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Home | Regulators | 98 Series Relief Valve or Backpressure Regulator

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98 Series Relief Valve or Backpressure Regulator

98 Series Relief Valve or Backpressure Regulator The 98 Series is used for backpressure or relief applications in liquid, gas, air, and steam service. The Types 98L, 98H, and 98HH are direct-operated and spring-loaded. The Types 98LD and 98HD use additional pressure loading to maintain relief differential pressures, backpressures or for remote setpoint adjustment.

The Type 98HM is a direct-operated, spring to close regulator for backpressure or relief applications in liquid, gas, or steam service. The regulator requires no external power to operate and features a sensing line connection for sensing pressure externally from the regulator. A seal washer for the set screw can be included when applications require pressure loading of the spring case (not available on NPS 1-1/2 and 2 bodies (DN 40 and 50)).

Features
  • Versatility
  • Excellent Fluid Compatibility
  • Close, Stable Regulation
  • Compact Design
  • Differential Pressure Capability
  • Handwheels
  • Sour Gas Service Capability
Body Sizes and End Connection Styles
  • Types 98H and 98HD
    • Cast Iron
      • 1/4, 1/2, 3/4, 1, 1-1/2, and 2 NPT
    • WCC Steel, CF8M Stainless steel, Hastelloy® C, Monel®
      • 1/4 through 2 NPT
      • NPS 1/2 through 2 SWE, CL150 RF, CL300 RF, PN 16/25/40 RF
  • Types 98L and 98LD
    • Cast Iron
      • 1/4, 1/2, 3/4, and 1 NPT
    • WCC Steel, CF8M Stainless steel, Hastelloy® C, Monel®
      • 1/4 through 1 NPT, NPS 1/2 through 1 SWE, CL150 RF, CL300 RF, PN16/25/40 RF
  • Type 98HM
    • WCC Steel, CF8M Stainless steel, Hastelloy® C, Monel®
      • 1/2, 3/4, 1, 1-1/2, and 2 NPT
  • Types 98HH and 98HHD
    • Cast Iron
      • 1/4, 1/2, 3/4, and 1 NPT
    • WCC Steel, CF8M Stainless steel, Hastelloy® C, Monel®
      • 1/4, 1/2, 3/4, and 1 NPT
Maximum Relief (Inlet) Pressures
  • Type 98H: 300 psig (20,7 bar)
  • Type 98HD: 400 psig (27,6 bar)
  • Type 98L: 125 psig (8,6 bar)
  • Type 98LD: 150 psig (10,3 bar)
  • Type 98HM: 300 psig (20,7 bar)
  • Types 98HH and 98HHD: 400 psig (27,6 bar)
Relief Set or Differential Pressure Ranges
  • Type 98H, 98HD, or 98HM: 15 to 275 psig (1,0 to 19,0 bar)
  • Type 98HH or 98HHD: 150 to 375 psig (10,3 to 25,9 bar)
  • Type 98L or 98LD: 2 to 38 psig (0,14 to 2,6 bar)
Temperature Capabilities
  • Nitrile Parts: -40° to 180°F (-40° to 82°C)
  • Neoprene Parts: -40° to 180°F (-40° to 82°C)
  • Fluorocarbon Parts: 0° to 300°F (-18° to 149°C)
  • Limited to 200°F (93°C) for hot water
  • Ethylenepropylene: -40° to 275°F (-40° to 135°C)
  • Perfluoroelastomer: 0° to 425°F (-18° to 218°C)
  • Perfluoroelastomer Diaphragm protector: -40° to 400°F (-40° to 207°C)
  • Metal Diaphragm Seat:
    • Cast Iron Body and Spring Case: -40° to 406°F (-40° to 207°C)
    • WCC Steel Body and Spring Case: -20° to 450°F (-29° to 232°C)
    • CF8M Stainless Steel Body Monel®, or Hastelloy® C, and Spring Case: -40° to 450°F (-40° to 232°C)
Approximate Weights
  • Type 98H:
    • NPS 1/4: 7 Pounds (4 kg)
    • NPS 1/2 (DN 15): 7 Pounds (4 kg)
    • NPS 3/4 (DN 20): 16 Pounds (7 kg)
    • NPS 1 (DN 25): 16 Pounds (7 kg)
    • NPS 1-1/2 (DN 40): 55 Pounds (25 kg)
    • NPS 2 (DN 50): 55 Pounds (25 kg)
  • Type 98L
    • NPS 1/4: 6 Pounds (3 kg)
    • NPS 1/2 (DN 15): 13 Pounds (6 kg)
    • NPS 3/4 (DN 20): 30 Pounds (14 kg)
    • NPS 1 (DN 25): 30 Pounds (14 kg)
  • Type 98HM
    • NPS 1/2 (DN 15): 8 Pounds (4 kg)
    • NPS 3/4 or 1 (DN 20 or 25): 20 Pounds (9 kg)
    • NPS 1-1/2 or 2 (DN 40 or 50): 73 Pounds (33 kg)



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