627 Series Pressure Reducing Regulators - Emerson Electric

1 Bulletin D101331X012 627 Series December 2021. 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, 627MR and 627 BMR 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.

2 Types 627R, 627LR, 627MR and 627 BMR Travel Stop The internal relief valve still works if the disk or linkage fails. The pusher post (Figure 10) contacts the travel stop of the lever retainer and, as the diaphragm continues to rise, it opens the relief valve. W4793. Relief Operation Indicator A rubber cap Figure 1. Typical Type 627 Direct-Operated Pressure (Figure 11) slipped on the vent assembly pops off Reducing Regulator when the relief valve opens, indicating the relief valve has opened since the last inspection. Extended Body Option The Type 627 Long Body Easy to Maintain Trim parts can be replaced without is available with same face-to-face dimensions as the removing the regulator body from the pipeline.

3 A Type 630 with threaded NPT end connections. two-bolt connection between the body and diaphragm casing simplifies disassembly for maintenance. Tamper-Resistant An adjusting screw locknut and protective cap (Figure 2) is standard on all Installation Adaptability The diaphragm case 627 Series Regulators to discourage tampering and/or regulator body can be rotated in any of four with the Pressure setting. positions to allow regulator installation in locations with limited space (Figure 12). The regulator may be Wide Range of Flow Capabilities A selection of installed in any position without affecting operation body sizes and orifice sizes is available to satisfy as long as the spring case vent is protected from various flow requirements.

4 The elements. Tight Shutoff Capability A flat-faced disk of Application Versatility The different 627 Series Nitrile (NBR), Nylon (PA) or Fluorocarbon (FKM). constructions can be used as farm tap Regulators , provides excellent shut-off capability. regulator-relief valves, monitoring Regulators or high- Pressure industrial Regulators . 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 Body Sizes and End Connection Styles Type 627: Direct-operated Pressure Reducing Maximum Inlet Pressure (1) (Body Rating).

5 Regulator equipped with a pitot tube for greater NPT Stainless steel: 2000 psig / 138 bar regulated capacities (Figure 2). Flanged Stainless steel: 1440 psig / bar Type 627R: Type 627 with internal relief and open NPT Steel: 2000 psig / 138 bar throat (Figure 3). Flanged Steel: 1500 psig / 103 bar Type 627LR: Type 627R with light rate relief NPT Steel (Type 627 OSX): 1500 psig / 138 bar spring (Figure 3). Ductile iron: 1000 psig / bar Type 627M: Type 627 with a stem seal between the body outlet Pressure and diaphragm case. Maximum Valve Disk Inlet Pressure Rating(1). Pressure is measured under the diaphragm Nylon (PA) Disk: 2000 psig / 138 bar through the 1/4 NPT downstream control line Nitrile (NBR) Disk: 1000 psig / bar connection (Figure 2).

6 Fluorocarbon (FKM) Disk: 300 psig / bar Type 627BM: Direct-operated Pressure Reducing Maximum Operating Inlet and Outlet regulator with a balanced port and a stem seal Pressure Ranges(1). between the body outlet Pressure and diaphragm See Table 3 for pressures by orifice size and case. Pressure is measured under the diaphragm spring range through the 1/4 NPT downstream control Maximum Spring and Diaphragm Casing Pressure (1). line connection. See Table 2. Type 627MR: Type 627M with internal relief (Figure 5). Maximum Body Outlet Pressure (1)(2). Type 627 BMR: Type 627BM with internal relief. Types 627M, 627BM, 627MR, 627 BMR, 627HM.

7 Type 627H: Type 627 with a diaphragm limiter to and 627 BHM only deliver a higher outlet Pressure (Figure 6). NPT Steel: 2000 psig / 138 bar Type 627HM: Type 627H with a stem seal between Flanged Steel: 1500 psig / 103 bar the body outlet Pressure and diaphragm case. Ductile iron: 1000 psig / bar Pressure is measured under the diaphragm through Type 627 OSX. the 1/4 NPT downstream control line connection NPT Steel: 1500 psig / 103 bar (Figure 7). Orifice Sizes Type 627 BHM: Type 627BH with a stem seal See Table 3. between the body outlet Pressure and diaphragm case. Pressure if measured under the diaphragm Internal Relief Performance through 1/4 NPT downstream control line.

8 Type 627R: See Table 4 and Figure 13. Type 627 OSX: Type 627 with Type OSE slam-shut Type 627LR: See Table 5. device for overpressure protection. Available with Types 627MR and 627 BMR: Limited by field- Over and Under Pressure Trip points (Figure 9). installed control line piping Regulator Capacities BODY SIZE END CONNECTION. NPS DN STYLE. CONSTRUCTION AVAILABLE Type 627, 627M, 627BM, 627MR or 627 BMR: Types 627, 627R, 627LR, 627M, See Tables 6 to 10. 3/4 ---- NPT. 627MR, 627H and 627HM Type 627H, 627HM or 627 BHM: See Tables 11 to 13. NPT, CL150 RF, CL300 RF, CL600 RF. All Type 627R: See Tables 14 to 15. 1 25. Types 627, 627R, 627LR, 627M, Flow Coefficients Long Body 627MR, 627H and 627HM.

9 Types 627, 627R, 627LR, 627M, See Table 16. 1-1/4 32 NPT. 627MR, 627H and 627HM. NPT, CL150 RF, IEC Sizing Coefficients All 2 50. CL300 RF, CL600 RF See Table 17. Types 627, 627R, 627LR, 627M, Long Body 627MR, 627H and 627HM. 1. The Pressure /temperature limits in this Bulletin or any applicable standard limitation should not be exceeded. 2. Types 627, 627H, 627R and 627LR are limited by maximum diaphragm casing Pressure . - continued - 2. 627 Series Specifications (continued). Construction Materials Relief Indicator Body: Ductile iron, WCC steel, Stainless steel For Types 627R, 627LR, 627MR and 627 BMR. Spring Case and Diaphragm Case: WCC steel, (see Figure 11).

10 Stainless steel, ductile iron or die cast aluminum Elastomer Temperature Capabilities(1)(2). Construction Materials (continued). Pressure Registration Orifice: Aluminum (standard) or Stainless steel Type 627, 627H, 627R or 627LR: Internal Disk Holder with Valve Disk: Type 627M, 627BM, 627HM, 627 BHM, 627MR. 2000 psig / 138 bar Maximum Pressure : or 627 BMR: External through 1/4 NPT internal Aluminum or Stainless steel with Nylon (PA). control line connection in the diaphragm casing 1000 psig / bar Maximum Pressure : Aluminum (standard) or Stainless steel De-Icer System with Nitrile (NBR) See Figure 14 and Type 627M De-Icer System 300 psig / bar Maximum Pressure : Stainless Application section steel or Aluminum with Fluorocarbon (FKM) disk Spring Case Orientation and Vent Location O-rings: Nitrile (NBR) or Fluorocarbon (FKM) See Figure 12.