The Fisher 627 Series direct-operated pressure reducing regulator is for low and high-pressure systems. These regulators can be used with natural gas, air or a variety of other gases.
Trim parts can be replaced without removing the regulator body from the pipeline. A two-bolt connection between the body and diaphragm casing simplifies disassembly for maintenance. The diaphragm case and/or regulator body can be rotated in any of four positions to allow regulator installation in locations with limited space. The regulator may be installed in any position without affecting operation as long as the spring case vent is protected from the elements. An adjusting screw locknut and protective cap is standard on all 627 series regulators to discourage tampering with the pressure setting.
The different 627 Series constructions can be used as farm tap regulators, regulator-relief valves, monitoring regulators, slam-shut regulators or high-pressure industrial regulators.
627R regulator have an internal relief valve which often eliminates the need for an external relief valve, thereby reducing equipment and maintenance costs. The internal relief valve still works if the disk or linkage fails. The pusher post contacts the travel stop of the lever retainer and, as the diaphragm continues to rise, it opens the the relief valve.
