Abstract: This application describes systems for protecting steel fluid end body flow passages from direct impingement by high pressure fracking fluid. These fluid end body flow passages are protected by components in the form of cartridges and sleeves, This disclosure also describes kits and methods which utilize these systems to provide enhanced erosion and corrosion resistance as well as improved fatigue properties and extended service life to these fluid ends.

Abstract: A sliding element, in particular a piston ring or a cylinder liner, comprising at least one a-C:H:Me layer, where Me is germanium and silicon, having a layer thickness of 10-40 ?m, is provided.

Abstract: Disclosed is a cylinder liner having a high bonding strength to a cylinder block. Further disclosed is a method for producing the same. The cylinder liner uses a silicon-aluminum alloy as a material; a plurality of protrusions are formed on the external surface thereof; and the protrusions each contain a pillar section extending from the external surface, and a head section formed at the end of the pillar section.

Abstract: There is provided a cylinder apparatus consisting of a cylinder, a piston performing reciprocating motion between a top dead point and a bottom dead point with oscillatory movement in the cylinder, wherein the cylinder has an oscillatory distance between the top dead point and the bottom dead point, which is shorter than the oscillatory distance at the top and bottom dead points.

Abstract: The present invention relates to a cylinder liner and a method of manufacturing the cylinder liner. A cylinder liner according to the present invention has an outer surface covered by casting metal when a cylinder block is manufactured by integral casting, in which a plurality of engraved grooves is formed throughout the outer surface of the cylinder liner to increase bonding force between the casting metal and the outer surface of the cylinder liner.

Abstract: An arrangement (10) for the fixing of an axially oriented (A) brake booster (12) on a dashboard (14) of an automobile wherein a rear face (16) of the booster (12) is fixed on a front face (18) of the dashboard (14) through a first bayonet fitting (26) interposed between the rear face (16) of the booster (12) and the front face (18) of the dashboard (14) to prevent the brake booster (12) from rotating.

Abstract: A hydrostatic machine with a cylinder block (6), within which sleeve holes (28b) are arranged, in which sleeves (28) sit, surrounding piston bores (28a) in which pistons (29) are mounted, such as to be displaced back and forth and the pistons (29) extend into the cylinder block (5) such as to define cylinders (26) with the front ends thereof. According to the invention, the risk of piston seizure can be reduced, whereby the sleeves (28) comprise an axially-defined recess (41) in the outer surface thereof, in the region facing away from the cylinder and the region with the greatest piston radial force, pressing the pistons (29) against the wall of the piston bore.

Abstract: The present invention comprises an improved steering rack in which sliding sleeves within the main cylinder allow a channel to be cut through the main cylinder to allow for passage of the stationary piston attachment pin without allowing hydraulic fluid to leak through the channel.