Applied Product Catalog 2017 2018 Page 805 Hydraulic Products

805 Hydraulic Products All Things Industrial Hydraulic Couplings Quick disconnect couplers allow for attaching and removing hoses easily with the use of a variety of tools. Hydraulic disconnects have a check valve in both the coupler and plug to prevent fluid loss or contamination from entering the system. The very properties that make a compressed media useful in almost every area of modern life can also make them dangerous when mishandled. These quick disconnect couplings have been carefully engineered to meet specific industry requirements while maintaining abundant safety margins. If quick disconnect couplings are not used in the correct applications or are incorrectly applied, accidents and downtime can result. Inform Applied of the application and pressures involved when ordering quick disconnect couplings so the right coupling for the application can be supplied. The use of S.T.A.M.P.E.D. will help in the proper selection of quick disconnect coupling products. When in doubt, Applied Industrial Technologies stands ready to provide information, coupling recommendations and additional data to help resolve quick disconnect coupling related issues. PROPER SELECTION OF QUICK DISCONNECT COUPLINGS S.T.A.M.P.E.D. QUESTIONS AND SELECTION PROCESS Size Couplings should be selected to handle the flow and pressure requirements of the system. Excessive pressure drop will result in restricted flow, slower actuation, higher fluid velocity, heat generation and eventually a breakdown of fluids, seals and components. 1. What size coupler is required? 2. What is the maximum allowable pressure drop for the application? 3. Are there any size restrictions due to a "tight-spot" installation? Temperature Media and ambient temperatures must be limited to the specific operating parameters of the selected sealing materials. Excessive cold will reduce sealing capability while excessive heat can cause the premature breakdown of body and valve seals. 1. What is the media/fluid temperature? 2. What is the ambient temperature? 3. Are there any 'flash' heat sources near the connection? Application Quick coupling interchangeability is a key issue that needs to be closely reviewed. There are several instances where non-interchangeable couplers and nipples may connect. This is very dangerous and these couplings should never be pressurized. Be sure to match like series couplers and nipples! 1. Is an industry interchange coupler required? 2. What are the functional requirements of the coupling? 3. Have there been any problems with other couplings in this application? Media Quick disconnect couplings are available with a variety of body materials and seal options. Exposure to harsh and corrosive operating environments may reduce service life. Several quick couplings spill fluid upon disconnection which may be a safety concern! 1. Which seal and body materials are compatible with the system's fluid? 2. Is air inclusion, system contamination or fluid loss a concern? 3. Is this fluid dangerous to the operator? Pressure During the selection process, the published working pressure of the coupling must be equal to or greater than the maximum system pressure. Surge pressures in a fluid power system, higher than the rated pressure, will shorten the service life of the coupling. 1. Is the pressure "Static" or "Dynamic"? 2. What is the maximum operating pressure required for the application? 3. Are there any pressure spikes in the system? Ends Many end configurations are available and each one has specific operating parameters. For example, working pressure of couplings utilizing Hose Barb or Collar Hose Barb end connections may be dramatically reduced. If in doubt, test under controlled conditions for suitability to the application. 1. What end configuration and size are required? (Male Threaded, Female Threaded, or Hose Barb) 2. Does the chosen end configuration support the application parameters and system pressure? 3. What is the ideal valving configuration? (Single Shut-off, Double Shut-off, or Unvalved) Details Forgotten or missed application details can cause a failure if not properly addressed! Be meticulous in the assessment of your application to ensure that all parameters are considered in the selection of the proper quick disconnect coupling. 1. Are there any side-load, vibration or swivelling problems associated with the application? 2. Does the coupling require a safety sleeve-lock mechanism? 3. Are there any environmental concerns that need to be addressed? Source: Dixon Quick Coupling

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