Ball Valve and Butterfly Valve Distributor

by Happy Great happygreat23 During continued rotational movement of disc 16, the fins remain in compressive get in touch with with the semicircular sections of the sealing ring and mechanically retain them within the groove until the differential fluid forces tending to dislodge them from the groove have substantially equalized. Therefore, the fins provide a positive means for mechanically retaining the sealing ring in its groove, rather than depending upon a extremely rapid equalization of upstream and downstream pressures as will be the case with a disc including only grooves or serrations, e.g., <a href="http://www.china-zdvalve.com/product/flange-adaptor-flange-adaptor.html">Flange adaptor</a>c construction disclosed within the above-identified Bryant patent.

When the disc is rotated from the open position towards the closed position, outer faces 82 of fins 78 and 80 slidably engage the semicircular sections of the sealing ring before the disc reaches a position where the differential pressure across the disc reaches a level where the fluid forces would tend to dislodge the semicircular sections of the sealing ring from the groove. Throughout continued closing movement of the disc, the fins mechanically retain the semicircular sections of the sealing ring in the groove until the seating surface of the disc sealingly engages them.

The fins can be conveniently formed as an integral component of the disc. Since the seating surface of the disc and the outer faces of the fins define a segment of a ball or sphere the outer surfaces thereof can be conveniently machined to close tolerances by conventional machine lathing techniques.

FIGS. 5 and 6 illustrate an alternate construction for the disc. In this alternate construction, the valve body and the sealing ring can be constructed within the same manner as illustrated in FIGS. 1-4 and disc 16 is replaced with disc 100 generally in the form of a slotted or fluted ball or sphere. Disc 100 includes a central, generally planar and circular body 102 having a spherical seating surface comparable to disc 16 in FIGS. 1-4 for shutting off flow when the valve is in a closed position. More particularly, body 102 has diametrically opposed, enlarged hubs 104 and 106 such as coaxial recesses for receiving respective stems. Like hubs 18 and 20 in the construction illustrated in FIGS. 1-4, the outer faces 108 of hubs 104 and 106 are spherically shaped, are disposed in concentric relation to spherical bottom walls of respective circular groove portions and compressingly engage the circular sections of the sealing ring throughout all positions of disc 100. The opposed, external circumferential surfaces 110 and 112 of body 102 extending between hubs 104 and 106, like semicircular portions 70 and 72 of disc 16 in FIGS. 1-4, are spherically shaped and sealingly engage corresponding semicircular sections of the sealing ring when disc 100 is in a closed position.

Extending from the opposite sides of body <a href="http://www.china-zdvalve.com/product/flange-adaptor-flange-adaptor.html">Flange adaptor supplier</a>plurality of laterally spaced vanes 114 which slidably and compressively engage the semicircular sections of the sealing ring at all times apart from when the valve is in a closed position. The spacings 116 between vanes 114 serve as fluid flow passages when disc 100 is in an open position. Thus, the semicircular sections of the sealing ring are mechanically retained in the groove by the disc all through all positions thereof throughout opening and closing of the valve.

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Created on Dec 31st 1969 18:00. Viewed 0 times.

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