Patent ID: 6164328
Filing Date: 2000-12-26
Classification: B60T,F16K,Y10T

Abstract:
A retaining valve including a body having an inlet and outlet each communicating with a first bore; a valve element having a second bore and rotatable in the first bore; the valve element having a first angular position communicating the inlet to the outlet through a first passage in the valve element, a second angular position communicating the inlet to the outlet through a second passage in the valve element and having a restricted flow compared to the first passage and a third angular position connecting the inlet to the outlet through a third passage and having a restricted flow compared to the second passage; a slide in the second bore to uncover the third passage connecting the first and second bores for an inlet pressure above a minimum level; whereinthe slide has a first end positioned between a first end of the second bore adjacent the inlet and the connection of the first, second and third passages to the second bore and has a second end positioned between a second end of the second bore and the connection of the first, second and third passages to the second bore; anda seal is in a recess on the slide at a position on the slide which is between the second end of the second bore and the connection of the first and second passages to the second bore with respect to the inlet for all positions of the slide and which is between the second end of the second bore and the connection of the third passage to the second bore only when the inlet pressure is above the minimum level.