Metso Flow Control Oy

Neles Finland Oy

Jan Gunell

Jyri Hakola

Kalle Vuorio

Juuso Jokinen

Mika Olkkonen

Joni Kukkonen

A fluid valve assembly having a central bore and a stem axially-movable within the central bore and actuated by an axial pilot force and an axial counter force. An inner supply pressure chamber is provided to retain a stabilized supply pressure providing the axial counter force affecting on the stem. A seal member is arranged coaxially with the stem between the inner supply pressure chamber and an outer supply pressure chamber which is connected to a supply pressure input line. A metering edge is arranged coaxially with the stem to control fluid flow from the outer supply pressure chamber to an actuator chamber. Means are provided to stabilize the supply pressure in the inner chamber against sudden pressure drops in the outer supply pressure chamber.

Fluid valve assembly, process valve positioner and use of a fluid valve assembly in control of a process valve

A fluid valve assembly for controlling a single-acting or double-acting actuator comprises a valve body having a central bore with at least one supply port for receiving a supply of fluid under pressure, at least one actuator port (C,C) for providing a control fluid pressure to an actuator, and at least one exhaust port (EX,EX). At least one pair of counter-acting metering edges operationally tied together by a stem movable within central bore in an axial direction a pilot force. Each metering edge of each counter-acting pair comprises a mating seat surface (PS,PS,PS,PS) on the valve body or the stem, and a poppet ring (PR,PR, PR,PR) supported by a flexible element (SD,SD,SD,SD) to the valve body or the stem in a manner allowing a relative axial movement of the poppet ring and the supporting valve body or stem also in a closed state of the respective metering edge.

Fluid valve assembly and a process valve positioner

Growing community of inventors

Söderkulla, Finland

Jan Gunell