A shockwave-inducing mechanical rotating shaft seal includes a seal face gap having at least one section of converging and then diverging gap width that supersonically accelerates compressible fluid escaping through the seal gap, thereby causing a shockwave that reduces the fluid pressure and provides a high pressure fluid seal with significantly reduced viscous heating and gap width. A plurality of the converging-diverging sections can be provided, having a combined width between 0.004 and 0.008 inches. The converging-diverging sections can be configured to accelerate the fluid to a Mach number less than 4. The gap can further include a section of flat, parallel seal faces that induce viscous stresses in the fluid, thereby further reducing the fluid pressure. The seal can be configured with axially directed seal faces or radially directed seal faces, and/or used as a pre-conditioner in combination with a conventional downstream mechanical fluid seal.

A material supply assembly includes a valve assembly having an outer valve member and an inner valve member rotatable relative to the outer valve member. A base assembly includes an base structure and an actuator. An engagement structure is operative between the outer valve member and the actuator to prevent relative movement between the outer valve member and the actuator. A locking structure is operative between the inner valve member and the base structure to prevent relative movement between the inner valve member and the base structure. Movement of the actuator relative to the base structure moves the outer valve member relative to the inner valve member to operate the valve assembly.

Sealing assemblies with rolling annular seals are provided. In one embodiment, an apparatus includes a stuffing box having a rolling seal positioned in a body for sealing against a tubing or wireline cable received in a bore of the body. The rolling seal can rotate within the body to roll along the tubing or wireline cable in response to movement of the tubing or wireline cable through the body and friction between the rolling seal and the tubing or wireline cable. Additional systems, devices, and methods are also disclosed.

Sealing assemblies with rolling annular seals are provided. In one embodiment, an apparatus includes a stuffing box having a rolling seal positioned in a body for sealing against a tubing or wireline cable received in a bore of the body. The rolling seal can rotate within the body to roll along the tubing or wireline cable in response to movement of the tubing or wireline cable through the body and friction between the rolling seal and the tubing or wireline cable. Additional systems, devices, and methods are also disclosed.

A receiving device for a system for inductive power transmission has a housing with a cover part and a base part as housing parts. The housing has an internal volume for receiving at least one winding structure. One of the housing parts has at least one rib and the other housing part has at least one groove for receiving the at least one rib. The at least one rib and the at least one groove are arranged between the internal volume and an external volume. The receiving device has at least one sealing element. At least one portion of the at least one rib and at least one portion of the at least one sealing element are arranged in at least one portion of the at least one groove. A method for producing the receiving device is also disclosed.

A sealing ring provides a fluid seal between a first flange and a second flange. The sealing ring forms a tubular element and includes a tapering wall member defining an interior funnel-shaped through-going opening extending axially and tapering from a proximal end to a distal end. The tapering wall member is made from a resilient material proving an axial deflection of the tapering wall member when exposed to an axial force.

A sealing ring provides a fluid seal between a first flange and a second flange. The sealing ring forms a tubular element and includes a tapering wall member defining an interior funnel-shaped through-going opening extending axially and tapering from a proximal end to a distal end. The tapering wall member is made from a resilient material proving an axial deflection of the tapering wall member when exposed to an axial force.

A seal structure that keeps a needle from sliding with respect to a seal and is easily detachable, and a device having the seal structure. A needle of a valve device is inserted through a seal. A valve device includes a fluid chamber having an outflow hole and au inflow hole, and the needle of which fore end reciprocates in the fluid chamber. The seal includes a main body made of an elastic body having a needle fitting insertion hole formed for the needle to be inserted and fit into. A flange portion is made of an elastic body annularly extending from the main body in a radial direction outward. One end opening diameter (D.sub.3) of the needle fitting insertion hole is smaller than the other end opening diameter (D.sub.2) of the needle fitting insertion hole.

Embodiments of the invention relate to a turbine assembly including a shroud assembly and a nozzle assembly axially adjacent to each other which both include confronting radial sides and confronting axial ends. A spline connector having a circumferential portion and an axial portion such that the circumferential portion of the spline connector extends across the axial ends and the axial portion of the spline connector extends across the confronting radial sides.

Embodiments of the invention relate to a turbine assembly including a shroud assembly and a nozzle assembly axially adjacent to each other which both include confronting radial sides and confronting axial ends. A spline connector having a circumferential portion and an axial portion such that the circumferential portion of the spline connector extends across the axial ends and the axial portion of the spline connector extends across the confronting radial sides.