Abstract: A multiple opening sleeve valve is provided with a gate movable to control flow or pressure without the need for axial movement of a component through a pressure-containing seal. A gate actuator can include a drive rod and nut coupled to a gate substantially internal to the valve housing without the need for grease or similar external lubrication. The valve can provide for relatively high in-line gate-moving force, a reduction in force or torque requirements for operation, increased ease of wear-part replacement and decreased overall valve length, compared to previous valve configurations of comparable size or capacity.

Abstract: A multi-mode signal measurement system provides at least True RMS and Average RMS signal measurement modes in one system in response to a measurement mode selection made by an operator. The system controls the processing of the input signal by a selected signal measurement unit according to the operator selected signal measurement mode. After signal processing is complete, a display unit displays a value of the measurement of the input signal according to the selected measurement mode. Other measurement modes providing peak value and resistance measurement readings may also be provided.