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Premier Control Technologies

Flow, pressure, level and temperature solutions

Mark 56 and Mark 560 Series Air Loaded Back Pressure Regulator

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  • Air loaded back pressure regulator controlled via a local or remote station.
  • Straight through flow reduces wear and turbulence inside the valve.
  • Can be applied to use in chemicals, air, liquids and steam.

The Mark 56/560 series is an air loaded back pressure regulator that is operated by a static air line at the top of the diaphragm. This means that when combined with an extended range I/P converter it can be used remotely or manually controlled with a MK12 loading station.


A rangeability of 40:1 means that it can be used in a range of applications to include steam, liquids and chemicals. Cv ratings can go up to 395 depending on construction of the device.

Body, seat and trim materials

The body is constructed from ductile iron, bronze DN15-50, carbon steel, stainless steel and cast iron (DN65-150). Trim materials include 303SS for DI, CL, BRZ and CS bodies and 316 for the SS body. The seat can be either Jorcote or SST.

Diaphragm materials

A range of diaphragm materials are available including stainless steel as standard, Buna-nitrile, Viton and Jorcote all of which have a maximum temperature of 232°C apart from Buna-nitrile which is 93°C.

No gaskets or O-Rings are needed on devices under 2" (DN50) which reduces the maintenance costs as inside the regulator it is metal to metal contact. Sizes of the Mark 56 go from ½" up to 6" or DN15 through to DN150.

The sliding gate seats mean that the flow goes straight through the valve which means that less turbulence is experienced during operation which gives means less chattering and longer seat life. It also provides a tight shut off when the plate and disk overlap and is ANSI Class IV.

Key specifications

Sizes1/2" through 6" (DIN15 through DIN150)
End connections
  • Threaded - FNPT, BSPT, BSPP
  • ANSI Flanges - #150, #300
  • DIN Flanges - PN10/16, PN25/40
  • JIS Flanges - 10K, 20K
Body materials
  • Ductile Iron
  • Bronze
  • Carbon Steel
  • Stainless Steel
  • Cast Iron
Trim materials
  • 303SS for DI, CI, BRZ and CS body valves
  • 316 for SS body valves
  • Jorcote on SST - Standard
  • Jorcote/Jordanic on SST - for severe service
  • Chrome plated SST - Optional
Diaphragm materials
  • Stainless steel standard - (450°F - 650°F temperature limit depending on seat material)
  • Buna/Nitrile (200°F temp limit)
  • Viton (450°F temp limit)
  • Jorlon (450°F temp limit)
Diaphragm case
  • DI (1/2" to 2"/DN15 to DN50)
  • Steel (2"-1/2" to 6"/DN65 to DN150)
Dome loading pressurematches body pressure rating
Servicesteam, water, gas, oil, chemicals
ShutoffANSI Class IV

Full specifications and further information can be found by downloading the spec sheet here.

Model numbers

  • 56
  • 560


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