Control system for regulating waterworks pressure
AssigneeGriswold Industries
InventorsMario Ducommun, Hugo van Buel, Arnaud Bonjour, Cedric Lacroute
Life of this patent
Estimating the term…
Abstract
A control system for regulating fluid flow and pressure downstream a waterworks main valve includes a variable orifice device disposed upstream a pressure reducing pilot. The variable orifice device is in fluid communication with the pressure reducing pilot and a cover chamber of the main valve. Opening and closing the variable orifice device causes the main valve to modulate and the pressure of fluid downstream the main valve to be changed while avoiding pressure oscillations during the transition between pressure setpoints.
Claims18
A control system for regulating fluid flow and pressure downstream a waterworks main valve, comprising:
- a pressure reducing pilot having an inlet thereof in fluid communication with a cover chamber of the main valve and an outlet thereof in fluid communication with fluid downstream the main valve;
- and
- a variable orifice device disposed upstream the pressure reducing pilot and having an inlet in fluid communication with fluid upstream the main valve and an outlet thereof in fluid communication with the inlet of the pressure reducing pilot and the cover chamber of the main valve;
- wherein increasingly opening the variable orifice device increases flow to the pressure reducing pilot and/or the cover chamber of the main valve, causing the main valve to close and the downstream pressure to be reduced.
A control system for regulating fluid flow and pressure downstream a waterworks main valve, comprising:
- a pressure reducing pilot having an inlet thereof in fluid communication with a cover chamber of the main valve and an outlet thereof in fluid communication with fluid downstream the main valve, wherein the pressure reducing pilot has a preselected set point establishing a maximum downstream pressure;
- a fixed orifice disposed upstream of the pressure reducing pilot and having an inlet in fluid communication with fluid upstream the main valve and an outlet thereof in fluid communication with the inlet of the pressure reducing pilot and the cover chamber of the main valve;
- and
- a motor-operated variable orifice device disposed upstream the pressure reducing pilot and having an inlet in fluid upstream the main valve and an outlet thereof in fluid communication with the inlet of the pressure reducing pilot and the cover chamber of the main valve;
- wherein increasingly opening the variable orifice increases flow to the cover chamber of the main valve, causing the main valve to close and the downstream pressure to be reduced.
A method for retrofitting a pressure control system of a waterworks main valve, comprising the steps of:
- providing a pressure control system comprising a pressure reducing pilot having an outlet in fluid communication with fluid downstream the main valve and an inlet in fluid communication with a cover chamber of the main valve, and a fixed orifice disposed upstream the pressure reducing valve having an inlet in fluid communication with fluid upstream the main valve and an outlet in fluid communication with the main valve cover chamber and the inlet of the pressure reducing pilot, wherein the pressure reducing pilot has a preselected set point establishing a maximum downstream pressure;
- and
- installing a motor-operated variable orifice device upstream of the pressure reducing valve, an inlet of the variable orifice device being in fluid communication with fluid upstream the main valve and an outlet thereof in fluid communication with the inlet of the pressure reducing valve and the main valve cover chamber, wherein increasingly opening the variable orifice increases flow to the cover chamber of the main valve, causing the main valve to close and the downstream pressure to be reduced.
Dependencies are inferred from the claim text.