RM-1331 R9 Sensus Metering Systems Model 461 …

1 RM-1331 R9 Sensus Metering SystemsInstallation andMaintenanceInstructionsModel 461-57S RegulatorTHE GAS INDUSTRY2 Installation and Maintenance InstructionsModel 461-57S RegulatorWhere outlet piping increases in size near the regulator, itsgenerally preferable to locate the control connection in the larger 1/4" union 20 contains a small orifice, approximately 1/16" diameter. This orifice should not be removed. Also, make certain this orifice is open and free of foreign diaphragm case vent must be positioned to protect againstflooding, drain water, ice formation, traffic, tampering, etc.

2 The ventmust be protected against nest building animals, bees, insects, etc., toprevent vent blockage and minimize chances for foreign material fromcollecting in the vent side of the regulator all connections for the regulator into operation as follows: (See Figure 1)1. Slowly open the downstream control line valve Slowly open the downstream block valve Very slowly open the upstream block valve Set the adjusting screw 2for the required outlet it clockwise to increase the pressure and counterclockwise to decrease it. Only make thisadjustment when gas is actually flowing through the gas on very slowly.

3 If an outlet stop valve is used, itshould be opened first. Do not overload diaphragm with a sudden surge of inlet pressure. Monitor the outlet pressure during start-up to prevent an outlet pressure After adjustment is complete, the locknut 3 should be tightened firmly and the seal cap 1 shut down, carefully close valves C, B, and Ain that heart of the Model 461-57S is the Roll-Out Diaphragm. The461-57S is a spring regulator with performance which approxi-mates that of a pilot operated regulator. The Roll-Out Diaphragmmakes this exceptional performance possible because its uniqueaction reduces droop to a minimum ( droop being fall off inoutlet pressure as a spring regulator opens to increase flow).

4 Installation and Start-Up1 Thoroughly purge inlet piping to remove dirt and debris which could damage the regulator or impair its operation. If this cannot be done, a filter or strainer should be installed ahead of the regulator (see Sensus Bulletin RDS-1498, Regulator Pressure Ratings). Make certain that regulator is free of any dirt or foreign matter that might have regulator in the line with high pressure connected to theinlet side (be sure that shipping screens or covers, if used, areremoved from the inlet and outlet). On flanges, tighten bolts required, the regulator may be inverted.

5 It may also beinstalled in a vertical line. However, if installed in a vertical line, there could be excessive wear in anti-friction the 1/4" union 20 extend pipe or tubing to the controlconnection into the oulet piping. (See Figure 1 on page 2.) This control piping should not be less than 1/4" in size and should be adequately protected against breakage (regulators go wide open if the control line is broken.)CAUTIONIt is the user's responsibility to assure that all regulator vents and/or vent lines exhaust to a non-hazardous location away from ANYPOTENTIAL sources of ignition.

6 Where vent lines are used, it is theuser's responsibility to assure that each regulator is individually ventedand that common vent lines ARENOT regulator will work to deliver the pressure, for which it isadjusted, at that point in the outlet piping where the control connection is general the control connection should be at least eight pipediameters from the regulator and should be in as straight a run of pipe as control connection should be clean and smooth, free ofrough edges, welding icicles , PressureColor ofNominalRangeSpringDiaphragm Size ( )3 to 6 psiYellow5 to 9 psiGray7-1/2 to 15 psiBlue12-1/2 to 30 psiRed5" all ranges25 to 55 psiBrown50 to 75 psiBlack70 to 100 psiBrown plus White**White colored spring is nested within Inlet Pressures for all Regulator Body TypesMaximum WorkingMaximumPressureInletRegulator Body Type461 Body Materialsof BodyPressureScrewed EndCast Iron (ASTM A126-71 Class B)250 psi250 psiFlanged ANSI 125 lb.

7 FFCast Iron (ASTM A126-71 Class B)175 psi175 psiFlanged ANSI 250 lb. RFDuctile Iron (ASTM A395-71 gr 60-4-18)575 psi575 psiFlanged ANSI 300 lb. RFCast Steel (ASTM A216-70a gr WCB)720 psi720 psiFlanged ANSI 600 lb. RFCast Steel (ASTM A216-70a gr WCB)1200 psi1000 psiSpring Ranges5"(Minumum Service Space)Self AdjustmentScrew for Desired Outlet Pressure231 VentRemove Vent(If Required) "20 ADownstreamControl LineControl LineConnectionBOutlet8"4"FMinumumService Space(Bypass (If Required)InletC3 Installation and Maintenance InstructionsModel 461-57S RegulatorServicing and AdjustmentGeneral Notes (see Illustration on page7))

8 1 Make sure the regulator is entirely depressured before quick visual inspection of the valve can be made by removing inspection plates 33from the sides of the body. These also provide greatly improved access to the valve when servicing or diaphragm 11d, the springs 9, and all other parts from the diaphragm up (except the 11hstud) are interchangeable with the Model 441-57S Regulator. Valve and body parts are interchangeable with other 461 Regulators (461-S, 461-X57, 1100, 1200, 461-2100).4 Use lubricants sparingly and with care to avoid exposing tackysurfaces to the gas stream.

9 Such surfaces could cause dirt accumulation on close clearance moly or silicone type lubricants. Avoid the use of petroleum base types. Lubricate the stem 12b,guide 12jand stem O-rings 12a& 12n with dry silicon lubricant to help assure free movement and a tight seal. An application of lubricant to other O-rings and the tetrasealsin the regulator will also help assure their using double seat balanced valve assembly, bushing 13must be screwed firmly into place. When using single seat balanced valve assembly, bushing 13must be removed. To Service Double Seat Balanced Valve Assembly1 Remove seal cap 1, back off adjusting screw 2, remove housing cover 6, and remove spring bottom inspection plate 14, and unscrew valve assembly intact from diaphragm assembly (12bunscrews from 11h).

10 3 Unscrew orifice 18with socket wrench (1-1/2" hex, deep socket). Remove orifice 18and valve assembly intactthrough bottom valve assembly and orifice are alright, screw orifice 18firmly into place. Replace without disturbing set screw 12g. Top end of 12bscrews into 11huntil it bottoms and should then be backed off 1/2 to 1 full new parts are needed, disassemble valve assembly by loosening set screw 12gand unscrewing 12hfrom 12b, and then unscrewing nut 12eand part 12j. 6 Replace parts as required, then reassemble upper half valveassembly (parts 12a, 12b, 12c, 12d, 12e) and lower half (parts 12f, 12g, 12h, 12c, 12d, 12j).