An intermediate discharge port in a scroll compressor and a method for controlling part-load efficiency of a scroll compressor are disclosed. The compressor includes a compressor housing; a non-orbiting scroll member and an orbiting scroll member forming a compression chamber; a discharge port for receiving a compressed fluid; and an intermediate discharge port fluidly connected between the compression chamber and the discharge port, the intermediate discharge port including a sealing member, fluid flow being prevented between the compression chamber and the discharge port through the intermediate discharge port when in a flow-blocked state, and fluid flow being enabled between the compression chamber and the discharge port through the intermediate discharge port when in a flow-permitted state.

An oil-lubricated slide vane rotary vacuum pump with a slide vane unit, and with an oil separating and reconditioning device, wherein oil and gas are separated by separating devices, possibly complemented by oil coolers and/or oil pumps. One or more monitoring and/or servicing devices are provided, and the oil separating and reconditioning device is installed in an oil separating and reconditioning housing. Side walls extend transversely to a plane of rotation of a slide vane rotor, and define a longitudinal extent of the oil separating and reconditioning housing. The one or more monitoring and/or servicing devices are arranged only in one or more cover parts which are attached to one or both end walls of the oil separating and reconditioning housing. The oil separating and reconditioning housing is formed with the side walls, the bottom wall and the top wall without being configured for a monitoring and/or servicing device.

A refurbishment process for a volumetric screw compressor of the oil-free type, which comprises a male rotor and a female rotor, is described. The process comprises visually checking the wear condition of the rotors, treating their surface for removing the previous coating, and applying a new coating on the surface. The composition of the coating applied on the surface of the rotors consists of the following materials: TABLE-US-00001 Material Amount (g) Polytetrafluoroethylene 750 850 (954G 303 C Teflon, DuPont) Amorphous graphite powder 300 400 Thinner for spray cleaning apparatuses 200 270 (8595 thinner, DuPont) Methyl ethyl ketone (MEK) 170 220 Cellosolve acetate coating additive 200 300 (Syn Fac 800 resin).

An oil-flooded screw compressor system includes: a first lubricating oil supply system for supplying lubricating oil to screw parts; and a second lubricating oil supply system for supplying the lubricating oil to a bearing. The first lubricating oil supply system includes: a gas-liquid separator; a first supply flow passage; and a first supply path. The second lubricating oil supply system includes: a lubricating oil reservoir; a second supply flow passage; a second supply path; a first discharge flow passage; and a discharge path. It is possible to suppress dissolution of a gas to be compressed in lubricating oil and to suppress damage to a bearing due to deterioration of the performance of the lubricating oil, even in a case where the gas to be compressed is compatible with the lubricating oil.

A transmission pump is be removed from service and remanufactured into a remanufactured transmission pump. A first gear assembly is removed from the pump. A bore of the pump is machined from a first depth to a greater second depth. A second gear assembly is installed in the machined bore. The second gear assembly has a same horizontal geometry and a greater axial depth than the first gear assembly.

The invention relates to a screw spindle pump, with a housing (2) which surrounds a delivery chamber (5), two spindles (7, 8), namely a drive spindle (7) and an opposed running spindle (8), a housing insert (6) which is arranged in the housing (2) and in which the spindles (7, 8) are accommodated, at least one bearing element (13, 13), which is connected to the housing insert (6) and on which bearings (12) of the spindles (7, 8) are arranged, and with at least one housing cover (14, 14), closing a housing opening. It is the object of the invention to provide a screw spindle pump at which maintenance and inspection work can be carried out more simply and cost-effectively. The invention achieves this object in that the bearing element (13, 13) together with the housing insert (6) and the spindles (7, 8) accommodated therein forms a unit (15) which, after the housing cover (14, 14) is taken off, is removable from the housing (2) through the housing opening.

An improved repair method and repair kit for gerotor pumps that have become damaged or worn in order to allow the pump to create a sound seal once more.

In a pump head for a scroll pump, an orbiting scroll is coupled to a crank of a crankshaft. As the crankshaft rotates, the crank drives the orbiting scroll to orbit relative to one or more fixed scrolls to pump fluid from an inlet to an outlet. A stub shaft is attached to the crank and may be removed as part of an at least partial disassembly of the pump head. An adjusting nut may adjust an axial position of the orbiting scroll relative to the fixed scroll(s). The adjusting nut may be removed, and thereafter reinstalled, together with the stub shaft without altering an axial position of the adjusting nut relative to the stub shaft.

Apparatuses and methods are provided for a hybrid gear-and-rotor pump. A pump includes a faceplate assembly, a backplate assembly, a main case with a chamber, and a hybrid gear-and-rotor assembly. The hybrid gear-and-rotor assembly includes a first shaft and a second shaft. The first and second shafts are configured to extend through the chamber into bores in the faceplate and backplate assemblies. The first shaft includes a first gear and a first rotor mounted for rotation on the first shaft within the chamber. The second shaft includes a second gear and a second rotor mounted for rotation on the second shaft within the chamber. The first gear is intermeshed with the second gear, and the first rotor is intermeshed with the second rotor, so as to transfer fluid from a suction port of the main case to the discharge port during rotation of the first and second shafts.

Systems and methods described herein provide composite slug-bearings to support rotating shafts and provide for adaptable pump configurations in a positive-displacement pump. A main bearing surface is configured to make direct contact with the rotating shaft and may be in the form of a rolling element bearing, plain journal bearing, or flanged journal bearing. A slug houses the main bearing surface and serves to occupy volume within the pump housing. The slugs are also used to locate and/or position the bearing within the housing, which will position the shafts. Multiple composite slug-bearings may be interchangeably located within the gear chamber of a pump for proper shaft placement. The composite slug-bearings also affect the volumetric displacement of the pump. The size of the slug is selected to allow relatively smaller gears to operate within a relatively larger housing while still maintaining the minimal clearances that are required for positive-displacement machines.