attentuator made of an elastomer, rotatably seated on, and fluid-tightly surrounding, the neck portion of the lower housing half, but non-rotatable relative to the upper housing half.

Abstract: A fluid flow device for minimizing the effects of fluctuating pressures on the fluid flow rate has a variable restriction in the fluid path through the device arranged to produce a lesser restriction as the pressure difference between the inlet and outlet of the device increases, and vice versa. This first, variable restriction is formed by an inlet tube and a blocking member. A second, constant restriction for the fluid flow is formed by the tube and a parallel bore through which the tube extends, to produce a pressure drop which creates a pressure differential across a diaphragm balanced by a spring. A change of the pressure differential across the device also changes the pressure differential on the diaphragm, which is connected to the blocking member, so that movement of the diaphragm has the effect of varying the restriction in the manner described to reduce flow rate variations through the device.

Abstract: There is disclosed a system for delivering gas at a predetermined rate of flow, including a diaphgram type flow controller, a pressure regulator for providing a constant flow of gas to the flow controller, and a microprocessor controlled stepper motor utilizing an optical encoder to adjust the rate of flow of a gas leaving the controller without having to use a gas flow measurement device to monitor the flow rate.

Abstract: A regulator, which may be used to regulate in a remote region a constant partial vacuum. The regulator controls the flow of gas from an environment, through a region and to an evacuation means. The regulator's fluid path is bounded on opposite sides by two plates, which may be hingedly mounted, so that the two plates are substantially parallel to each other. Each of the plates have a conduit side, facing the fluid path, and a side facing a reference pressure. The first plate's reference-pressure side may be exposed to the region's pressure, and the second plate's reference-pressure side may be exposed to the environment's pressure. The regulator also includes an impeder attached to the plates for variably impeding the flow through the path based on the position of the plates. Preferably, the impeder includes a fixed grate and a movable grate. The fixed grate does not move with respect to the path. The movable grate is hingedly attached to the plates at points distal from the pivot points.

Abstract: This invention is intended to control the flow rate and pressure in a valve body by operating a throttling valve connected to the opening of the valve body by a remote pipe. The construction of the control valve is as follows: A spool type pressure compensated control valve 3 is installed on the upstream side of a flow passage of the valve body having an inlet 2 and an outlet 5, and a variable orifice 3' is formed on the pressure compensated control valve 3. On the downstream of the pressure compensated control valve 3 is installed a flow control throttling valve 4, which is urged by a spring 7 in the direction of closing the flow passage. The spring chamber 12' of the flow control throttling valve 4 is connected to the outlet 5 through a central passage 12 in the throttling valve 4. A chamber 20 at the other end of the flow control throttling valve 4 is connected to the inlet 2 via a variable throttle 16, and is also open to the outside of the valve body.

Abstract: A device is provided for regulating the flow of fluid from a source and may be used with an air filter of the type found in clean rooms and the like. The device includes an impeder, movably mounted proximate to the input, for variably impeding fluid flowing from the source, and a movably mounted piston having a distal face, exposed to a reference pressure, such as the pressure of the clean room, and a frontal face, exposed to fluid downstream from the impeder. The impeder and the piston are attached to each other, so that an increase in pressure on the distal face of the piston tends to lessen the impedance on the fluid flow, and an increase in pressure on the frontal face of the piston tends to increase the impedance on the fluid flow. A force is exerted on the impeder and the piston so as to tend to cause the impeder to lessen the impedance on the fluid flow; this force may be the weight of the impeder and the piston, as well as any member that connects them.

Abstract: To control the flow of air into and/or out of a process chamber, such as a clean room, a two-stage system is disposed in conduits leading into and/or out of the process-chamber. One stage includes a regulator, which has a plenum disposed between the environment and the air source or the vacuum source. The regulator maintains in the plenum a pressure that is between the pressures of the environment and the source and that is a constant amount different from the environment's pressure. The regulator includes a piston having a frontal face exposed to air in the plenum flowing between the environment and the source, and a distal face exposed to the environment's pressure. In some embodiments, a gate is attached to the piston. Either the gate or the piston is mounted so as to variably impede the flow of air through the regulator and so that the weight of the piston tends to move the piston in a direction so as to lessen the impedance on the air flow.

Abstract: Adjustable flow control valves are disclosed for controlling the flow of syrups and diluents at a corresponding predetermined constant flow rate regardless of the pressure of the fluid being controlled. The valves include a cylinder and piston assembly in which the piston has an inlet orifice and controls outlet ports from the cylinder to maintain a constant flow rate. Dual spring arrangements provide for adjusting the range of flow rates which the valve can accommodate in connection with varying pressure and varying viscosity of the liquid being controlled, and variable piston orifice arrangements are disclosed for the same purpose. An improved cylinder construction comprising sleeve and bonnet components is disclosed and provides for the outlet ports from the cylinder to be provided in the bonnet component.

Abstract: A regulator including a movably, preferably hingedly, mounted member having a distal face, exposed to a reference pressure, and a frontal face, exposed to fluid passing through the regulator. Attached to the member is a structure that variably impedes fluid flowing through the regulator. The amount that this structure impedes the fluid flow varies as a function of the difference between the pressure of fluid on the frontal face of the member and the reference pressure. The impeder may be an integral part of the piston extending into the path of the fluid flowing through the regulator, or it may be a separate structure attached to the piston. In one embodiment, this impeder includes segmented airfoils segment. Some airfoil segments are movable and attached to the piston, others are fixed. As the piston moves in response to changes in pressure differential across the piston, each movable segment is displaced with respect to its corresponding fixed segment.

Abstract: A fluid flow regulator has a housing with a cylindrical chamber. A member in the form of a ball having a diameter slightly less than the diameter of the chamber can move within the chamber. In one embodiment, a bypass channel in the chamber extends around the ball. Fluid flow in the inlet passes through the orifice created between the ball and the channel, creating a pressure drop so that the fluid on the inlet side of the ball is at a higher pressure than the fluid on the other side. The resultant pressure force urges the ball against a spring. Fluid on the other side of the ball exits the chamber through a radial outlet slot positioned near the ball. When the inlet pressure and flow increases, the ball moves toward the outlet slot to cover a greater percentage of the outlet slot, which raises the pressure drop into the outlet, thereby compensating for the increased inlet pressure. A second longitudinal channel terminates on the downstream side of the ball.

Abstract: A pressure compensator for maintaining essentially constant flow rates in an IV system having a source of IV fluid and a controller. The compensator is connectable to the controller and has a housing with a flexible membrane extending transversely therein defining opposite control chambers. One control chamber communicates with the source of IV fluid and also connects the inlet of the flow controller. The second control chamber receives the regulated flow from the control valve. The second control chamber is generally conical or convex sloping to an outlet port which is connected to the tubing line leading to the patient. The outlet from the second chamber is smaller than the inlet to the second chamber and the diaphragm serves to control the flow to the patient compensating for pressure changes such as a change in fluid head. The configuration of the second chamber and the configuratoin of the outlet in the second chamber minimize air entrapment and provide greater flow capacity.

Abstract: A substantially constant flow regulating valve includes a piston dividing a bore into two chambers. The piston is spring biased toward the top chamber of the bore. Fluid from the inlet enters the top chamber through a reference pressure passage and exerts a downward force on the piston. Fluid from the inlet also passes through an inlet flow throttle and into the bottom chamber of the bore where it exerts an upward force on the piston in concert with the spring force. The piston includes an end which variably interacts with an orifice in the lower chamber to maintain a constant pressure differential between the top and bottom chambers.

Abstract: A flow control apparatus is disclosed which includes a housing, a cylinder disposed in the housing and a spool disposed in the cylinder while being urged in one direction along the axial direction of the cylinder. The spool slides along the axial direction against the urging force, to adjust the flow quantity of a fluid. A stopper is disposed in the housing for restricting the range of the sliding movement of the spool toward the urging direction. A pair of engaging projections are disposed on the peripheral wall of either the housing and the stopper and are separated from each other by substantially 180 degrees, and an engaging hole disposed in the other of the peripheral wall and the stopper so as to engage at least one of the engaging projections. This at least one projection is engaging with the engaging hole by the urging force acting on the spool, to attach the stopper to the housing.

Abstract: The differential-pressure-sensing and variable-area-occluding fundtions within variable-area flowmeters and flow regulators are performed by separate, but mechanically connected, elements. A housing defines a channel for guiding fluid flow from an upstream to a downstream location. A differential pressure sensor moves in a direction substantially perpendicular to the direction of fluid flow in response to a differential fluid pressure between the upstream and downstream locations. Because the movement of the pressure sensor is substantially perpendicular to the flowing fluid with which it comes in contact, it is substantially insensitive to fluid friction and to changes in fluid viscosity. A flow obstructor connects to the sensor and moves therewith to variably obstruct the channel and its flow of fluid from the upstream to the downstream location. Fluid frictional forces on the movement of the flow obstructor vary with changes in fluid viscosity.

Abstract: An extended fire-extinguishing discharge system discharges a fire-extinguishing material at a predetermined mass flow rate. The extended discharge system includes an extended discharge container filled with a fire-extinguishing material, at least one discharge nozzle connected with the extended discharge container for discharging the fire-extinguishing material into a protected space, and a variable pressure controller interconnected between the container and the discharge nozzle. The fire extinguishing material flows through the variable pressure controller which produces a regulated pressure as a function of the inlet pressure to the variable pressure controller. By varying the regulated pressure, the extended discharge system of the present invention is able to maintain a mass flow rate within a predetermined optimum range at any temperature of the fire-extinguishing material.

Abstract: A flow control valve includes a sleeve formed with an inlet port and an outlet port and a spool slidably mounted in the sleeve. A fluid passage having an orifice connects a high-pressure end and a low-pressure end of the spool. An annular seal is liquid-tightly fitted in an annular groove formed in the inner periphery of the sleeve and extends into an annular groove formed in the outer periphery of the spool with a gap left therebetween. A biasing elements is provided to bias the spool in a direction opposite to the direction in which the fluid pressure differential between both ends of the spool tends to urge the spool. A seal can be effected by the annular seal and a shoulder portion of the spool defining the annular groove thereof. The seal, however allows fluid communication from the inlet port toward the outlet port through the orifice to be established with the movement of the spool.

Abstract: A fluid-operated valve includes a control spool, actuated by a source of pilot pressure to control a pilot flow of fluid from a loading pressure inlet port to a drain line. The pilot flow passes a throttle which reduces the fluid pressure acting in one direction, thereby performing stroke compensation of the actuation of a valve poppet. A differential pressure compensation valve is moved to partially block fluid flow to a rate control orifice group in response to a difference in pressure on the two sides of the rate control orifice group to control further the actuation of the valve poppet, whereby differential pressure is compensated.

Abstract: A substantially constant flow regulating valve includes a piston dividing a bore into two chambers. The piston is spring biased toward the top chamber of the bore. Fluid from the inlet enters the top chamber through a reference pressure passage and exerts a downward force on the piston. Fluid from the inlet also passes through a low torque inlet flow throttle and into the bottom chamber of the bore where it exerts an upward force on the piston in concert with the spring force. The piston includes an end which variably interacts with an orifice in the lower chamber to maintain a constant pressure differential between the top and bottom chambers. A coil-type piping system, a diversifying campus-type piping system and a pressure source piping system all include the above described flow regulating valve. None of these systems require balancing valves or differential pressure valves when the flow regulating valve is employed.

Abstract: A load-referenced, pressure reducing valve, and a system which incorporates one or more of such valves provide needed response to rapidly changing hydraulic system load demands which are experienced with automatic control systems. The valve provides rapid response for pressure regulation by providing the load pressure to one side of the valve so that immediate, load referenced valve adjustment occurs instantly upon change of load conditions at a system load, and pressure regulation begins immediately without need for fluid flow.

Abstract: A dual-diaphragm, adjustable-rate, pressure-compensated infusion regulator includes a housing having inlet and outlet ports and an intermediate member, and a flexible main diaphragm retained along a peripheral portion thereof in the intermediate member. The regulator further includes a flow-regulating valve consisting of a valve head accessible to a high-pressure source and a valve stem which is attached to the valve head, and a flow-attenuating element of adjustable attenuating effect. A flexible auxiliary diaphragm is retained along a peripheral portion thereof in a high-pressure region and incorporates a valve seat for the valve head, 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 inlet chamber.

Abstract: The valve comprises a shutter (11) which cooperates with a seat (12), and a spring (13) tending to press the shutter onto the seat, so as to limit the flow rate of a hydraulic fluid passing through the valve. In order to vary the force exerted by the spring (13) on the shutter (11) as a function of the flow rate through the valve, the latter comprises a movable piston (14) on which the spring (13) bears, the movable piston being displaced in a cylinder (15) which it separates into two chambers (15a, 15b). One of these chambers is in communication with the hydraulic fluid downstream or upstream of the valve, the other chamber being in communication with an intermediate space (23) whose shutter (11) constitutes a first passage orifice and which is equipped, at a second passage orifice (24), with a restriction (25) defining a pressure drop which increases with the flow rate passing through it.

Abstract: A disc orifice valve for providing a constant volume of fluid flowing through a high pressure fluid line is formed by a valve body having in-line inlet and outlet ports. Dual bores in the valve body transversely intersecting the fluid flow passageway between the inlet and outlet ports respectively receive multiple orifice discs for controlling the volume of fluid entering the valve and a poppet valve assembly controlled by a diaphragm fluid pressure balanced on its opposite sides maintaining the poppet valve in an open position in accordance with the volume of fluid at the inlet port and biased open by spring pressure.

Abstract: A low-output flow regulator, including a housing, having an inlet aperture through which a liquid from a liquid source may enter, the inlet aperture is adapted to at least indirectly communicate with a consumer of the liquid, the housing comprises a raised portion with a recessed top surface provided with an opening leading at least indirectly to the consumer, and the raised portion has a circumferential wall surface projecting into the housing. The regulator further includes a cup-shaped elastomeric diaphragm consisting of a relatively thin and, in its position of rest, substantially plane active portion, and an annular wall portion integral with the active portion.

Abstract: A lubricant supply limiting device (1') for a lubrication system, wherein at least one fixed throttle (F) and a servo pressure controller (3) provided with a variable throttle (D) are disposed in the flow path, and wherein an adjustment member (6') for the variable throttle (D) is subjected to the resilient action of an actuator, is provided with a proportional solenoid (15) acting as the actuator for selectively adjusting the lubricant flow to the demand at specified lubrication points. A proportional solenoid (15) is moreover advantageous for general use in servo pressure controllers to act on the adjustment member thereof in a manner permitting the pressure differential maintained by the servo pressure controller and determined by a fixed throttle to be varied.

Abstract: A vehicle power assisted steering system comprises a hydraulic pump 24 having a constant volume output communicating with an open center power assistance valve 40 which is adjustable from a neutral condition in response to a steering input torque during a steering maneuver to control fluid flow from the pump to opposed chambers of a ram 18b providing power assistance to assist the steering maneuver. A by-pass valve 25 communicates between the outlet of the pump 24 and a fluid reservoir 21 and is responsive to vehicle speed to increasingly open communication between the pump 24 and the reservoir 21 as vehicle speed increases and conversely. The valve 40 has valve members displaceable from a neutral condition in response to a steering input torque to direct hydraulic fluid to actuate the ram 18b for power assistance. In the neutral condition of the valve members, they provide intercommunication between the pump 24, the chambers 18a of the ram and the reservoir 21.

Abstract: The modulator is intended for diverting a specific quantity of fluid under high pressure from the supply circuit of a hydraulic motor for a power-steering of motor vehicles, comprising a body (48), a bore (50) in the body, a modulator slide (52) movable axially in the bore under the action of a control member (98), an inlet orifice (58) and a fluid outlet port (60) opening into the bore (50). The slide (52) has first and second bearing surfaces (82, 84) substantially of the diameter of the bore and separated by means of a narrowed section (86), opposite which the inlet orifice (58) opens out, the second bearing surface (84) controlling the outlet port (60). Furthermore, the slide (52) defines a first chamber arranged between the first and second bearing surfaces (82, 84) and second and third chambers arranged on either side of the slide (52) and communicating with one another.

Abstract: An improved surface controlled chemical injection valve and method for injecting chemical fluid into the bore of a tubing string of a well are provided, the chemical injection valve having at least one piston movable in response to the pressure of the chemical fluid, an actuator connected to the piston, and a flow restrictor wherein the pressure of the chemical fluid supplied to the valve from the chemical fluid source acts on the piston to cause the actuator to open the valve and inject the chemical fluid into the tubing string bore. The flow restrictor is mounted downstream of the piston to create sufficient available pressure in the chemical fluid upstream of the flow restrictor to act on the piston and hold the valve in the open position.

Abstract: A two-way flow control valve has an independent adjustment for the volume of a throughput fluid flow and a pick-up of the pressure at the entrance or inlet of the valve. This fluid pressure generates at least one force component acting on a correcting element, opposing the effective force of an accumulator and opposing the effective force of the fluid pressure generated at the outlet of the valve. With the correcting element, the volume of throughput fluid flow can be controlled at the outlet of the valve.

Abstract: A metering valve (10) having a bi-directional motor (11) with a linearly-displaceable output shaft (21) in which the shaft (21) is separated from but cooperates with a bi-directionally movable piston (16) to provide a variable flow aperture (102) in a secondary flow path (12,52,74,78,76,102,100,48) extending axially through the piston (16). Flow along a primary flow path (12,18,48,14) is varied by movement of the piston (16) in response to an imbalance of opposing hydraulic forces. The imbalance in forces results from varying the foresaid flow aperture (102) by displacing the output shaft (21). However, the flow aperture (102) is only transitorily varied by displacement of the shaft (21) since the valve (10) is designed to provide a follow-up servo function by which the piston (16) is kept at a substantially constant distance from the shaft (21).

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 applications wherein leakage flow is of greater significance.