Abstract: A valve for controlling fluids includes a valve housing in which an actuator chamber is embodied, in which chamber a piezoelectric actuator module for actuating a valve member that is axially displaceable in a valve body is disposed, which valve member has an adjusting piston upon which the actuator module acts and also has an actuating piston which is operatively connected to the adjusting piston via a hydraulic coupler and which is in contact with a valve closing member, disposed in a valve chamber, that cooperates with at least one valve seat and downstream thereof a diversion conduit branches off. An axially acting first prestressing spring engages the actuator module, and the adjusting piston is loaded in the direction of the actuator module.

Abstract: The invention relates to a valve for controlling fluids, having an actuator unit for actuating a valve member which has a first piston and a second piston, separated from it by a hydraulic chamber, and which actuates a valve closing member that divides a low-pressure region at system pressure from a high-pressure region. For leakage compensation, a filling device connectable to the high-pressure region is provided with a hollow chamber, in which a throttle body is disposed such that a line leading to the high-pressure region discharges into the hollow chamber on one end of the throttle body, and on the other end a system pressure line leading to the hydraulic booster branches off. The system pressure is built up as a function of the prevailing pressure in the high-pressure region, by means of geometrically defining the throttle body, a gap surrounding it, and the dimensions of the piston along which the system pressure is reduced.

Abstract: A valve (1) for regulating fluids has a piezoelectric unit (4) for actuating a valve member (3). The valve member is embodied with a control piston (9), adjacent to the piezoelectric unit (4), and with at least one actuating piston (14), adjacent to a valve closing member (15). A hydraulic chamber (16) functioning as a hydraulic booster is disposed between the pistons (9, 14). The valve closing member (15) cooperates with at least one valve seat (18, 19) and divides a low-pressure region (20) from a high-pressure region (21). An electric control unit (12) specifies the trigger voltage for the piezoelectric unit (4) as a function of the pressure level in the high-pressure region (21), a leakage loss from the low-pressure region (20) and the hydraulic chamber (16), and the refilling of the low-pressure region.

Abstract: A valve for controlling fluids having an actuator unit for actuating a valve member, which has a first piston and a second piston, separated from it by a hydraulic chamber, and which actuates a valve closing member that divides a low-pressure region at system pressure from a high-pressure region. For leakage compensation, a filling device connectable to the high-pressure region is provided with a hollow chamber, in which a throttle body is disposed such that a line leading to the high-pressure region discharges into the hollow chamber on one end of the throttle body, and on the other end a system pressure line leading to the hydraulic chamber branches off. The system pressure is built up by geometric definition of a throttle bore in the throttle body and of the dimensions of the piston, along which the system pressure is reduced, as a function of a prevailing pressure in the high-pressure region.

Abstract: The invention relates to a valve for controlling fluids, having a piezoelectric unit (4) for actuating a valve member (3), with which a valve closing member (12) is associated that divides a low-pressure region (16) at system pressure from a high-pressure region (17). The valve member (3) has at least one first piston (9) and one second piston (11), between which a hydraulic chamber (13) is embodied.

Abstract: A valve for controlling fluids has a piezoelectric unit (3) for actuating a valve member (2) that is displaceable in a bore (8) of a valve body (9), having at least one control piston (7) and at least one actuating piston (10) for actuating a valve closing member (9). Between the control piston (7) and the actuating piston (10), a hydraulic chamber (11) functioning as a hydraulic coupler is embodied; the actuating piston (10), defining the hydraulic chamber (11), is supported displaceably in a blind bore (12) of the control piston (7), which bore is open in the valve seat direction. A cross-sectional area (A0), bordering the hydraulic chamber (11), of the control piston (7) on the one hand and a smaller cross-sectional area (A1) of the actuating piston (10) and a cross-sectional area (A2) of at least one reducing element (14) determine a boost for the stroke length of the actuating piston (10), during which the at least one reducing element (14) is braced on a stop (15) in the bore (8) (Drawing figure).

Abstract: The invention concerns an injection device having a fluid port (10), a control valve (12), a setting element (14), by way of which a region of a first face (24) of the control valve (12) can be acted upon with force, and a control chamber (30) provided on the side of a second face (26) of the control valve (12), whereby a compensating chamber (28) is provided on the side of the first face (24) of the control valve (12), the compensating chamber (28) is partially limited by the first face (24) of the control valve (12), and the compensating chamber (28) communicates with the control chamber (30). The invention also concerns a control valve as well as a method for injecting fluid.

Abstract: A solenoid-operated valve which has, between a moving element operated by an electromagnetic force and a valve element, a displacement converting mechanism for increasing or decreasing a displaced amount of the valve element relative to a displaced amount of the moving element, or a force converting mechanism for increasing or decreasing a driving force of the valve element relative to a driving force of the moving element. This solenoid-operated valve can reduce power consumption because it changes the displaced amount or the driving force of the valve element with a simple structure.

Abstract: A valve for controlling fluids, having an in particular piezoelectric actuator unit for actuating a valve member (10) that is disposed in an at least one-piece valve body (22) and that has at least one displacement piston (11) communicating with the actuator unit and at least one actuating piston (13) operatively connected to the displacement piston (11) via a hydraulic coupler (12), which actuating piston is connected to a valve closing member (14) which cooperates with at least one valve seat (15) and in the closing position disconnects a control chamber (19) from an outlet chamber (20), the hydraulic coupler (12) being provided with a filling device is proposed. The valve closing member (14) has a pistonlike cylindrical region (17; 41; 51), which with the valve body (22) forms at least one filter gap for the fluid to be delivered to the filling device, and at whose level an inlet conduit (26) of the filling device branches off (FIG. 1).

Abstract: An injection valve is proposed, including at least a nozzle module (2), which has a valve control piston (4), cooperating with a nozzle needle, and a valve control chamber (5) defined by a spring plate (21) and a face end (6) of the valve control piston (4), which valve control chamber communicates with a high-pressure supply line (9) via an inlet conduit (7) and is operatively connected, via an outlet conduit (24), with a valve control module (3) that is actuated by means of a piezoelectric actuator unit and is embodied in valvelike fashion and has at least one valve closing member (14), disposed in a valve chamber (18) and cooperating with at least one valve seat (16, 17); the nozzle needle is opened via a pressure reduction in the valve control chamber (5), effected by means of the valve control module (3) via the outlet conduit (24), and is closed via a filling of the valve control chamber (5).

Abstract: A valve for controlling fluids, having an in particular piezoelectric actuator unit (20) for actuating a valve member is proposed, which has at least one adjusting piston (19) and at least one actuating piston (16) that is guided in a valve body (15) and actuates a valve closing body, which valve closing body cooperates with at least one valve seat (24) embodied on the valve body (15) and in the closing direction disconnects a control bore (14) from an outlet chamber (25), from which a return conduit (26) branches off, wherein between the adjusting piston (19) and the actuating piston (16), a hydraulic chamber (18) is disposed, which transmits a motion of the adjusting piston (19) to the actuating piston (16). To keep the size of the actuator unit (20) small, the actuating piston (16), at least when the valve closing body is closed, is supported essentially in a hydraulically force-balanced fashion (FIG. 2).

Abstract: The invention relates to an injection valve which has a piezo actuator that is functionally connected to a nozzle needle by a hydraulic transmission device. The hydraulic transmission device is connected to a pressure reservoir by a sealing gap so that the pressure differences between the pressure reservoir and a hydraulic chamber of the hydraulic transmission device are compensated in the long term.

Abstract: The invention relates to an injection system having a piezoelectric adjuster (10), a hydraulic booster (12) and a control valve (14). In continuous operation of the injection system, the stroke of the piezoelectric adjuster (10) can be transmitted to the control valve (14) via a hydraulic medium in the hydraulic booster (12). In addition, the piezoelectric adjuster (10) and the components of the hydraulic booster (12) are disposed relative to the control valve (14) such that at least a portion of the stroke of the piezoelectric adjuster (10) can be transmitted directly to the control valve (14). In the method according to the invention for operating a piezoelectric injector, in which the piezoelectric adjuster (10) is electrically excited and made to execute a stroke; in a first phase, the stroke is transmitted directly to a control valve (14); in a second phase, the stroke is transmitted hydraulically to a control valve (14); and the control valve (14) is opened by the stroke.

Abstract: A valve for controlling liquids is embodied with a piezoelectric unit (3) for actuating a valve member (2) that is axially displaceable in a bore (8) of a valve body (9). The valve member (2), which has at least one control piston (7) and at least one actuating piston (10), is assigned a valve closing member (13), which cooperates with at least one valve seat (16, 17) provided on the valve body (9) for opening and closing the valve (1), and which divides a low-pressure region (16) at.system pressure from a high-pressure region (17). A hydraulic chamber (11) between the control piston (7) and the actuating piston (10) functions as a tolerance compensation element for the piezoelectric unit (3) and as a hydraulic step-up means.

Abstract: A valve for controlling fluids [is proposed,] having an actuator unit [(4)] for actuating a valve member [(3)], which has a first piston [(9)] and a second piston [(11)], separated from it by a hydraulic chamber [(13)], and which actuates a valve closing member [(12)] that divides a low-pressure region [(16)] at system pressure from a high-pressure region [(17)]. For leakage compensation, a filling device [(27)] connectable to the high-pressure region [(17)] is provided with a hollow chamber [(25)], in which a throttle body [(26)] is disposed such that a line [(33)] leading to the high-pressure region [(17)] discharges into the hollow chamber [(25)] on one end of the throttle body [(26)], and on the other end a system pressure line [(28)] leading to the hydraulic chamber [(13)] branches off.

Abstract: A valve for controlling fluids has a piezoelectric unit (3) for actuating a valve member (2) that is displaceable in a bore (8) of a valve body (9), having at least one control piston (7) and at least one actuating piston (10) for actuating a valve closing member (9). Between the control piston (7) and the actuating piston (10), a hydraulic chamber (11) functioning as a hydraulic coupler is embodied; the actuating piston (10), defining the hydraulic chamber (11), is supported displaceably in a blind bore (12) of the control piston (7), which bore is open in the valve seat direction. A cross-sectional area (A0), bordering the hydraulic chamber (11), of the control piston (7) on the one hand and a smaller cross-sectional area (A1) of the actuating piston (10) and a cross-sectional area (A2) of at least one reducing element (14) determine a boost for the stroke length of the actuating piston (10), during which the at least one reducing element (14) is braced on a stop (15) in the bore (8) (Drawing figure).

Abstract: A valve for controlling fluids is proposed, including at least one actuator unit (4) for actuating a valve member (3) which is axially displaceable in a bore (10) of a valve body (7) and which has at least one valve closing member (12), disposed in a valve chamber (18) and cooperating with at least a first valve seat (14), as well as a first piston (9) and a second piston (11). Between the pistons (9, 11), a hydraulic chamber (13) functioning as a hydraulic booster is disposed, which to compensate for leakage losses has a filling device, which comprises a pressure compensation conduit (24) that essentially transmits the pressure prevailing in the valve chamber (18) to the hydraulic chamber (13), making for a quasi-force-balanced valve (Drawing).

Abstract: A valve for controlling fluids is described, wherein a valve closing member (13) divides a low-pressure region (16) in the valve (1) from a high-pressure region (17), and a filling device (19) is provided to compensate for a leakage quantity from the low-pressure region (16) by withdrawal of hydraulic fluid from the high-pressure region (17). The filling device (19) is embodied in a valve body (9) with a conduitlike hollow chamber (18) in which a solid body (26) is disposed in such a way that a gap (28) is formed between the solid body (26) and the valve body (9). The material of the solid body (26) has a coefficient of thermal expansion that is so much greater than that of the material of the valve body (9) that with increasing temperature, a viscosity-dictated increase in the volumetric flow around the solid body (26) is at least partly limited (FIG. 1).

Abstract: A valve for triggering a fluid is proposed, having an actuator unit (7) for actuating an axially displaceable valve member (6), with which a valve closing member (15) is associated, which for opening and closing the valve (1) cooperates with a valve seat (23) and which separates a high-pressure region (3) from the valve (1). In the high-pressure region (3), the fluid to be triggered is at an operating pressure (p_R). This operating pressure (p_R) and an overpressure that may occur in some circumstances is recorded, because of the provision that the actuator unit (7) is embodied as a force-measuring sensor. In particular, this valve (1) serves as a pressure-limiting valve in a common rail system (Drawing).

Abstract: A valve (1) for controlling liquids is proposed, having a piezoelectric unit (3) for actuating a valve member (2), which member is axially displaceable in a bore (8) of a valve body (9) and on one end has a valve closing member (13) that cooperates with at least one seat (14, 15), provided on the valve body (9), for opening and closing the valve (1). The valve closing member (13) divides a low-pressure region (16) having a system pressure (p_sys) from a high-pressure region (17). To compensate for a leakage quantity from the low-pressure region (16) by drawing hydraulic liquid from the high-pressure region (17), a filling device (26) is provided, which is embodied with a conduit (27) having a throttle bore (28). The diameter of the throttle bore is designed such that a volumetric flow that from the high-pressure region (17), which flow passes through the throttle bore (28), at a defined minimum high pressure (p_R_min) compensates for the leakage quantity from the low-pressure region (16) (FIG. 1).

Abstract: A valve for controlling fluids is provided, having a valve member (3) axially movable in a valve body (5), having a hydraulic chamber (12) acting as a hydraulic booster, and having a filling device (15) to compensate for leakage losses, which device communicates with a high-pressure region (14) and a lowpressure region (13) of the valve and has a throttle body (18). According to the invention, it is provided that the throttle body is movable, as a function of a pressure prevailing in the lowpressure region (13), such that filling of the hydraulic chamber (12) with fluid takes place (FIG. 1).

Abstract: A valve for regulating fluids includes a piezo-electric actor unit (9) for operating a valve member assembly. The valve member assembly has at least one first piston (13) guided in a valve body (10) and a second piston (14). A hydraulic chamber, acting as a hydraulic converter, is disposed between the first and second pistons (13, 14). The second piston operates a valve-closing member (15) disposed on an end facing away from the hydraulic chamber (16). The valve closing member (15) cooperates with at least one valve seat (17) formed on the valve body (10) and in a closed position, separates a system pressure region (18) of the valve (1) from a high pressure region (5). The second piston (14) is surrounded by and supported by an approximately casing-type spacer (22) on the valve body (10).

Abstract: A fuel injector, especially an injector for fuel injection systems in internal combustion engines, has a piezoelectric or magnetostrictive actuator. The actuator, via a valve needle, activates a valve-closure member, which cooperates with a valve seat surface to form a sealing seat. The actuator can be actuated in a first direction of motion. In contrast, the valve-closure member can be moved by the valve needle in a second direction of motion (40) that is essentially perpendicular to the first direction of motion.

Abstract: The invention relates to a valve for controlling fluids, having a piezoelectric unit (4) for actuating a valve member (3), with which a valve closing member (12) is associated that divides a low-pressure region (16) at system pressure from a high-pressure region (17). The valve member (3) has at least one first piston (9) and one second piston (11), between which a hydraulic chamber (13) is embodied.

Abstract: The present invention relates to a valve for controlling fluids, having a piezoelectric actuator and a hydraulic booster (2), which has a first piston (3), a second piston (4), and a pressure chamber (6) disposed between the two pistons. A valve member (6) is connected to the second piston (4) and can be brought into contact with at least a first valve seat (7). To adjust a stroke of the valve member (6), a separate adjusting element (10) is present as an individual component.

Abstract: The present invention relates to a valve for controlling fluids, which has a piezoelectric actuator (2) that is disposed in an actuator bore (3). A hydraulic booster (11) and a bellows (5) are also provided. The bellows (5) is embodied such that it can absorb the axial stroke of the piezoelectric actuator (2). The bellows (5) is connected solidly to the piezoelectric actuator (2) and is also connected solidly to the actuator bore (3). This assures a fluid-tight seal of the actuator module relative to the other regions of the valve.

Abstract: The invention relates to a valve for controlling fluids, having an actuator unit (4) for actuating a valve member (3) which has a first piston (9) and a second piston (11), separated from it by a hydraulic chamber (13), and which actuates a valve closing member (12) that divides a low-pressure region (16) at system pressure from a high-pressure region (17). For leakage compensation, a filling device (27) connectable to the high-pressure region (17) is provided with a hollow chamber (25), in which a throttle body (26) is disposed such that a line (33) leading to the high-pressure region (17) discharges into the hollow chamber (25) on one end of the throttle body (26), and on the other end a system pressure line (28) leading to the hydraulic booster branches off.

Abstract: A valve (1) for controlling liquids is embodied with a piezoelectric unit (3) for actuating a valve member (2) that is axially displaceable in a bore (8) of a valve body (9). One end of the bore (8) adjoins a valve system pressure chamber (18) defined by a sealing element (25), and its other end adjoins a valve low-pressure chamber (16), which has a leak drainage conduit (17) and which communicates with the valve system pressure chamber (18) via a compensation conduit (19), which has a pressure limiting device (20, 23′) and a filling device (23, 23′).

Abstract: By depressing a push button (13), a user deforms a flexible diaphragm (30) and thereby causes an incompressible fluid to flow from a first actuation-chamber segment (42) through openings (48) in a divider wall (46) and into a second chamber segment (44). That flow deforms a second flexible diaphragm (40), which accordingly causes an actuator shaft (58) to break the seal formed by an O-ring (57) and thereby permit flow from a main valve inlet (11) through a main valve outlet (12). When the user releases the push button (13), an actuator check valve (50) prevents the incompressible fluid from returning through the divider-wall openings (48) to the first chamber segment (42). The actuator therefore returns only slowly, through a bleed orifice (72). A pressurizer conduit (86) communicates the valve's outlet pressure to a stop chamber (82) and thereby causes the position of a stop member (76) to be dependent on that pressure.

Abstract: A fuel injector comprises a body having a longitudinal axis, a length-changin solid state actuator that has first and second ends, a closure member coupled to the first end of the solid state actuator, and a compensator assembly coupled the second end of the solid state actuator. The solid state actuator includes a plurality of solid state elements along the axis between the first and second ends. The closure member is movable between a first configuration permitting fuel injection and a second configuration preventing fuel injection. And the compensator assembly axially positions the solid state actuator with respect to the body in response to temperature variation. The compensator assembly utilizes a configuration of at least one spring disposed between two pistons so as to reduce the use of elastomer seals to thereby reduce a slip stick effect.

Abstract: In a control valve for an injector, having a first and second valve bodies in which a valve seat is embodied in the first valve body. A control spool which is displaceably disposed in the first valve body and has a valve face which cooperates with the valve seat. Such a structure requires very little effort or expense to make the control valve and to provide a hydraulic step-up chamber in the second valve body. The control spool is provided with a guide extension, whose outer diameter is approximately equal to or slightly less than the diameter of the valve seat, and that a guide bush is disposed in the valve body and the guide extension of the control spool is displaceably received in the guide bush, and the outer diameter of the guide bush is greater than or equal to the outer diameter of the control spool.

Abstract: A valve for controlling liquids for its actuation is provided with a liquid-filled coupling chamber, which is disposed between a step-up piston, actuatable by a piezoelectric actuator, and a piston that actuates a valve member. To compensate for leakage in the coupling chamber that is at high pressure, a filling valve is provided. The filling valve is disposed between the step-up piston and the piezoelectric actuator. Upon each return stroke of the piezoelectric actuator, the step-up piston follows the piezoelectric actuator with a time lag, so that the filling valve opens briefly and allows filling of the coupling chamber. The valves intended for use in fuel injection systems for internal combustion engines of motor vehicles.

Abstract: A valve for controlling fluids, which in order to be actuated, cooperates with a fluid-filled membrane actuator. A coupling chamber provided in the membrane actuator is sealed by two membranes as dividing walls. In order to compensate for fluid losses produced by pressure acting on the membrane actuator, a filling valve is provided, which is disposed in the region of one of the two membranes. A refilling of the membrane actuator during the closed phase of the control valve is assured by way of the filling valve. A filling of this kind can also compensate for length changes of the piezoelectric actuator, the valve, or the valve housing. The valve is designated for use in fuel injection devices for internal combustion engines of motor vehicles.

Abstract: A fuel injector has an actuator for generating a lifting movement and a lift translator filled with a hydraulic medium and deformable in the lifting direction, for transferring the lifting movement of the actuator to a valve needle, provision being made for a compensating chamber for the hydraulic medium, the compensating chamber being connected to an interior space of the lift translator via a throttle opening and enclosed by an elastic casing. Thus, temperature-related quasistatic deformations of actuator, lift translator, and/or valve needle can be compensated for by an exchange of the hydraulic medium between the interior space of the lift translator and the compensating chamber, while the comparatively fast lifting movements of the actuator are transmitted to the valve needle essentially without damping.

Abstract: An electromagnetic flow control device, or valve is provided. The valve uses two sets of stationary electromagnetic windings, with corresponding movable electromagnetic cores, which are completely contained within the flow stream of the valve. The movable cores are connected to a valve needle which can seal against a seat or open. The device is powered by electromagnetic energy only.

Abstract: An actuator utilizing the pressure of a gas is used to operate a diaphragm-operated control valve. An operating force generated by the actuator is varied by feeding and discharging a gas such as N2 through a narrow metallic tube. This is conducted by remote control, by means of electromagnetic valves provided in an environment at room temperature. The state of the control valve is monitored by a flow rate sensor which detects an actual flow rate of a fluid being controlled. Based on a signal representative of the detected actual flow rate, the electromagnetic valves for the actuator are controlled so that the fluid always flows at a desired flow rate. The gas such as N2 is heated by a heat exchanger in a high-temperature atmosphere in the vicinity of the actuator, to thereby prevent cooling of the fluid being controlled.

Abstract: A valve for controlling liquids which for its actuation is provided with a liquid-filled coupling chamber, which is disposed between an actuator piston of a piezoelectric actuator and a piston that actuates a valve member. To compensate for liquid losses suffered by the coupling chamber, which is briefly at high in each work cycle, the pressure difference that exists during the return stroke of the actuator piston between the coupling chamber and the opposite sides of the actuator piston and of the that actuates the valve member that are remote from the coupling chamber is utilized to achieve refilling in valveless fashion along gaps. The valve is used for use in fuel injection systems for internal combustion engines of motor vehicles.

Abstract: A valve for controlling fluids, which is provided with a fluid-filled coupling chamber that is disposed between an actuator piston of a piezoelectric actuator and a piston that actuates a valve member. In order to compensate for a leakage in the coupling chamber that is intermittently under high pressure during a switching procedure, a filling valve is provided that is disposed radially on the coupling chamber, but outside the chamber, and this valve monitors an inflow from an inlet conduit that is under ambient pressure in the valve. In this manner, on the one hand, the clearance volume produced by the attachment of the filling valve is very small and on the other hand, the filling valve is independent of the accelerated movements of the pistons, i.e., independent of their acceleration forces. The valve is designated for use in fuel injection devices for internal combustion engines of motor vehicles.

Abstract: A valve for controlling fluids which, for its actuation, is provided with a fluid-filled coupling chamber which can be brought to high pressure by virtue of the fact that the valve is disposed between an actuator piston of a piezoelectric actuator and a piston that actuates a valve member and it is used for force and path transmission. To compensate for a leakage in the coupling chamber, a filling valve is provided, which is disposed on the piston that actuates the valve member and is switched by this piston with each stroke of the device. In this manner, the coupling chamber contains a largely constant volume and can also compensate for slight fill level changes caused by temperature differences. The valve is designated for use in fuel injection devices for internal combustion engines of motor vehicles.

Abstract: A valve for controlling liquids, which for actuation cooperates with a hydraulic step-up piston bore. A pressure chamber provided in the step-up piston bore is sealed off by two pistons and two diaphragms downstream of the two pistons. To compensate for liquid losses in the pressure chamber caused by pressure exerted on the step-up piston bore, control chambers are formed downstream of the pistons and upstream of the diaphragms, and each of the control chambers are connected to a leaking oil bore via a respective throttle bore. The throttle bores have a sharp-edged transition in the relief direction for the control chamber, and a rounded transition in the filling direction for the control chamber, and as a result a minimum pressure for refilling the pressure chamber is always available. The valve is intended for use in fuel injection systems for motor vehicle internal combustion engines.

Abstract: A photoresist suck-back device is shown for a photoresist supply apparatus in a semiconductor device manufacturing system which prevents the accumulation of photoresist inside a photoresist spray line. The suck-back device is composed of a suck-back valve which is installed on a photoresist spray line connected to a photoresist supply line of a photoresist supply apparatus. The suck-back valve is constructed of a suction chamber for sucking the photoresist remaining within the photoresist spray line. The suction chamber is shrinkable and has a shape such that the sucked photoresist is not accumulated therein. A control part controls the size of the suction chamber of the suck-back valve through an air line. A cut-off valve is disposed between the photoresist supply line and the photoresist spray line which opens and closes the photoresist supply line under control of the control part through the air line.

Abstract: The invention concerns a device for operating a mechanism (5) of a rinsing fixture, in particular for operating a closing and opening mechanism or a locking mechanism of a rinsing fixture. It shows a float (28) and a first hydraulic or pneumatic force means (15) that shows a regulating unit (16) that is controllable through a float. A second hydraulic or pneumatic force means (9), which has a regulating unit (8) that is connected hydraulically or pneumatically with the regulating unit of the first force means, has an active connection with the mechanism (5).According to the invention it is planned that upon rising the float, in opposition to a restoring force, drives the regulating unit of the first force means for operating the mechanism, that the float upon sinking is uncoupled from the regulating unit of the first force means, and that a valve (12) is arranged in the connection (11, 13) of the two force means.

Abstract: A valve for controlling fluids, in which the valve member is adjusted by means of an actuating piston, which, together with a piezoelectric actuator piston, encloses a pressure chamber. In addition, the actuator piston and an affiliated piezoelectric stack are disposed in parallel radially next to the actuating piston, wherein upon excitation of the piezoelectric stack or adjustment of the actuator piston, the actuating piston executes a motion counter to the adjusting movement, and with its valve member, opens a relief bore.

Abstract: An actuator assembly for operating a setting member includes an actuator body undergoing a dimensional change upon applying electrical energy thereto; a preliminary pressure chamber for accommodating liquid; a diaphragm sealing the preliminary pressure chamber and being displaceable by the actuator body; a valve member carried by the diaphragm; a transfer chamber for accommodating liquid; and a displaceable plate body disposed in the preliminary pressure chamber and sealingly bounding the transfer chamber. The diaphragm, as it is moved by the actuator body, displaces the plate body. A displaceable piston body sealingly bounds the transfer chamber and has a surface which is smaller than the surface of the plate body, whereby the plate body--with the intermediary of the liquid--displaces the piston body to a greater extent than the displacement of the plate body. The piston body, as it moves, displaces the setting member.

Abstract: A wall-controllable primary drive, for example a piezo actuator, guided in a first bore transfers its stroke motion-commutated onto a secondary-side lifter element guided in a second bore, transmitting said stroke by a piston-hydraulic stroke transmission on the basis of a hydraulic chamber. The pressure in a valve chamber is controlled via secondary-side lifter element.

Abstract: A hydraulic drive urinal flushing system includes a hydraulic cylinder having a piston reciprocated therein and a piston rod upwardly extended from the piston, a weight sensor mounted on the piston rod outside the hydraulic cylinder, and a valve connected to the hydraulic cylinder by a pipe for controlling the supply of flushing water to a urinal, the hydraulic fluid being forced out of the hydraulic cylinder into the valve to open the valve for letting flushing water pass to the urinal when the user steps on the weight sensor, the hydraulic fluid being returned from the valve to the hydraulic cylinder when the piston is moved downwards from the elevation of the pipe, the hydraulic fluid being forced out of the hydraulic cylinder into the valve to open the valve for letting flushing water pass to the urinal again when the user leaves from the weight sensor.

Abstract: An improved fuel injector for an engine has a first passageway, a first outlet for the first passageway and a first fuel inlet for the first passageway. The injector further has a second passageway with a second outlet and a second fuel inlet. First and second pistons are movable within the first and second passageways. An apex chamber is defined by the first and second outlets of the first and second passageways. The injector has an outlet located downstream of the apex chamber. The first and second pistons are movable in the same direction simultaneously and expel fuel from the injector outlet.

Abstract: A system for turning off the flow of natural gas into a structure is used where the control is used on the exterior of the structure. The control is operated pneumatically and is connected by an air flow conduit to a valve that is located on a natural gas feed line in the interior of a structure.

Abstract: A hydraulic pressure booster is disclosed which, when used in conjunction with a control system for a subsurface safety valve, allows the use of lower pressure ratings on the wellhead equipment, yet at the same time provides sufficient hydraulic pressure to actuate a subsurface safety valve at depths that could exceed 4,000 feet. A preferred embodiment compensates for any fluid loss through the seals to ensure effective operation. The hydraulic pressure booster comprises an amplifier to receive fluid pressure from a fluid pressure source and magnify the pressure. A conduit system facilitates connection of the pressure source to the amplifier and the magnified pressure from the amplifier to the subsurface safety valve. The system is simple and self-regulating and can be alternatively installed as an integral portion of the subsurface safety valve or immediately adjacent the subsurface safety valve or immediately below the wellhead.

Abstract: A electrohydraulic stop device contains a piezoelectric actuator (P) which acts on two coupled hydraulic stroke transformers having identical transmission ratios. Essential components of the stop device are the pressure piston (DK) driven by the actuator (P), the lifting piston (HK) mounted axially displaceably in a cylindrical bore (ZY) of the pressure piston (DK), and a chamber (KB), into which open inflow and outflow ducts (B2, G2, B3, G3) for the medium to be shut off. By activating the actuator (P), the dumbbell-shaped lifting piston (HK) can be displaced virtually without delay in the pressure piston bore (ZY) and the inflow or outflow ducts (B2, B3) be closed.