Abstract: A continuous flow endoscope device includes an elongated tubular member defining an interior, a first channel disposed within the interior of the elongated tubular member, a second channel disposed within the interior of the elongated tubular member, and an optics device disposed in a free space of the interior of the elongated tubular member. The second channel is configured to receive an instrument therein during a first portion of an operation. A lumen defined through the second channel is fluidly isolated from a lumen defined through the first channel. The free space of the interior of the elongated tubular member being a space within the interior of the elongated tubular member not occupied by either the first channel or the second channel.

Abstract: A surgical system can include a first instrument defining a first channel and a second instrument receivable by the first channel. The second instrument can include a second channel. A valve coupled to the first instrument controls fluid flow through the first channel. The valve has at least two positions and in one position, the impedance of fluid flow through the valve into the first channel (when the second instrument is not received in the first channel) is substantially the same as when the valve is the other position and the first channel partially blocked by the second instrument. In another aspect, a surgical system can include an outer member and the first instrument can be received within the outer member to define a second channel there between. The first instrument can include a visualization system and an illumination system.

Abstract: A glove application system includes a glove application module providing a housing that defines an install cavity and an access aperture providing access into the install cavity, a pressure system that generates negative and positive pressures in the install cavity, and a glove cartridge assembly mounted to the housing and including a cartridge belt having a plurality of glove cartridges spaced along the cartridge belt, each glove cartridge having a glove releasably secured to the cartridge belt. The glove cartridge assembly is operable to advance the cartridge belt to sequentially align each glove cartridge with the access aperture. Negative pressure generated by the pressure system causes a glove aligned with the access aperture to inflate into the install cavity, and positive pressure generated by the pressure system causes the glove to seat against a hand extended into the glove through the access aperture.

Abstract: A ball valve for fermentation tank includes a main body, a ball body, and a rotation mechanism. The main body encloses a chamber therein and has a first inlet, a first outlet, and a discharge port therebetween. The ball body has a flow channel with a second inlet, a second outlet, and a liquid intake port. A gap is formed between the ball body and the main body. The rotation mechanism is connected to the ball body to make it rotate. When the ball body is at an open position, the second inlet communicates the first inlet, the second outlet communicates the first outlet, and the liquid intake port communicates the gap. When the ball body is at a washing position, the second inlet and the second outlet face the gap, the liquid intake port communicates the first inlet.

Abstract: A fluid flow control valve includes a valve body, a closing member arranged in the valve body and configured so that it can have at least one first position, called the open position, in which it allows the flow of fluid to flow freely in the valve body, and at least one second position, called the closed position, in which it prevents the fluid flow from flowing in the valve body between the fluid inlet and the fluid outlet, an electric actuator of the closing member that is suitable for being able to control the position of the closing member in the valve body, characterized in that the electric actuator is arranged in the valve body so that it can be cooled by the flow of fluid flowing in the valve body.

Abstract: A hydraulic valve is provided that includes an interior spool and a surrounding cage. A supply port and a return port are connected to the cage and the interior of the cage is in fluid communication with a control port. The interior spool is positioned between an on and off position using a solenoid and a spring. In the off position, slots in the spool and cage align to place the return port in fluid communication with the interior of the spool. Conversely, in the on position, different slots in the spool and cage align to place the supply port in fluid communication with the interior of the spool.

Abstract: In a heating medium channel switching device, a valve body whose interior is partitioned into two channels by a partition plate is axially rotated by a motor, whereby a relative position of the valve body in a valve chamber is controlled. Because of this, one of a first heating medium and second heating medium can be selected and caused to flow out in one channel, and one of a third heating medium and fourth heating medium can be selected and caused to flow in the other channel. Also, heating medium flow can be controlled by an angle of rotation of the valve body being controlled.

Abstract: Single-piece valve closure members (e.g., discs, plugs, balls, etc.) including integral flow paths formed via additive manufacturing processes are disclosed. In some examples, an apparatus includes a single-piece valve closure member. In some examples of the apparatus, the single-piece valve closure member includes an integral flow path to direct a flow of fluid within the valve closure member. In some examples, a method includes forming, via an additive manufacturing process, a single-piece valve closure member. In some examples of the method, the single-piece valve closure member includes an integral flow path to direct a flow of fluid within the valve closure member.

Abstract: A valve for the control of a fluid flow may be provided, the valve including a connection block having a cylinder-symmetrical recess, where at least one first and a second entry channel as well as a first and a second exit channel run out in the peripheral surface of the recess. A control pin, which is fitted into the recess, is rotatable about a rotation axis, having at least two through-channels and connecting different ones of the entry and exit channels of the connection block to one another depending on its angular position. A first through-channel in the pin, with respect to the rotation axis, may exclusively connect channels running out at a first axial height, to one another, and a second through-channel exclusively connecting channels running out at a second axial height, to one another.

Abstract: The Application describes a throttle and a method for controlling a fluid flow via a throttle . The throttle includes an inlet (618) in communication with a pressurized gas source, an outlet (610) including a selected output orifice (612), and an orifice sleeve (606) including a plurality of output orifices (612a, 612b, 612c, 612d) from which a selected output orifice (612) may be selected by rotating the orifice sleeve (606). The throttle may further include a piston (604) movable across a surface area of the selected output orifice (612), and a motor operable to move the piston (604) across the surface area of the selected output orifice (612).

Abstract: A fluid controller includes a valve housing having an inlet port, a return port, first and second control ports and a load sense port. The fluid controller further includes a fluid meter in selective fluid communication with the valve housing and a valve assembly adapted to provide selective fluid communication between the valve housing and the fluid meter. The valve housing includes a main flow path and a load sense flow path. The main flow path is adapted to provide selective fluid communication between the inlet port and the first control port. Fluid in the main flow path passes through the fluid meter. The load sense path is adapted to provide selective fluid communication between the load sense port and the main flow path. The load sense flow path includes a variable load sense orifice that substantially closes prior to a maximum rotational displacement of the valve assembly.

Abstract: Provided herein are rotary valve assemblies, engines, and corresponding methods. A rotary valve assembly may include a valve housing defining a cylindrical bore, an inlet, and an outlet. The valve assembly may further include an intake assembly and a throttle assembly arranged concentrically within the cylindrical bore of the valve housing, and the intake assembly and the throttle assembly may rotate independently of one another with respect to a longitudinal axis. During operation of the rotary valve assembly, the valve housing may permit fluid to enter the cylindrical bore of the valve housing via the inlet, the intake assembly may rotate to permit the fluid to flow through the at least one intake inlet port and the at least one throttle inlet port into the throttle body, and the intake assembly may permit the fluid to flow to the outlet from the throttle body.

Abstract: A tower structure for a wind power plant permits very high hub heights in a cooperation of internal prestress, guying, and a torsionally rigid tower shaft. The tower structure has a tower shaft, a foundation and a transition piece in a he region of an upper end of the tower shaft. Guy elements are inclined towards a longitudinal axis of the tower shaft, and extend radially outside an outer skin of the tower shaft. Tension members are radially inside the outer skin to prestress the tower shaft vertically at least in sections. The tower shaft is made of prestressed concrete in a region between the transition piece and the foundation. To control resonance behavior, prestressing and guy elements are acted upon with a variable tensile stress which varies and influences natural frequencies of the tower structure such that no interferences occur between excitation frequencies and the natural frequencies, and such that an aerodynamic absorption is also possible.

Abstract: A rotary distributor device for a hydraulic power steering, which receives oil from a pump and sends the oil selectively to a discharge or to an actuator of the steering in a desired direction, comprises a jacket, a slide, sealedly rotating in the jacket, a series of openings that cross the wall of the jacket, located in front of a series of corresponding openings which cross the wall of the slide, elastic member located between the jacket and the slide configured to maintain the openings of the jacket at the openings of the slide, in which each opening in the jacket includes, in succession starting from the outside, at least one radial hole, a slot lying in a radial plane, arranged symmetrically with respect to the axis of the hole, the width being smaller than the diameter of the hole, and the depth being such as to intersect the hole.

Abstract: A rotary selection valve (1) is disclosed having a stator (20) and a rotor (40) having complementary abutting fluid tight surfaces (30,50) for relative rotation between the stator (20) and the rotor (40) about a rotational axis. The stator or rotor has at least one connection port in fluid communication with an associated orifice at said stator or rotor abutment surfaces (30,50). The stator and/or rotor further comprise a separate fluid recess extending radially beyond said associated orifice or orifices and open to the complementary abutment surfaces for improving the automatic cleaning of the valve.

Abstract: An adhesive dispensing module includes a pneumatic actuator for actuating reciprocating movement of a piston on a dispenser valve member. The pneumatic actuator includes a valve element and a pneumatic housing with an inlet chamber, an exhaust chamber, and a piston chamber. The valve element includes a plurality of inlet passages and a plurality of exhaust passages. The valve element rotates from a first position in which the inlet passages deliver pressurized air from the inlet chamber to the piston chamber, to a second position in which the exhaust passages exhaust pressurized air from the piston chamber to the exhaust chamber. The valve element also includes a plurality of fins configured to be driven by an electromagnetic coil to move the valve element.

Abstract: A method of preventing a mass flow controller from participating in crosstalk in an array of mass flow controllers is described. The method includes sensing and providing a signal indicative of a fluid pressure inside of a mass flow controller with a pressure sensor contained within the mass flow controller, determining a response of a control valve to a rapid pressure perturbation at the inlet of the mass flow controller using the signal indicative of the fluid pressure to avoid overcompensation for the rapid pressure perturbation, and adjusting a control valve contained within the mass flow controller downstream of the pressure sensor, based on the determined response, so that the mass flow controller avoids overcompensating for the rapid pressure perturbation. The pressure sensor is positioned such that the pressure sensor is sensitive to rapid pressure perturbations at the inlet of the mass flow controller.

Abstract: A control device (1) for a hydrostatic steering motor comprises supply and return pump and tank connections (P, T), a slide valve arrangement in which inner and outer slide element sleeves are rotatable relative to each other to both sides of a neutral position through a limited small angle, said sleeves mutually forming controlled supply and return passages connected to said motor having supply and return throttles which are closed when said sleeves are in a neutral position, bypass throttle means (7) between said pump and tank connections (P, T) being open when said sleeves are in a neutral position, said bypass throttle means (7) having a set of at least two variable orifices connected in series. In such a device the noise should be reduced when a higher supply pressure of hydraulic fluid is used.

Abstract: A power steering device is mounted on a vehicle and includes a torque applying unit and an applied friction torque changing unit. The torque applying unit sets an applied friction torque applied to a steering wheel based on a real steering angle and a target steering angle, and performs a control of applying the applied friction torque to the steering wheel. The applied friction torque changing unit changes the applied friction torque based on a load condition of the vehicle.

Abstract: A pinion valve body and a vehicle pinion valve assembly with the valve body are disclosed. The pinion valve body has a lower sleeve integrally formed by a sintering process along with upper splines to block an oil leakage and thus there are no needs any more for the conventional separate lower sleeve as well as the associated machining of sleeve fitting areas on the valve body and the process of press-fitting such sleeve all together, thereby effectively reducing the general manufacturing steps and their cost.

Abstract: A system in some embodiments includes a machine block comprising features configured to support moving machine components within a lubricating fluid, wherein the machine block includes an integral valve block configured to route the lubricating fluid through a first filter without a second filter and configured to route the lubricating fluid through the second filter without the first filter. Further embodiments include a method that includes switching circulation of a lubricant between a first filter and a second filter in response to an angular position of a valve disposed in a valve block integral to a machine block having moving components lubricated by the lubricant.

Abstract: In a multi cylinder thick materials pump for feeding concrete in particular, whose at least two feeding cylinders feed the thick material from a pre filling container into a feed line, and a shift valve for alternatively connecting the feeding cylinders, having a feed line associated with it, comprising at least two rotationally movable valve bodies, each comprising a straight transfer section between each one of the feeding cylinders and the feed line, connected downstream of the feeding cylinders to a collector tube, the shift valve including at least one, but preferably two rotationally movable rotating slides each of them comprising a straight transfer section for connecting the feeding cylinder respectively associated with it to the feed line, and at least one section blocking the connection. Also a process for operating of this thick materials pump for continuous feeding is described.

Abstract: The present invention includes embodiments that generally relate to methods and devices for control of electrospinning processes. Some embodiments include constant current electrospinning jets. Other embodiments include pressure control using a system of valves in fluid communication with the electrospinning fluid. Still other embodiments include control of one or more physical parameters.

Abstract: The invention provides a fluid controller, e.g. for a hydrostatic power steering. The controller comprises a cylindrical valve member cooperating with a housing to define at least one fluid path from a pressure source to a steering cylinder. The valve member is rotatable in the housing and comprises a sleeve and a spool, wherein the spool is rotatable within the sleeve. The fluid flow is metered by a flow meter, and the valve member comprises a plurality of meter ports communicating the fluid between the valve member and the flow meter. To obtain less friction between the sleeve and the housing and between the sleeve and the spool, the meter ports are grouped in two groups in which groups the ports are in mutually fluid communication.

Abstract: The invention regards a manifold for fluids, comprising a housing (10) with a centre axis (11) and a number of fluid apertures (12,13) through the walls forming the housing (10) and a fluid diverter system (20), comprising a fluid diverter element (25) mounted in the system (20) selectively rotating around an axis, comprising an axial outlet (27) and an inlet (26) which may be positioned in connection with one fluid aperture (12,13) in the housing. The fluid diverter system (20) is axially insert able into the housing (10) and further comprises a ring element (21), with an outer configuration complementary to an inner configuration of the housing (10), which ring element (21) is positioned around the fluid diverter element (25) and connected to the fluid diverter element (25), and which ring element (21) comprises fluid apertures (22A,B) corresponding to the fluid apertures (12,13) in the housing.

Abstract: A fluid controller (15a) in a multiple-input hydrostatic power steering system includes a check valve assembly (101), having a first fluid passage (111), defining a check valve seat (105) and a check valve (103) operably associated therewith, in fluid communication with a second fluid passage (109), with the second fluid passage (109) being in fluid communication with a return port (25a). In the left (L) and right (R) operating positions, return flow can flow from the interior region (114) of the valve (27), through the first fluid passage (111), past the check valve (103), and through the second fluid passage (109) to the return port (25a). In the neutral position (N), pressurized fluid can flow from an inlet port (19a) to the return port (25a), with the check valve (103) preventing fluid from flowing through the first fluid passage (111) and into the interior region (114) of the valve (27).

Abstract: A fluid controller (17) controls a main fluid path (18) from a pump (11) to a primary steering cylinder (19) and a second fluid path (26) from a fluid meter (37) to a second cylinder (31). A mechanical or electrical linkage (149) couples the primary steering cylinder (19) to the second cylinder (31) such that displacement of the primary cylinder (19) results in proportional corresponding displacement of the second cylinder (31). The main fluid path (18) and the second fluid path (26) are maintained separate from each other. As such, the main fluid path (18) provides pressurized fluid from the pump to the primary steering cylinder (19) without communicating main fluid flow to the secondary cylinder (31). Due to the separate fluid paths, the present invention can be used to provide a substantial amount of fluid through a fluid controller (17) with a relatively small displacement fluid meter (37).

Abstract: A valve includes a rotating, substantially pressure-balanced spool that selectively aligns openings within the spool with openings within a sleeve to selectively connect ports of a manifold for gas or liquid routing. A valve may also include a stem, a needle coupled to the stem. a seat configured to receive the needle, a reservoir, an outlet coupled to the reservoir, and a servo motor coupled to the stem. The servo motor rotates the stem to raise or lower the needle relative to the seat to variably restrict or allow matter flowing from the reservoir to the outlet.

Abstract: A control valve for a hydraulic power steering system includes a pair of flow circuits arranged in parallel. Each flow circuit includes an upstream and downstream flow orifices arranged in series. Each set of orifices defines between the orifices an intermediate pressure zone of the valve. Both orifices close together from a centered condition of the valve and fully close substantially together at a fully closed condition of the valve. The downstream orifice is larger than the upstream orifice when open to minimize the likelihood of cavitation and noise. An equalization passage fluidly connects both intermediate pressure zones to equalize pressure despite variations in orifice size due to manufacturing tolerances. The control valve includes a bypass passage in parallel with the flow circuits. A pressure relief valve in the control valve has a normally closed valving member in the bypass passage that opens the valve in the event of overpressure.

Abstract: A control valve for a hydraulic power steering system includes a pair of flow circuits arranged in parallel. Each flow circuit includes an upstream and downstream flow orifices arranged in series. Each set of orifices defines between the orifices an intermediate pressure zone of the valve. Both orifices close together from a centered condition of the valve and fully close substantially together at a fully closed condition of the valve. The downstream orifice is larger than the upstream orifice when open to minimize the likelihood of cavitation and noise. An equalization passage fluidly connects both intermediate pressure zones to equalize pressure despite variations in orifice size due to manufacturing tolerances. The control valve includes a bypass passage in parallel with the flow circuits. A pressure relief valve in the control valve has a normally closed valving member in the bypass passage that opens the valve in the event of overpressure.

Abstract: An apparatus comprises a valve body having a cylindrical bore centered on an axis. A cylindrical core extends axially within the bore and is fixed relative to the valve body. A sleeve within the bore extends circumferentially about the core and is rotatable about the axis relative to the core. A passage extends radially through the sleeve and provides a radial flow path from the core through the passage to the valve body. Alignment of the passage is circumferentially selectable by rotation of the passage with the sleeve about the axis.

Abstract: A fluid controller (27) for use with a fluid pressure operated device (45) having an inlet (47) and an outlet (49) and defining a fluid leakage path therebetween. The controller (27) includes valving (61) defining a main fluid path and further defines a fluid bleed passage including a variable bleed orifice (AB), having a substantially zero flow area when the controller valving (61) is in its neutral position (N) and in the normal operating position (R), but beginning to open as the valving approaches its maximum displacement position (R-M).

Abstract: A method for assembling a rotary valve for hydraulic power assisted steering systems may be used for a rotary valve having the following features: both valve elements of the rotary valve have longitudinal control grooves, interacting control edges of the longitudinal control grooves of the control bushing and of the rotary slide being formed parallel to each other and converging in an oblique manner at the same angle in relation to the longitudinal axis of the rotary valve. The method includes the following steps: the rotary slide is pushed into the control bushing up to a point just ahead of a stop in the region of the valve output member. The two valve elements of the rotary valve are aligned in their central position and are clamped there in a manner secure against rotation in relation to a torsion bar spring. In order to determine the profile of a basic characteristic curve, the rotary valve is deflected fully in both directions and the pressure/angle or the pressure/torque ratio is recorded.

Abstract: A rotary valve is interposed between an intake pump and an exhaust pump for supplying an air, and at least one suction head or one nozzle that performs a predetermined operation upon reception of the air supplied from the intake and exhaust pumps, to supply/stop supplying the air. This rotary valve includes a valve body, a main body, a notch, and a hollow portion. The valve body is rotatably driven in a cylinder. The main body rotatably supports the valve body. The notch is formed in a circumferential surface of the valve body and is connected to the intake pump. The hollow portion is formed in the valve body in an axial direction and is connected to the exhaust pump.

Abstract: A hydraulic fluid control valve (18) for a power steering gear (10) includes first and second relatively rotatable valve members (60, 62) which direct hydraulic fluid to flow between the valve members (60, 62) from inlet ports (70) to outlet ports (92). The valve members (60, 62) have radially opposed lands (71-79, 101-109) and grooves (81-89, 121-129) defining orifices (130) that enlarge and orifices (130) that constrict upon relative rotation of the valve members (60, 62) from neutral positions. A pair of the constricting orifices (130b, 130c) are located in parallel between the inlet ports (90) and the outlet ports (92). Each of those parallel constricting orifices (130b, 130c) is defined by a corresponding chamfered corner portion of a corresponding land (101, 102). The valve members (60, 62) provide back pressure at selected orifices between the outlet ports (92) and the inlet ports (90). The selected orifices include both constricting orifices (130b, 130c).

Abstract: An in-line diversion valve including a body and a plug assembled with the body. The body has an annular run extending axially from a first end opening configured to define a first port to a second end opening, and at least one annular branch extending radially from the run to a third end opening configured to define a second port of the valve. The plug extends coaxially with the body run from a first end received internally therewithin to a second end which extends externally beyond the body second end opening and which is configured to define a third port aligned coaxially with the first port. The plug is rotatable within the body and is formed as having a first passageway extending through the first and second ends thereof, and at least one perpendicular second passageway.

Abstract: A hydraulic steering device, in particular for vehicles, is disclosed, having a housing in which two sliders are arranged to move relative to one another and together form at least one adjustable throttle, a restoring device for restoring the two sliders to their neutral position being provided, one of the two sliders being driveable and the other of the two sliders being in operative connection with a measuring device. In such a steering device it is desirable to improve the correlation between steering torque and flow amplification; in particular it is desirable to linearize the relationship better. For that purpose the measuring device is arranged in a flow path closed in itself, and operates as a pump, while an open flow path runs past the closed flow path from an inlet connection arrangement to an outlet connection arrangement.