초록 ▼

A pressure regulating spool valve 10 having a body 25 within which a spool 20 is moved in a dither motion by a proportional solenoid 15 has a spool land 40 separating high and low pressure fluids and spanning and cooperating with a regulated port recess 51 in body 25 for variably opening high and lo

A pressure regulating spool valve 10 having a body 25 within which a spool 20 is moved in a dither motion by a proportional solenoid 15 has a spool land 40 separating high and low pressure fluids and spanning and cooperating with a regulated port recess 51 in body 25 for variably opening high and low pressure windows 54 and 55. With opposite edges 52 and 53 of recess 51 spaced apart by a distance X, the opposite edges 42 and 43 of spool land 40 spaced apart by a distance Y, and the dither motion imposed on spool 20 by solenoid 15 having an axial excursion A, the relationship X≤Y≤(X+A) applies. This makes the alternating overlap of spool land 40 with recess edges 52 and 53 equal to or less than the dither excursion so that high and low pressure windows 54 and 55 of the regulated port 50 are opened for a predetermined portion of each half cycle of the dither motion.

대표청구항 ▼

In a pressure regulating spool valve having a body within which pressurized fluid is admitted to a balanced recess in a spool moved in a dither motion by a proportional solenoid so that a land of said spool spans a regulated port recess in said body and variably opens high and low pressure windows a

In a pressure regulating spool valve having a body within which pressurized fluid is admitted to a balanced recess in a spool moved in a dither motion by a proportional solenoid so that a land of said spool spans a regulated port recess in said body and variably opens high and low pressure windows at respective opposite edges of said recess, an improvement comprising: a. circuit means for controlling said solenoid to make said dither motion of said spool follow the relationship X≤Y≤(X+A), wherein X=the distance between opposite edges of said recess, Y=the distance between opposite edges of said land, and A=an axial excursion of said dither motion; b. a socketed plug closing an end of said valve body in a region spaced from said solenoid; c. a pin axially movable within said socket in said plug, said pin engaging said spool and having a diameter substantially smaller than said spool; and d. means for resisting movement force of said solenoid, including a fluid passageway applying regulated pressure fluid to a socket end of said pin and a compression spring engaging said plug and said spool.