COUPLING WITH FEMALE HALF HAVING INTERNAL PRESSURE RELIEF

摘要

A coupling having male (1) and female (2) halves is disclosed. Typically the female half is under pressure. The female half may be mounted to an implement and when coupled to a male coupling on the tractor. It supplies hydraulic fluid to the driven device. The female half has three valves: a main valve (41), a relief valve (51) and a sliding sleeve valve (42). The female half, when coupled, opens the sliding sleeve valve first followed by the opening of the relief valve which is followed by the opening of the main valve. The relief valve is designed to reduce pressure behind the main valve so as to permit easy coupling under pressure when the female half is under pressure. During the uncoupling process, the main valve closes first followed by the closure of the relief valve which is followed by the closure of the sliding sleeve valve. The relief valve is a ball and seats against an elastomeric seal mounted in the back side of the main valve. A push pin (47) having flat edges operates the relief valve. The main valve includes ports for increasing the capacity of the relief valve during coupling of the male and female halves together.