![]() ![]() This design is advantageous when you wish to fill or evacuate pressure from a chamber or portable device and then disconnect the fill line. The internal half of the assembly contains a valve preventing flow from escaping. ![]() They are generally limited to applications involving low pressure air or other non-hazardous gases because the fluid is not contained in either half of the assembly upon disconnection. Quick disconnects without shut-offs are often used when high flow rates are required. Snap type quick disconnects are commonly specified with no shut-off, a single shut-off, double shut-off, or as a dry break: NO SHUT-OFF Often these fittings are equipped with self-sealing valves so that upon disconnection they will automatically contain the fluid in at least one of the lines. Many types of quick disconnects can be supplied as non-latching so inquire with the manufacturer. Test trays, animal cages, and umbilical lines are examples of applications that benefit from non-latching quick disconnects. Typically, a non-latching quick disconnect will be selected when a portion of the device requires frequent change out, when the releasing sleeve may be inaccessible, or when the customer wishes to integrate the quick disconnect directly into a mounting plate of their own design. Non-latching quick disconnects are used in applications where quick serviceability in a compact envelope is required. These QDCs can handle pressures up to approximately 500 psig. Also, they can be disconnected one handed. This quick release feature is advantageous in designs that require numerous connections throughout the life cycle of the product because they are so simple to operate. When the releasing sleeve (knurled for easy handling) is pulled back, the internal end and external ends quickly disengage from each other. They are designed with a spring loaded ball latching mechanism which automatically locks the two halves of the fitting together when they are pushed together. Snap type (ball latching) quick disconnects are the most common style. Snap style quick disconnects are the most common design available from Beswick SNAP TYPE (ball latching) Available materials are brass, electroless nickel plated brass, 303 and 316 stainless steels for metallic components and Buna-N, EPDM, Viton®, silicone and Perfluoroelastomers (such as Chemraz® and Kalrez®) for elastomers. In addition, many of these styles are available in single and double shutoff, non-shutoff and dry break sealing. Beswick quick disconnects are available in ball latching (also known as snap type), bayonet, threaded and non-latching connection styles. Other important questions to ask prior to specifying a quick disconnect are: Does the fitting need to operate with the use of only one hand? Do you need a shut-off mechanism in either or both ends of the connector? Or is no shut off mechanism(s) preferred to maximize flow capacity when connected? Is “dry breaking” (discussed later in this tutorial) required? Is a non-latching disconnect required? Are there multiple fluid lines that require simultaneous connection/disconnection? Will the disconnect have to operate under vacuum? What type of tubing or hose will be connected to the quick disconnect?īeswick offers a wide range of quick disconnects to meet many challenging applications. ![]() The same goes for temperature compatibility. All materials of construction must be compatible with the working fluid. Quick disconnects can also have pressure limitations so be sure the specified fitting can handle the maximum service pressures in the application. Designers should confirm that the fitting can deliver the flow performance required by their design. Since these fittings have a number of components in the waterway (fluid path), they often have higher pressure drop than simpler fittings. ![]() To ensure success, many design considerations need to be taken into account before specifying a quick disconnect. ![]()
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