Abstract: A multiple orifice flow measuring device includes a housing having a central passage and a shaft passage located above and parallel to the central passage. The central passage contains a pipe adapted to be connected to a gas flow line. Mounted in the shaft passage is a shaft, on which is rotatably mounted a disk having a plurality of orifices of various diameters spaced circumferentially about the disk and selectively registerable in the flow passage of the pipe. Closely fitting around the pipe against the disk is a piston having a annular recess. A spring located in the central passage between the piston and the end of the housing opposite the disk forces the piston against the disk, thereby maintaining it in position.

Abstract: A diaphragm particularly for rolling-diaphragm type fluid pressure motors. The invention provides greatly improved service life of the motor, particularly under adverse condition in which conventional diaphragms fail quickly.

Abstract: A translating piston, fluid pressure valve which utilizes a convoluted, elastomeric diaphragm member both to seal a high pressure area and to selectively control exhaust of pressurized fluid therefrom upon movement of the piston of the valve.