Fisher MR98 Series

Product Benefits

  • Versatility
  • Differential Pressure Capability
  • Special Service Capabilities
  • Large Turndown Ratio
  • Graphite Gaskets
  • Set Pressures to 400 psig / 27.6 bar
  • Tight Shutoff with Elastomer Seats
  • Easy Maintenance

Technical Data

Available Backpressure Constructions

MR98L: 2 to 38 PSIG / 0.14 to 2.6 bar set pressure range
MR98H: 15 to 200 PSIG / 1.0 to 13.8 bar set pressure range
MR98HH: 150 to 375 PSIG / 10.3 to 25.9 bar set pressure range

Available Pressure Differential Constructions

MR98LD: 2 to 38 psi / 0.14 to 2.6 bar set pressure range; max differential 150 psi / 10.3 bar
MR98HD: 15 to 200 psi / 1.0 to 13.8 bar set pressure range; max differential 300 psi / 20.7 bar

Available High-Pressure Differential Constructions

MR98HDP: 15 to 200 psi / 1.0 to 13.8 bar set pressure range; max differential 600 psi / 41.4 bar
MR98HHD: 150 to 375 psi / 10.3 to 25.9 bar set pressure range; max differential 400 psi / 27.6 bar

Body and Spring Case Materials

Gray Cast Iron
WCC Steel
LCC Steel
Stainless Steel
Special Alloys: Monel®, Hastelloy® C, Aluminium-Bronze

Body Size and End Connection Styles

1/4-inch
1/2-inch / DN 15
3/4 and 1-inch / DN 20 and 25
1-1/2 and 2-inch / DN 40 and 50 (not available for Types MR95L and MR95LD)

End Connection Styles

NPT, SWE, and Welded and Integral CL150 RF, CL300 RF, CL600 RF, and PN 16/25/40 RF; all with 14-inch face-to-face (EN flanged-356 mm face-to-face)

Maximum Inlet Pressure

600 PSIG / 41.4 bar

Maximum Outlet Pressure

400 PSIG / 27.6 bar

Pressure Registration

Internal or External

MR98H Series Approximate Weights

1/4 NPT body: 5 lb / 2.3 kg
1/2-in / DN 15 body: 10 lb / 4.5 kg
3/4 and 1-in / DN 20 and 25 bodies: 22 lb / 10 kg
1-1/2 and 2-in bodies / DN 40 and 50: 55 lb / 25 kg

MR98L Series Approximate Weights

1/4 NPT body: 7 lb / 3.2 kg
1/2-in / DN 15 body: 15 lb / 6.8 kg
3/4 and 1-in / DN 20 and 25 bodies: 35 lb / 16 kg

Application

Typical applications include control and maintenance of backpressure on pumps, the differential pressure across lubricated seals, steam header pressure, fuel and oil lines pressure, air supply systems pressure, pump bypass applications for API general and special purpose lube and seal oil systems, relief applications for flash tanks and accumulators and other process and industrial uses.

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