| 摘要 |
<p>A valve assembly is provided for controlled draining of a liquid accumulated in a closed vessel. The assembly includes a body member mounted on the vessel and a valve piece adjustably mounted on the body member for movement between open and closed positions. The body member has a first section extending into the vessel interior wherein the liquid accumulates, a second section secured to the vessel, and a substantially exposed third section. The first, second, and third sections are provided with a common primary passage and an independent common secondary passage. Each passage has one end terminating within the vessel interior and a second end terminating externally of the vessel. The body member first section is provided with a stationary valve seat disposed in aligned and spaced relation with respect to the primary passage one end. The valve piece includes an elongated first element slidably and sealingly mounted within the primary passage. A longitudinally extending bore open at opposite ends is formed in the first section. One end of the bore engages the valve seat and is closed thereby when the valve piece is in a closed position. An exposed flange element encompasses the exterior of the first element and is connected thereto. The flange element is provided with a seal means which sealingly engages and closes off an end of the secondary passage except when the valve piece is in the open position. The seal means effects a predetermined delay in opening the secondary passage relative to the unsealing of the bore end with respect to the valve seat.</p> |
