PNEUMATIC ACTUATOR HAVING DIAPHRAGM RETENTION RING

申请公布号：CA2749504(C)

申请号：CA20092749504

申请日期：2009.12.30

申请公布日期：2015.12.29

申请人：

FISHER CONTROLS INTERNATIONAL LLC

发明人：MCCARTY, MICHAEL WILDIE;GRABAU, TED DENNIS

分类号：F16K31/126;F16J3/02

主分类号：F16K31/126

摘要：<p>A pneumatic valve actuator for moving the valve stem of a control valve comprises an upper casing (56) and a lower casing (58) each having flanges (78, 80), a diaphragm plate operatively coupled to the valve stem, a spring arranged to bias the diaphragm plate in a first direction, a diaphragm (70) movable in conjunction movement of the diaphragm plate, an air inlet defined in the casing and arranged for attachment to an air supply source to bias th diaphragm plate in a second direction, and a ring (76) disposed between the upper flange and the lower flange and positioned to engage the outer portion of the diaphragm. The ring includes a protrusion (96) positioned to engage a surface of the outer portion of the diaphragm.</p>

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