No stem guide in bottom flange to collect dirt. These valves are self-aligning and the guiding of the disc is independent of the bolted bottom flange.

• 底部法兰内不需要阀杆引导,避免淤积污垢。这些阀门是自我对齐,阀瓣的引导不依赖于螺栓底部法兰。