| 摘要 |
A valve member including a flexible diaphragm movable into and out of engagement with a valve seat to close and open the valve, respectively. A rigid support plate rests against the face of the diaphragm opposite the face which engages the valve seat. A stem projects from the plate, through a hole in the diaphragm and into the orifice surrounded by the valve seat. The diaphragm and plate are not rigidly secured together, so that the entire diaphragm is free to flex with respect to the support plate. A pilot passageway may extend completely through the plate and stem. The stem is long enough such that the lower end of the pilot passageway is below the plane of the valve seat even when the valve is open. An abutment, such as an outwardly projecting bead, on the lower end of the stem prevents accidental separation of the plate and diaphragm before they are assembled with a valve.
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