Abstract: The invention relates to a pressure averager for providing an averaged working pressure from the operating pressures of at least two sources of pressure medium, there being provided to average the operating pressures a differential piston of which the number of step faces which face the same direction and which are of equal size corresponds to the number of operating pressures to be averaged, of which the oppositely directed working face is equal to the sum of the step faces, and which is displaceably guided in a correspondingly stepped housing which is provided with supply lines for the operating pressures, and its object is to develop the pressure averager in such a way that an additional pressure relief valve is not required for its function within a hydraulic installation.

Abstract: A square root signal extractor generates an output signal which is a square root function of an input signal. First and second diaphragm amplifiers have cascaded output chambers connected to a high gain output amplifier. The first and second amplifiers are connected as the non-inverting input and the inverting input respectively of the operational amplifier. A high gain output diaphragm amplifier is connected to the inverting amplifier output. The output diaphragm amplifier is constructed such that only a low level input pressure change is required to create a full swing of the output pressure. A non-linear input restrictor and a linear feedback resistor are connected to the input chamber of the inverting amplifiers. The feedback resistor has a significantly greater resistance than the input resistor. The non-inverting diaphragm amplifier is connected to the transmitter by a fluid repeater. A reference signal source is connected to the input restrictor and thus to the inverting input.

Abstract: The present invention relates to a pneumatic flow measuring system for measuring fluid flow. More particularly, the disclosed preferred embodiment of the present invention is referred to as a square root extractor as the device basically functions to compute the square root of a pneumatic input signal by producing an output signal that is linear with flow or fluid velocity of a system being measured. Thus, although flow between two points may be basically defined as a square root function of a differential pressure between the same two points, the flow measuring device of the present invention utilizes a differential pressure input signal to produce an output signal that is linear with flow.

Abstract: A fluidic control system which automatically schedules and controls power developed by an aircraft during landing approach operation. Fluidic signals are generated in relation to sensed aircraft flight parameters, and these signals are combined in a preselected manner which includes integration of one of the signals by a series feedback capacitance fluidic integrator, to produce a single input signal indicative of a desired rate of fuel flow to schedule aircraft power to the desired level. The single input signal is temperature compensated, then discretely selectively modified in relation to ambient conditions by selectively varying the impedance of fluidic resistive networks to alter the gain of a fluidic amplifier driven by the single input signal. An error signal is then generated and amplified to produce a power output signal which drives a fuel control servo actuator in proportion to the error signal when the latter is small, and drives the servo in a digital manner when the error is large.