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

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)