PRECISION METERING VALVE

摘要

Precision metering valves include a body (12) having a fluid inlet port (14), a fluid outlet port (16), a fluid chamber (18) interposed therebetween, and an orifice (38) disposed within the fluid chamber. The orifice has an opening that extends a length along the fluid chamber. A movable element (26) is disposed within the fluid chamber, and includes a stem that is at least partially disposed within the orifice to control the flow of fluid through the valve. The stem and/or the orifice includes an outside surface feature configured to adjust the flow rate of fluid through the valve as a function of stem insertion depth within the orifice. A thin- walled section extends from the stem and extends axially therefrom. The thin- walled section has a sufficient length to facilitate axial stem movement of the stem by rolling transfer. A flange (50) projects from the thin- walled section and extends circumferentially therearound.