Abstract: A lubricant dosing device for a gaseous fuel delivery system of an internal combustion engine, in particular a hydrogen engine, includes a body having therein a pumping bore extending along a pumping axis and defining, at an end, a pumping chamber which volume is varied by a piston reciprocating in the pumping bore. An inlet valve assembly is arranged in an inlet section. An outlet section includes an outlet valve assembly to control the discharge of pressurized lubricant fluid from the pumping chamber. The outlet valve assembly is configured as a check-valve with an outlet valve seat and an outlet valve member downstream thereof. The outlet valve member includes a sealing surface adapted to cooperate with the outlet valve seat the sealing surface being formed of or coated with a resilient polymer.

Abstract: A tubular component for a pressurised-water nuclear reactor, has the following composition by weight: 0.8%?Nb?2.8%; traces?Sn?0.65%; 0.015%?Fe?0.40%; preferably 0.020%?Fe?0.35%; traces?C?100 ppm; 600 ppm?O?2300 ppm; preferably 900 ppm?O?1800 ppm; 5 ppm?S?100 ppm; preferably 8 ppm?S?35 ppm; traces?Cr+V+Mo+Cu?0.35%; traces?Hf?100 ppm; F?1 ppm; the remainder being zirconium and impurities resulting from production. The tubular component has an outer surface with a roughness Ra less than or equal to 0.5 ?m, obtained following a final mechanical polishing step. The outer surface has a roughness Rsk?1 in absolute value and a roughness Rku?10.

Abstract: A combined assembly for filtering and calibrating a fuel injector arranged in an internal combustion engine, the combined filtration and calibration assembly extending along a longitudinal axis and comprising a calibration sleeve provided with a longitudinal bore and defining a multitude of filtration holes. The combined filtration and calibration assembly has a calibrated opening in the bore.

Abstract: A method for producing a pintle for a fuel injector, which pintle extends in an axial direction and has a pintle perch with a perch radius as a maximum radial dimension and a pintle shaft with a shaft radius as a maximum radial dimension smaller than the perch radius. The method comprises: providing a metal workpiece; and performing at least one metal forming operation on the workpiece to change the radial dimension of at least a portion of the workpiece. The at least one forming operation comprises axially compressing a portion of the workpiece, whereby the portion radially expands, wherein expanding the portion is used for creating the pintle perch.

Abstract: A combined assembly for filtering and calibrating a fuel injector arranged in an internal combustion engine, the combined filtration and calibration assembly extending along a longitudinal axis and comprising a calibration sleeve provided with a longitudinal bore and defining a multitude of filtration holes. The combined filtration and calibration assembly has a calibrated opening in the bore.

Abstract: A tubular component for a pressurised-water nuclear reactor, has the following composition by weight: 0.8%?Nb?2.8%; traces?Sn?0.65%; 0.015%?Fe?0.40%; preferably 0.020%?Fe?0.35%; traces?C?100 ppm; 600 ppm?O?2300 ppm; preferably 900 ppm?O?1800 ppm; 5 ppm?S?100 ppm; preferably 8 ppm?S?35 ppm; traces?Cr+V+Mo+Cu?0.35%; traces?Hf?100 ppm; F?1 ppm; the remainder being zirconium and impurities resulting from production. The tubular component has an outer surface with a roughness Ra less than or equal to 0.5 ?m, obtained following a final mechanical polishing step. The outer surface has a roughness Rsk?1 in absolute value and a roughness Rku?10.

Abstract: A coil assembly in a fuel injector includes a magnetic core and; a winding wound around the core, the winding being overmoulded and forming a cylindrical overmoulding. An axial blind hole extends towards the interior of the coil assembly from a first surface to a distal end, the blind hole being suitable for housing at least one spring for loading a magnetic armature. The coil assembly is provided with a degassing hole passing through the core and the overmoulding from the blind axial hole to an axial outer cylindrical surface, the degassing hole being provided in the magnetic core and having a restriction that is arranged in a first section that is proximal to the blind axial hole.

Abstract: A fuel injector includes a needle that can move between an entirely open position and a closed position is provided with a device for identifying the position of the needle, in which an electrical circuit is closed in the two extreme positions, the needle being in electrical contact with ground, the circuit being open in any other intermediate position of the needle, the needle not being grounded.

Abstract: A subassembly for a high pressure fuel injector control valve includes a control valve member and a sleeve attached to a stem of the control valve member, the sleeve extending along at least a partial axial length of the stem of the control valve member, and wherein a clearance, provided between the sleeve and the control valve member, is in fluid communication with the control chamber such that during use, pressure compensation occurs, as the sleeve is caused to expand and seal against the control valve bore, thereby preventing leakage of fuel within the control valve assembly.

Abstract: A coil assembly in a fuel injector includes a magnetic core and; a winding wound around the core, the winding being overmoulded and forming a cylindrical overmoulding. An axial blind hole extends towards the interior of the coil assembly from a first surface to a distal end, the blind hole being suitable for housing at least one spring for loading a magnetic armature. The coil assembly is provided with a degassing hole passing through the core and the overmoulding from the blind axial hole to an axial outer cylindrical surface, the degassing hole being provided in the magnetic core and having a restriction that is arranged in a first section that is proximal to the blind axial hole.

Abstract: A control valve assembly for controlling fuel pressure in a control chamber of a fuel injector. The control valve assembly comprising a valve member arranged in a bore provided in a valve housing, at least one of the valve member and the valve housing being moveable with respect to the other, wherein the valve member comprises a fuel-receiving cavity arranged to receive fuel that distorts at least a portion of the valve member so as to increase an external dimension thereof.

Abstract: In one aspect an apparatus for use in a wellbore is disclosed that in one non-limiting embodiment includes a completion assembly that contains a filter section having a tubular with a plurality of through holes filled with a filter material for restricting flow of solid particles through the holes for placement of the filter section across from a zone along the wellbore, a sensor inside the tubular for providing information about a parameter of interest during treatment of and/or production from the zone into the tubular, and a first circuit coupled to the sensor that transmits wireless signals corresponding to measurements made by the sensor to a second circuit that transmits the received signals to the surface.

Abstract: A subassembly for a high pressure fuel injector control valve includes, a control valve member and a sleeve attached to a stem of the control valve member, the sleeve extending along at least a partial axial length of the stem of the control valve member, and wherein a clearance, provided between the sleeve and the control valve member, is in fluid communication with the control chamber such that during use, pressure compensation occurs, as the sleeve is caused to expand and seal against the control valve bore, thereby preventing leakage of fuel within the control valve assembly.

Abstract: A fuel injector (10) comprising a needle (16) that can move between an entirely open position (PO) and a closed position (PF) is provided with a device (82) for identifying the position of the needle, in which an electrical circuit (84) is closed in the two extreme positions (PO, PF), the needle (16) being in electrical contact with the ground (G), the circuit (84) being open in any other intermediate position (Pi) of the needle (16), the needle (16) not being grounded (G).

Abstract: A fuel injector includes fixed metal components, in particular an injector body, a solenoid actuator equipped with a retaining spring that holds a control valve stem, a control valve body including a seat for the control valve stem, a spacer between the body of the control valve and an injection nozzle, a control chamber, and an injection needle seat. The fuel injector also includes movable metal components, in particular the control valve stem and an armature thereof and an injection needle. Surfaces of the metal components that are in contact with one another are contact surfaces. Resistive surface coatings are arranged on a number of the contact surfaces. The overall electrical resistivity of the injector between the body of the solenoid actuator and the body of the injector varies by at least three distinct ohm values intermittently according to the kinetics of the injection needle of the injector.

Abstract: The present invention relates to a control valve for a fuel injector. The control valve has a control valve body which defines a supply passage for high pressure fuel. A control chamber and a pressure compensating chamber are provided in the control valve. The control chamber and the pressure compensating chamber are both in fluid communication with the supply passage. A control valve member is provided for controlling fuel pressure in the control chamber. The pressure compensating chamber is spaced radially outwardly from the control chamber. The invention also relates to a control valve member having a pressure compensating cavity.

Abstract: A nozzle assembly of a fuel injector extends along a main axis and includes a nozzle body provided with an inner space divided in upstream chamber and downstream chamber and also with, a valve needle including a main elongated shaft slidably guided in said inner space and extending through-out both upstream and downstream chambers. The nozzle body and the valve needle cooperate to define throttle fluid communication means between upstream and downstream chambers inducing, in use, a pressure drop when fuel flows through. The nozzle assembly is further provided with a tubular sleeve arranged between the upstream chamber and the downstream chamber in abutment against a face of the body and being radially self-centred guided by a cylindrical face of the needle, the throttle means being arranged in said sleeve.

Abstract: An apparatus for estimating at least one parameter includes: a deformable member configured to deform in response to the at least one parameter; a housing surrounding at least a portion of an external surface of the deformable member to define an isolated region around the portion and an isolated surface of the deformable member; and at least one optical fiber sensor disposed on the isolated surface and held in an operable relationship with the isolated surface, the at least one optical fiber sensor configured to generate a signal in response to a deformation of the deformable member.

Abstract: A fuel injector includes fixed metal components, in particular an injector body, a solenoid actuator equipped with a retaining spring that holds a control valve stem, a control valve body including a seat for the control valve stem, a spacer between the body of the control valve and an injection nozzle, a control chamber, and an injection needle seat. The fuel injector also includes movable metal components, in particular the control valve stem and an armature thereof and an injection needle. Surfaces of the metal components that are in contact with one another are contact surfaces. Resistive surface coatings are arranged on a number of the contact surfaces. The overall electrical resistivity of the injector between the body of the solenoid actuator and the body of the injector varies by at least three distinct ohm values intermittently according to the kinetics of the injection needle of the injector.

Abstract: In one aspect an apparatus for use in a wellbore is disclosed that in one non-limiting embodiment includes a completion assembly that contains a filter section having a tubular with a plurality of through holes filled with a filter material for restricting flow of solid particles through the holes for placement of the filter section across from a zone along the wellbore, a sensor inside the tubular for providing information about a parameter of interest during treatment of and/or production from the zone into the tubular, and a first circuit coupled to the sensor that transmits wireless signals corresponding to measurements made by the sensor to a second circuit that transmits the received signals to the surface.