Fisher 627 Pressure Regulator Overview
The Fisher 627 pressure regulator is a direct-operated pressure reducing regulator designed for natural gas, air, and various industrial gases. With pressure ratings up to 2000 psig and a wide range of configurations, this series delivers reliable performance for both low and high-pressure systems.
Key Features
- Internal Relief Valve — Protects downstream equipment from overpressure
- Travel Stop (627R/627MR) — Limits travel to prevent damage
- Relief Operation Indicator — Visual indication of relief valve operation
- Easy to Maintain — Simplified design reduces downtime
- Installation Adaptability — Multiple end connection options
- Application Versatility — Suitable for natural gas, air, and industrial gases
- Tamper-Resistant — Prevents unauthorized adjustments
- Wide Range of Flow Capabilities — Covers diverse application requirements
- Balanced Trim — Stable performance under varying inlet pressures
Technical Specifications
Body Sizes and End Connections
- 3/4, 1, or 2 inch: NPT end connections
- NPS 1 or 2 / DN 25 or 50: CL150 RF, CL300 RF, CL600 RF flanged end connections
Maximum Inlet Pressure
| NPT Steel | 2000 psig / 138 bar |
| Flanged Steel | 1500 psig / 103 bar |
| Ductile Iron | 1000 psig / 69.0 bar |
Outlet Pressure Range
5 to 500 psig / 0.34 to 34.5 bar in six ranges
Pressure Registration
- Internal: Type 627, 627H, 627R
- External: Type 627M, 627HM, 627BM, 627BHM, 627MR, 627BMR (through 1/4 NPT control line)
Temperature Capabilities
-40°F to 180°F / -40°C to 82°C
Approximate Weights
| Ductile Iron or Steel Casings | 10 lbs / 5 kg |
| Aluminum Casings | 6.3 lbs / 3 kg |
Hydrogen Service
This pressure regulator has been validated for hydrogen service through extensive high-pressure testing. Sealing performance and material compatibility were analyzed for safe operation in hydrogen applications.
Model Selection Guide
| Model | Pressure Registration | Key Feature |
|---|---|---|
| 627 | Internal | Standard direct-acting regulator |
| 627H | Internal | High-pressure capability |
| 627R | Internal | With travel stop |
| 627M | External | External registration |
| 627MR | External | External with travel stop |
Applications
- Natural gas distribution systems
- Industrial boiler fuel gas regulation
- Air compressor systems
- Corrosive media environments (with appropriate materials)
- Hydrogen blending applications
Related Resources
For detailed selection guidance, model codes, and troubleshooting information, see our complete Fisher 627 pressure regulator technical manual.
Why Source from YUNRUI
- Genuine Fisher regulators from authorized channels
- DN20 to DN50 sizes in stock
- Multiple material options: ductile iron, steel, stainless steel
- Fast global delivery
- Technical support for selection and application
For specifications, pricing, and availability, contact our team:
Email: sales@yunrui-controls.com
WhatsApp: 18710784030
