Mark 74 Series – Bellows Seal
The Mark 74 provides long-term, leak-free performance when fugitive emissions are a primary concern. The Mark 74 offers exceptional bellows life with a valve stroke that is just a fraction of that of other rising stem valves. This means Jordan Valve can use a smaller formed bellows that has minimal movement during operation.
The Mark 74 controls fugitive emissions while reducing the risks associated with toxic, corrosive, explosive, and high temperature fluids.
Long bellows life—In lab tests the Mark 74 exceeded 2 million cycles with no bellows failure
Short stroke—Valve stroke is just a fraction of other rising stem valves allowing for minimal movement during operation
Fully packed back-up seal for additional assurance. A secondary chamber of multiple packing rings provides extra leakage protection
Detection/monitoring port—A gauge can be mounted to verify bellows performance