The Fisher Type LR128 is a pilot operated pressure relief valve and backpressure regulator specifically designed for liquid service. It delivers smooth, consistent performance, tight shutoff, and extended service life. The valve features an internally actuated metal plug, avoiding the limitations of flexible element designs. Its engineered flow path helps deflect debris away from the seat, minimizing the risk of damage and erosion. Additionally, an internal inlet strainer prevents large particles from entering the main valve, enhancing overall reliability.
Features
• Debris Protection
• Thorough Laboratory Testing
• In-Service Travel Indicator
• Easily Maintained Pilot
Specifications
The specifications for the Fisher™ Type LR128 relief valve or backpressure regulator are listed below. Additional details related to the main valve can be found on its nameplate. The control spring range for the MR98H pilot, which is used with the LR128, is also indicated on the pilot’s nameplate.
Pressure Registration
• External
Temperature Capabilities
• 17E68 Nitrile (NBR):?-20 to 150°F / -29 to 66°C | 17E97 Nitrile (NBR): 0 to 150°F / -18 to 66°C | 17E88 Fluorocarbon (FKM): 0 to 250°F / -18 to 121°C
Body Sizes
• NPS 1 / 2 / 3 / 4 | DN 25 / 50 / 80 / 100
End Connections
• NPT / SWE / CL150RF / CL300RF / CL600RF / PN 16/25/40
Maximum Inlet Pressure
• 450 PSIG / 31 bar | Or body rating limit, whichever is lower
Maximum Outlet Pressure
• 450 PSIG / 31 bar | Or body rating limit, whichever is lower
Spring Ranges
• 25 to 375 PSIG / 1.7 to 25.9 bar
Additional Technical Data
• For additional technical information,?contact?your local?Sales Office?or refer to technical documentation.
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