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627 Series Pressure Reducing Regulators

627 Series Pressure Reducing Regulators
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627 Series Pressure Reducing Regulators - 1

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 7) 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 8) 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 9). The regulator may be installed in any position without affecting operation as long as the spring case vent is protected from the elements. • Application Versatility—The different 627 Series constructions can be used as farm tap regulators, regulator-relief valves, monitoring regulators or high-pressure industrial regulators. Figure 1. ypical Type 627 Direct-Operated Pressure T 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) pr

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627 Series Pressure Reducing Regulators - 2

627 Series 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...

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627 Series Pressure Reducing Regulators - 3

627 Series Specifications (continued) Relief Indicator For Types 627R, 627LR and 627MR (see Figure 8) Elastomer Temperature Capabilities(1)(2) MATERIAL Nitrile (NBR) Fluorocarbon (FKM) DISK/ DIAPHRAGM Disk Dipahragm Disk Diaphragm Neoprene (CR) for Types 627H and 627HM only Neoprene (CR) for Types 627HOSX and 627HMOSX only Nitrile (NBR) for Types 627OSX and 627MOSX 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 11 and Type 627M De-Icer...

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627 Series Pressure Reducing Regulators - 4

627 Series ADJUSTING SCREW CAP ADJUSTING SCREW SPRING CASE CONTROL SPRING PITOT TUBE SCREENED VENT ASSEMBLY Month Year Type 627M PUSHER POST DIAPHRAGM CASING DISK ASSEMBLY INLET PRESSURE OUTLET PRESSURE ATMOSPHERIC PRESSURE 1/4 NPT CONTROL LINE CONNECTION BLOCKING THROAT STEM SEAL INLET PRESSURE OUTLET PRESSURE ATMOSPHERIC PRESSURE Figure 2. Types 627 and 627M Operational Schematics

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627 Series Pressure Reducing Regulators - 5

Month Year Type 627R Schematic Open LARGE OPENING FOR RELIEF W4679-2 INLET PRESSURE OUTLET PRESSURE ATMOSPHERIC PRESSURE Month Year INTERNAL RELIEF FLOW PATH Type XXXX Type 627R Schematic Closed RELIEF VALVE SPRING INTERNAL RELIEF VALVE PUSHER POST LEVER RETAINER INLET PRESSURE OUTLET PRESSURE ATMOSPHERIC PRESSURE INLET PRESSURE OUTLET PRESSURE ATMOSPHERIC PRESSURE Figure 3. Types 627R and 627LR Operational Schematics

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627 Series Pressure Reducing Regulators - 6

Month Year INLET PRESSURE OUTLET PRESSURE ATMOSPHERIC PRESSURE 1/4 NPT CONTROL LINE CONNECTION W4682-2 INTERNAL RELIEF FLOW PATH Month Year INLET PRESSURE OUTLET PRESSURE ATMOSPHERIC PRESSURE INLET PRESSURE OUTLET PRESSURE ATMOSPHERIC PRESSURE Figure 4. Type 627MR Operational Schematics INTERNAL RELIEF VALVE BLOCKING THROAT STEM SEAL

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627 Series Pressure Reducing Regulators - 7

627 Series 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 PRESSURE ATMOSPHERIC PRESSURE DISK ASSEMBLY PUSHER POST INLET PRESSURE OUTLET PRESSURE ATMOSPHERIC PRESSURE Figure 5. Types 627H and 627HM Operational Schematics Principle of Operation 627 Series Pilot Refer to Figures 2 through 5. When downstream...

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627 Series Pressure Reducing Regulators - 8

ADJUSTING SCREW CAP ADJUSTING SCREW SCREENED VENT ASSEMBLY SPRING CASE CONTROL SPRING PITOT TUBE PUSHER POST LEVER DIAPHRAGM CASING LEVER RETAINER BLOCKING THROAT STEM SEAL DISK ASSEMBLY INLET PRESSURE OUTLET PRESSURE ATMOSPHERIC PRESSURE Figure 6. Type 627OSX with Type 627 Regulator and Type OSE Slam-Shut Valve

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627 Series Pressure Reducing Regulators - 9

LEVER RETAINER PUSHER POST TRAVEL STOP Figure 7. Internal Relief Construction Feature Figure 8. Relief Indicator Table 1. Maximum Cold Working Pressure of Body Inlet (Body Rating)(1)(2) BODY SIZE BODY MATERIAL Ductile iron MAXIMUM INLET PRESSURE psig Stainless steel Ductile iron Stainless steel Ductile iron 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. Overpressure Protection Regulator operation within ratings does not preclude the possibility of damage from debris in the...

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