公开(公告)号：US06202668B1

公开(公告)日：2001-03-20

申请号：US09044765

申请日：1998-03-20

申请人： Robert E. Maki

发明人： Robert E. Maki

IPC分类号： F16K4104

CPC分类号： F16K5/0694 ,  F16K41/026 ,  Y10S277/914 ,  Y10S277/931 ,  Y10S277/938 ,  Y10S277/946 ,  Y10T137/1797

摘要： A valve with fire-resistant seal for use in industrial piping applications. The valve includes a valve body with a valve element therein. The valve is illustrated as a ball valve, but other valve configurations could also be used. A valve stem engages the valve element so that it can be rotated between open and closed positions. A conventional primary seal is used on the valve stem for normal conditions. The valve body defines a body bearing surface, and the valve stem defines a facing stem bearing surface. A thrust bearing is disposed between the body and stem bearing surfaces, and a fire-resistant seal is positioned radially inwardly from the thrust bearing. Initially, the fire-resistant seal is not engaged with at least one of the body or stem bearing surfaces, and the fire-resistant seal has a thickness less than an initial thickness of the thrust bearing. If the valve is subjected to heat such that the thrust bearing is destroyed or damaged, pressure loading on the valve stem forces the fire-resistant seal into sealing engagement between the body and valve stem. At least a portion of the fire-resistant seal is forced into a cavity defined in the body by a chamfered surface.

摘要翻译： 具有防火密封的阀门，用于工业管道应用。 该阀包括其中具有阀元件的阀体。 阀被示为球阀，但也可以使用其他阀构造。 阀杆接合阀元件，使其能够在打开和关闭位置之间旋转。 在正常情况下，在阀杆上使用传统的主密封件。 阀体限定了一个主体支承表面，并且阀杆限定了一个面对的轴承表面。 止推轴承设置在主体和杆支承表面之间，并且防火密封件从推力轴承径向向内定位。 最初，耐火密封件不与主体或杆支承表面中的至少一个接合，并且耐火密封件的厚度小于推力轴承的初始厚度。 如果阀受到热量的影响，使推力轴承破坏或损坏，阀杆上的压力就会迫使防火密封件进入阀体和阀杆之间的密封接合。 耐火密封件的至少一部分通过倒角表面被迫进入在体内限定的空腔中。