Gas turbine metering valve

摘要

A metering valve includes a valve body, a flow tube, an orifice plate, a central flow body, and a mover. The valve body has an inlet and an outlet. The flow tube is carried for axial movement in slidable and sealing engagement with the valve body at an inlet end and an outlet end. The orifice plate has an outlet. The central flow body is provided on an upstream end of the orifice plate and has an annular seal configured to seat into engagement with the outlet end of the flow tube when the flow tube is moved to a downstream position. The central flow body also includes a central, protruding flow diverter upstream and central of the annular seal. The mover is provided in the valve body and is configured to carry the flow tube for displacement of the output end toward and away from the central flow body.

主权项

1. A gas metering valve, comprising:
an electronics enclosure assembly having a cover affixed atop an electronics housing to house electronics; a valve body having an inlet, an outlet, and an explosion-proof housing, wherein said electronics housing at least partially surrounds said explosion-proof housing; an axial flow tube carried for axial movement in sliding and sealing engagement at an inlet end with the valve body inlet and at an outlet end with the valve body outlet, a central flow body having a circumferential seal configured to seat in engagement with the outlet end of the axial flow tube; a proportional electromechanical mover provided in the valve body, control electronics for the mover isolated from the valve body by the explosion-proof housing, and configured to carry the axial flow tube for proportional axial movement to position the outlet end toward and away from the central flow body to adjust flow capacity through the valve body; an axial displacement sensor configured to detect axial positioning of the axial flow tube relative to the central flow body; a temperature sensor configured to detect a temperature of a fluid communicated through the valve body; a pressure sensor configured to detect a pressure of the fluid; and at least one of the axial displacement sensor, the temperature sensor and the pressure sensor are supported by an inlet end plate of the valve body.