Bulletin 71.1:627 February 2011
627 Series Pressure Reducing Regulators Introduction The 627 Series direct-operated pressure reducing regulators (Figure 1) are for low and high-pressure systems. These regulators can be used with natural gas, air, or a variety of other gases. Performance characteristics vary according to construction (see the Specifications section).
Features • Internal Relief Valve—Types 627R, 627LR, and 627MR regulators have an internal relief valve, which in many cases eliminates the usual requirement for an external relief valve, thereby reducing equipment and maintenance costs. Refer to the Specifications section for performance data. • Types 627R, 627LR, and 627MR Travel Stop— The internal relief valve still works if the disk or linkage fails. The pusher post (Figure 6) contacts the travel stop of the lever retainer and, as the diaphragm continues to rise, it opens the relief valve.
• Relief Operation Indicator—A rubber cap (Figure 7) slipped on the vent assembly pops off when the relief valve opens, indicating the relief valve has opened since the last inspection.
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Figure 1. Typical 627 Direct-Operated Pressure Reducing Regulator
• Easy to Maintain—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. • Installation Adaptability—The diaphragm case and/or regulator body can be rotated in any of four positions to allow regulator installation in locations with limited space (Figure 8). The regulator may be installed in any position without affecting operation as long as the spring case vent is protected from the elements.
• Tamper-Resistant—An adjusting screw locknut and protective cap (Figure 2) is standard on all 627 Series regulators to discourage tampering with the pressure setting.
• Wide Range of Flow Capabilities—A selection of body sizes and orifice sizes is available to satisfy various flow requirements. • Tight Shutoff Capability—A flat-faced disk of Nitrile (NBR), Nylon (PA), or Fluorocarbon (FKM) provides excellent shut-off capability.
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• Application Versatility—The different 627 Series constructions can be used as farm tap regulators, regulator-relief valves, monitoring regulators, or high-pressure industrial regulators.
• Extended Body Option—The Type 627 Long Body is available with same face-to-face dimensions as the Type 630 with threaded NPT end connections.
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