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BHydraulics Introduction Hydraulic Quick Couplings Double Shut-Off and Straight-Thru Couplings Parker hydraulic couplings have a wide variety of designs, off valves.These valves open automatically when the body each tailored to a particular application or use.This catalog is and nipple are connected, and close automatically when the arranged according to those categories. In each section the two halves are disconnected--keeping fluid loss to a construction of a specific design will be detailed. However, minimum. based on the valving of the coupling, hydraulic couplings Parker Straight-Thru couplings have no valves in either half generally fall into one of two groups, either Double Shut-Off and are ideal for maximum flow application.Their smooth, or Straight-Thru. open bore offers the lowest pressure drop of any quick Double Shut-Off couplings are used extensively when it is disconnect coupling, and allows them to be thoroughly important to minimize fluid loss upon disconnection. Both cleaned. Since there are no valves in either half, fluid flow halves of the coupler, the body and the nipple, contain shut- should be shut off before the coupling is disconnected. Rated Pressure Rated pressure for the Parker hydraulic couplings range from even if the system's nominal pressure falls within the rated 30 to 15,000 psi, depending on the coupling series, size and pressure range of the coupling. materials. Rated pressures as shown in this catalog are For assistance in analyzing your application, contact your defined in the American National Standard Glossary of Terms nearest Parker sales office or the Quick Coupling Division for Fluid Power, ANSI/B93.2-1986, as "the qualified operating in Minneapolis. pressures which are recommended for a component or a system by the manufacturer." Parker "Rated Pressures" have Refer to the Safety Guide at the end of this catalog for been established on the basis of laboratory tests which considerations when selecting a Quick Coupling. include, but are not limited to, static burst tests and multiple Refer to the Fluid Compatibility Chart (note Table of Contents) cycle impulse tests. System characteristics such as high for seal selection assistance for both Double Shut-Off and cycling rates and high amplitude shocks either hydraulic or Straight-Thru couplings. mechanical, can reduce the functioning life of a coupling, Checklist for Selecting Quick Couplings What are the functional requirements of the coupling? Does the application require the ability to connect and disconnect under pressure? What is the maximum working pressure of the application? What is the media temperature and ambient temperature? Which seals and body material are compatible with the system's fluid? What end configurations are required? Is the application static or dynamic? Is an industry interchange coupler required? What size coupler is required? Is air inclusion and fluid loss a concern in the application? What is the maximum pressure drop suitable for the application? Quick Coupling Division 8145 Lewis Road � Minneapolis, MN 55427 B-2 www.parker.com/quickcouplings
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