Abstract: An electrohydraulic system for rapidly reducing the steam flow through the high pressure and lower pressure stages of a turbine power plant in response to a partial loss of electrical load, is disclosed. In response to the detection of a partial loss of load, the system provides for controlling a portion of the governor valves and all of the interceptor valves to close rapidly and independently of the turbine control system; also to operate the turbine control system to cause the remaining governor valves to operate to a predetermined partially closed condition independent of the normal governor valve reference demand signal by applying a signal for changing the open limit position of the governor valves; and to eliminate the affect of the impulse pressure loop from the turbine control system. The upper valve position limit signal and the slower rate of change reference demand signal is matched to the applied signal.

Abstract: A threaded mechanical joint wall sleeve comprising a cylindrical member having opposite ends with inside and outside surfaces. The cylindrical member is adapted to be centrally positioned relative to a wall member and has an annular collar extending outwardly therefrom which is imbedded in the wall member. A pair of flanged end members or adapters are threadably secured to the outside or inside surfaces of the opposite ends of the cylindrical member and are adapted for attachment to the opposite sides of the wall member. A wide variety of wall thicknesses and pipe diameters may be accommodated due to the fact that the length of the cylindrical member may be varied and due to the fact that the adapters may be either threadably secured to the external threads or the internal threads provided on the opposite ends of the cylindrical member.