Abstract: A reinforced valve member including a body having upstream and downstream sides and an annular rim forming a first sealing surface. A frusto-conical portion of the body extends upstream from the first sealing surface and displays a second sealing surface. A substantially conical flow diverter extends upstream from the frusto-conical portion and a plurality of guide fins extend upstream from the flow diverter. The annular rim, frusto-conical portion and flow diverter are all coaxially aligned on the longitudinal axis of translation of the valve member. A dish-shaped reinforcing washer is embedded in the valve member body and includes a concave side oriented upstream and a convex side oriented downstream.