SEGMENTED SOCKET, RING ANDBAND ATTACHED.— The segmented, ring andband attached socket consists of three or moresegments. As with the bolt-together segments, thesegments, ring and band are put on the hose afterinsertion of the nipple. A special tool is requiredto compress the segments.SEGMENTED SOCKET, RING AND BOLTATTACHED.— The segmented, ring and boltattached socket consists of three or moresegments. As with other segmented socket-typefittings, the segments, ring, and nuts and boltsare put on the hose after insertion of the nipple.SOLID SOCKET, PERMANENTLYATTACHED.— This type of socket is perma-nently attached to the hose by crimping orswaging. It is not reusable and is only foundon hose assemblies where operating conditionspreclude the use of other fitting types. Hoseassemblies with this type of fitting attachment arepurchased as complete hose assemblies from themanufacturer.QUICK-DISCONNECT COUPLINGSSelf-sealing, quick-disconnect couplings areused at various points in many fluid powersystems. These couplings are installed at locationswhere frequent uncoupling of the lines is requiredfor inspection, test, and maintenance. Quick-disconnect couplings are also commonly used inpneumatic systems to connect sections of air hoseand to connect tools to the air pressure lines. Thisprovides a convenient method of attaching anddetaching tools and sections of lines without losingpressure.Quick-disconnect couplings provide a meansfor quickly disconnecting a line without the lossof fluid from the system or the entrance offoreign matter into the system. Several types ofquick-disconnect couplings have been designed foruse in fluid power systems. Figure 5-23 illustratesFigure 5-23.—Quick-disconnect coupling for air lines.a coupling that is used with portable pneumatictools. The male section is connected to the toolor to the line leading from the tool. The femalesection, which contains the shutoff valve, isinstalled in the pneumatic line leading fromthe pressure source. These connectors can beseparated or connected by very little effort on thepart of the operator.The most common quick-disconnect couplingfor hydraulic systems consists of two parts, heldtogether by a union nut. Each part contains avalve which is held open when the coupling isconnected, allowing fluid to flow in eitherdirection through the coupling. When thecoupling is disconnected, a spring in each partcloses the valve, preventing the loss of fluid andentrance of foreign matter.MANIFOLDSSome fluid power systems are equipped withmanifolds in the pressure supply and/or returnlines. A manifold is a fluid conductor thatprovides multiple connection ports. Manifoldseliminate piping, reduce joints, which are oftena source of leakage, and conserve space. Forexample, manifolds may be used in systems thatcontain several subsystems. One common lineconnects the pump to the manifold. There areoutlet ports in the manifold to provide con-nections to each subsystem. A similar manifoldmay be used in the return system. Lines from thecontrol valves of the subsystem connect to the inletports of the manifold, where the fluid combinesinto one outlet line to the reservoir. Somemanifolds are equipped with the check valves,relief valves, filters, and so on, required for thesystem. In some cases, the control valves aremounted on the manifold in such a manner thatthe ports of the valves are connected directly tothe manifold.Manifolds are usually one of three types—sandwich, cast, or drilled. The sandwich type isconstructed of three or more flat plates. Thecenter plate (or plates) is machined for passages,and the required inlet and outlet ports are drilledinto the outer plates. The plates are then bondedtogether to provide a leakproof assembly. The casttype of manifold is designed with cast passagesand drilled ports. The casting may be iron, steel,bronze, or aluminum, depending upon the typeof system and fluid medium. In the drilled typeof manifold, all ports and passages are drilled ina block of metal.5-19
Integrated Publishing, Inc. - A (SDVOSB) Service Disabled Veteran Owned Small Business