Abstract: A valve seat is provided for use in a rotary valve for use in highly corrosive and abrasive applications. The valve seat includes a seat body adapted to selectively engage a portion of the floating ball element. The valve seat also includes a sealing element disposed in a first groove formed in the seat body and adapted to prevent fluid flow between the seat body and the valve body. The valve seat further includes a first bearing disposed in a second groove formed in the seat body, and a second bearing disposed in a third groove formed in the seat body, wherein the second and third grooves are formed immediately adjacent the first groove such that the first and second bearings are disposed immediately adjacent the sealing element.

Abstract: Aspects of the disclosure relate to a fluid connector mechanism having an opening therethrough. The mechanism may include a connector having a connector base portion and a piston portion including a piston housing and a piston. The opening may extend from the piston portion, through the piston, and through the connector base portion. The mechanism may also include a base having first and second pairs of O-rings arranged in first and second pairs of grooves, the opening further extending from one end of the base to another. The connector base portion and the base may be configured to engage with one another and create fluid-tight seals with the O-rings while the piston is arranged outside of the base.

Abstract: Provided is a condenser microphone unit that prevents eccentricity as much as possible and achieves improvement of assembly accuracy. A condenser microphone unit including a diaphragm that vibrates upon receiving a sound wave and made by a plurality of configuration components that are assembled, the condenser microphone unit includes a base member including an opening portion to which the plurality of configuration components is attached, and an adjustment member having an outer diameter corresponding to a diameter of the opening portion, and mounted to a side surface of one or more components accommodated in the opening portion, of the plurality of configuration components. The adjustment member is a frame body exhibiting an annular shape and including a notch portion notched to have a pair of end portions, and is fixed in the opening portion in a state of being mounted to the side surface of the one or more components.

Abstract: Re-treatment of a formation having a wellbore, which can be an open hole or a cased hole lined with casing, involves deploying a tubing string in the casing having tools disposed at intervals thereon. The tools position on the tubing string, and the tubing string with the tools thereon is inserted into the casing. Biasing rings of the tools passively engage with the casing. The annulus is accessed between the tubing string and the casing at the intervals between the tools. For example, sliding sleeves on the tubing string can be opened (selectively), or new plug and perforation operations can be used to create perforations in the tubing string at desired intervals between the tools. With access achieved, retreatment is pumped down the tubing string, out the access to the annulus, and at least partially sealed by the engaged rings in the intervals between the tools.

Abstract: In a fluid pressure apparatus, a packing is constituted from an annular seal member made of an elastic rubber material, and support rings made of a material possessing low friction, which are mounted on an outer circumference of the seal member. The seal member includes, on an outer circumference thereof, a sealing projection, shoulder portions formed on both sides of the sealing projection, and concave grooves interposed between the shoulder portions and the sealing projection. The support rings include support surfaces on outer circumferences thereof, and engagement projections on inner circumferences thereof, such that by engagement of the projections in the concave grooves, the support rings are mounted on the seal member so as to surround outer circumferences of the shoulder portions.

Abstract: A combined oil ring includes an oil ring having upper and lower rails formed integrally at an outer circumferential side of the oil ring to slide on a cylinder wall; a coil expander installed at an inner circumferential side of the oil ring to force the oil ring radially outwards; and a side rail installed at an upper side of the oil ring and having no torsion along an axial direction of the oil ring.

Abstract: An oil-control ring for an internal combustion engine, to be mounted between the sidewalls of a respective groove (10) of a piston (P) and comprising two ring segments (20) and an annular expander (30) disposed between the two ring segments (20) and presenting a support body (31) defining a seating plane for each ring segment (20), the ring further comprising: at least one expander portion (40) axially projecting from the support body (31) of the expander (30), beyond at least one of the seating planes of a ring segment (20); and at least one superficial irregularity (50) provided in at least one of the ring segments (20) and which is dimensioned to be contained in the thickness of the respective ring segment (20) and to interfere with at least one expander portion (40), in order to rotatively lock said ring segment (20) in relation to the expander (30).

Abstract: A seal assembly for a groove or seal gland in a relatively displaceable machine part for sealing an axial machine part extending therethrough comprises a pair of annular seal elements and a support element disposed between the annular elements and radially extending wall of said groove. The annular seal elements have an axial slot therein and a key portion extending therefrom, shaped to engage the axial slot. The seal elements are arranged in an inverted nesting relationship to provide superior sealing characteristics when biased toward the machine part by said support element.