| 摘要 |
<p num="1"><br/>A canister type flush valve has an upright cup-shaped hollow float working <br/>under <br/>buoyancy forces without a captured air volume that controls the valve during a <br/>flush <br/>cycle. Hooded bleed openings at a bottom wall of the float can be sized and <br/>numbered to selectively control the closuring timing of the valve. Baffles of <br/>the hood <br/>bleed openings redirect water bleeding into the float to prevent the water <br/>from <br/>spraying up against the top of the tank. The geometry of a seal retaining <br/>groove is <br/>designed to reduce leakage at the float/seal interface. For example, the <br/>groove has <br/>an annular wall with a compound profile forming a non-cylindrical, preferably <br/>serpentine, seal contact area. The seal is backed by a slotted flange located <br/>just <br/>above the retaining groove.<br/>
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