Type S301 & S302 Gas Regulators - KFNGS

1 Fisher Controls 1981 Fisher ControlsInstruction ManualType S301 & s302 Gas RegulatorsOctober 1981 Form 5180 Type S301 and S302D400004X012 Figure 1. Typical S301 Series RegulatorINTRODUCTIONINSTALLATIONF isher Regulators must be installed, operated,and maintained in accordance with federal,state, and local codes, rules and regulations,and Fisher instructions. For LP-gas service,an approved regulator (such as one listed ) should be used. The installation, in moststates, must comply with NFPA the regulator vents gas or a leak developsin the system, service to the unit may be re-quired. Failure to correct trouble could resultin a hazardous a gas serviceman to service the unit. Onlya qualified person must install or service of ManualThis instruction manual provides instructions and a partslist for types S301, S301H, s302 , and S302H gas S301 series Regulators are typically installed onindustrial and commerical applications.

2 The s302 andS302H units contain an internal relief valve. Units withan H suffix are similar to the basic Regulators but delivera higher outlet pressure (1 to 8 psig).SpecificationsTable 1 lists the specifications for the Regulators . Thefollowing information is stamped on the regulator at thefactory: type number, date of manufacture, spring range,and seat ring port injury or system damage may resultif this regulator is installed, without appropri-ate overpressure protection, where service con-ditions could exceed the limits shown in tables1-4 for a given construction. Regulator instal-lations should be adequately protected fromphysical vents should be kept open to permit freeflow of gas to the atmosphere. Protect open-ings against entrance of rain, snow, insects, orany other foreign material that may plug thevent or vent line.

3 On outdoor installations, pointthe spring case vent downward to allow con-densate to drain. This minimizes the possibil-ity of freezing and of water or other foreignmaterials entering the vent and interfering withproper S301 and S3022 STARTUPBODY SIZES ANDNPT screwed inlet and outletEND CONNECTION1-1/4 x 1-1/4 inch n 1-1/2 x 1-1/2 STYLE inch n 2 x 2 inch,2 inch ANSI 125 lb. R. F. flangeMAXIMUMSee table 2 ALLOWABLE INLETPRESSURESMAXIMUM15 psig (Spring case pressure)EMERGENCYOUTLET PRESSUREMAXIMUM3 psi above outlet settingALLOWABLEOUTLET PRESSURESEAT RING5/32 x 3/16, 3/16,DIAMETERS7/32 x 1/4, 1/4,7/32 x 3/8, 3/8, 1/2,3/4, and 3/4 x 7/8 inchesTEMPERATURE-20 to +170 F (-29 to 77 C)CAPABILITIESPRESSUREI nternalREGISTRATIONAPPROXIMATE9 pounds ( kg)WEIGHTU nder enclosed conditions or indoors, escap-ing gas may accumulate and be an explosionhazard. In these cases, the vent should bepiped away from the regulator to the most Regulators , S301 series regulatorshave an outlet pressure rating lower than theirinlet pressure rating.

4 If actual inlet pressure canexceed the outlet pressure rating, outlet over-pressure protection is necessary. However,overpressuring any portion of the regulatorsbeyond the limits in tables 2 and 3 may causeleakage, damage to regulator parts, or personalinjury due to bursting of type of external overpressure protectionshould be provided if inlet pressure will be highenough to damage downstream methods of external overpressureprotection include relief valves, monitoringregulators, shutoff devices, and series regulator is exposed to an overpressure con-dition, it should be inspected for any damagethat may have occurred. Regulator operationbelow these limits does not preclude the pos-sibility of damage from external sources or fromdebris in the installing the regulator, check for damage whichmight have occurred in shipment.

5 Also check for dirt orforeign matter which may have accumulated in the regulatorbody or in the pipeline. Apply pipe compound to the malethreads of the pipeline and install the regulator so thatflow is in the direction of the arrow cast on the body. Thediaphragm casing assembly can be rotated to any positionrelative to the body. Loosen the two cap screws (key 28,figure 3) in order to rotate the diaphragm casing not install the regulator in a location where there canbe excessive water accumulation, such as directly beneatha down the regulator is used in conjunction with a 289H reliefvalve, the Type 289H should be set 10" higher thanthe outlet pressure setting of the regulator, up to 30 reduced pressure. For pressure greater than this,set the 289H 3/4 psi higher than the outlet pressuresetting of the Type S301 and s302 Regulators have 1-inch NPTscreened vent openings in the spring case.

6 If necessaryto vent escaping gas away from the regulator, install aremote vent line in the spring case tapping. Vent pipingshould be as short and direct as possible with a minimumnumber of bends and elbows. The remote vent line shouldhave the largest practical diameter. Vent piping onregulators with internal relief ( s302 & S302H) must belarge enough to vent all relief valve discharge toatmosphere without excessive back pressure and resultingexcessive pressure in the check all vent openings to be sure that theyare not outlet pressure settings are shown in table pressure more than 3 psi above the set point maydamage internal parts such as the diaphragm head andvalve disk. The maximum emergency (casing) outletpressure is 15 gauges should always be used to monitordownstream pressure during Check to see that all appliances are turned Slowly open the upstream plug Check all connections for Light the appliance 1.

7 SpecificationsType S301 and S3023 PRINCIPAL OF 61 4 8 *teltuOmumixaM203S&103S)rabillim07(. "82H103S)rabillim255(gisp8H203S)rabillim 702(gisp3*roferusserp)gnisac( , , increase the outlet pressure setting of the regulator,the adjusting screw (key 3, figure 3) must be turnedclockwise. This requires removal of the closing cap (key4). To reduce the outlet pressure setting, turn the adjustingscrew counterclockwise. A pressure gauge should alwaysbe used to monitor downstream pressure whileadjustments are being made. Do not adjust the spring toproduce an outlet pressure setting above the limit stampedon the closing cap. If the required pressure setting is notwithin the range of the spring being used, substitute withthe correct spring, see table 4. (Note: High pressure springsof 1 psig or more cannot be used in the low pressureregulators.) When changing the spring, also change therange stamped on the closing cap to indicate the actualpressure range of the spring in use.

8 After the springadjustment has been completed, replace the closing arrangements may vary, but in any installationit is important that the valves be opened or closed slowlyand that the outlet pressure be vented before venting inletpressure to prevent damage caused by reversepressurization of the regulator. The steps below apply tothe typical installation as Open valves downstream of the Slowly close the upstream shutoff Inlet pressure will automatically be released downstreamas the regulator opens in response to the lowered pressureon the to figure 2. When downstream demand decreases,the pressure under the diaphragm increases. This pressureovercomes the regulator setting (which is set by a spring).Through the action of the pusher post assembly, the valvedisk moves closer to the seat ring and reduces gas flow. Ifdemand downstream increases, pressure under thediaphragm decreases.

9 Spring force pushes the pusher postassembly downward, the valve disk moves away from theseat ring, and the gas flow Type s302 and S302H Regulators include an internalrelief valve for overpressure protection. If the downstreampressure exceeds the regulator setting by 7 inches 1 psig (depending on the main spring used), the reliefvalve opens and excess gas is vented through the stabilizervent in the upper spring avoid personal injury or equipment damage,do not attempt any maintenance or disassemblywithout first isolating the regulator from system pres-sure and relieving all internal pressure as de-scribed in Shutdown . Regulators that have been disassembled for re-pair must be tested for proper operation beforebeing returned to service. Only parts manufacturedby Fisher should be used for repairing Fisher regu-lators. Relight pilot lights according to normalstartup to normal wear or damage that may occurfrom external sources, this regulator should be in-spected and maintained periodically.

10 The fre-quency of inspection and replacement ofType S301 and S3024 ORDERING PARTS parts depends upon the severity of service condi-tions or the requirements of local, state, and fed-eral rules and to Replace DiaphragmRefer to figure 3. 1. Remove closing cap (key 4) and adjusting screw (key 3). 2. Take out the spring case screws and lift the spring case(key 1) and spring (key 2) off the lower casing (key 10). 3. Lift the diaphragm assembly slightly so that the pusherpost (key 7) can release the valve lever (key 14). 4. On S301 s, remove the screw (key 9); on s302 s, removethe relief valve stem (key 30). 5. The diaphragm can be disassembled by removing thespring seat (key 6). 6. Reassemble in the reverse order of the above tightening the screw (key 9) or relief valve stem (key30) into the pusher post (key 7) to secure the new diaphragm,place the loosely assembled diaphragm and head unit intoposition in the lower casing (key 10), being sure the pusherpost is properly hooked on the lever (key 14).