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Sch 80 PVC Unions


Schedule 80 PVC unions are used to connect two pressurized or corrosive liquid lines that can be easily separated and replaced or rejoined. Threaded couplings are similar, but unions accomplish this task rapidly and with very limited pipe motion.
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The body of a PVC union consists of two halves. One end of each half is attached to the piping, either permanently or with a reversible connection, and then the opposing halves of the union are abutted. One half of the union features male threading, and the other half has a nut. When the nut is screwed onto the threads, the two halves of the union are drawn together for a tight seal. The union design allows a split line to be connected and disconnected quickly with very limited play required in the line.

Schedule 80 PVC unions are always installed with liquid flow entering through the nut side. The bore of the union body is the same as, or even slightly larger than, the internal diameter of the joined pipe. This allows flow to continue through the fitting unimpeded and with no increase in pressure.

Schedule 80 fittings are thicker-walled than Schedule 40 fittings, and they are primarily designed for use with liquids under higher pressures. They have also found use in chemical processing applications due to PVC’s resistance to many industrial acids and bases.

These unions are available in standard pipe sizes and feature slip or spigot sockets, threaded MPT sockets, threaded FPT sockets, flanged ends, or any combination of these connection types.