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-loaded high pressure backpressure/relief valve with 150 to 375 psi / 10.3 to 25.9 bar differential set pressure range