凸耳式阀门应该有能力在全压力下提供双向“终端应用”，不需要下游蒸汽无口法兰。
Lug style valves shall be capable of providing bidirectional "Dead End Service" at full pressure without the need for down stream blind flange.
内筒的一端端口法兰内径处设有止口，用于与相邻筒节的对应端无止口法兰插接。
The inner diameter part of the flange at one port of one end of the inner cylinder is provided with a rabbet for splicing with a flange without a rabbet at a corresponding end of an adjacent elbow.
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