Fisher MR98

Fisher MR98

Fisher™ MR98 Series is used for backpressure or relief applications in liquid, gas, air, and steam service. The Types MR98L, MR98H, and MR98HH are direct-operated and spring-loaded. The Types MR98LD, MR98HD, and MR98HHD use additional pressure loading to maintain relief differential pressures, backpressures or for remote setpoint adjustment.

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, Aluminum-Bronze
Contact Sales Office for Special Alloys
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
  • 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

Questions about the product?

Fill out the form below and we vill contact you with answers to your qusestions