FLUID VALVE ASSEMBLY, PROCESS VALVE POSITIONER AND USE OF A FLUID VALVE ASSEMBLY IN CONTROL OF A PROCESS VALVE

• Main Authors: OLKKONEN, Mika, JOKINEN, Juuso, HAKOLA, Jyri, GUNELL, Jan, KUKKONEN, Joni
• Format: Patent
• Language: English
• Published: 05.09.2019
• Subjects: ACTUATING-FLOATS; BLASTING; COCKS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR; DEVICES FOR VENTING OR AERATING; ENGINEERING ELEMENTS AND UNITS; FLUID-PRESSURE ACTUATORS; FLUID-PRESSURE ACTUATORS, e.g. SERVO-MOTORS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVEFUNCTIONING OF MACHINES OR INSTALLATIONS; HEATING; HYDRAULICS OR PNEUMATICS IN GENERAL; LIGHTING; MECHANICAL ENGINEERING; SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; TAPS; THERMAL INSULATION IN GENERAL; VALVES; WEAPONS

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.