Patent ID: 6631880
Filing Date: 2003-10-14
Classification: F16K

Abstract:
A preventative stop valve system for a wheeled truck trailer of the trailer type comprising air pressure activated brakes; a brake air line for delivering pressurized air to the brakes; a hydraulic fluid activated trailer lift cylinder; a hydraulic fluid line for delivering pressurized hydraulic fluid to the lift cylinder; the stop valve system comprising:a. an elongate valve housing positioned in the hydraulic fluid conduit line, the valve housing comprising: external sidewalls, first and second end walls, and an internal longitudinal chamber defined by internal sidewalls; a transversely oriented fluid intake bore extending through the housing external sidewall in communication with the internal housing chamber and the hydraulic fluid conduit line; a transversely oriented fluid outlet bore extending through the housing external sidewall in communication with the internal housing chamber and the hydraulic fluid conduit line, the fluid outlet bore establishing a fluid path with the fluid inlet bore though the housing chamber; an air intake portal extending through the first end wall in communication with the internal housing chamber and connected by a conduit to the trailer air conduit line; b. an elongate piston seated within the housing chamber and reciprocally moveable between an open position and a closed position within the chamber, the piston comprising a first portion dimensioned to obstruct the fluid path between the fluid inlet bore and fluid outlet bore with the piston in the closed position; and the piston further comprising a second portion configured to allow the flow of fluid between the fluid inlet bore and fluid outlet bore with the piston in the open position.