A drive system for a cryogenic pump is provided including a spool housing having a plurality of valves disposed therein about a pump axis and a tappet housing including a plurality of tappet bores, each tappet bore in communication with a respective one of the plurality of valves. A collection cavity collects hydraulic fluid from the tappet bores. A pump flange includes a fluid inlet and a fluid outlet. An inlet manifold directs hydraulic fluid received through the fluid inlet to each of the plurality of valves. An outlet manifold directs hydraulic fluid from each of the valves and the collection cavity to the fluid outlet.

The pump can have a support having a guide extending around an axis, a radial position of the guide relative the axis varying around the axis, and a first oil passage formed in the support; a rotary assembly mounted to the support via support bearings, and rotatable around the axis, the rotary assembly having a second oil passage and a cylinder, the cylinder extending radially relative the axis, an inlet port fluidly connecting the first oil passage to the cylinder, and an outlet port fluidly connecting the cylinder to the second oil passage, and a piston slidingly mounted in the cylinder, a radially-outer end of the piston further slidingly engaged with the guide.

A self-energizing valve includes a valve body defining an inner chamber having an inlet and an outlet. A valve head within the inner chamber is moveable between a first position and a second position. A valve seal in fluid communication with the inlet has a sealing surface with a sealing member between the valve head and the valve seal. The sealing member is movable between a closed position where the sealing member engages with the sealing surface and an open position where the sealing member disengages from the sealing surface to allow flow through the inlet into the inner chamber. A cam is coupled to the valve head. Rotation of the cam causes movement of the valve head between the first position and the second position to move the valve head to the first position to hold the sealing member in the closed position.

A radial piston pump for delivering a pressure medium to a consumer may include a housing in which cylinder bores are arranged radially to a longitudinal axis and in each of which a radially displaceable piston is arranged. The pistons form a piston row lying in a radial plane. The radial piston pump furthermore has an eccentric shaft arranged coaxially to the longitudinal axis which sets the pistons in a linearly oscillating reciprocating motion, wherein pressure medium flows into cylinder chambers through suction openings formed in the piston in the region of a bottom dead centre of the stroke movement, from a suction chamber which is supplied with pressure medium through a suction port. The pressure medium flows out of the cylinder chambers to a pressure outlet through pressure openings owing to movement of the pistons towards the top dead centre. At least one further piston row is provided planar-parallel to the piston row. Further cylinder bores are provided in the housing, in each of which a piston of the further piston row is radially displaceably arranged. The eccentric shaft sets the pistons of the further piston row in a linearly oscillating reciprocating motion.

The invention relates to a fluid compression apparatus (1) comprising a sealed enclosure (13) intended to contain a bath (16) of cryogenic fluid, a first (3) and a second (4) compression chambers, an intake system (2) for admission into the first chamber (3), a system (6) for transfer from the first (3) to the second (4) chamber, the apparatus (1) further comprising a communicating discharge orifice (7) for compressed fluid to leave the second chamber, the apparatus (1) further comprising a discharge orifice provided with a valve (9) for discharge from the first compression chamber (3) to the bath (16) so as to let surplus liquid leave during compression of fluid in the first chamber (3), the discharge orifice communicating with the enclosure (13) via at least one flow retarder (10) configured to attenuate the speed and/or intensity of the discharged liquid flow by limiting its pressure drop.

Systems and methods are disclosed for a valveless, mechanical, pressure regulating pump for use in transmissions and other mechanical systems. The pressure regulating pump may comprise: a casing; a pump body comprising an outer cylindrical portion and an inner cylindrical portion, wherein the outer cylindrical portion includes one or more inlet ports and the inner cylindrical portion includes one or more outlet ports; a piston interposed between the outer cylindrical portion and the inner cylindrical portion and configured to move axially, the piston and the inner cylindrical portion defining a chamber; a first spring at least partially interposed between the piston and the inner cylindrical portion; and a second spring interposed between the casing and the pump body, wherein the pump body is configured to move axially relative to the casing and compress the second spring when a pressure in the chamber exceeds a pre-load of the second spring.

The invention relates to a fluid compression apparatus comprising a sealed enclosure intended to contain a bath of cryogenic fluid, a first and a second compression chambers, an intake system for admission into the first chamber, a system for transfer from the first to the second chamber, the apparatus further comprising a communicating discharge orifice for compressed fluid to leave the second chamber, the apparatus further comprising an overflow discharge orifice provided with a valve for discharge from the first compression chamber to the bath so as to let surplus liquid leave during compression of fluid in the first chamber, the overflow discharge orifice communicating with the enclosure via at least one flow retarder configured to attenuate the speed and/or intensity of the discharged liquid flow by limiting its pressure drop.

The invention relates to a fluid compression apparatus comprising a sealed enclosure intended to contain a bath of cryogenic fluid, a first and a second compression chambers, an intake system for admission into the first chamber, a system for transfer from the first to the second chamber, the apparatus further comprising a communicating discharge orifice for compressed fluid to leave the second chamber, the apparatus further comprising an overflow discharge orifice provided with a valve for discharge from the first compression chamber to the bath so as to let surplus liquid leave during compression of fluid in the first chamber, the overflow discharge orifice communicating with the enclosure via at least one flow retarder configured to attenuate the speed and/or intensity of the discharged liquid flow by limiting its pressure drop.

Methods and systems for a mechanically driven pump are provided. The mechanically driven pump may apply a piston simultaneously to operate as a guillotine blocking valve and a component to transfer motive force. A spring may apply a force to the piston to oppose a force that is applied to the piston via a cam lobe. The mechanically driven pump exhibits a differential pressure at a calibrated orifice during two working phases of the pump (expansion and compression), which provides for a non-zero volumetric efficiency of the mechanically driven pump.

Methods and systems for a mechanically driven pump are provided. The mechanically driven pump may apply a piston simultaneously to operate as a guillotine blocking valve and a component to transfer motive force. A spring may apply a force to the piston to oppose a force that is applied to the piston via a cam lobe. The mechanically driven pump exhibits a differential pressure at a calibrated orifice during two working phases of the pump (expansion and compression), which provides for a non-zero volumetric efficiency of the mechanically driven pump.