Our dielectric insulated O-ring unions for these sectors create a reliable flow point with a seal that won’t break down, even during high-pressure applications or after constant exposure to corrosive petroleum and natural gasses.

HART produces all of our carbon steel unions in the U.S. to guarantee quality materials and construction, and reliable final parts in the face of vibration, turbulence, corrosive substrates, high pressures, and more. We use precision machining and assembly techniques so every union is a perfect fit.

HART Industrial Dielectric Insulated O-Ring Unions are the perfect solution for natural gas, oil-field, transmission pipeline, and refinery applications. The domestic made Class 3000, 6000, and 10000 unions are engineered to provide the most effective and efficient method of preventing electrolytic deterioration. The Union design provides insulation against galvanic corrosion and also breaks current flow eliminating any stray corrosion.

The thermo-baked epoxy polymer coating provides >600 volts/mil dielectric resistance under extreme conditions. Unions can be provided with any connection type on the threadpiece side (welded, sweat, threaded, etc) and can be made to transition between different piping sizes!