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Details the materials used for the Type LR125 main valve and pilot components.
Describes the MR95H and MR95HP pressure reducing pilots used with the Type LR125.
Explains how the Type LR125 pressure reducing liquid regulator functions.
Provides critical safety and procedural guidance for installing the Type LR125 regulator.
Step-by-step instructions for safely starting up the Type LR125 regulator.
Guidance on adjusting the outlet pressure setting of the pilot for the Type LR125.
Recommendations for setting the Type 112 restrictor for optimal regulator performance.
Instructions for safely shutting down and isolating the Type LR125 regulator.
Details on the parts for the Type LR125 main valve trim and their references.
Procedures for safely disassembling and reassembling the Type LR125 regulator.
Instructions for maintaining or replacing the diaphragm and plug assembly.
Procedures for maintaining the travel indicator assembly of the Type LR125.
Maintenance instructions for the Type MR95H and MR95HP pilots.
A guide to identify and resolve common issues with the Type LR125 regulator.
Procedures for maintaining the Type 112 restrictor, including cleaning.
Information on ordering replacement parts and a list of available parts.
Details the materials used for the Type LR125 main valve and pilot components.
Describes the MR95H and MR95HP pressure reducing pilots used with the Type LR125.
Explains how the Type LR125 pressure reducing liquid regulator functions.
Provides critical safety and procedural guidance for installing the Type LR125 regulator.
Step-by-step instructions for safely starting up the Type LR125 regulator.
Guidance on adjusting the outlet pressure setting of the pilot for the Type LR125.
Recommendations for setting the Type 112 restrictor for optimal regulator performance.
Instructions for safely shutting down and isolating the Type LR125 regulator.
Details on the parts for the Type LR125 main valve trim and their references.
Procedures for safely disassembling and reassembling the Type LR125 regulator.
Instructions for maintaining or replacing the diaphragm and plug assembly.
Procedures for maintaining the travel indicator assembly of the Type LR125.
Maintenance instructions for the Type MR95H and MR95HP pilots.
A guide to identify and resolve common issues with the Type LR125 regulator.
Procedures for maintaining the Type 112 restrictor, including cleaning.
Information on ordering replacement parts and a list of available parts.
The Type LR125 is a pilot-operated, pressure-reducing liquid regulator designed for liquid applications. It includes a Type 112 restrictor and a 1/2 NPT Type MR95H/MR95HP pilot. The regulator's primary function is to maintain a desired outlet (control) pressure by adjusting the main valve's opening in response to changes in downstream pressure.
The Type LR125 operates on a principle where, as long as the outlet (control) pressure is above its set point, the pilot valve plug or disk remains closed. The main spring force, combined with inlet pressure bleeding through the restrictor, provides downward loading pressure to keep the main valve diaphragm and plug assembly tightly shut off. When the outlet pressure drops below the pilot's set point, the pilot plug or disk assembly opens, allowing loading pressure to bleed downstream faster than it can be replaced through the supply line. This reduction in loading pressure on top of the main valve diaphragm and plug assembly allows the unbalanced force between inlet and loading pressure to overcome the main spring force, opening the Type LR125 diaphragm and plug assembly. As the outlet pressure rises back towards the set point, it compresses the pilot diaphragm against the pilot control spring, closing the pilot valve plug or disk. Loading pressure then builds on the Type LR125 diaphragm and plug assembly, pushing it onto the tapered-edge seat for tight shutoff.
The Type MR95H pilot is a pressure-reducing pilot for outlet pressures ranging from 15 to 150 psig (1.0 to 10.3 bar) and handles inlet pressures up to 300 psig (20.7 bar). The Type MR95HP pilot is a pressure-reducing pilot for outlet pressures from 15 to 400 psig (1.0 to 27.6 bar) and handles inlet pressures up to 600 psig (41.4 bar).
The Type LR125 is designed for liquid service and should not be operated in applications where temperatures are below the process fluid's freezing point or above its boiling point, as these limits are dependent on the process fluid and application pressures.
General| Brand | Emerson |
|---|---|
| Model | Fisher LR125 |
| Category | Controller |
| Language | English |
