Butterfly Valve Series

Product drawing»

Structural drawing»

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Butterfly valve relatively simple design

2011-12-29

One important feature of the new valve construction resides in an actuating shaft supporting structure which provides a combined shaft bearing and seal arrangement for reliably preventing the escape of fluid from the valve assembly. In a preferred valve assembly embodying this feature a valving member is supported in a valve body for rotation by an actuating shaft which extends through openings in the valve body.BUTTERFLY VALVES A shaft supporting structure supports the shaft for rotation while sealing against the loss of fluid from the assembly. The supporting structure includes a band structure extending about the valve body and defining recesses aligned with the valve body openings.

Resilient flexible elements within each recess surround the shaft. The band structure is secured about the valve body so that the resilient elements are compressively engaged with the valve body, band structure and the shaft to provide a bearing support for the shaft while sealing against leakage.

Another important feature of the invention resides in the construction of a butterfly valve assembly having a composite valving member enabling effective and reliable valving member operation while minimizing sticking or jamming in the closed position and which enables simplified assembly of the valve. Butterfly ValvesThe preferred valving member includes a supporting hub, a disk-like valving element supported by the hub and sandwiched between plates which are clamped against the valving member by the hub. The plates are resiliently deflectable and tend to deflect when the valving member is subjected to forces which would otherwise jam the valve closed.

The hub is constructed from a structurally strong flowable metallic material and is deformed to clamp the plates against the valving element when the valving member is being assembled. The valving element is controllably and lightly compressed between the plates so that a fluid-tight seal between the hub and the valving element is established.

Another important feature of the valving member construction resides in the interconnection between the shaft and the hub.Butterfly Valves The hub defines a shaft-receiving opening through which the shaft is pressed during assembly of the valve. The shaft and hub opening are provided with a spline-like driving interconnection which is formed by a series of spline-like teeth on the shaft which are driven into the hub material to yield and flow the hub material into conformity with the spline teeth. The valving element support plates resiliently deflect in response to relatively high force levels transmitted to the valving member, and tend to resiliently cushion shock loadings which might otherwise be applied to the interconnection between the hub and the shaft.

Other features and advantages of the present invention will become apparent from the following detailed description of a preferred embodiment made in reference to the accompanying drawings which form a part of the specification.

 

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