发布时间:2025-02-01 18:04:50
SW flange是承插焊法兰,PJ flange是对焊/平焊环松套法兰,RF是指法兰密封面为突面。希望我的回答对你有所帮助!
a21h弹簧微启式安全阀弹簧微启式外螺纹安全阀主要零部件材料
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