A method of making a three-flow-passage valve with a pressure indicator, comprising the steps of constructing a first half housing defining an upper flow passage, a middle flow passage, and a lower flow passage; constructing a second half housing defining the same flow passages; forming an access port through the housing in the middle flow passage; forming a first valve seat with one valve opening; assembling one movable valve opening stopper in the upper flow passage; adjusting the one movable valve opening stopper; forming a second valve seat with one valve opening; assembling one movable valve opening stopper in the upper flow passage; adjusting the one movable valve opening stopper to allow the one movable valve opening stopper in the middle flow passage; combining and sealing the first half housing with the second half housing; and mounting a pressure indicator to the access port.

A hydro turbine of a hydroelectric power plant operates with reduced cavitation at low power levels. A using at least one motion sensor coupled to a rotor of the hydro turbine, during operation of the hydro turbine is used to generate at least one metric indicative of an effect of cavitation on the hydro turbine. The metric is used by an automated governing system to change the operation of the hydro turbine to reduce cavitation.

A water transportation pipe power generation device with flow-regulating and pressure-regulating function is provided comprising a tubular power generator housing, a stator component fixedly inside and a tubular rotor component coaxially disposed inside the stator component. The stator component comprises fixed coil windings uniformly distributed on an outer circumferential surface of the rotor component and an adjustable coil winding capable of performing axial movement along the rotor component and adjusting an axial position to change a magnetic flux. The rotor component comprises a tubular rotor housing for a water flow to run through. Multiple spirally-distributed rotor blades are disposed on an inner circumferential surface of the rotor housing, and permanent magnet groups in sensing cooperation with the fixed coil windings and the adjustable coil winding are disposed on an outer circumferential surface of the rotor housing. The rotor component can coaxially rotate for power generation relative to the stator component.

A device for generating electricity in an irrigation system includes a water turbine, a generator, and a bypass valve. The water turbine converts the flow of water in the irrigation system into rotational energy. The generator is connected to the water turbine for converting the rotational energy into electrical energy. The bypass valve assembly is in fluid communication with the water turbine and the irrigation system and is configured to regulate the flow of water through the water turbine and to direct excess water around the water turbine and back into the irrigation system. The device is configured to generate electricity while maintaining a predetermined flow rate in the irrigation system and to direct excess water around the water turbine and back into the irrigation system when the flow of water through the water turbine exceeds the predetermined flow rate.

An underwater flow turbine includes a gondola having an interior, a generator in the gondola interior, a rotatable hub connected to the gondola and configured to support a plurality of rotor blades, the rotatable hub being operatively connected to the generator, and an air handling device, such as a fan or an air filtration system, in the gondola and/or in the hub.

The present invention relates to a hydraulic installation where sediment concentration in the water flow circulating through the cited installation is monitored continuously. According to the invention, the hydraulic installation comprises a pressure-reducing device and a primary sensor: the pressure reducing device decreases the pressure and discharge of upstream water flow, comprising sediments, allowing that the primary sensor can operate continuously measuring sediment concentration from the upstream water flow. The hydraulic installation also comprises a calibrating device, providing the primary sensor with a reference value to be used for comparison matters and for establishing the content of sediment in the water flow.

Methods and apparatus to test a generator of a hydrokinetic turbine are disclosed herein. An example method includes positioning a rim generator of a hydrokinetic turbine assembly on a testing apparatus prior to assembling the rim generator with the hydrokinetic turbine; orienting a rotational axis of the rim generator substantially vertically; and measuring a first output performance of the rim generator.

A method and system for monitoring operation of a hydraulic turbine under an extremely low water head, belonging to the technical field of hydraulic turbines. The method includes: acquiring static operating parameters of a target hydraulic turbine; determining an operating limit water level of the target hydraulic turbine based on the static operating parameters; determining dynamic operating parameters of the target hydraulic turbine, and simulating operating conditions of the hydraulic turbine based on the static operating parameters and the dynamic operating parameters; dividing operating condition regions of the hydraulic turbine based on the simulated operating conditions of the hydraulic turbine to obtain an operating condition division result; determining monitored operating condition regions of the target hydraulic turbine based on the operating limit water level and the operating condition division result; and monitoring real-time operating conditions of the target hydraulic turbine based on the monitored operating condition regions. The method and system solve the problem that the operating state of hydraulic turbines under an extremely low water head cannot be accurately monitored.

A turbine assembly includes a shaft having an axis, a single cam with a cam profile and coupled to the shaft, and at least one foil coupled to the cam and having an axis. A variable pitch mechanism is coupled to at least one of the at least one foil or the single cam and is configured to adjust a position of the at least one foil while the at least one foil simultaneously rotates about the shaft. At least one of the shaft, the variable pitch mechanism, and the at least one foil is configured to be automatically actuated in a direction parallel to the axis of the shaft.

A hydro turbine of a hydroelectric power plant operates with reduced cavitation. At least one motion sensor coupled to a rotor of the hydro turbine measures motion of the rotor during operation of the hydro turbine and generates measurement data. The measurement data and one or more operational parameters of the hydro turbine employed during the measuring are acquired. The operational parameter(s) is/are indicative of power supply of the hydro turbine. Based on the measurement data and the operational parameters, at least one metric indicative of an effect of the cavitation on the hydro turbine is computed. The at least one metric is compared with at least one threshold. Based on the comparison, a determination is made that the effect of the cavitation is too high. Based on the determining, information indicating unsuitability of the one or more operational parameters is output.