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.
Key Features
- Versatility
- Differential Pressure Capability
- Special Service Capabilities
- Large Turndown Ratio
- Graphite Gaskets
- Set Pressures to 400 psig / 27.6 bar
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Specifications
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)
