Caution: The sealing surface for the diaphragm on the top flange of the valve body receives special factory preparation to enhance sealing with PTFE diaphragms.

• 警告：用于阀体法兰上的隔膜的密封面在工厂受到特殊的处理，以强化聚四氟乙烯隔膜的密封性能。