Patent ID: 8899549

Claim:
A drain valve base, comprising an upper connection seat and a lower connection seat which are integrally formed, the upper connection seat being connected with the lower connection seat by connection arms which are provided at intervals, hollow portions being formed between every two connection arms, the lower connection seat having an annular surface on a top end thereof, a through drain outlet being formed in a center portion of the lower connection seat, one side of the annular surface being formed with a water-seal convex ring located close to the drain outlet, the water-seal convex ring having a water-seal surface on a top end thereof, and blocking devices which can stop water flow being provided on at inner side and an outer side of the water-seal convex ring, wherein the blocking devices comprise an annular stop wall disposed on the annular surface at the outer side of the water-sealing convex ring, the stop wall being integrally connected with the connection arms, a plurality of guiding cylindrical posts being provided between the stop wall and the water-seal convex ring and at an inner side of the water-seal convex ring, the guiding cylindrical posts at the outer side of the water-seal convex ring having a height greater than that of the stop wall, the guiding cylindrical posts at the inner side of the water-seal convex ring having a height less than that of the water-seal convex ring.