Method for removing foreign matter from a digital hydraulic pressure controller

摘要

Foreign matter is removed from a digital hydraulic pressure controller having two portions connectable to each other and each including two valve arrays with a plurality of individually switchable valve means having different flow cross-sections and connected in parallel within a valve array. One valve array of each pressure controller portion can connect a supply line to a controller output line and the other valve array can connect the output line to a drain line. The two pressure controller portions are connected, the valve means having the largest flow cross-section of the valve array of the one portion on the supply line side is opened, the valve means having the largest flow cross-section of the valve array of the other portion on the drain line side is opened and the opened flow path is flushed through the pressure controller with pressurized working fluid, while the other valve means are closed.

主权项

1. A method of removing foreign matter from a pipeline of a digital hydraulic system, wherein the digital hydraulic system employs a pressure controller comprising a first pressure controller portion and a second pressure controller portion which are connectable to each other,
wherein said first pressure controller portion has a first valve array, connected between a supply line and a first output line, and wherein in the first valve array there are a plurality of individually switchable valves that have respective different flow cross-sections, the plurality of individually switchable valves including one of said valves which is largest and which plurality of individually switchable valves are connected in parallel; wherein said first pressure controller portion has a second valve array, connected between a drain line and the first output line and wherein in the second valve array there are a plurality of individually switchable valves that have respective different flow cross-sections, the plurality of individually switchable valves including one of said valves which is largest and which second valve array plurality of individually switchable valves are connected in parallel; and wherein said second pressure controller portion has a first valve array, connected between the supply line and a second output line and wherein in the second pressure controller portion first valve array there are a plurality of individually switchable valves that have respective different flow cross-sections, the plurality of individually switchable valves including one of said valves which is largest and which plurality of individually switchable valves are connected in parallel; wherein said second pressure controller portion has a second valve array, connected between the drain line and the second output line and wherein in the second pressure controller portion second valve array there are a plurality of individually switchable valves that have respective different flow cross-sections, the plurality of individually switchable valves including one of said valves which is largest and which plurality of individually switchable valves are connected in parallel; wherein the method comprises the steps of:
connecting the first pressure controller portion to the second pressure controller portion by connecting the first output line to the second output line;opening the valve having the largest flow cross-section in the first valve array of the first pressure controller portion;opening the valve having the largest flow cross-section of the second valve array of the second pressure controller portion so forming an opened flow path from the supply line through the first and second output lines to the drain line; andflushing the opened flow path through the pressure controllers with a pressurized working fluid, while all other valves are closed.