HART Flat-Faced O-Ring Unions allow our customers to slip the "component" in and out of the assembly without disturbing the surrounding tube or rigid pipe sections........ saving downtime and labor!
Customer Benefit: Pipe alignment is much easier with HART O-Ring Unions by eliminating the necessity to spring the line during installation or disassembly!
Female Threaded Unions
Male Threaded Unions
Dielectric Unions
Socketweld Unions
The most popular union in the industry for general purpose joining of piping systems.
Full flow-waterway bore. Wrench flats both ends. Flat faced design.
HART O-Ring Unions are used where piping requirements dictate the necessity of having a flat face seal to make and break the pipe line. They meet requirements where an O-Ring, zero leakage, seal is recommended.
Turbulence-free fit across seats. Full bore I.D. - Full Flow.
O-Ring is located in the threadpiece face, well out of the waterway bore providing added protection against abrasives and erosion.
Combination end connections. Threaded, socketweld and buttweld ends are all interchangeable, as well as one-step line size changes.
Resistance to vibration. Seals will not loosen, even under extreme vibration or pressure surges.
No maintenance needed because once the seal is made, it never requires retightening.
Saves money and weight by eliminating unnecessary nipples, bushings, couplings and inserts when initially built into the system.
Fail-Safe Leakproof Reliability
At any pressure HART O-Rings actually strengthen the seal rather than loosen it.
The O-Ring is fitted into a machined groove between the two halves of the union. When the halves are drawn together, the O-Ring compresses to an ovalized cross-section, forming a positive, resilient seal which serves to block the fluid, thus sealing even at low or no pressure.
Static
As pressure is increased, the O-Ring is forced to flow and is squeezed into the downstream side causing the O-Ring to conform to the shape of the end, blocking the groove gap. The more the system pressure increases, the more effective the seal.
Under Load
The flat-faced construction allows for slipping the component in and out without disturbing the surrounding tube or pipe sections. Pipe alignment is much easier with HART Unions since it is unnecessary to spring the line during make-up or disassembly.
