Three-way isolation valve
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Difference between T-type three-way shut-off valves and L-type three-way shut-off valves
The T-shaped structure enables three orthogonal pipes to be connected to each other while blocking the third channel, serving to divide and combine flows. The L-type can only connect two pipes that are orthogonal to each other; it cannot maintain connectivity with a third pipe at the same time, and it serves only as a distribution element.