In a gate valve of the character described, a plastic valve body having a flow passage extending horizontally through said valve body, said body having downwardly convergent valve seat surfaces extending transversely of the axis of said horizontal flow passage and inclined at an angle to said axis, Gate Valvessaid surfaces being flat and being devoid of sealing beads projecting from said surfaces, Resilient Seated Gate Valvesand a plastic gate having substantially oppositely disposed downwardly convergent surfaces lying in planes extending transversely of the axis of said flow passage and parallel with the planes of said valve seat surfaces,GATE VALVES said gate surfaces having sealing beads of elliptical configuration molded integrally with said gate and projecting outwardly from said gate surfaces and adapted for sealing engagement with said valve seat surfaces.

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