Technical handbook for the paddy rice postharvest industry in ...

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78 POSTHARVEST INDUSTRY HANDBOOKTwo- and three-way grain valves are the most common. They operate on eitherthe bucket-type gate as shown in Figure 3.51 or the flop gate as shown in Figure 3.52.Spring tension enables the valve to open in either direction, The internal gate isfabricated of abrasive-resistant steel. The valve may be operated by chain or cable.Normal dimensions for these valves are given below:Valve dimensions (cm)A B C D E15-cm20-cmspoutingspouting21.626.715.220.338.145.731.736.850.857.225-cm spouting 31.825.454.640.661.0Two- and three-way valves are also available with round inlets and outlets. Theycome in different styles (Fig. 3.53) depending on the installation requirements. Thesame general dimensions given for gates with square inlets and outlets apply.Many installations require multiple distribution valves. An elevator in a dryingsystem may be connected to six tempering bins and one dryer. For more than threeoutlets, distributors are used. Typical distributors are shown in Figure 3.54. Notethat the inside of each turns to make connections with the desired opening or spout.Distributors can be made with many spouts and usually contain one spout as anoverflow. Dimensions of a typical distributor are shown in Figure 3.55.3.52 Three-way valve withflop gate. (top)3.53. Two-way and threewayvalve arrangements.(right)
79 CONVEYING3.54. Five-way distributor.(top)3.55. Schematic and dimensionsfor two sizes ofdistributors. (upper right)3.56. Schematic of elevator.A, total height; B,head clearance; C, normallyquoted effective elevatingheight; D, headloss due to distributor orvalves; E, effective elevatingheight with distributor;F, hopper height upleg feed; G, hopper heightdown leg feed. (lowerright)
Page 1 and 2: Chapter 3CONVEYINGIn the paddy post
Page 3 and 4: 47 CONVEYINGTypesBucket elevators a
Page 5 and 6: 49 CONVEYING3.6. Elevator discharge
Page 7 and 8: 51 CONVEYING3.7. Elevator head show
Page 9 and 10: 53 CONVEYING8.11. Boot section desi
Page 11 and 12: 55 CONVEYING3.15. Elevator with pla
Page 13 and 14: 57 CONVEYINGments vary with segment
Page 15 and 16: 59 CONVEYINGHorsepower requirements
Page 17 and 18: 61 CONVEYING3.24. Standard hangerbe
Page 19 and 20: 63 CONVEYING3.28. Drive arrangement
Page 21 and 22: 65 CONVEYINGWhen the auger is opera
Page 23 and 24: 67 CONVEYINGExample: Determine belt
Page 25 and 26: 69 CONVEYINGeither side of the belt
Page 27 and 28: 71 CONVEYING3.40. Self-aligning cam
Page 29 and 30: 73 CONVEYING3.44. Wing-type pulley.
Page 31 and 32: 75 CONVEYING3.47. Cross section ofc
Page 33: 77 CONVEYINGMost spouting is straig

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