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. • 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. Figure 1.  Typical 627 Direct-Operated Pressure Reducing Regulator • 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. • 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. • Application Versatility—The different 627 Series constructions can be used as farm tap regulators, regulator-relief valves, monitoring regulators, or high-pressure industrial regulators.

Bulletin 71.1:627 Specifications The Specifications section gives some general specifications for the 627 Series regulators. The nameplates give detailed information for a particular regulator as it comes from the factory. Available Constructions Type 627: Direct-operated pressure reducing regulator equipped with a pitot tube for greater regulated capacities (Figure 2). Type 627R: Type 627 with internal relief and open throat (Figure 3). Type 627LR: Type 627R with light rate relief spring (Figure 3). Type 627M: Type 627 with a stem seal between the body outlet pressure and diaphragm case. Pressure...

Bulletin 71.1:627 Specifications (continued) Relief Indicator For Types 627R, 627LR, and 627MR (see Figure 7) Elastomer Temperature Capabilities(1)(3) MATERIAL Nitrile (NBR) Fluorocarbon (FKM) DISK/ DIAPHRAGM Disk Dipahragm Disk Diaphragm Neoprene (CR) for Types 627H and 627HM only Pressure Registration Type 627, 627H, 627R, or 627LR: Internal Type 627M, 627HM, or 627MR: External through 1/4 NPT internal control line connection in the diaphragm casing De-Icer System See Figure 10 and Type 627M De-Icer System Application section Spring Case Orientation and Vent Location See Figure 8 Spring Case...

Bulletin 71.1:627 ADJUSTING SCREW CAP LOCKNUT ADJUSTING SCREW 1/4 NPT CONTROL LINE CONNECTION SPRING CASE CONTROL SPRING PITOT TUBE SCREENED VENT ASSEMBLY INLET PRESSURE OUTLET PRESSURE ATMOSPHERIC PRESSURE BLOCKING THROAT STEM SEAL ORIFICE PUSHER POST DIAPHRAGM CASING DISK ASSEMBLY Figure 2.  Types 627 and 627M Operational Schematics Month Year Type 627R Schematic Closed RELIEF VALVE SPRING LARGE OPENING FOR RELIEF INTERNAL RELIEF VALVE PUSHER POST LEVER RETAINER INLET PRESSURE W4681-2 OUTLET PRESSURE ATMOSPHERIC PRESSURE LET PRESSURE W4679-2 TLET PRESSURE MOSPHERIC PRESSURE INTERNAL RELIEF...

Month Year Month Year 1/4 NPT CONTROL LINE CONNECTION W4682-2 INLET PRESSURE OUTLET PRESSURE ATMOSPHERIC PRESSURE RESSURE T PRESSURE PHERIC PRESSURE INTERNAL RELIEF VALVE INTERNAL RELIEF FLOW PATH BLOCKING THROAT STEM SEAL Figure 4.  Type 627MR Operational Schematics Type XXXX Month Year BLOCKING THROAT STEM SEAL ADJUSTING SCREW CAP ADJUSTING SCREW SPRING CASE 1/4 NPT CONTROL LINE CONNECTION CONTROL SPRING SCREENED VENT ASSEMBLY DIAPHRAGM LIMITER DIAPHRAGM HEAD INLET PRESSURE OUTLET PRESSURE ATMOSPHERIC PRESSURE DIAPHRAGM LIMITER O-RING PUSHER POST O-RINGS PITOT TUBE INLET PRESSURE CASING OUTLET...

LEVER RETAINER PUSHER POST TRAVEL STOP Figure 6.  Internal Relief Construction Feature Figure 7.  Relief Indicator Table 1.  Maximum Cold Working Pressure of Body Inlet (Body Rating)(1)(2) NPS BODY SIZE BODY MATERIAL Ductile iron Steel Stainless Steel Ductile iron Stainless Steel 1. The pressure/temperature limits in this Bulletin, and any applicable standard or code should not be exceeded. 2. Temperature may decrease these maximum pressures. Note If the regulator is shipped mounted on another unit, install that unit according to the appropriate Instruction manual. Overpressure Protection 627...

Bulletin 71.1:627 Table 2.  Maximum Inlet Pressures and Outlet Pressure Ranges TYPE OUTLET PRESSURE RANGE, SPRING PART NUMBER, AND COLOR CODE 5(2) to 20 psig / 0.34 to 1.4 bar 10B3076X012 Yellow 15 to 40 psig / 1.0 to 2.8 bar 10B3077X012 Green 35 to 80 psig / 2.4 to 5.5 bar 10B3078X012 Blue 70 to 150 psig / 4.8 to 10.3 bar 10B3079X012 Red 5(2) to 20 psig / 0.34 to 1.4 bar 10B3076X012 Yellow 15 to 40 psig / 1.0 to 2.8 bar 10B3077X012 Green 35 to 80 psig / 2.4 to 5.5 bar 10B3078X012 Blue 70 to 150 psig / 4.8 to 10.3 bar 10B3079X012 Red 15 to 40 psig / 1.0 to 2.8 bar 10B3077X012 Green 140 to 250...