These are used originally for connecting portable air tools and equipments to compressed air lines. However, now they are used on many other applications. These hydraulic Check Valve couplings are usually built to withstand operating pressure upto 300 PSI. Where non compressible fluids such as water, oil and grease are being used, this pressure may sometimes be exceeded safely. The hydraulic check valve coupling body should be installed on the upstream (Supply) end of the line to shut off the fluid supply, when hydraulic Check Valve coupling is disconnected. The Adaptor has no valving and upon disconnection, exhaust, upon downstream media.

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