The Fisher 1098-EGR is a pilot-operated regulator designed for precise pressure control in high-capacity applications. It is widely used in natural gas distribution, industrial boiler fuel supply, and large commercial facilities. This 4-inch configuration offers superior stability across varying loads. To help engineers maximize system efficiency, this guide details the technical advantages and specifications of the 1098-EGR series.
Fisher 1098-EGR (actual product image)
01 Core Performance Features
The Fisher 1098-EGR is engineered to solve complex regulation challenges in both gas and liquid applications.
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Low Differential Pressure: This model operates effectively with a pressure differential as low as 1 psid (70 mbar d), making it ideal for low-head systems.
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Precision Control: The pilot-operated design ensures a stable downstream pressure regardless of fluctuations in inlet pressure or demand.
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Noise Reduction: Optional Whisper Trim technology can reduce operational noise by up to 30 dBa.
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Top-Entry Maintenance: The straight-through design allows for inspection and parts replacement without removing the valve body from the pipeline.
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Zero Atmospheric Discharge: The pilot system vents all gas to the downstream piping, eliminating hazardous emissions to the air.
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High Turndown Ratio: Oversized diaphragms and linear cages handle large swings in downstream demand while maintaining accuracy.
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Bubble-Tight Shutoff: A knife-edge metal plug and soft seat provide positive closure for dead-end service.
02 Technical Specifications
The following parameters represent the operational limits and physical configurations for the Fisher 1098-EGR.
| Parametr | Specification Range |
| Maksimal kirish bosimi | 28 bar (400 psig) |
| Chiqish bosimi diapazoni | 0.005 to 20.7 bar |
| Ishlash harorati | -29 to 82 ℃ |
| 1-inch and 2-inch sizes | NPT Threaded |
| 2, 3, 4, 6-inch sizes | ANSI 125FF / 150RF / 250RF / 300RF / 600RF Flanged |
Fisher 1098-EGR (actual product image)
03 Pilot Selection and Outlet Pressure Ranges
The outlet pressure of the Fisher 1098-EGR is determined by the specific pilot model installed.
| Pilot Model | Control Pressure Range (psig) | Control Pressure Range (bar) |
| 6351 | 3 to 100 | 0.21 to 6.9 |
| 6352 | 14-inch WC to 10 | 35 mbar to 0.69 |
| 6353 | 3 to 40 | 0.21 to 2.8 |
| 6354L | 35 to 125 | 2.4 to 8.6 |
| 6354M | 85 to 200 | 5.9 to 13.8 |
| 6354H | 175 to 300 | 12.1 to 20.7 |
Fisher 1098-EGR (actual product image)
04 Procurement and Technical Support
Selecting the correct 4-inch Fisher 1098-EGR requires careful verification of pilot springs and seat materials. Xi’an Yunrui Trading Co., Ltd. (Yunrui) provides expert assistance in configuring these regulators for critical infrastructure.
Our technical support includes verifying Cv ratings and selecting appropriate trim options for noise or cavitation control. By maintaining stock of key 1098-EGR components in the Xi’an warehouse, we ensure rapid response to maintenance needs. Specialized logistics management facilitates DDP delivery to global project sites, ensuring all customs and regional documentation requirements are satisfied for on-time installation.
