The invention relates to a fluid-compression device including a compression chamber comprising a movable piston, the device comprising a first end housing a first end of the compression chamber, the device comprising a second end housing a second end of the compression chamber, the piston being translatable between the first and second ends of the compression chamber, the device comprising a regeneration pipe connecting the first and second ends of the compression chamber and including a regenerator, the device comprising a supply pipe comprising an upstream end intended to be connected to a source of fluid to be compressed and a downstream end opening into the first end of the compression chamber, the supply pipe comprising a valve assembly, the device comprising a pipe for discharging the compressed fluid comprising an upstream end connected to the compression chamber and a downstream end intended to be connected to a receiver of the compressed fluid, the discharge pipe comprising a valve assembly, characterized in that the upstream end of the supply pipe is connected directly to the first end of the compression chamber, i.e. without passing through a pre-compression chamber in the first end of the device.

A flange for a pump comprises first and second faces and a passageway for cryogenic fluid flow extending from the first face to the second face and at least one of (1) the passageway is for a pipe and comprises a first portion of a first diameter and a second portion of a second diameter greater than the first diameter, wherein when the pipe has an outer diameter that is smaller than the second diameter a gap is formed between the pipe and the passageway where the pipe passes through the second portion; and (2) a first annular groove in one of the first face and the second face and extending around the passageway, wherein the first annular groove in cooperation with the passageway forms a bellows. The gap and bellows increase the thermal resistance between the passageway and the flange, and the bellows allows for flexure during thermal contractions of the flange reducing thermal stress on welded fluid seals.

The present invention relates to a fuel pump (1) which comprises a pump housing (2), a delivery element (3) for delivering fuel, a heat-generating actuator (4) for actuating the delivery element (3), a first fuel path (5) which leads from an inlet (20) to a delivery space (7), and a second fuel path (6) which leads from the inlet (20) past the heat-generating actuator (4) to a first housing opening (21), wherein the first housing opening (21) is arranged above the inlet (20) in the vertical direction (V). The present invention also relates to a fuel pump arrangement which comprises a fuel pump (1) according to the invention and a fuel tank (10) in which the fuel pump (1) is at least partially and preferably entirely arranged. The present invention also relates to a method for operating a fuel pump (1).

A high-pressure pump is configured to pressurize fuel. The high-pressure pump includes a relief valve device that is placed in a relief passage, which has one end part connected to a discharge passage in a housing while another end part of the relief passage is configured to be communicated with a suction passage in the housing. The discharge passage is configured to conduct the fuel, which is pressurized in and discharged from a pressurizing chamber. The relief valve device is configured to enable or limit a flow of the fuel between one side of the relief passage, at which the discharge passage is located, and another side of the relief passage, which is opposite to the discharge passage, at a valve opening time or a valve closing time of the relief valve device.

A high-pressure pump is configured to pressurize fuel. The high-pressure pump includes a relief valve device that is placed in a relief passage, which has one end part connected to a discharge passage in a housing while another end part of the relief passage is configured to be communicated with a suction passage in the housing. The discharge passage is configured to conduct the fuel, which is pressurized in and discharged from a pressurizing chamber. The relief valve device is configured to enable or limit a flow of the fuel between one side of the relief passage, at which the discharge passage is located, and another side of the relief passage, which is opposite to the discharge passage, at a valve opening time or a valve closing time of the relief valve device.

A method for increasing the available net positive suction head (NPSHa) for a cryogenic pump is provided. In one embodiment, the method can include the steps of: increasing a pressure within a liquid storage tank to at least a pumping set point, wherein the pumping set point is configured to cause the NPSHa to exceed the NPSHr; starting the cryogenic pump, thereby sending liquid from within the liquid storage tank through the pump and to an end user; stopping the cryogenic pump, thereby stopping flow of the liquid from the liquid storage tank; and resetting the pressure within the liquid storage tank to at least a storage set point.

A method for increasing the available net positive suction head (NPSHa) for a cryogenic pump is provided. In one embodiment, the method can include the steps of: increasing a pressure within a liquid storage tank to at least a pumping set point, wherein the pumping set point is configured to cause the NPSHa to exceed the NPSHr; starting the cryogenic pump, thereby sending liquid from within the liquid storage tank through the pump and to an end user; stopping the cryogenic pump, thereby stopping flow of the liquid from the liquid storage tank; and resetting the pressure within the liquid storage tank to at least a storage set point.

A gas displacement assembly includes a storage container, a pump that pumps a pressurized gas material into the storage container, a cooling chamber that houses a coolant and cools the gas material to a cryogenic temperature, and a coolant line that transports coolant through the cooling chamber to cool the gas material.

The present invention relates to a fuel pump (1) which comprises a pump housing (2), a delivery element (3) for delivering fuel, a heat-generating actuator (4) for actuating the delivery element (3), a first fuel path (5) which leads from an inlet (20) to a delivery space (7), and a second fuel path (6) which leads from the inlet (20) past the heat-generating actuator (4) to a first housing opening (21), wherein the first housing opening (21) is arranged above the inlet (20) in the vertical direction (V). The present invention also relates to a fuel pump arrangement which comprises a fuel pump (1) according to the invention and a fuel tank (10) in which the fuel pump (1) is at least partially and preferably entirely arranged. The present invention also relates to a method for operating a fuel pump (1).

A liquid supply system that can be cooled efficiently. The liquid supply system 10 includes a container 130 having an inlet 131b and an outlet 131c for liquid and provided with a pump chamber P1, P2 inside it, an outlet pipe 320 through which liquid discharged from the outlet 131c is brought to outside, a fluid channel through which liquid flows, the fluid channel leading out of the inlet 131b, passing through the pump chamber P1, P2, and extending vertically downward from the pump chamber P1, P2 to the outlet 131c, and a gas vent pipe 602 connecting a first orifice 601 and a second orifice 604, the first orifice 601 being disposed in the fluid channel and the second orifice 604 being disposed in the fluid channel downstream of the first orifice 601. The second orifice 604 is located at vertically higher level than the first orifice 601.