Pilot-operated pressure control valve

摘要

A pilot-controlled pressure control valve is disclosed. The pilot-controlled pressure control valve has a pilot control stage, a spool valve, and an overload spring. The pilot control stage includes a pilot control piston which has a pilot control spring. The pilot control spring acts in a closing direction of the pilot control stage. The pilot control spring is supported on the spool valve which can be positioned by a control pressure against the force of the overload spring. The control pressure is configured to set a preload of the pilot control spring. At the same time, in a loaded position, in which the pilot control valve has minimum preload, the spool valve rests against a stop. A preload of the overload spring and a position of the stop can be set independently of one another.

主权项

1. A pilot-controlled pressure limiting valve comprising:
a main stage; and a pilot-control stage including a pilot control piston that is loaded by a pilot control spring in a closing direction of the pilot control stage, wherein the pilot control spring is supported on a control slide which is configured to be positioned by a control pressure counter to a force of an overdrive spring in order to adjust a preload of the pilot control spring, wherein, in a loading position in which the pilot control spring has a minimum preload, the control slide bears against a stop, wherein a preload of the overdrive spring is configured to be adjusted by screwing an adjusting sleeve into a sleeve, wherein the stop is formed by a stop screw that is screwed into the adjusting sleeve, the stop screw being individually adjustable in relation to the adjusting sleeve, wherein the preload of the overdrive spring is configured to be adjusted independently of a spacing of the stop from the control slide by (i) screwing the adjusting sleeve relative to the sleeve and (ii) screwing the stop screw relative to the adjusting sleeve, and wherein the spacing of the stop from the control slide is configured to be adjusted independently of the preload of the overdrive spring by screwing the stop screw relative to the adjusting sleeve.