Mark 58G – In-Line Globe Back Pressure Regulator

The MK58G is a globe style back pressure regulator. The Mark 58G is available in sizes up to 2″ (DN50) in carbon steel or stainless steel. Diaphragms can be either Jorlon, Stainless Steel or Elastomer. Low flow versions with Cv values as low as 0.26 are available in certain sizes.


  • Easy to maintain and service – top entry access to plug and diaphragm
  • Large effective diaphragm area – reduces droop for increased accuracy and sensitivity
  • Large orifices and body passages – provides high flow capacities
  • “Tight Shutoff” – choice of ANSI CL VI bubble tight soft seat or ANSI CL IV hard seat
  • Versatile application – use on steam, air, gas liquids or chemicals