Abstract: In a system for dispensing a cryogenic fluid, a bulk tank is configured to contain a supply of a cryogenic liquid. A sump is configured to receive cryogenic liquid from the bulk tank. A first positive-displacement pump is positioned within the sump and is configured to be submerged within and pump cryogenic liquid stored within the sump. A second positive-displacement pump is positioned within the sump and is configured to be submerged within and pump cryogenic liquid stored within the sump. A vaporizing heat exchanger is configured to receive and vaporize cryogenic liquid pumped from the first pump and/or the second pump.

Abstract: A pump piston is disclosed. The pump piston may include a body having an actuating end, a pressurizing end opposite the actuating end, and an outer diameter that is greater at the pressurizing end than at the actuating end, wherein the outer diameter varies between the pressurizing end and the actuating end without increasing to form an outer diameter profile.

Abstract: A pump system includes a pump and a storage volume in fluid communication with a discharge port of the pump. The pump includes a housing defining a pump bore and a pump piston disposed in sliding engagement with the pump bore, the pump piston being in selective fluid communication with the discharge port of the pump. A method for operating the pump system includes determining a time to drain an amount of a first fluid from the storage volume, and retracting the pump piston within the pump bore at a target retraction rate based at least partly on the time to drain the first fluid from the storage volume.

Abstract: A pump is disclosed. The pump may include at least one pumping mechanism. The at least one pumping mechanism may include a barrel formed of a substrate having a bore and a plunger formed of a substrate and slidably disposed within the bore in the barrel. The pump may further include a coating disposed on the plunger. The coating may include a main layer containing a tribological material and a sacrificial break-in layer disposed on the main layer, the break-in layer containing a tribological material.

Abstract: A pump for cryogenic liquids including plurality of temperature managed pumping mechanisms. Each pumping mechanism including a barrel having a first end and a second end, and at least one bore extending through the barrel from the first end to the second end. The pump barrel including a stabilizer positioned on the first end and at least partially defining a space in fluid communication with the at least one bore to provide cooling to the barrel.

Abstract: System and methods for controlling a flow of fluid in a fuel system are disclosed. In an aspect, a gas admission system includes a gas admission valve assembly having an inlet, an outlet, and a valve configured to control a flow of fluid between the inlet and the outlet and a flow limiter assembly in fluid communication with the inlet of the gas admission valve assembly.

Abstract: System and methods for controlling a flow of fluid in a fuel system are disclosed. In an aspect, a gas admission system includes a gas admission valve assembly having an inlet, an outlet, and a valve configured to control a flow of fluid between the inlet and the outlet and a flow limiter assembly in fluid communication with the inlet of the gas admission valve assembly.

Abstract: A pump piston is disclosed. The pump piston may include a body having an actuating end, a pressurizing end opposite the actuating end, and an outer diameter that is greater at the pressurizing end than at the actuating end, wherein the outer diameter varies between the pressurizing end and the actuating end without increasing to form an outer diameter profile.

Abstract: A pump is disclosed. The pump may include at least one pumping mechanism. The at least one pumping mechanism may include a barrel formed of a substrate having a bore and a plunger formed of a substrate and slidably disposed within the bore in the barrel. The pump may further include a coating disposed on the plunger. The coating may include a main layer containing a tribological material and a sacrificial break-in layer disposed on the main layer, the break-in layer containing a tribological material.

Abstract: A pump barrel is disclosed including an elongated body having a first end and a second end. At least one bore may extend through the elongated bore body from the first end to the second end. The pump barrel may also include a stability feature positioned on the first end and at least partially defining an axial space in fluid communication with the at least one bore.

Abstract: A pump system includes a pump and a storage volume in fluid communication with a discharge port of the pump. The pump includes a housing defining a pump bore and a pump piston disposed in sliding engagement with the pump bore, the pump piston being in selective fluid communication with the discharge port of the pump. A method for operating the pump system includes determining a time to drain an amount of a first fluid from the storage volume, and retracting the pump piston within the pump bore at a target retraction rate based at least partly on the time to drain the first fluid from the storage volume.