Patent ID: 6220270
Filing Date: 2001-04-24
Classification: B60T,Y10T

Abstract:
In a brake system having first and second brake valves, first and second brake lines and a velocity fuse valve for controlling communication between each of the brake valves and a corresponding one of the brake lines, the velocity fuse valve comprising:a valve housing having a valve bore extending therethrough, the valve housing having a first inlet communicated with the first brake valve, a second inlet communicated with the second brake valve, a first outlet communicated with the first brake line and a second outlet communicated with the second brake line;a first pilot chamber communicated with the first outlet, a second pilot chamber communicated with the second outlet;a valve member slidably received in the bore and movable in response to fluid pressure communicated to the pilot chambers,the valve member having a first position wherein the first inlet is communicated with the first outlet and with the first pilot chamber, and the second inlet is communicated with the second outlet and the second pilot chamber, the valve member having a second position wherein the first inlet is blocked, wherein the first outlet is communicated with the first pilot chamber, and wherein the second inlet is communicated with the second outlet and with the second pilot chamber, the valve member having a third position wherein the second inlet is blocked, wherein the second outlet is communicated with the second pilot chamber, and wherein the first inlet is communicated with the first outlet and with the first pilot chamber, the valve member being movable to the second position in response to reduced pressure in the first outlet, the valve member being movable to the third position in response to reduced pressure in the second outlet, the first pilot chamber is communicated with the first outlet via a first dashpot passage and a first orifice, and the second pilot chamber is communicated with the second outlet via a second dashpot passage and a second orifice.