Abstract: Methods and devices for accurately pumping small quantities of liquid to a patient with a broad range of flow and low cost.

Abstract: A breather includes a case, which has an internal space, an insertion portion, and a valve structure. The insertion portion includes a connecting passage that connects the internal space and an external space. The valve structure includes a valve member in the connecting passage, a locking portion that restricts displacement of the valve member, and a spring that presses the valve member against the locking portion. The insertion portion includes a seating portion that is inclined such that the connecting passage narrows as the distance from the locking portion increases. The valve member includes a plate portion, and a ventilating portion that is a radially inward recess on the edge of the plate portion. The valve structure connects the external space and the internal space to each other via the ventilating portion in a state in which the valve member is in contact with the seating portion.

Abstract: An integrated variable pressure and flow regulator comprising a manifold body, a pressure regulator, a flow control valve, a flow meter and a flow diverter. The manifold body includes a coupling face to which the pressure regulator is attached, a flow control valve cavity which receives the flow control valve, a flow meter cavity which receives the flow meter and a flow diverter cavity which receives the flow diverter. A central fluid transfer passageway of the manifold connects an inlet with outlet ports in fluid communication through the cavities. The pressure regulator maintains an outlet fluid pressure less than inlet fluid pressure as per a reducer pressure at outlet ports. The flow control valve maintains an outlet fluid flow rate, as per a flow rate setting, for the fluid flow at the outlet fluid pressure. The flow diverter allows to selectively divert the fluid through any of the outlet ports.

Abstract: A servo valve for an actuator comprises a housing, a sleeve provided within the housing comprising an axis (A) and having a plurality of metering holes for communication with a cavity within. A metering rod extends within the cavity for metering flow of pneumatic fluid through the metering holes. The metering rod is coupled to a drive unit for axial movement within the cavity, the drive unit comprising a drive unit housing, a solenoid and an adjustable core. The adjustable core comprises a threaded first portion having a thread and a second portion. The thread of the first portion engages a thread extending through the drive unit housing for adjustment of the relative position of the adjustable core with respect to the solenoid.

Abstract: A valve according to an example of the present disclosure includes a poppet head configured to move with respect to a valve outlet of the valve. A first spring is configured to be compressed with a force generated by fluid flow through the valve, and compression of the first spring allows the poppet head to move towards the valve outlet. A second spring is configured to allow the poppet head to move toward the valve outlet when compressed. A method for controlling fluid flow is also disclosed.

Abstract: A pneumatic timing valve includes a spool and seal system having a first seal cartridge and a spool. The first seal cartridge has an annular body with radial ports. The spool is positioned within the first seal cartridge and movable between a first and second position. The spool has a central bore and radial ports that intersect the central bore. The radial ports of the spool complement the radial ports of the seal cartridge. The seal cartridge radial ports, the spool radial ports, and the central bore of the spool define fluid flow passages.

Abstract: A front bicycle suspension assembly having an inertia valve is described. The front bicycle suspension assembly may include at least upper and lower telescoping tubes and include a damping tube containing an inertia valve. The inertia valve may include an inertia mass movable along the outer surface of a valve shaft as the inertia valve moves between first and second positions.

Abstract: A dispenser for a refrigerator appliance includes a liquid outlet conduit that extends from a tank. An air conduit extends to the liquid outlet conduit, and an air pump is coupled to the air conduit. The air pump is configured for selectively pumping air into a flow of liquid in the liquid outlet conduit. A related method for operating a dispenser of a refrigerator appliance is also provided.

Abstract: A photostructurable ceramic is processed using photostructuring process steps for embedding devices within a photostructurable ceramic volume, the devices may include one or more of chemical, mechanical, electronic, electromagnetic, optical, and acoustic devices, all made in part by creating device material within the ceramic or by disposing a device material through surface ports of the ceramic volume, with the devices being interconnected using internal connections and surface interfaces.

Abstract: Valve trim for a valve includes a valve plug having one or more balance ports located along the outer surface of a tapered nose portion of the valve plug. Each balance port is located to be downstream of the throat and spaced from the tip of the tapered nose portion of the valve plug. The valve trim may be use, for example, in a high recovery angle body valve. A high recovery valve with the valve trim may have better recovery performance as well as a smaller spike in stem force through the choked flow transition point. A method of reducing stem forces on a valve stem of sliding stem valve is also provided.

Abstract: A modular in-line drip emitter may include a flow restrictor and a replaceable attachment. The flow restrictor may provide fluid communication between an inlet and a fluid outlet chamber. The flow restrictor may include rate limiting fluid path producing a predefined range of flow rate over a predefined pressure differential range between the fluid inlet and the fluid outlet. The attachment may be sized and shaped to mount to the flow restrictor. In some embodiments the attachment includes an inlet opening oriented for receiving fluid from a conduit and a fluid outlet attachable to the fluid inlet of the flow restrictor. In some embodiments the attachment includes a sleeve fitting into a conduit with an annular outlet chamber attachable to the outlet chamber of the flow restrictor.

Abstract: Exemplary embodiments of the present disclosure are directed to manipulating pressure-related hysteresis in a pressurized flow system by setting the pressure of the system to a predetermined location in the hysteresis band to advantageously minimize an effect of the pressure related hysteresis on the pressure of the system or to advantageously benefit from the effects of the hysteresis on the pressure of the system.

Abstract: A fluid circuit includes a device, a cooler, and a valve. The valve includes a housing, a sealing member, a biasing device, and an actuator. The sealing member moves inside the housing between a first position and a second position. The actuator includes a smart material that is activated when the temperature of a fluid inside the housing exhibiting at least a first temperature, causing the sealing member to move to the second position. The smart material is deactivated when the fluid is a sufficient number of degrees less than the first temperature, causing the sealing member to move to the first position. The fluid flows from the housing to the device and then to the housing when the sealing member is in the first position. The fluid flows from the housing to the cooler and then to the device when the sealing member is in the second position.

Abstract: A film is sandwiched between a first plate and a second plate. Outer convex parts formed on the second plate are formed so that their protrusion height dimension is larger than that of an inner convex part. Each outer convex part is formed so that its width dimension is smaller than the inner convex part. When the first plate and second plate are face-joined together, the film is sandwiched between outer concave parts and the outer convex parts, after which the film is sandwiched between an inner concave part and an inner convex part and a tension is applied to a diaphragm part stretched in concave flow paths.

Abstract: A turbocharger (10) that uses exhaust gas flow to drive a turbine wheel (12) having a barrel or piston-type wastegate valve assembly (26, 126) with a wastegate valve (28, 128) that controls exhaust gas flow bypassing the turbine wheel (12) to control turbine work. A cylinder (30, 130), which may have a through hole (32, 132), is moveable in a tubular chamber (22) and functionally operates with a wastegate port (24) in the turbine housing (20) for controlling exhaust gas flow. An actuator (36, 136) operably controls movement of the cylinder (30, 130).

Abstract: A fluid pressure regulating unit, comprises a fluid inlet port, a fluid outlet port, a valve comprising a movable valve part, wherein the movable part comprises at least one fluid pressure balancing means and wherein the at least one pressure balancing means comprises a tapered surface, and a main valve biasing means. The main valve biasing means biases said valve in the direction of an open position. An auxiliary valve biasing means is provided, biasing the valve in the direction of a closed position. Wherein essentially every surface part, being in fluid connection to the fluid inlet port and having a surface normal at least partially in parallel to the moving direction of the moving part of the valve, is balance by a balancing surface part.

Abstract: The disclosure teaches controlling the fluid flow and pressure, including adjustable pressure regulators, pressure regulators with an inlet restrictor, semi-automatic valve and pressure regulator with a by-pass valve which use one or more of movable shuttle, shuttle housing, a high pressure diaphragm, a low pressure diaphragm and a fluidic conduit connecting the inlet to the outlet. One or more of these implementations adjust to modify the outlet pressure of the regulator. The inlet restrictor allows incoming fluid to enter the pressure regulators when the pressure of the incoming fluid is higher than a threshold level. The semi-automatic valve is opened manually but closes automatically when fluid flowing through the valve is insufficient to keep the valve open. The semi-automatic valve can also be a semi-automatic electrical switch. The by-pass valve directs the flow to bypass the pressure regulator, when the flow is slow or has low pressure.

Abstract: A valve system for an internal combustion engine includes a housing, a drive unit arranged in the housing, at least one valve unit, at least two gas inlet ducts, and a gas outlet duct. The at least one valve unit comprises at least one valve rod, at least one valve closure body, and at least one valve seat. The at least one valve unit is connected to the drive unit. The at least two gas inlet ducts form exactly one of the at least one valve seat which is configured to cooperate with exactly one of the at least one valve closure body.

Abstract: A damped actuator for a fluid regulator includes a diaphragm disposed in a housing, and a damper arranged to stabilize movement of the diaphragm in response to changes in pressure inside the housing. The damper includes a ball check valve arranged to allow air to exhaust out of the housing when above a preselected pressure. The damper may include interchangeable components so as to be modifiable to have different set point pressures to achieve different backpressures inside the housing.

Abstract: A device for the delivery of a liquid in spray form includes a motor (2) connected to a fan (3, 4) adapted to draw a flow of air and send it through at least one conduit (5, 5b), a pre-loading vessel (11) for containing a liquid to be atomized, at least one nozzle (6) located at one end of the conduit (5, 5b) for the delivery of the liquid in spray form, at least one siphoning pipe (14) with one end located inside the pre-charging vessel (11) and an opposing end located in the vicinity of the nozzle (6), and at least one pressure pipe (18) connected to the fan (3, 4) to provide a specific amount of pressurized air to the inside of the pre-charging vessel (11), characterized in having regulating elements (19, 29) adapted to regulate the pressure inside the pre-charging vessel (11).

Abstract: It is proposed to design a fluid flux regulating unit, comprising a first fluid port, a second fluid port and a valve comprising a movable valve part and at least one fluid pressure balancing means, wherein the fluid pressure balancing means comprises a surface in fluid communication with the first fluid port, which has a surface normal vector at least partially in parallel to the moving direction of the movable valve part.

Abstract: A downhole fluid flow control system and method includes a fluid control module having a main fluid pathway, a valve element and a pressure sensing module. The valve element has open and closed positions relative to the main fluid pathway to allow and prevent fluid flow therethrough. The pressure sensing module includes a secondary fluid pathway in parallel with the main fluid pathway having an upstream pressure sensing location and a downstream pressure sensing location with a cross sectional area transition region therebetween. In operation, the valve element moves between open and closed positions responsive to a pressure difference between pressure signals from the upstream and downstream pressure sensing locations. The pressure difference is dependent upon the change in cross sectional area and the viscosity of a fluid flowing through the secondary fluid pathway such that the viscosity is operable to control fluid flow through the main fluid pathway.

Abstract: A flow rate controller is disclosed that maintains constant flow rate with changes in pressure drop across the valve by maintaining a constant pressure drop across a restrictor with the aid of a spring balanced piston that mates a cone to a seat to dissipate the majority of pressure drop across the valve.

Abstract: A compact lubricant injector is disclosed. The injector includes an injector body having an inlet for lubricant under pressure, an outlet, and a measuring chamber for receiving lubricant from the inlet. A piston is movable in the injector body along a first axis through a stroke in the measuring chamber for the discharge of a measured volume of lubricant from the measuring chamber and thence through the outlet. A valve is movable in the injector body along a second axis different from the first axis. The valve is responsive to pressure conditions in the inlet for operation of the injector in a cycles ending in a state for venting the injector to effect recharging of the measuring chamber involving the transmission of lubricant from the inlet to the measuring chamber. A combination of at least one such lubricant injector and a manifold is also disclosed.

Abstract: A balanced pressure regulator includes a valve body having a fluid inlet and a fluid outlet connected by a fluid passageway. A valve seat is disposed within the fluid passageway. A valve plug is at least partially disposed within the fluid passageway, the valve plug interacting with the valve seat to selectively open or close the fluid passageway. A retainer operatively connects the valve plug to a valve stem. A diaphragm separates a chamber from the fluid passageway and a balancing passage fluidly connects the fluid passageway with the chamber. A balancing tube extends outward, away from the retainer, fluidly connecting the fluid passageway with the balancing passage.

Abstract: The invention relates to a pneumatic drive, comprising a pneumatic drive unit (1), which has a piston (3) that can be moved between a first position and a second position. The piston is accelerated and braked by means of compressed air, which is fed to or led away from the pneumatic drive unit by means of valve arrangements (8, 9) having distribution valves (16, 17, 21, 22). In at least one distribution valve (17, 22), a damping throttle (20, 25) is provided, which has a differential pressure piston (28), which can be moved as a function of the compression pressure, whereby the free throttle cross-section (49) through which the compressed air flows can be changed as a function of the compression pressure.

Abstract: A flow control valve has a valve body part which has a pressure differential device part and a valve seat, a first diaphragm which defines first and second chambers, a second diaphragm which defines third and fourth chambers and is provided with a valve element, a first moving part which advances and retracts together with the first diaphragm, and a second moving part which advances and retracts together with the second diaphragm; the second chamber and the fourth chamber form between them a connecting chamber, an intermediate transmission member which transmits movements of the first and second moving parts to each other is arranged, and a pressure differential control valve element which advances and retracts with respect to the pressure differential opening part and a pressure differential control valve element advancing/retracting means for making the pressure differential control valve element advance and retract are provided, and a flow control system using the same.

Abstract: The intention is to provide an actuator which makes it possible to change the opening time and to manually lock the supply of gas. For this purpose, the actuator consists of a housing (9) which is closed by a cover (10). A working diaphragm (8) is clamped between the housing (9) and the cover (10) and subdivides a space enclosed by the housing (9) and the cover (10) into a working pressure chamber (11) and an outlet pressure chamber (13). A lever (15) which is supported on the working diaphragm (8) and acts on a gas valve (2) via a drive plunger (16) is pivotably mounted in the housing (9). The actuator also has an adjustable pressure control valve (6) and a solenoid valve (7). When an inlet pressure line (12) is closed, the solenoid valve (7) opens a connecting channel (28) between the working pressure chamber (11) and the outlet pressure chamber (13). In contrast, in the open position, the inlet pressure line (12) is connected to the working pressure chamber (11) and to the pressure chamber (21).

Abstract: An anchor device is utilized to locate the whipstock both longitudinally and rotationally in order to properly orient the whipstock prior to beginning the sidetrack operation. In order to hydraulically set the slips a hydraulically actuated piston in a hydraulic cylinder is pressurized to overcome a restraint such as a shear pin thereby releasing a spring that drives a second piston to force the slips radially outwards thereby setting the anchor. In certain instances the anchor may also be set down on a rod that is also attached to the hydraulic piston. By setting down on the rod the shear pin is also overcome which also releases the spring.

Abstract: An ambulatory drug infusion system includes a disposable ambulatory infusion pump and a flow regulator for regulating flow of the drug supplied from the disposable ambulatory infusion pump. The flow regulator includes a cylinder assembly of first, second and third cylinders arranged coaxially. The flow regulator includes a continuous spiral or helical liquid-flow channel formed between the first cylinder and the second cylinder fitted into the first cylinder. The regulator includes bypass through-holes in communication with the spiral or helical channel and formed in the second cylinder. The regulator further includes liquid-flow passages formed between the second cylinder and the third cylinder fitted into the second cylinder. The through-holes are in communication with the passages, respectively. One of the passages can be selected to choose a predetermined flow rate. The regulator further includes a diaphragm valve which can regulate fluid communication between the spiral liquid-flow channel and an outlet.

Abstract: A pressure controlling valve includes a slidable spool arranged to be spring loaded towards a neutral position. A first port and a second port are connected to allow a fluid flow through the valve. A first and a second pilot port are connected to a cavity adjacent a respective first and second end surface of the spool. The pilot ports are connected to a fluid conduit on either side of a fluid device causing a pressure drop in the fluid conduit and the fluid device is connected to one of the first or second ports. The spool is displaced against the spring load in response to a pressure difference between the first and the second pilot port, whereby a control surface of the spool is arranged to restrict the fluid flow through the valve when the control surface approaches a central cavity.

Abstract: A valve, preferably of the flow control construction type, has a valve piston or pressure regulator piston mounted in an axially displaceable manner in a valve housing. The valve piston and the valve housing form a damping chamber for the motional damping of the valve piston.

Abstract: A method is provided for controlling the feed of a combustible gas by a valve device placed in a feed pipe which has a gas inlet section and a gas outlet section. The device includes a valve seat in the pipe associated with a membrane-operated plug and a device for returning the plug to a position in which the valve seat is shut off. The method includes the steps of creating a pressure difference in a section of the pipe downstream of the plug with respect to the direction of flow, by a constriction in the pipe having a predetermined cross section, the pressure difference being defined by a first pressure upstream of the constriction and a second pressure downstream of the constriction; collecting the signal formed by the second pressure downstream of the constriction and making the second pressure act on the side of the membrane opposite that on which the first pressure acts; and generating a regulatable load on the membrane of the membrane operating system.

Abstract: A constant-flow valve assembly having a first passageway carrying fluid at a first pressure, a piston chamber, and a second passageway connected to the chamber and carrying fluid at the second pressure. A third passageway carries fluid at a third pressure. An adjustable valve is between the chamber and the third passageway, and an adjustable restrictor is positioned between the first and second passageways. An inlet portion of the restrictor assembly receives fluid at the first pressure and directs the fluid to a restrictor, and outlet portion directs the fluid to the second passageway at the second pressure. The restrictor is movable to adjust the position of entry and exit portions relative to the inlet and outlet portions to adjust a fluid flow rate to the second passageway to adjust the flow rate through the valve assembly.

Abstract: A control valve comprises a valve housing (1) having an inlet side (17) and an outlet side (18). The control valve also has a pressure maintaining arrangement for maintaining a constant differential pressure between the inlet and outlet sides, as well as an amount control arrangement for setting the maximum flow through the valve. A pair of cylinder shells located in the flow path have cooperating recesses which provide an uncovered area forming an opening (25). One cylinder shell is rotatable relative to the other cylinder shell by a rotatable handle (13), whereby a larger or smaller opening (25) between the cooperating cylinder shells may be provided. Both cylinder shells are axially displaceable within a seat hole (8), resulting in an increase or a decrease of the opening (25).

Abstract: A device for regulating the flow in a heating and cooling system. The flow is controlled by a complete valve realized as a combination of a difference pressure valve (5) and a flow controlling valve (6) where the complete valve construction allows flushing of the tube system where the valve is mounted. A first static pressure (P1) in the inlet (2), a second static pressure (P2) in the intermediate chamber (4) and a third static pressure (P3) in the outlet (3) are measured by the measuring nipples (27a, 27b) and the difference between the second and the third static pressures (P2, P3) is adjustable during operation.

Abstract: A pressure controlling valve includes a slidable spool arranged to be spring loaded towards a neutral position. A first port and a second port are connected to allow a fluid flow through the valve. A first and a second pilot port are connected to a cavity adjacent a respective first and second end surface of the spool. The pilot ports are connected to a fluid conduit on either side of a fluid device causing a pressure drop in the fluid conduit and the fluid device is connected to one of the first or second ports. The spool is displaced against the spring load in response to a pressure difference between the first and the second pilot port, whereby a control surface of the spool is arranged to restrict the fluid flow through the valve when the control surface approaches a central cavity.

Abstract: The invention relates to the metering of fluids at low flow rates. More particularly, the invention provides a flow regulator for flows as low as about ½ ml per hour, provided with locking means for any set value within its range. The flow regulator comprises: an inner non-revolving core element, an outer housing, having a hollow base section and being revolvably supported co-axially with the core element, first and second chambers disposed between the core element and the outer housing, each chamber having an inlet and an outlet, the outlet of the first chamber and the inlet of the second chamber being connected by a flow restriction path, a diaphragm separating the two chambers and sealing an inlet to a discharge tube when pressure in the first chamber is higher than pressure in the second chamber, and a circular spring placed in the secondary chamber below the diaphragm and around the discharge tube.

Abstract: A continuous flow regulator for vehicle heating systems includes a body configured to be connected in-line with coolant flowing through the heating coil of the heating system. A spring biased ball valve assembly is disposed in the body and is configured to restrict flow through the regulator in response to increasing flow rate of coolant and to open flow through the regulator in response to decreasing flow rate of coolant. Flow rate of coolant is therefore continuously adjusted and regulated to protect the heater core from corrosion due to high coolant flows therethrough.

Abstract: There is described a device for reducing the delivery pressure of a combustible gas, particularly for systems supplying gas to internal combustion engines for automotive vehicles, comprising a valve seat (5) positioned in a gas flow tube (2) formed in the body (1a) of the reducer, between an inlet section (3) and an outlet section (4), a diaphragm-operated plug element (6) associated with said valve seat (5) and movable along a predetermined axial direction (X) for the purpose of opening and closing the seat (5), a spring device (9) acting on the to diaphragm to subject the latter to a predetermined resilient load, an actuator rod (11) connected for operation to the plug (6) and to the diaphragm, a pressure compensator element (12) which is fixed to the plug (6) upstream of the valve seat with respect to the direction of flow, and which is axially extensible along that direction as a result of the movement of said plug (6) relative to the valve seat (5).

Abstract: A constant-flow valve assembly having a first passageway carrying fluid at a first pressure, a piston chamber, and a second passageway connected to the chamber and carrying fluid at the second pressure. A third passageway carries fluid at a third pressure. An adjustable valve is between the chamber and the third passageway, and an adjustable restrictor is positioned between the first and second passageways. An inlet portion of the restrictor assembly receives fluid at the first pressure and directs the fluid to a restrictor, and outlet portion directs the fluid to the second passageway at the second pressure. The restrictor is movable to adjust the position of entry and exit portions relative to the inlet and outlet portions to adjust a fluid flow rate to the second passageway to adjust the flow rate through the valve assembly.

Abstract: A valve for the control of a gas stream is provided with a valve housing enclosing a valve chamber. At least one pressure-sided inlet and at least one suction-sided outlet is provided with a valve opening between them to link them. An elastically movable control membrane is arranged at the valve housing which reduces or increases the flow cross section in the area of the at least one valve opening and/or opens or closes the at least one valve opening. A first device exerts a first further force on the control membrane in such a way that with an increasing pressure difference the further force exerted by the first device on the control membrane in opposite direction to the closure direction of the valve increases.

Abstract: A fluid regulator that has excellent flow-rate-control response for not only pressure fluctuations at the primary side but also pressure fluctuations at the secondary side and that realizes highly accurate flow-rate control is provided.

Abstract: An in-line fluid flow control valve includes a housing defining an inlet chamber and an outlet chamber aligned along a outlet axis. The housing further defines a bore with a flow control device and an adjustment mechanism disposed therein for regulating a fluid flow rate. The flow control device defines a fluid passage interconnecting the inlet chamber and the outlet chamber. The plane and the outlet axis define an acute angle therebetween. The angled position of the bore relative to the outlet axis permits access to and adjustment of the flow control device, as well as replacement of the flow control device, without disconnecting any fittings attached to the inlet and the outlet of the control valve.

Abstract: A beverage preparation apparatus with a three-way valve that includes an inlet; a first outlet; a second outlet; a first member movable between first and second extreme positions under the influence of liquid flow from the inlet to the first and/or second outlets from the first extreme position towards the second extreme position which closes off the first outlet so that the liquid flow then extends from the inlet to the second outlet; a second member which is freely moveable under the influence of a liquid flow from the inlet to the second outlet between a third and fourth extreme position wherein under the influence of the liquid flow from the inlet to the second outlet, moves from the third extreme position to the fourth extreme position and in the third extreme position blocks a liquid flow from the second outlet in the direction of the inlet.

Abstract: In one embodiment, a constant-flow valve assembly is provided that comprises a first fluid passageway carrying fluid at a first fluid pressure, a piston chamber, and a second fluid passageway connected to the chamber and carrying fluid at the second fluid pressure. A third fluid passageway is configured to carry fluid at a third fluid pressure. An adjustable valve member is provided between the chamber and the third passageway to provide constant fluid flow to the third passageway. An adjustable restrictor assembly is positioned between the first and second fluid passageways. An inlet portion of the restrictor assembly receives fluid at the first fluid pressure and directs the fluid to a restrictor. An outlet portion receives fluid from the restrictor and directs the fluid to the second fluid passageway at the second fluid pressure.

Abstract: A fluid flow regulator (20) comprising: a fluid inlet port (34) and a fluid outlet port (54); at least one open-faced flow control channel (60) defined by a planar bottom (62) and two sidewalls (64) that communicates with the outlet port (54) at a junction (66) and has a cross-section that decreases with distance from the junction; an elastic diaphragm (40); a support shelf (58) on which the diaphragm (40) seats and which supports the diaphragm (40) along a planar contour parallel to the bottom of each of the at least one channel (60); wherein to regulate fluid flow, with increasing inlet fluid pressure the diaphragm (40) covers portions of the open face that are farther from the junction (66) in a region where the cross-section decreases with distance from the junction (66).

Abstract: An annular elastomer is provided in a housing orifice that does not require a large force for deformation. This makes possible a solenoid-type actuator that provides a large displacement of the elastomer, thus allowing higher and lower rates of gas flow through a gas line.

Abstract: In one embodiment, a constant-flow valve assembly is provided that comprises a first fluid passageway carrying fluid at a first fluid pressure, a piston chamber, and a second fluid passageway connected to the chamber and carrying fluid at the second fluid pressure. A third fluid passageway is configured to carry fluid at a third fluid pressure. An adjustable valve member is provided between the chamber and the third passageway to provide constant fluid flow to the third passageway. An adjustable restrictor assembly is positioned between the first and second fluid passageways. An inlet portion of the restrictor assembly receives fluid at the first fluid pressure and directs the fluid to a restrictor. An outlet portion receives fluid from the restrictor and directs the fluid to the second fluid passageway at the second fluid pressure.

Abstract: The description relates to a device for the regulation of the amount of a medium in a heating or cooling system, comprising a combined valve, which in one and the same valve housing includes one part for pressure difference regulation (2) and one part for flow limitation (3), the flow being limited in a stepless, adjustable way, i.e. the device obtaining an adjustable Kvs-value. Also, the chosen Kvs-value can be limited by a plunger, which always can operate with its complete stroke length.