Abstract: Inverter for converting a DC voltage to an AC voltage, comprising an inverter controller which is connected to a programming interface of the inverter via which inverter software components can be downloaded.

Abstract: The present invention relates to a snow-and ice dissolving composition comprising an aqueous solution of urea and ammonium-nitrate. The aqueous solution has a mass ratio of (4.5-5.5):(3.6-4.4):(6.3-7.7). In addition, 1.5-2.0 mass per cent of benzoic-acid and/or 0.10-0.25 mass per cent of benzo-or tolyl triazol as corrosion inhibitors can be added.

Abstract: A frost resistant glycol-free coolant composition or process for cooling apparatus is used for cooling, with such composition, which comprises an aqueous solution of a water soluble alkali metal salt, or a mixture of two alkali metal salts. Particularly suitable alkali metal salts are alkali metal acetate and alkali metal formate. Depending on the nature of the particular alkali metal salt or salts, and the extent of frostproofness that is required, the compositon can further contain urea and/or a glycol antifreeze, such as ethylene glycol. Optionally a corrosion inhibitor can also be used.

Abstract: This invention relates to a flapper check valve having a valve housing which has at least one outlet opening. A valve backer plate having a plurality of arcuate backer through holes is positioned generally parallel to a valve port plate having a plurality of arcuate port through holes. The valve port plate and valve backer plate are sealably secured with respect to the valve housing. In an open position of the flapper check valve, the backer through holes are in communication with the port through holes. At least one peripheral spacer/hermetic seal is positioned at a generally peripheral location relative to the valve port plate. Upon combustion within the combustion chamber, the flapper check valve prevents fluid/gas backflow in a direction from the valve backer plate to the valve port plate. At least one flat central spacer is positioned at a generally central location relative to the valve port plate and the valve backer plate.

Abstract: A process for pulse combustion in a horizontal pulse combustor having at least one air inlet flapper valve, at least one fuel inlet flapper valve, a combustion chamber, and a plurality of downstream combustion chamber branches in which each is in communication with a plurality of downstream exhaust tubes. The process includes the steps of introducing air through the air inlet flapper valve into a mixing zone. Fuel is introduced through the fuel inlet flapper valve into the mixing zone. A combustible fuel/air mixture is formed within the mixing and ignition chamber and is ignited there to complete combustion within the combustion chamber. Combustion product gases are exhausted through the combustion chamber branches and further exhausted through the exhaust tubes.

Abstract: A pulse combustor having a combined mixing and ignition chamber in communication with a fuel inlet tube and an air inlet tube. The fuel inlet tube and air inlet tube inject fuel and air, respectively, forming a fuel/air mixture in the mixing and ignition chamber. An ignition source for igniting the fuel/air mixture is located within the mixing and ignition chamber. A main combusiton chamber is sealably secured to the main combustion chamber wall and in comunication with the mixing and ignition chamber. The main combustion chamber first splits into a plurality of downstream combustion chamber branches, each of which further split into a plurality of exhaust tubes. The combustion chamber branches of the main combustion chamber have a slot between the combustion chamber branches. At least one reinforcing strut is secured between the combustion chamber branches within the slot between the combustion chamber branches of the main combustion chamber.

Abstract: A flapper control valve having a valve housing and at least one valve port plate sealably secured to the valve housing. Each valve port plate has at least one valve port plate through hole. At least one back plate is mounted downstream from the valve port plate and in an open position at a distance from the valve port plate. Each back plate has at least one back plate through hole. In the open position, at least one valve port plate through hole is in communication with at least one back plate through hole. The distance between the back plate and the valve port plate in the open position can be closed thus sealing the communication between at least one valve port plate through hole and at least one back plate through hole.

Abstract: The invention relates to an apparatus for making up feed water for a power station having a steam circuit with a steam turbine /3/ and a feed water circuit with a turbine condenser /5/. The apparatus comprises aregulated multi-stage adiabatic evaporator/5/ produces distillate from raw water for making up the feed water. The heating inlet /8/ of the evaporator /15/ is connected to the stream circuit through an ejector /14/. The distillate outlet /36/ of the evaporator /15/ providing distillated water, is connected to the feed water circuit at the turbine condenser /5/ or after it through water delivering means /19, 20/.

Abstract: The invention relates to a heat transfer liquid which comprises 2 to 12 parts by weight of water, at most 4 parts by weight of urea and/or formamide and/or dimethyl formamide, at most 7 parts by weight of ammonium nitrate and optionally ethylene glycol at most of the same volume than that of the above-listed components as major components with at most 0.3% by weight or by volume of corrosion inhibitors calculated for the total weight or volume of the liquid.Using the heat transfer liquid of the invention the drawbacks derived from the application of glycol can be completely or in most part eliminated and a non-toxic heat-transfer liquid suitable for isopiestic drying can be also prepared.