Data Sheet

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Bulletin 71.4:MR98

January 2015

D103743X012

www.fisherregulators.com

Figure 1. Typical MR98 Series Backpressure Regulators, Relief and Differential Relief Valves

P1757

TYPE MR98L

MR98 Series Backpressure Regulators, Relief

and Differential Relief Valves

TYPE MR98H

P1753

Summary of content (40 pages)

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Bulletin 71.4:MR98 January 2015 MR98 Series Backpressure Regulators, Relief and Differential Relief Valves P1753 TyPE MR98H P1757 TyPE MR98L D103743X012 Figure 1. Typical MR98 Series Backpressure Regulators, Relief and Differential Relief Valves www.fisherregulators.
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Bulletin 71.4:MR98 Specifications This section lists the specifications for the MR98 Series regulators. Factory specification such as type, maximum inlet pressure, maximum temperature, maximum outlet pressure, spring range, orifice size and seat material are stamped on the nameplate fastened on the regulator at the factory. Available Constructions Type MR98L: Direct-operated low pressure backpressure regulator/relief valve with 2 to 38 psig / 0.14 to 2.
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Bulletin 71.4:MR98 Specifications (continued) IEC Sizing Coefficients Body size In. Dn 1/4 NPT ---1/2 15 3/4 and 1 20 and 25 1-1/2 and 2 40 and 50 Approximate Weights Xt Fd fl Km 0.743 0.787 0.935 0.961 0.74 0.78 0.70 0.69 0.95 0.94 0.91 0.94 0.90 0.88 0.83 0.
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Bulletin 71.4:MR98 Table 1. Types MR98L and MR98LD Regulators Body Constructions Without Control Line and Gauge Port NPT NPT SWE Without Control Line and Gauge Port 1/2 in. / DN 15 Welded CL150 RF Welded CL300 RF Welded PN 16/25/40 RF With Control Line but Without Gauge Port NPT NPT SWE Without Control Line and Gauge Port Welded CL150 RF Welded CL300 RF 3/4 in.
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Bulletin 71.4:MR98 Table 2. Types MR98H, MR98HD, MR98HH and MR98HHD Regulators Body Constructions Aluminum-Bronze Monel® or Hastelloy® C(1) Without Control Line and Gauge Port CF3M Stainless Steel(1) 1/4 in. End Connection STYLE CF8M Stainless Steel(1) BODY Construction WCC or LCC Steel Body Size Gray Cast Iron(2) Body Material NPT NPT SWE Welded CL150 RF Without Control Line and Gauge Port Welded CL300 RF Welded PN 16/25/40 RF 1/2 in.
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Bulletin 71.4:MR98 Table 2. Types MR98H, MR98HD, MR98HH and MR98HHD Regulators Body Constructions (continued) NPT SWE Without Control Line and Gauge Port Welded CL150 RF Welded CL300 RF Welded PN 16/25/40 RF 1-1/2 in.
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Bulletin 71.4:MR98 Table 3. MR98 Series Body Sizes, Pressure Ranges and Spring Information TYPE BODY SIZE In. 1/4 1/2 DN ---- 15 MR98L and MR98LD 3/4 and 1 3/4 and 1 1/4 1/2 MR98H and MR98HD 3/4 and 1 3/4 and 1 MR98HH and MR98HHD 20 and 25 20 and 25 ---- 15 20 and 25 20 and 25 CONTROL PRESSURE RANGE(1) SPRING WIRE DIAMETER SPRING FREE LENGTH psig bar In. mm In. mm SPRING MATERIAL SPRING PART NUMBER SPRING COLOR 2 to 7 0.14 to 0.48 0.148 3.76 2.00 50.
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Bulletin 71.4:MR98 Adjusting screw Control spring Vent Diaphragm Valve plug Orifice CONTROL LINE TAP TYPE MR98H WITH INTERNAL PRESSURE REGISTRATION BACK VIEW OF 1/2 In. / DN 15 TYPE MR98H WITH EXTERNAL PRESSURE REGISTRATION ERSA02737 INLET PRESSURE OUTLET PRESSURE ATMOSPHERIC PRESSURE SIDE AND INTERNAL VIEW OF 3/4 TO 2 In. / DN 20 TO 50 TYPE MR98H WITH EXTERNAL PRESSURE REGISTRATION (ALSO TYPICAL OF TYPE MR98L, 1/2 TO 2 In.
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Bulletin 71.4:MR98 Handwheel Control spring Loading pressure inlet tap Diaphragm Valve plug ORIFICE CONTROL LINE TAP INLET PRESSURE OUTLET PRESSURE LOADING PRESSURE TYPE MR98HD WITH INTERNAL PRESSURE REGISTRATION TYPE MR98HD WITH EXTERNAL PRESSURE REGISTRATION Spring Metal diaphragms GASKET For types MR98HD, MR98HHD and MR98LD with metal diaphragms, assemble diaphragm gaskets under and above the metal diaphragms as shown above Figure 2.
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Bulletin 71.4:MR98 Typical relieving capacities in lbs per hour and kilogram per hour of saturated steam are shown in Tables 9, 14 and 19. Equation 2: QSCFH = Tables 7, 8, 12, 13, 17 and 18 give relieving capacities in U.S. gallons per minute and in liters per minute of water. 520 GT CgP1aSIN ) 3417 C1 ∆P P1a ) DEG Liquid Sizing for Liquids Other than Water Sizing Determine Flow Rates for units used as differential relief valves as follows: Step 1.
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Bulletin 71.4:MR98 Table 4.
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Bulletin 71.4:MR98 Table 6.
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Bulletin 71.4:MR98 Table 7. Water Relief Capacities in Gallons per Minute / L/min, Types MR98L and MR98LD with Elastomer Diaphragm (continued) NOMINAL BODY SIZE, In. / DN 1/4 NPT SPRING RELIEF PRESSURE RANGE psi 2 to 7 0.14 to 0.48 Yellow 6 to 14 0.41 to 0.97 Green 12 to 25 20 to 38 1/2 / 15 0.83 to 1.7 1.4 to 2.6 Red Blue 2 to 7 0.14 to 0.48 Yellow 6 to 14 0.41 to 0.97 Green 12 to 25 0.83 to 1.7 Red 20 to 38 3/4 and 1 / 20 and 25 bar COLOR CODE 1.4 to 2.6 Blue 2 to 7 0.
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Bulletin 71.4:MR98 Table 8. Water Relief Capacities in Gallons per Minute / L/min, Types MR98L and MR98LD with Metal Diaphragm NOMINAL BODY SIZE, In. / DN 1/4 NPT SPRING RELIEF PRESSURE RANGE psi 0.14 to 0.48 Yellow 6 to 14 0.41 to 0.97 Green 12 to 25 0.83 to 1.7 1.4 to 2.6 Red Blue 2 to 7 0.14 to 0.48 Yellow 6 to 14 0.41 to 0.97 Green 12 to 25 20 to 38 3/4 and 1 / 20 and 25 bar 2 to 7 20 to 38 1/2 / 15 COLOR CODE 0.83 to 1.7 1.4 to 2.6 Red Blue 2 to 7 0.14 to 0.
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Bulletin 71.4:MR98 Table 8. Water Relief Capacities in Gallons per Minute / L/min, Types MR98L and MR98LD with Metal Diaphragm (continued) NOMINAL BODY SIZE, In. / DN 1/4 NPT SPRING RELIEF PRESSURE RANGE psi 0.14 to 0.48 Yellow 6 to 14 0.41 to 0.97 Green 12 to 25 0.83 to 1.7 1.4 to 2.6 Red Blue 2 to 7 0.14 to 0.48 Yellow 6 to 14 0.41 to 0.97 Green 12 to 25 20 to 38 3/4 and 1 / 20 and 25 bar 2 to 7 20 to 38 1/2 / 15 COLOR CODE 0.83 to 1.7 1.4 to 2.6 Red Blue 2 to 7 0.14 to 0.
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Bulletin 71.4:MR98 Table 9. Steam Relief Capacities in Lbs per Hour / kg/h, Types MR98L and MR98LD with Metal Diaphragm Only NOMINAL BODY SIZE, In. / DN 1/4 NPT SPRING RELIEF PRESSURE RANGE psi 0.14 to 0.48 Yellow 6 to 14 0.41 to 0.97 Green 12 to 25 0.83 to 1.7 1.4 to 2.6 Red Blue 2 to 7 0.14 to 0.48 Yellow 6 to 14 0.41 to 0.97 Green 12 to 25 20 to 38 3/4 and 1 / 20 and 25 bar 2 to 7 20 to 38 1/2 / 15 COLOR CODE 0.83 to 1.7 1.4 to 2.6 Red Blue 2 to 7 0.14 to 0.
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Bulletin 71.4:MR98 Table 9. Steam Relief Capacities in Lbs per Hour / kg/h, Types MR98L and MR98LD with Metal Diaphragm Only (continued) NOMINAL BODY SIZE, In. / DN 1/4 NPT SPRING RELIEF PRESSURE RANGE psi 0.14 to 0.48 Yellow 6 to 14 0.41 to 0.97 Green 12 to 25 0.83 to 1.7 1.4 to 2.6 Red Blue 2 to 7 0.14 to 0.48 Yellow 6 to 14 0.41 to 0.97 Green 12 to 25 0.83 to 1.7 Red 20 to 38 3/4 and 1 / 20 and 25 bar 2 to 7 20 to 38 1/2 / 15 COLOR CODE 1.4 to 2.6 Blue 2 to 7 0.14 to 0.
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Bulletin 71.4:MR98 Table 10. Air Relief Capacities in Scfh / Nm3/h, Types MR98L and MR98LD with Elastomer Diaphragm NOMINAL BODY SIZE, In. / DN 1/4 NPT SPRING RELIEF PRESSURE RANGE psi PRESSURE BUILD-UP OVER RELIEF SETTING, psig / bar 2 / 0.14 4 / 0.28 8 / 0.55 10 / 0.69 bar scfh Nm3/h scfh Nm3/h scfh Nm3/h scfh Nm3/h scfh Nm3/h 2 0.14 720 19.4 880 23.5 1000 27.5 1100 30.7 1300 34 Yellow 5 0.34 890 24 1000 27.9 1200 31.7 1300 34.9 1400 38.1 6 to 14 0.41 to 0.
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Bulletin 71.4:MR98 Table 10. Air Relief Capacities in Scfh / Nm3/h, Types MR98L and MR98LD with Elastomer Diaphragm (continued) NOMINAL BODY SIZE, In. / DN 1/4 NPT SPRING RELIEF PRESSURE RANGE psi bar 2 to 7 0.14 to 0.48 Yellow 6 to 14 0.41 to 0.97 Green 12 to 25 0.83 to 1.7 Red 20 to 38 1/2 / 15 1.4 to 2.6 Blue PRESSURE BUILD-UP OVER RELIEF SETTING, psig / bar RELIEF PRESSURE SETTING 15 / 1.0 20 / 1.4 25 / 1.7 psig bar scfh Nm /h scfh Nm /h scfh 2 0.14 1500 41.2 1800 48.
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Bulletin 71.4:MR98 Table 11. Air Relief Capacities in Scfh / Nm3/h, Types MR98L and MR98LD with Metal Diaphragm NOMINAL BODY SIZE, In. / DN 1/4 NPT SPRING RELIEF PRESSURE RANGE psi bar 2 to 7 0.14 to 0.48 Yellow 6 to 14 0.41 to 0.97 Green 12 to 25 20 to 38 1/2 / 15 0.83 to 1.7 1.4 to 2.6 Red Blue 2 to 7 0.14 to 0.48 Yellow 6 to 14 0.41 to 0.97 Green 12 to 25 20 to 38 3/4 and 1 / 20 and 25 COLOR CODE 0.83 to 1.7 1.4 to 2.6 Red Blue 2 to 7 0.14 to 0.48 Yellow 6 to 14 0.
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Bulletin 71.4:MR98 Table 11. Air Relief Capacities in Scfh / Nm3/h, Types MR98L and MR98LD with Metal Diaphragm (continued) NOMINAL BODY SIZE, In. / DN 1/4 NPT SPRING RELIEF PRESSURE RANGE psi bar 2 to 7 0.14 to 0.48 Yellow 6 to 14 0.41 to 0.97 Green 12 to 25 20 to 38 1/2 / 15 0.83 to 1.7 1.4 to 2.6 Red Blue 2 to 7 0.14 to 0.48 Yellow 6 to 14 0.41 to 0.97 Green 12 to 25 20 to 38 3/4 and 1 / 20 and 25 COLOR CODE 0.83 to 1.7 1.4 to 2.
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Bulletin 71.4:MR98 Table 12. Water Relief Capacities in Gallons per Minute / L/min, Types MR98H and MR98HD with Elastomer Diaphragm NOMINAL BODY SIZE, In. / DN SPRING RELIEF PRESSURE RANGE psi 15 to 35 25 to 75 COLOR CODE bar 1.0 to 2.4 1.7 to 5.2 Yellow Green 1/4 NPT 70 to 140 130 to 200 15 to 35 25 to 75 4.8 to 9.7 9.0 to 13.8 1.0 to 2.4 1.7 to 5.2 Red Blue Yellow Green 1/2 / 15 70 to 140 130 to 200 15 to 35 25 to 75 4.8 to 9.7 9.0 to 13.8 1.0 to 2.4 1.7 to 5.
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Bulletin 71.4:MR98 Table 12. Water Relief Capacities in Gallons per Minute / L/min, Types MR98H and MR98HD with Elastomer Diaphragm (continued) NOMINAL BODY SIZE, In. / DN SPRING RELIEF PRESSURE RANGE psi 15 to 35 25 to 75 COLOR CODE bar 1.0 to 2.4 1.7 to 5.2 Yellow Green 1/4 NPT 70 to 140 130 to 200 15 to 35 25 to 75 4.8 to 9.7 9.0 to 13.8 1.0 to 2.4 1.7 to 5.2 Red Blue Yellow Green 1/2 / 15 70 to 140 130 to 200 15 to 35 25 to 75 4.8 to 9.7 9.0 to 13.8 1.0 to 2.4 1.7 to 5.
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Bulletin 71.4:MR98 Table 13. Water Relief Capacities in Gallons per Minute / L/min, Types MR98H and MR98HD with Metal Diaphragm NOMINAL BODY SIZE, In. / DN SPRING RELIEF PRESSURE RANGE psi 15 to 35 25 to 75 COLOR CODE bar 1.0 to 2.4 1.7 to 5.2 Yellow Green 1/4 NPT 70 to 140 130 to 200 15 to 35 25 to 75 4.8 to 9.7 9.0 to 13.8 1.0 to 2.4 1.7 to 5.2 Red Blue Yellow Green 1/2 / 15 70 to 140 130 to 200 15 to 35 25 to 75 4.8 to 9.7 9.0 to 13.8 1.0 to 2.4 1.7 to 5.
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Bulletin 71.4:MR98 Table 13. Water Relief Capacities in Gallons per Minute / L/min, Types MR98H and MR98HD with Metal Diaphragm (continued) NOMINAL BODY SIZE, In. / DN SPRING RELIEF PRESSURE RANGE psi 15 to 35 25 to 75 bar 1.0 to 2.4 1.7 to 5.2 COLOR CODE Yellow Green 1/4 NPT 70 to 140 130 to 200 15 to 35 25 to 75 4.8 to 9.7 9.0 to 13.8 1.0 to 2.4 1.7 to 5.2 Red Blue Yellow Green 1/2 / 15 70 to 140 130 to 200 15 to 35 25 to 75 4.8 to 9.7 9.0 to 13.8 1.0 to 2.4 1.7 to 5.
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Bulletin 71.4:MR98 Table 14. Steam Relief Capacities in Lbs per Hour / kg/h, Types MR98H and MR98HD with Metal Diaphragm Only NOMINAL BODY SIZE, In. / DN SPRING RELIEF PRESSURE RANGE psi 15 to 35 25 to 75 COLOR CODE bar 1.0 to 2.4 1.7 to 5.2 Yellow Green 1/4 NPT 70 to 140 130 to 200 15 to 35 25 to 75 4.8 to 9.7 9.0 to 13.8 1.0 to 2.4 1.7 to 5.2 Red Blue Yellow Green 1/2 / 15 70 to 140 130 to 200 15 to 35 25 to 75 4.8 to 9.7 9.0 to 13.8 1.0 to 2.4 1.7 to 5.
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Bulletin 71.4:MR98 Table 14. Steam Relief Capacities in Lbs per Hour / kg/h, Types MR98H and MR98HD with Metal Diaphragm Only (continued) NOMINAL BODY SIZE, In. / DN SPRING RELIEF PRESSURE RANGE psi 15 to 35 25 to 75 COLOR CODE bar 1.0 to 2.4 1.7 to 5.2 Yellow Green 1/4 NPT 70 to 140 130 to 200 15 to 35 25 to 75 4.8 to 9.7 9.0 to 13.8 1.0 to 2.4 1.7 to 5.2 Red Blue Yellow Green 1/2 / 15 70 to 140 130 to 200 15 to 35 25 to 75 4.8 to 9.7 9.0 to 13.8 1.0 to 2.4 1.7 to 5.
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Bulletin 71.4:MR98 Table 15. Air Relief Capacities in Scfh / Nm3/h, Types MR98H and MR98HD with Elastomer Diaphragm NOMINAL BODY SIZE, In. / DN SPRING RELIEF PRESSURE RANGE psi 15 to 35 25 to 75 COLOR CODE bar 1.0 to 2.4 1.7 to 5.2 Yellow Green 1/4 NPT 70 to 140 130 to 200 15 to 35 25 to 75 4.8 to 9.7 9.0 to 13.8 1.0 to 2.4 1.7 to 5.2 Red Blue Yellow Green 1/2 / 15 70 to 140 130 to 200 15 to 35 25 to 75 4.8 to 9.7 9.0 to 13.8 1.0 to 2.4 1.7 to 5.
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Bulletin 71.4:MR98 Table 15. Air Relief Capacities in Scfh / nm3/h, Types MR98H and MR98HD with Elastomer Diaphragm (continued) NOMINAL BODY SIZE, In. / DN SPRING RELIEF PRESSURE RANGE psi 15 to 35 25 to 75 bar 1.0 to 2.4 1.7 to 5.2 COLOR CODE Yellow Green 1/4 NPT 70 to 140 130 to 200 15 to 35 25 to 75 4.8 to 9.7 9.0 to 13.8 1.0 to 2.4 1.7 to 5.2 Red Blue Yellow Green 1/2 / 15 70 to 140 130 to 200 15 to 35 25 to 75 4.8 to 9.7 9.0 to 13.8 1.0 to 2.4 1.7 to 5.
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Bulletin 71.4:MR98 Table 16. Air Relief Capacities in Scfh / Nm3/h, Types MR98H and MR98HD with Metal Diaphragm NOMINAL BODY SIZE, In. / DN SPRING RELIEF PRESSURE RANGE psi 15 to 35 25 to 75 COLOR CODE bar 1.0 to 2.4 1.7 to 5.2 Yellow Green 1/4 NPT 70 to 140 4.8 to 9.7 130 to 200 9.0 to 13.8 15 to 35 25 to 75 1.0 to 2.4 1.7 to 5.2 Red Blue Yellow Green 1/2 / 15 70 to 140 4.8 to 9.7 130 to 200 9.0 to 13.8 15 to 35 25 to 75 1.0 to 2.4 1.7 to 5.
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Bulletin 71.4:MR98 Table 16. Air Relief Capacities in Scfh / Nm3/h, Types MR98H and MR98HD with Metal Diaphragm (continued) NOMINAL BODY SIZE, In. / DN SPRING RELIEF PRESSURE RANGE psi 15 to 35 25 to 75 bar 1.0 to 2.4 1.7 to 5.2 COLOR CODE Yellow Green 1/4 NPT 70 to 140 4.8 to 9.7 130 to 200 9.0 to 13.8 15 to 35 25 to 75 1.0 to 2.4 1.7 to 5.2 Red Blue Yellow Green 1/2 / 15 70 to 140 4.8 to 9.7 130 to 200 9.0 to 13.8 15 to 35 25 to 75 1.0 to 2.4 1.7 to 5.
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Bulletin 71.4:MR98 Table 17. Water Relief Capacities in Gallons per Minute / L/min, Types MR98HH and MR98HHD with Elastomer Diaphragm NOMINAL BODy SIzE, In. / DN 1/4 NPT 1/2 / 15 3/4 and 1 / 20 and 25 SPRING RELIEF PRESSURE RANGE psi 150 to 375 150 to 375 150 to 375 bar 10.3 to 25.9 10.3 to 25.9 10.3 to 25.9 PRESSURE BUILD-UP OVER RELIEF SETTING, psig / bar RELIEF PRESSURE SETTING 5 / 0.34 10 / 0.69 15 / 1.0 20 / 1.4 25 / 1.
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Bulletin 71.4:MR98 Table 18. Water Relief Capacities in Gallons per Minute / L/min, Types MR98HH and MR98HHD with Metal Diaphragm NOMINAL BODy SIzE, In. / DN 1/4 NPT 1/2 / 15 3/4 and 1 / 20 and 25 SPRING RELIEF PRESSURE RANGE psi 150 to 375 150 to 375 150 to 375 bar PRESSURE BUILD-UP OVER RELIEF SETTING, psig / bar RELIEF PRESSURE SETTING psig 10.3 to 25.9 5 / 0.34 bar GPM 10 / 0.69 l/min GPM 15 / 1.0 l/min 20 / 1.4 GPM l/min GPM 25 / 1.7 l/min GPM l/min 150 10.3 3.2 12.1 4.
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Bulletin 71.4:MR98 Table 19. Steam Relief Capacities in Lbs per Hour / kg/h, Types MR98HH and MR98HHD with Metal Diaphragm Only NOMINAL BODy SIzE, In. / DN 1/4 NPT 1/2 / 15 3/4 and 1 / 20 and 25 SPRING RELIEF PRESSURE RANGE psi 150 to 375 150 to 375 150 to 375 bar 10.3 to 25.9 10.3 to 25.9 10.3 to 25.9 PRESSURE BUILD-UP OVER RELIEF SETTING, psig / bar RELIEF PRESSURE SETTING 5 / 0.34 10 / 0.69 15 / 1.0 20 / 1.4 25 / 1.
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Bulletin 71.4:MR98 Table 20. Air Relief Capacities in SCfH / Nm3/h, Types MR98HH and MR98HHD with Elastomer Diaphragm NOMINAL BODy SIzE, In. / DN 1/4 NPT 1/2 / 15 3/4 and 1 / 20 and 25 SPRING RELIEF PRESSURE RANGE psi 150 to 375 150 to 375 150 to 375 bar 10.3 to 25.9 10.3 to 25.9 10.3 to 25.9 PRESSURE BUILD-UP OVER RELIEF SETTING, psig / bar RELIEF PRESSURE SETTING psig bar 5 / 0.34 10 / 0.69 Nm3/h SCFH SCFH 15 / 1.0 Nm3/h 20 / 1.4 SCFH Nm3/h SCFH 25 / 1.
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Bulletin 71.4:MR98 Table 21. Air Relief Capacities in SCfH / Nm3/h, Types MR98HH and MR98HHD with Metal Diaphragm NOMINAL BODy SIzE, In. / DN 1/4 NPT 1/2 / 15 3/4 and 1 / 20 and 25 SPRING RELIEF PRESSURE RANGE psi 150 to 375 150 to 375 150 to 375 bar PRESSURE BUILD-UP OVER RELIEF SETTING, psig / bar RELIEF PRESSURE SETTING 5 / 0.34 10 / 0.69 15 / 1.0 20 / 1.4 25 / 1.7 psig bar SCFH Nm3/h SCFH Nm3/h SCFH Nm3/h SCFH Nm3/h SCFH Nm3/h 150 10.3 1240 33.2 1750 46.9 2250 60.
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B B A A ERAA03807 B Bulletin 71.4:MR98 ERAA03809 A ERAA03807 TYPE MR98H (DIMENSIONS ALSO APPLY TO TYPES MR98L AND MR98HH) ERAA03809 TYPE MR98HD (DIMENSIONS ALSO TYPE MR98H (DIMENSIONS ALSO APPLY TO TYPES MR98LD AND MR98HHD) TO TYPES ØC MR98L AND MR98HH) D (MAX) ØJ 1/4 NPT* 1/4 NPT* D (MAX) D (MAX) 1/4 NPT* D (MAX) FLANGE TYPE MR98HD (DIMENSIO APPLY TO TYPES MR98LD A ØC ØC ØC A 1/4 NPT FLANGE NPT OR SWE NPT OR SWE B B B A B 14.00 / 355.6 ERAA03811 ERAA03807 14.00 / 355.
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1/4 NPT* D (MAX) 14.00 / ERAA03811 Bulletin 71.4:MR98 TYPE MR98H FLANGED BODIES A DN 15 TO 50 BODY SIZES (DIMENSIONS FLANGE ØC Ø ØJ 3.50 / 88.9 G B 14.00 / 355.6 D (MAX) ERAA03811 ERAA03812 ERAA03808 1/4TYPE MR98H FLANGED BODIES AVAILABLE IN 1/2 TO 2 IN. / HANDLE DETAIL FOR SIZE DNNPT 15 TO 50 BODY SIZES (DIMENSIONS ALSO APPLY TO TYPE MR98L) 1/2 IN. / DN 15 ONLY Ø 3.50 / 88.
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Bulletin 71.4:MR98 Ordering Guide (continued) Body Size (Select One)  1/4 NPT(1)  1/2 in. / DN 15  3/4 in. / DN 20  1 in. / DN 25  1-1/2 in. / DN 40 (not available for MR98L Series)  2 in.
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Bulletin 71.4:MR98 Ordering Guide (continued) Replacement Parts Kit (Optional)  Yes, send one replacement parts kit to match this order. Relief/Differential Relief Pressure Range (Select One) (continued) Type MR98H or MR98HD (continued) Steel (continued) 1-1/2 and 2 in. / DN 40 and 50 Bodies  5 to 35 psig/psi / 0.34 to 2.4 bar  20 to 65 psig/psi / 1.4 to 4.5 bar  50 to 100 psig/psi / 3.4 to 6.9 bar  75 to 170 psig/psi / 5.2 to 11.7 bar Stainless steel 3/4 and 1 in.