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MR98 Series



This section lists the specications for the MR98 Series regulators. Factory specication such as type, maximum

inlet pressure, maximum temperature, maximum outlet pressure, spring range, orice 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 2.6 bar set pressure range

Type MR98H: Direct-operated high pressure

backpressure regulator/relief valve with 5 to

200 psig / 0.34 to 13.8 bar set pressure range

Type MR98HH: Direct-operated high pressure

backpressure/relief valve with 150 to 375 psig /

10.3 to 25.9 bar set pressure range

Type MR98LD: Pressure-loaded low pressure

differential pressure relief valve with 2 to 38 psi /

0.14 to 2.6 bar set pressure range

Type MR98HD: Pressure-loaded high pressure

differential pressure relief valve with 5 to 200 psi /

0.34 to 13.8 bar set pressure range

Type MR98HHD: Pressure-operated high

pressure backpressure/relief valve with 150

to 375 psi / 10.3 to 25.9 bar differential set

pressure range



1/4 NPT: 0.284 in. / 7.22 mm

1/2 in. / DN 15: 0.416 in. / 10.56 mm

3/4 and 1 in. / DN 20 and 25:

0.631 in. / 16.02 mm

1-1/2 and 2 in. / DN 40 and 50:

1.142 in. / 29 mm

Maximum Spring Case Loading Pressure for

Types MR98LD, MR98HD and MR98HHD

(Spring Setting Plus Loading Pressure)

(1)(2)

Type MR98LD Spring Case

Gray Cast Iron: 50 psig / 3.4 bar

Steel or Stainless steel: 125 psig / 8.6 bar

Type MR98HD Spring Case

Gray Cast Iron: 250 psig / 17.2 bar

Steel or Stainless steel: 300 psig / 20.7 bar

Type MR98HHD Spring Case

Steel or Stainless steel: 300 psig / 20.7 bar

Maximum Inlet and Outlet Pressure Rating

See Table 4



See Tables 1 and 2



and Materials

(1)(2)

See Table 4



BODY SIZE

In. DN

1/4 NPT - - - - 1.4 48 34.3

1/2 15 3.4 120 35.3

3/4 and 1 20 and 25 6.5 250 38.5

1-1/2 and 2 40 and 50 20.0 780 39.0



BODY SIZE

In. DN

1/4 NPT - - - - 0.743 0.74 0.95 0.90

1/2 15 0.787 0.78 0.94 0.88

3/4 and 1 20 and 25 0.935 0.70 0.91 0.83

1-1/2 and 2 40 and 50 0.961 0.69 0.94 0.88

Set Pressure Ranges

See Table 3

Pressure Registration

Internal or External



Metal Seats: Class IV

 Class IV

Elastomer Seats: Class VI or better

Temperature Capabilities for Elastomer Parts

(1)(3)

See Table 5

Temperature Capabilities for Metal Parts

(1)(3)

See Table 5

Approximate Weights

MR98H Series:

1/4 NPT: 5 lbs / 2.3 kg

1/2 in. / DN 15: 10 lbs / 4.5 kg

3/4 and 1 in. / DN 20 and 25: 22 lbs / 10 kg

1-1/2 and 2 in. / DN 40 and 50: 55 lbs / 25 kg

MR98L Series:

1/4 NPT: 7 lbs / 3.2 kg

1/2 in. / DN 15: 15 lbs / 6.8 kg

3/4 and 1 in. / DN 20 and 25: 35 lbs / 16 kg

1. The pressure/temperature limits in this Instruction Manual and any applicable standard limitation should not be exceeded.

2. Temperature and/or the body end connection may decrease these maximum pressures.

3. Pressure and/or the body end connection may decrease these maximum temperatures.

1 2 3 4 5 6 7 ... 35 36

MR98 Series 1

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