| 摘要 |
<p>A low profile backwater valve includes a hollow valve body having an inlet, an outlet, a top and a bottom. A pivoting valve member that is buoyant in water moves between a normally open position along the bottom of the valve bod} and a closed position sealing the inlet. A locking member is positioned in the hollow valve body. The locking member has a release position below the pivot axis of the valve member that permits the valve member to pivot freely, and a locking position immediately adjacent to the valve member that secures the valve member in the closed position. A handle is attached to the locking member and is accessible from outside and from the top of the hollow valve body. The handle moves the locking member between the release position and the locking position.</p> |
