Abstract: A multi-orifice plate carrier for use in a modified orifice fitting and a differential pressure-operated, mechanical valve and piston system for vertically and horizontally adjusting the multi-orifice plate carrier to facilitate recordation of various line pressures on an appropriate recording meter. In a preferred embodiment two or more pressure recording meters are fitted with corresponding meter valves and a common pressure selector valve, along with a spring-loaded or fluid-operated plate piston connected to the multi-orifice plate carrier and a horizontal adjusting bar engaging the plate piston rod, to facilitate vertical adjustment of the multi-orifice plate carrier, horizontal shifting of the orifice plate carrier and resulting alignment of an orifice of selected diameter in the line bore of the orifice and reading of a corresponding recording meter responsive to automatic operation of the pressure selector valve and meter valves.

Abstract: An exhaust reduction system for reducing gas emissions in pipeline controlling devices which operate control valves, which system adjusts and reduces the pressure of a control stream of gas from a conventional line pressure regulator to the control valves. In a preferred embodiment the exhaust reduction system operates in cooperation with the conventional line pressure regulator which reduces the pressure of the gas from the pipeline to a selected system pressure and includes a system high pressure regulator, a system low pressure regulator and in some cases, a selector relay, for further reducing the pressure of the incoming gas and channeling the gas at reduced pressure to at least one controller.

Abstract: A multi-orifice plate for use in a modified orifice fitting and a differential pressure-operated, mechanical valve and piston system for vertically adjusting the multi-orifice plate to facilitate recordation of various line pressures on an appropriate recording meter. In a preferred embodiment two or more pressure recording meters are fitted with corresponding meter valves and a common pressure selector valve, along with a spring-loaded plate piston connected to the multi-orifice plate, to facilitate operation of the plate piston and vertical shifting of the orifice plate, alignment of an orifice of selected diameter in the line bore of the orifice fitting and reading of a corresponding recording meter responsive to automatic operation of the pressure selector valve and meter valves. Fully automatic adjustment of the multi-orifice plate may be effected by implementing a remote, radio-operated transceiving unit to actuate a pneumatic switching valve and actuate the pressure selector valve and plate piston.