| 摘要 |
This invention relates to engine speed governor and is fully hydraulically actuated in proportion to sudden load changes of a steam turbo-generator engine. The invention comprises a transmitter and a receiver inter-connected by tubings. Oil pressure from the engine lubricating system through a pressure reducing valve is used as an operating power for the transmitter and the receiver for operating engine main control valve. The transmitter comprises a control valve having two axially spaced apart pistons and internal oil passages, a fixed spring and an adjustable concentrical spring acting on the top piston of the control valve, a variable spring acting on the bottom piston of the control valve and is seated on a stem which is connected to engine speed measuring device such as fly-weight by a push rod and a center rod. The receiver comprises a power piston having a control rod connected to the engine main control valve; a pilot valve, having four axially spaced apart pistons and internal oil passages, which is movable mounted inside the working piston and a spring in between, a spring acting on the top of the power piston, an adjustable conical spring acting on the top of the pilot valve. Said transmitter and receiver are automatically balanced in their neutral positions by the said springs and oil pressure when the engine speed corresponds with the load changes, therefore no mechanical linkage for transmission of feed back motion is needed.
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