Abstract: An AND-type control valve useful in a vehicle braking system to prevent application of the vehicle brakes when only the right-hand or left-hand vehicle brakes are applied for the purpose of steering the vehicle. The control valve has two input flowpaths corresponding to the hydraulic braking circuit on different sides of the vehicle and a control output port for connection to the vehicle brake valve. Each input flowpath contains a non-return valve having associated therewith a flow sensitive device to provide a restricted flowpath which gives rise to a pressure drop which will tend to close or assist in closure of the non-return valve. A device is provided to prevent simultaneous closure of both non-return valves.

Abstract: The disclosure relates to an air pressure sensor comprising a first air passage, a branch passage having an opening into the air passage, a sensor in the branch passage responsive to variation in air pressure in the opening and jet means for air flow through the first passage adjacent the opening to the branch passage to create an increased depression in static pressure as compared with the remainder of the air passage to enhance the response of the pressure sensor in the branch passage when air flow through the first passage occurs. The air passage terminates in a probe having an orifice to be opened and closed by the absence of and presence of a surface in contact with the probe so that the pressure sensor indicates whether or not the probe is in contact with the surface.

Abstract: Fluid logic elements are combined in various ways to provide staging, shift register and binary flip-flop functions. The elements used to provide the complex functions include a flip-flop element, sequential AND and sequential NOT elements in various combinations. For example, two sequential AND elements or two sequential NOT elements may be arranged with a single flip-flop element to provide a shift register or a binary flip-flop function. A single sequential AND element or a single sequential NOT element in combination with a single flip-flop element provide a staging function. Combinations of the multiple element devices provide enhanced control functions.

Abstract: A pneumatic program register comprising a plurality of sequential by cascaded modules, each module comprising a pneumatic flip-flop, an AND cell with two inputs and an OR cell with two inputs, one input of said OR cell being connected with the output of said flip-flop of same module, said output of said flip-flop being also connected with one of the inputs of said AND cell of same module, the other input of said OR cell being connected, on the one hand, with the output of the OR cell of the following sequential module, so that the OR cells of all sequential modules are connected in series, and, on the other hand, with the reset port of said flip-flop of the same module, the trigger input of said flip-flop being connected with the output of the AND cell of the preceding sequential module.

Abstract: The invention provides the functional reliability of an automatic device, constituted by the association of phase cells comprising, for each phase, a pneumatic AND gate and bistable memory, which is ensured by the interposition of a threshold relay between the feedback interrupter associated with a phase all and the control input of the memory.

Abstract: The invention provides a control circuit for a pneumatic shift register constituted by phase cells associated with an assembly of two threshold relays, each having a supply input and a control input which inhibits the output when the pressure that it receives is not lower than a pressure threshold which is low with respect to the control threshold of the memory contained in the cell.

Abstract: An instantaneous signal applied to the inlet of the timing device is passed through a restrictor into a capacitance and the resultant rising pressure is compared with an adjustable-level reference pressure signal which defines the timing period. When the capacitance pressure exceeds the reference signal value, a comparison signal initiates the release of an obturator. The reference pressure propagates to the outlet of the device and produces the time-delay signal.

Abstract: The pneumatic logic circuit is of generally symmetrical structure around an axis and symmetrical with respect to a median plane normal to this axis. It has a median plate provided with an axial passage and with a duct opening into this passage. On each side of the median plane is a diaphragm constituted by a flat sheet of rubber or of synthetic elastomer with, on its outer surface, a centering shoulder and with an axial cylindrical passage. It comprises axially a piston rod, passing freely through said passage of the median plate and with fluid-tightness through said passages of the diaphragm and bearing two pistons.

Abstract: Pneumatic logic system.The logic chain is established by juxtaposition of logic modules each of them being provided with a selecting organ having at least two positions allowing to modify the circuit diagram.Advantageous system for the sequential control of machines by pneumatic way.

Abstract: Each wire of a wire printer is driven by a separate pneumatic motor. Each motor is actuated by compressed air which is selectively passed through an electrically operated valve for each motor. Each valve is actuated by an electric signal indicating whether the associated printing wire should be driven to print a desired character. Coupled between a compressed air source and all of the individual valves is an electrically operated pressure control valve which is normally closed to block transmission of compressed air from the source to the individual valves. After the individual valves are opened by electric signals to permit the printing of a desired character, the control valve is then opened to permit transmission of the compressed air through the opened individual valves to actuate the individual pneumatic motors to drive the print wires necessary to print the desired character.

Abstract: An electro-fluid interface device utilizes a control member that oscillates within a generally cylindrical chamber between an opposed pair of nozzles located at the ends of the chamber. Each nozzle is in fluid communication with a fluid supply, a fluid outlet, and a fluid drain. A coil or coils energized in response to an electrical input signal pulse width modulate the oscillation of the control member to produce a fluid flow through the outlets that is proportional to the electrical signal. In a preferred form, a pair of the coils is energized to oscillate the control element electromagnetically in cooperation with fluid flow forces on the control member due to the flow through the nozzles. Means for sensing the position of the control element switch the energizing current between the coils.

Abstract: A fluidic device comprising a housing having operate and release compartments separated by a passage is arranged with a pressure source for forcing a deformable moving element from either compartment into a deformation chamber connecting to the release compartment. The moving element is deformed to increase its potential energy by an amount which is sufficient to effect the element's movement from the deformation chamber to the operate compartment upon termination of the pressure.