Abstract: A function generator is provided which establishes an output signal according to a functional relationship determined by the preformed contour of an easily precut cam member. The function generator includes a variable gain controller section coupled to a proximity sensing motion balance servomechanism which varies the gain of the controller according to the sensed proximity of the servomechanism to the edge of the cam member without physical contact therewith. The cam member's position is in turn determined by an input signal which may be related to the controller input signals or may be an independent signal from a remote source. The gain and consequently the output of the controller is varied according to the functional relationship determined by the precut contour of the cam member.

Abstract: A pneumatic amplifier is disclosed having a body, the body with two opposed heads, a sensor head, and a valve head. An air direction chamber is defined interiorly of the two heads and body, and is separated from the sensing chamber by means of a sealed piston. The piston is actuated at one side by means of back pressure on a jet orifice which is connected to a sensor supply, and the back pressure is translated into a movement of the flexible piston. In the valve chamber, a dart valve is actuated on one end by the piston, and its cone at the other end seats in a valve seat in pneumatic connection with the valve head. The valve head has a signal supply which, when not by-passed through the dart and its associated valve, passes out through a signal tube to actuate a signal device, whether ultimately pneumatic, electric, hydraulic, or other source of power. Optionally a diaphragm type piston is employed.

Abstract: A high stability pneumatic pressure regulator is provided by the use of a movable vane and nozzle assembly to operate a valve plug and thereby change the regulator output pressure. Movement of the vane and nozzle assembly is initiated by an adjustable input member which changes the vane to nozzle spacing and subsequently causes the vane and nozzle assembly to move with the valve plug until the normal vane to nozzle spacing is restored. A feedback of the output pressure is used to balance the adjustable input member.

Abstract: A pneumatic apparatus or relay which, in one embodiment, maintains the output pressure at a fixed level until the signal pressure obtains a predetermined value at which time the output pressure varies according to the signal pressure and, in a second embodiment, maintains the output pressure at a first level, which may be essentially zero, until the signal pressure obtains a predetermined value at which time the output pressure assumes a second level until the signal pressure reaches a second predetermined value and then the output pressure varies according to the signal pressure.

Abstract: In a force balance transmitter having a base structure provided with passages therein and a secondary assembly attached thereto that includes a pneumatically operated relay module detachably secured to the secondary assembly and having passages therein, the improvement of a fluid transfer member being disposed between the module and the base structure while interconnecting the passages of the base structure respectively to the passages of the module, the fluid transfer member being carried by the secondary assembly and having means floatingly interconnecting with the passages of the base structure to tend to isolate motion of at least that part of the base structure from the module.