A simple manifold is illustrated in figure 5-24.This manifold contains one pressure inlet port andseveral pressure outlet ports that can be blockedoff with threaded plugs. This type of manifoldcan be adapted to systems containing variousnumbers of subsystems. A thermal relief valvemay be incorporated in this manifold. In this case,the port labeled T is connected to the return lineto provide a passage for the relieved fluid to flowto the reservoir.Figure 5-25 shows a flow diagram in amanifold which provides both pressure and returnpassages. One common line provides pressurizedfluid to the manifold, which distributes the fluidto any one of five outlet ports. The return sideof the manifold is similar in design. This manifoldis provided with a relief valve, which is connectedto the pressure and return passages. In the eventof excessive pressure, the relief valve opens andallows the fluid to flow from the pressure side ofthe manifold to the return side.Figure 5-25.—Fluid manifold—flow diagram.PRECAUTIONARY MEASURESThe fabrication, installation, and maintenanceof all fluid lines and connectors are beyond thescope of this training manual. However, there aresome general precautionary measures that applyto the maintenance of all fluid lines.Regardless of the type of lines or connectorsused to make up a fluid power system, makecertain they are the correct size and strength andperfectly clean on the inside. All lines must beabsolutely clean and free from scale and otherforeign matter. Iron or steel pipes, tubing, andfittings can be cleaned with a boiler tubewire brush or with commercial pipe cleaningapparatus. Rust and scale can be removed fromshort, straight pieces by sandblasting, providedthere is no danger that sand particles will remainlodged in blind holes or pockets after the pieceFigure 5-24.—Fluid manifold.5-20
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