A fuel cell stack comprising one or more high temperature membrane electrode assemblies (MEAs) and a bipolar plate comprising a liquid cooling chamber and gas flow channels; the use thereof, and the preparation thereof. The invention also encompasses an electrical generating system.

A novel electrochemical hydrogen compressor material technology system comprising a composite polymer membrane made from a blend of inorganic and organic polymers, the preparation and the use thereof.

A compressor and a method for conveying and compressing a fluid into a target system. The compressor has a first drive part having a first drive piston, a second drive part having a second drive piston and at least a first high-pressure part having a high-pressure piston. The first drive piston and the second drive piston are each able to be subjected to a drive fluid piston on alternate sides controlled via a first control unit. The first drive, the second drive piston and the high-pressure piston are jointly movable axially coupled via a piston rod arrangement. The second drive part is assigned a second control unit, which is arranged after the first control unit and via which the subjecting of the second drive piston to drive fluid is able to be activated.

A compressor and a method for conveying and compressing a fluid into a target system. The compressor has a first drive part having a first drive piston, a second drive part having a second drive piston and at least a first high-pressure part having a high-pressure piston. The first drive piston and the second drive piston are each able to be subjected to a drive fluid piston on alternate sides controlled via a first control unit. The first drive, the second drive piston and the high-pressure piston are jointly movable axially coupled via a piston rod arrangement. The second drive part is assigned a second control unit, which is arranged after the first control unit and via which the subjecting of the second drive piston to drive fluid is able to be activated.

A flangeless fluid end comprising a fluid end body releasably attached to a connect plate. The connect plate is attached to a power source using stay rods. The flow bores of the fluid end are sealed without threading a retainer nut into the walls of each bore. Instead, the flow bores are sealed by bolting a retainer to the fluid end body. Plungers to drive fluid through the fluid end body are installed within removable stuffing box sleeves. These sleeves are maintained within the plunger bores by the bolted retainers. A number of features, including the location of seals within bore walls and carbide inserts within valve structures, aid in reducing or transferring wear.

A flangeless fluid end comprising a fluid end body releasably attached to a connect plate. The connect plate is attached to a power source using stay rods. The flow bores of the fluid end are sealed without threading a retainer nut into the walls of each bore. Instead, the flow bores are sealed by bolting a retainer to the fluid end body. Plungers to drive fluid through the fluid end body are installed within removable stuffing box sleeves. These sleeves are maintained within the plunger bores by the bolted retainers. A number of features, including the location of seals within bore walls and carbide inserts within valve structures, aid in reducing or transferring wear.

Pulse tube coolers and Gifford-McMahon coolers are used to cool nuclear spin tomographs and cryopumps. To supply cooled working gas, gas compressors and in particular helium compressors are used with rotational or rotary valves. The rate at which compressed helium is introduced into the cooling device and let out again lies in the range of 1 Hz. A problem of conventional screw or piston processors is that oil from the compressor mixes with the working gas and thus contaminates the cooling device. By providing a second compressor stage, a common pump device can be used to pump in both directions, which results in a two-stage compressor device. The working gas is compressed in each flow direction of the working liquid, in one flow direction in the first compressor stage and in the opposite flow direction in the second compressor stage. Thus, the efficiency of the compressor device is improved.

Pulse tube coolers and Gifford-McMahon coolers are used to cool nuclear spin tomographs and cryopumps. To supply cooled working gas, gas compressors and in particular helium compressors are used with rotational or rotary valves. The rate at which compressed helium is introduced into the cooling device and let out again lies in the range of 1 Hz. A problem of conventional screw or piston processors is that oil from the compressor mixes with the working gas and thus contaminates the cooling device. By providing a second compressor stage, a common pump device can be used to pump in both directions, which results in a two-stage compressor device. The working gas is compressed in each flow direction of the working liquid, in one flow direction in the first compressor stage and in the opposite flow direction in the second compressor stage. Thus, the efficiency of the compressor device is improved.

A cam driven compressor includes a cam coupled to a plurality of cylinder and piston assemblies. Each cylinder and piston assembly comprises a piston located and movable within a respective cylinder. Each cylinder has a cylinder head. The compressor comprises a housing defining a cavity configured to receive a portion of a source gas from one or more of the cylinders in order to maintain a positive gas pressure within the cavity.

A cam driven compressor includes a cam coupled to a plurality of cylinder and piston assemblies. Each cylinder and piston assembly comprises a piston located and movable within a respective cylinder. Each cylinder has a cylinder head. The compressor comprises a housing defining a cavity configured to receive a portion of a source gas from one or more of the cylinders in order to maintain a positive gas pressure within the cavity.