In high-standard industrial sectors such as oil and gas, power generation, and fine chemicals, the stability of pressure control systems is the cornerstone of operational safety. Facing the extreme challenges of high temperatures (up to 343°C), high pressures (up to 1000 psig), and highly corrosive media, the Fisher MR95 series pressure reducing valves and MR98 series back pressure valves from Emerson have become recognized technical benchmarks in the global industrial arena.
To meet urgent project demands, Xi’an Yunrui Trading Co., Ltd. (yunrui) maintains a significant inventory of these prominent models. Leveraging our direct supply channels, we offer highly competitive pricing to ensure your projects are delivered efficiently and cost-effectively.
1. Core Technical Principles: Millisecond-Response Direct-Acting Regulation
The Fisher MR95 and MR98 series both utilize direct-acting regulation principles. This technology requires no external pneumatic or electric power sources, achieving regulation solely through the balance between the medium’s own pressure and the internal precision spring force. This results in rapid response, structural simplicity, and extremely low maintenance costs.
MR95 Series Pressure Reducing Valves: Differential Pressure Compensation
The MR95 series achieves pressure reduction through a mechanical conduction structure involving the diaphragm, valve stem, and valve core. Its core highlight is the built-in differential pressure compensation mechanism, which effectively neutralizes the interference of upstream pressure fluctuations on regulation accuracy. Even when inlet pressure fluctuates by ±20%, the outlet pressure deviation remains within ≤±3%, far exceeding conventional industry standards.
MR98 Series Back Pressure Valves: Multi-Mode Pressure Control
The MR98 series integrates back pressure maintenance and overpressure relief functions. It supports both internal and external pressure sensing modes. The external sensing design allows for direct perception of downstream system pressure, effectively avoiding pressure loss when high-viscosity media flow through the valve body, making it ideal for clog-prone or high-viscosity industrial fluids.
2. Precise Selection: Full-Dimensional Material Adaptation
To address pain points such as corrosion, wear, and aging, the MR95 and MR98 provide an exceptionally rich matrix of material combinations, ensuring a long service life across diverse media environments. Available materials are extensive and can be precisely matched to your specific working conditions.
| Component | Material Options | Technical Indicators and Applications |
| Valve Body | WCC Steel, CF8M/CF3M Stainless Steel | CF3M stainless steel significantly improves pitting resistance against chloride media. |
| Core/Seat | 316 Stainless Steel, Stellite Alloy | Stellite alloy features extreme hardness, with 5x the erosion resistance of standard steel. |
| Seals | NBR, EPDM, FKM, FFKM, PTFE | FFKM materials offer wide temperature ranges and resistance to almost all chemicals. |
| Diaphragm | Reinforced FKM Composite, Metal Bellows | Composite diaphragms feature a cycle life of ≥100,000, suitable for high-frequency regulation. |
3. Structural Optimization: Reducing Long-Term Operating Costs
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Modular Design: The valve cores, seats, and diaphragms of the MR95 and MR98 series can be individually disassembled and replaced. Since there is no need to remove the entire valve body from the pipeline, on-site maintenance downtime can be reduced by approximately 60%.
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Customization for Extreme Conditions: For high-temperature steam, the MR95HT model uses a ceramic fiber insulation layer to support continuous operation at 343°C. For cryogenic LNG or liquid nitrogen applications, the MR98LD model utilizes high-toughness low-temperature materials to prevent brittle fracture.
Common Model Codes for Quick Selection
To assist in rapid procurement, yunrui has categorized the most frequently requested models and their typical applications:
Series Common Code Technical Features and Applications MR95 Series (Reducing) MR95L Low-pressure model, ideal for settings between 2 to 30 psi. MR95H High-pressure model, standard range between 5 to 150 psi. MR95HP Enhanced high-pressure version, settings up to 400 psi. MR95HT High-temperature version with specialty diaphragms for up to 343°C steam. MR95S Stainless steel construction for corrosive or sanitary environments. MR98 Series (Back Pressure) MR98L Low-pressure relief, settings from 2 to 30 psi. MR98H High-pressure relief, standard range from 15 to 200 psi. MR98HH Ultra-high pressure back pressure model, up to 375 psi. MR98V Vacuum back pressure valve for negative pressure system maintenance. 
Xi’an Yunrui Trading Co., Ltd. maintains an extensive inventory of original Fisher MR95 Series Pressure Reducing Valves そして MR98 Series Back Pressure Valves. We offer competitive pricing and are ready for immediate dispatch to ensure fast delivery.
4. Authoritative Certification and Global Application
The Fisher MR95 and MR98 series have obtained numerous international certifications, including the NACE MR0175 standard for sour gas environments, ASME B16.34 standards, and ATEX/IECEx explosion-proof certifications. Currently, these products are widely used in wellhead pressure reduction, chemical reactor overpressure protection, boiler steam systems in the power industry, and sterile fluid transport in pharmaceuticals.
As a professional supplier of Emerson Fisher regulator products, Xi’an Yunrui Trading Co., Ltd. (yunrui) is dedicated to helping global customers achieve precise and safe fluid pressure control through professional technical selection and excellent logistics services. By leveraging large-scale procurement, we ensure immediate availability while providing you with more attractive price discounts.