Chapt06

98 although k is dimensionless it unfortunately is

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Unformatted text preview: ere are many different valve designs in commercial use. Figure 6.17 shows five typical designs: (a) the gate, which slides down across the section; (b) the globe, which closes a hole in a special insert; (c) the angle, similar to a globe but with a 90° turn; 7 | v v This section may be omitted without loss of continuity. | e-Text Main Menu | Textbook Table of Contents | Study Guide 368 Chapter 6 Viscous Flow in Ducts h D h D D (a) (b) D D (d) Fig. 6.17 Typical commercial valve geometries: (a) gate valve; (b) globe valve; (c) angle valve; (d) swing-check valve; (e) disktype gate valve. D D h h D (c) (e) (e) (d) the swing-check valve, which allows only one-way flow; and (e) the disk, which closes the section with a circular gate. The globe, with its tortuous flow path, has the highest losses when fully open. Many excellent details about these and other valves are given in the handbook by Lyons [35]. Table 6.5 lists loss coefficients K for four types of valve, three angles of elbow fitTable 6.5...
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This note was uploaded on 10/27/2009 for the course MAE 101a taught by Professor Sakar during the Spring '08 term at UCSD.

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