| 摘要 |
A check valve insert for installation between the inlet and outlet ports of a conventional "T" pipe coupling. The insert comprises a coupler for insertion into the coupling inlet port, a guide sleeve affixed to the coupler to project into the conduit, and a check ball positioned within the guide sleeve. The coupler includes a valve seat against which the check ball may rest to prevent fluid passage from the coupling outlet port to its inlet port. A plurality of apertures are spaced around the upper end of the guide sleeve above the coupling outlet port. Fluid outside the conduit which rises above the check ball enters the coupling inlet port and eventually lifts the ball away from the valve seat. The fluid passes up into the guide sleeve to flow through the apertures and exit via the coupling outlet port. Sufficient clearance is provided between the check ball and the guide sleeve to prevent lodging therebetween of foreign particulate matter which might jam the check ball. The components of the insert are designed to inhibit accumulation of foreign particulate matter which might interfere with movement of the check ball or sealing engagement thereof with the valve seat. The insert is also fashioned to facilitate cleaning without requiring removal of the insert from the coupling.
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