Abstract: Staying of a drain on a cylinder attached to a lower side of a valve casing is suppressed, and occurrence of corrosion of the cylinder is suppressed. A steam valve includes a valve casing, a valve disc disposed within the valve casing, a cylinder disposed on a lower side of the valve casing and having a piston rod extending upward, a valve stem vertically penetrating a lower portion of the valve casing and having one end coupled to the piston rod via a coupling and having another end coupled to the valve disc, a cover having a larger diameter than the piston rod and the coupling and configured to separate the piston rod and the coupling from each other by being interposed between the piston rod and the coupling, and a tubular skirt hanging down from a peripheral portion of the cover and surrounding a periphery of a head portion of the piston rod.

Abstract: The present invention relates to a method of controlling a compressor and an apparatus therefor, the method, comprising at least the steps of: (a) providing a compressor feed stream (10); (b) passing the compressor feed stream (10) to an inlet (48) of the compressor (50) to provide a compressed stream (60) at an outlet (52) of the compressor (50); (c) calculating one or more controlled variables (CO1, CO2) that are invariant to compressor inlet conditions of the compressor feed stream (10), said inlet conditions comprising at least the ratio of specific heats (Cp/Cv) of the compressor feed stream (10), said one or more controlled variables comprising a surge controlled variable (CO1) representing the surge characteristics of the compressor (50); (d) providing one or more set points (SP1, SP2), that are invariant to the compressor inlet conditions of the compressor feed stream (10), said inlet conditions comprising at least the ratio of specific heats (Cp/Cv) of the compressor feed stream (10), said one or mor

Abstract: It is presented a method for controlling the instantaneous power output from a wind power plant. Wind speed and wind directions are determined, wherein an upper limit power output for the specific wind speed and wind direction is determined from a previously measured power output value at the same wind speed and wind direction, and wherein the power output of the wind power plant is controlled based on the determined upper limit power output. A wind power plant is also presented.

Abstract: A steam turbine system including a steam turbine is provided. The steam turbine system includes a high-pressure side steam inlet device, a low-pressure side steam device, and a control device for controlling the steam turbine. An additional steam inlet device is also included arranged between the high-pressure side steam inlet device and the low-pressure side steam device. The control device control a supply of steam via the additional steam inlet device as a function of operating parameters detected at the steam turbine system.

Abstract: A speed controller generates a speed control output signal based on an output target value and a detected speed of a steam turbine, an extraction pressure controller generates an extraction pressure control output signal based on an extraction flow rate target value and a detected extraction pressure of the steam turbine, and when operation signals of a governor valve and an extraction control valve are generated with reference to an extraction map for deriving opening degrees of the valves at an operation point determined depending on the signals, the extraction map is used with a scale of the extraction pressure control output signal in the extraction map being corrected to be multiplied by “extraction flow rate target value/extraction flow rate actual value” based on a regularly detected extraction flow rate actual value of the steam turbine.

Abstract: The present invention includes an inflow quantity regulating means 5 for regulating the inflow quantity of a fuel gas to a compressor 1; a recycle valve 7 for returning the fuel gas discharged from the compressor 1 to the inlet side of the compressor 1; and a control means which sets a control operating value for operating the compressor 1 at a predetermined operation point, and controls the inflow quantity regulating means 5 and the recycle valve 7 based on the control operating value. The control means has a first control signal generating means 27 which generates a signal increasing with an increase in the operating value as a control signal for the inflow quantity regulating means 5 when the control operating value is a predetermined value or larger and a second control signal generating means 29 which generates a signal decreasing with an increase in the operating value as a control signal for the recycle valve 7 when the control operating value is smaller than the predetermined value.

Abstract: The method enables a turbine to be used at varying speeds and powers. An injector (15) is placed in a channel (3) downstream from a turbine (4); it creates a Venturi effect and converts pressure control into control of the mass flow rate of a mixed fluid. Sensors (18) and a regulator (17) enable the speed of the turbine (4) to be matched to a reference speed. A variant consists in placing a suction generator at the outlet of the section (5) of the channel (3).

Abstract: A turbine device and a method of driving the turbine device are disclosed. The turbine device includes an admission channel, a turbine, and an injection channel. The turbine device may also include a regulator. The turbine is driven by injecting a primary fluid into the admission channel at a given velocity and simultaneously causing a secondary fluid to flow into the admission channel at a lower velocity. The primary fluid and the secondary fluid form a mixture in the admission channel, which flows toward the turbine. The velocity of the mixture is less than that of the primary fluid, while the mass flow of the mixture is approximately equal to the sum of the mass flows of the primary and secondary fluids. The regulator compares the rotational speed of the turbine to a target speed and regulates parameters associated with the turbine device if the rotational speed of the turbine and the target speed differ by more than a predetermined amount.

Abstract: A speed governor for a pneumatic power tool which comprises a housing (10) with pressure air supply means (16-18) and an air turbine (20) including a turbine wheel (22) drivingly coupled to an output spindle and a number of air nozzles (25) for directing motive pressure air onto the turbine wheel (22), wherein the speed governor comprises a flow controlling valve element (43) associated with an activation piston (44) for adjusting the valve element (43) in response to a control pressure obtained in a pressure sensing opening (34) located opposite an idle running nozzle (28) downstream of the turbine wheel (22).

Abstract: The present invention relates to an full-arc admission steam turbine having its output controlled by regulating the opening of a steam regulating valve. The full-arc admission steam turbine is run at a higher efficiency than that of the full-arc admission steam turbine of the prior art by improving the drop in the internal efficiency of the turbine due to the throttle loss of the valve. Moreover, a substantially constant high efficiency is maintained for the time period from the designed point of a partial load to the rated load if the second blade stage group is selected to provide an internal efficiency substantially equal to that of the blade stage group of the prior art.

Abstract: A compressor surge control system is provided for a compressor system in which recirculation of gas from the discharge outlet of the compressor to the suction inlet of the compressor is utilized to prevent surging of the compressor. The recirculation of gas from the discharge outlet of the compressor to the suction inlet of the compressor is substantially minimized by using a first controller to provide a floating set point for a second controller. This reduced recirculation substantially increases the efficiency of the compressor system.