Abstract: The invention relates to a method for the automatic generation of a control process program on a computer. One illustrative embodiment, referred to as STAR-GEN, is described as it might be implemented on a general purpose computer using a suitable high-level language such as Fortran. Through a graphical user interface, STAR-GEN prompts the user for (1) system specific information, (2) problem-specific information, and (3) control process-specific information. When all of these data have been entered, STAR-GEN automatically generates a process control (source) program which is independent of a target computer platform. This source program can be transferred to a specific process control computer where it is compiled for execution using a standard, for example Fortran, compiler. A unique and beneficial aspect of the invention includes its ability to provide the user with a consistent development environment regardless of the specific hardware platform (computer) the process control program is to execute on.

Abstract: A pneumatic servo comprises a motor having a shaft for rotation in response to an electrical signal. A cam is connected to the shaft for rotation therewith. The cam has an outer profiled periphery and opposite sides. A pneumatic nozzle having an opening for directing a flow of gas toward one side of the cam near the periphery, obscures the flow by different amounts as the cam rotates to create a back pressure in the nozzle comprising a pneumatic signal. A curved projection engages an opposite side of the cam, the projection being aligned with the nozzle opening and reducing oscillation excursions of the servo at gas pressures in the nozzle of above 12 psi.

Abstract: A valve operator (10) which includes a ball screw (28) in constant engagement with the output shaft (24) of an air cylinder for automatic operation of the valve, and which includes a manual drive means (20) engageable with the ball screw (28) in any position thereof. The manual drive means (20) includes a ball nut (30) engaged with the ball screw (28), a clutch output member (34) attached to the ball nut (30), a clutch input member (38) which is rotatable by a handwheel (56) through a worm gear train (49, 52), and a manually actuatable clutch actuating assembly (42) which is operable to engage the clutch input member (38) with the clutch output member (34).

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.