Devices, systems, and methods for compressing a gas are disclosed. A low-pressure gas is drawn into a vessel through a source gas inlet. The source gas inlet and a liquid gas outlet are sealed. A liquid is pumped into the vessel through a liquid inlet such that the low-pressure gas is compressed to produce a high-pressure gas. The liquid inlet is sealed. A destination gas outlet is opened and the high-pressure gas is passed out of the vessel. The destination gas outlet is sealed. The source gas inlet is opened. A liquid outlet is opened and the liquid is removed out of the vessel such that the low-pressure gas is drawn into the vessel as the liquid is removed from the vessel.

A pressure multiplier having a cylinder assembly, a command device, and an electronic control unit is provided. The electronic control unit is configured to obtain a switching signal to be provided to the command device from a compression curve which, knowing pressure of a fluid entering the pressure multiplier, binds a pressure increase of the fluid exiting the pressure multiplier with a switching frequency of a piston of the cylinder assembly.

A gas compressor system includes a compression liquid holding tank in fluid communication with a combustion tank. A combustible fluid is directed to the combustion tank. An ignition system is provided for igniting the combustible fluid. A compression liquid flows between the liquid holding tank, the combustion tank, and a compression tank. A compressible gas is provided in the compression tank. The ignition of the combustible fluid drives the compression liquid from the combustion tank to the compression tank, compressing the compressible liquid. An HVAC&R system and a method of compressing gas are also disclosed.

The invention provides an apparatus for compressing a first fluid. The apparatus comprises a compressor piston comprising a piston cylinder and a piston assembly slidably mounted therein. The piston assembly comprises first and second spaced apart piston members defining a space therebetween. The space is configured to contain a second fluid used to cause compression of the first fluid. The piston assembly further comprises means for feeding second fluid to the space between the first and second piston members.

Methods and systems are provided to adaptively control a hydraulic fluid supply to supply a driving fluid for applying a driving force on a piston in a gas compressor, the driving force being cyclically reversed between a first direction and a second direction to cause the piston to reciprocate in strokes. During a first stroke of the piston, a speed of the piston, a temperature of the driving fluid, and a load pressure applied to the piston is monitored. Reversal of the driving force after the first stroke is controlled based on the speed, load pressure, and temperature.

A fluid transfer system, including a first stage, including an inlet, a surge tank, and a first cylinder operatively arranged to pump the fluid from the inlet to the surge tank, and a second stage, including an outlet, a knock out tank, and a second cylinder operatively arranged to pump the fluid from the surge tank into the knockout tank.

A vacuum assembly includes a housing, a movable assembly positioned within the housing, and a biasing mechanism coupling the movable assembly to the housing. The movable assembly is movable between a first position and a second position within the housing to create a low pressure area between the housing and a first portion of the movable assembly.

Methods and systems are provided for conducting a diagnostic routine of the fuel vapor system using pressure generated by raising or lowering a vehicle body element such as a hood or a trunk. In one example, by utilizing lift gate cylinders coupled to the hood or trunk, during raising a hood or trunk, the fuel vapor system may be evacuated and during lowering the hood or trunk, the fuel vapor system may be pressurized. A change in vacuum or higher pressure in the fuel vapor system may be monitored over a time period to detect any undesirable evaporative emissions from the fuel vapor system.

A hydraulically operated compressor has a fixed piston and a fixed compression or outer cylinder. A drive or intermediate cylinder is located between the piston and outer cylinder. A compression chamber is formed between the drive cylinder and the outer cylinder. Drive fluid is pumped into and released from an interior chamber in the drive cylinder to reciprocate the drive cylinder. The drive fluid also provides cooling to the interior of the compressor.

A gas compression system is provided. The gas compression system includes a compressor, an adsorption device, and a fluid control device. The compressor includes a first port and a second port. The adsorption device is adapted to output the high pressure hydrogen gas to the first port and absorb the low pressure hydrogen gas from the second port. The adsportion includes a first container connected to the first port or the second port, and a second container connected to the first port or the second port. The first container and the second container includes a hydrogen adsorption material adapted to release the high pressure hydrogen gas when heated, and absorb the low pressure hydrogen gas when cooled. A method of using the gas compression system is also provided.