Emerson Fisher 627R Direct-Operated Regulators are for low and high-pressure systems. These regulators can be used with natural gas, air or a variety of other gases. Used in Commercial and Industrial high-pressure applications like factories, office buildings, restaurants, etc. The 627R regulator has Token Relief, which means the regulator self-relieves a portion of downstream pressure that builds above the regulator Set-Point. But it is not sufficient, nor can it relieve the entire flow capacity of the regulator, and will likely require additional over-pressure protection devices.
For the Type 627R, regulator, the internal relief across the diaphragm provides overpressure protection in many applications. As outlet pressures build up above the start-to-discharge point, the diaphragm moves off the relief valve seat allowing the excess pressure to bleed out through the screened vent. For extra protection, should failure conditions exist which would prevent normal operation of the regulator (for example, disk broken off or disk erosion), the pusher post contacts the lever retainer causing the relief valve assembly to open. Since the diaphragm continues to rise as downstream pressure builds, it opens the relief valve; thereby, opening the valve. This internal relief may be not adequate for the application.
Note: Fisher Type 627R regulators should be installed with additional/external overpressure protection. These units should not be installed as part of a two-stage system in fixed piping serving 14 in. w.c. (35 mbar) appliance systems unless additional overpressure protection is installed that will make the system complaint with NFPA 58 requirements for a two-stage system.
Features
- Token Relief
- Relief Operation Indicator
- Easy to Maintain
- Installation Adaptability
- Application Versatility
- Tamper-Resistant
- Wide Range of Flow Capabilities
Specifications
- Series: 627R-117 - Token Relief
- Material: Ductile Iron
- Trim: Nitrile
- Inlet x Outlet: 3/4 in. FNPT
- Capacity: 10,755,000 BTU/hr
- Port Size: 1/2 in.
- Vent Size: 3/4 in. NPT screened
- Outlet Pressure Range: 5 to 20 PSI (.34 to 1.4 bar)
- Maximum Operating Pressure: 200 PSI (13.8 bar)
- Temperature Range: -20° to 180°F (-29° to 82°C)
- Certifications: CRN
Warning
Warning: Failure to follow the instructions or to properly install and maintain this equipment could result in an explosion and/or fire causing property damage and personal injury or death. Fisher™ regulators must be installed, operated and maintained in accordance with federal, state and local codes, rules and regulations, and Emerson Process Management Regulator Technologies, Inc. instructions. If the regulator vents gas or a leak develops in the system, service to the unit may be required. Failure to correct trouble could result in a hazardous condition. Call a gas service person to service the unit. Only a qualified person must install or service the regulator.
Downloads
Instruction Manual (PDF Download)
627 Series Data Sheet (PDF Download)
627R Regulator Schematic (PDF Download)
PED Classification Guide (PDF Download)
