Product description
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.
Control valve MK74
Size
- 1/2" - 2" (DN15 -DN50)
End Connections
- Threaded (NPT, BSPT, BSPP)
- ANSI Flanges (150#, 300#)
- DIN Flanges (PN10/16, PN25/40)
Body Material
- Carbon Steel, Stainless Steel, Ductile Iron, Bronze
Seat Materials
- Jorcote on SST (standard)
Trim Material
- 303SS – standard for Ductile Iron, Bronze or Car-bon Steel valves
- 316SS – standard on Stainless Steel valves
Shutoff
- ANSI Class IV
Action
- Direct (air-to-close)
- Reverse (air-to-open)
Ranges
- controller-operated: 3-15, 3-9, 6-30, 9-15 psi (0,2-1,0; 0,2-0,6; 0,4-2,1; 0,6-1,0 bar)
Features and Benefits
- 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
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