A pump speed detecting device for diverse purposes in connection with various actuating devices disposed upon motor vehicles includes a pump, driven by a variable speed prime mover, for supplying fluid from a reservoir and discharging the same, at a flow rate proportional to the number of revolutions thereof, into a first conduit which is fluidically connected to a fluid motor. A flow control valve is fluidically connected to a first conduit so as to direct fluid from the first conduit into a se...

A vaned hydraulic motor which includes a rotor adapted to rotate in excess of 180.degree. with respect to the stator, has, in an axial juxtaposition, a middle circumference annular chamber and two outer circumferential annular chambers flanking the middle annular chamber. The axial width dimension of each of the outer annular chambers is one half of the axial width dimension of the middle annular chamber. In each annular chamber there are disposed first and second radial partitions forming a sep...

Apparatus of a fluid system of a work vehicle for controlling the fluid delivered to work elements of the vehicle in response to the load exerted on the fluid system by the work elements.

A demand compensated hydraulic system includes a pump responsive to a pressurized fluid in a demand feedback pilot line. The pilot line is connected to sense fluid demand between a hydraulic motor and an associated control valve which is closed by servo feedback from the motor. A dither is connected to the pilot line to continuously oscillate the pressurized fluid in the pilot line to prevent the occurrence of a situation wherein the flow across the control valve is sufficient to prevent the pum...

The invention relates to an assisted hydraulic control, especially for steering all types of vehicles, and comprising a double-acting receiver or hydraulic cylinder, the piston of which forms two chambers in the cylinder, the piston rod extending into one of the chambers only and having no counter-rod extending into the other chamber. The first chamber thus has a smaller effective section than the second chamber, and the resulting asymmetry of operation of the piston and therefore of the steerin...

A load responsive direction and flow control valve for use in fluid power load responsive system. The valve maintains a selected constant flow level for control of both positive and negative loads, irrespective of the change in the load magnitude or change in the fluid pressure, supplied to the valve. When controlling positive or negative loads the valve maintains a constant pressure differential across a flow control metering orifice utilizing a single control slide member, first by throttling ...

A water holding tank is placed at a substantial water depth. Two water valves and an air valve are on the tank. A conduit leads from the tank to the surface atmosphere. A second embodiment of the invention includes a hollow cannister member placed at a substantial water depth and has a filter with walls of material permeable to dissolved air but not liquid water. A conduit leads from the cannister member to the surface atmosphere. There is a regulating valve in the conduit. Gas pressure driven p...

A hydraulic fluid supply system includes a single motor driven pump which supplies a dual pressure level output for providing both a high pressure oil output and a low pressure oil output. In combination with a turbomachine, the dual pressure level output of the oil pump obviates the requirement of pressure reducing valves in the low pressure supply lines and losses associated therewith. Moreover, since only a portion of the entire oil requirement is raised to the higher pressure level, the pump...

A first pump and a second pump have respective mechanical inputs and are operative when the mechanical inputs are driven at constant speed for pumping fluid at an adjustable volumetric flow rate and at a constant non-adjustable volumetric flow rate, respectively, the maximum volumetric flow rate of the first pump being at least as great as that of the second pump. Connecting conduits connect the first pump in hydraulic circuit with an hydraulic consumer. An adjusting mechanism is provided for ad...

A hydraulic system having a plurality of hydraulic motors operated by fluid from a common reservoir includes means for circulating a flow of fluid from the reservoir through the housing of the motors to thereby maintain a substantially equal temperature between the motors and the fluid.