Widest selection in the oilfield
FMC offers the most complete line of
standard service and sour gas wing unions
with sizes ranging from 1- to 12-inches in
diameter with working pressures up to 20,000
psi. Unions are available with line pipe or
tubing threads, butt-weld, or nonpressurethread
seal end connections.
Positive sealing designs
Weco wing union seals vary according to
pressure and application. All wing unions
provide positive, pressure-tight sealing.
For low-pressure services (1,000 to 2,000
psi), the spherical surface of the male sub and
the conical surface of the female sub form a
metal-to-metal seal. This ball-and-cone seal
remains leak-proof even when one surface is
slightly pitted or misaligned.
Most medium-pressure models (2,000 to
4,000 psi) supplement the metal-to-metal seal
with a resilient O-ring in the male sub.