Abstract: 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.

Abstract: The invention relates to a manual hydraulic operating vise, said vise comprising a stationary jaw with a cylindrical center assembly formed in the body of the stationary jaw. A movable jaw being firmly connected to a main piston in the center assembly by a movable rod. A handwheel used to operate a control valve to seat or unseat on a boost piston in an inner liner inside of the center assembly. Several internal oil passages are provided therein for free oil flow around the main piston when the control valve is unseated, so that the movable jaw can be positioned manually with least resistance, thus greatly reduce the time for positioning. When the control valve is seated further turning handwheel will operate the movable jaw backward hydraulically to clamp the workpiece with a greater force which is the multiplication of force input on the handwheel because hydraulic and mechanical advantage of the structure.