Differential pressure regulator valve

摘要

A regulator valve having a diaphragm which responds to changes in an operational fluid pressure differential by overcoming a first spring and moving a stem of a first spool away from a stop to thereafter allowing a supply fluid pressure to create a regulator-fluid pressure differential across a second spool. The regulator fluid pressure differential overcomes a second spring and moves a cylindrical body of a second spool to position a land and allow supply fluid to freely flow to a reservoir. Flow of supply fluid to the reservoir sequentially reduces the supply fluid pressure to permit the first spring to reposition the stem of the first spool in a wall to terminate communication of the supply fluid pressure to the second spool. A passage in the second spool allows supply fluid pressure to bleed to a reservoir and thereby proportionally reduce the regulator fluid pressure differential. At some regulator fluid pressure differential, the second spring moves cylindrical body of the second spool and positions land to inhibit the flow of supply fluid to the reservoir and establish a predetermined fluid pressure for the supply fluid.