艾默生过程管理公司已推出了Fisher POSI-Seal ®A81回转阀。A81紧密截断和长密封寿命使其适合开/关型应用。通过阀门密封圈的压力辅助作用,阀门可以实现完全截断。偏心阀瓣的开闭路径使与密封圈的接触减到最小,从而降低了密封的磨损。可互换的密封技术使A81阀体可采用软密封和金属密封。Posi-seal阀门适合于自动开关、直角回转,一般可用FieldQ®齿条齿轮执行机构。
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