Emerson 66R Data Sheet
Contents
1. 1024 1067 1179 1286 1380 1576 1 5 psig 45000 46000 47200 50000 54000 56000 59900 62000 9119 0 10 1206 1233 1265 1340 1447 1501 1605 1662 2 psig 51000 52000 53300 56000 59500 62000 64000 66000 72000 9 0 14 bar 1367 1394 1428 1501 1595 1662 1715 1769 1930 5 w c 25500 30000 33600 36900 45400 12 mbar 683 804 900 989 1217 275 7777 2270 Cadmium 10 35100 38200 41300 43800 52600 59800 PON 27 25 941 2 1024 1107 1174 1410 1603 14 inches 41 300 43800 46500 49000 56700 66500 70600 35 mbar 1107 2 1174 1246 1313 1520 1782 1892 7777 eee 7777 100 1 psig 57400 59300 62000 63200 65000 67700 77800 90000 a 9119 0 07 bar 1538 2 1589 1662 1694 1742 1814 2085 2412 1 5 psig ers 64400 66900 67900 69500 72000 86000 93000 96000 91 9 0 10 1726 1793 1820 1863 1930 2305 2492 2573 2 psig 69500 72000 73000 74600 77000 90000 95000 100000 110000 9 0 14 bar 1863 1930 1956 1999 2064 2412 2546 2680 2948 1 See Capacity Information section for conversion to equivalent capacities2. CONTROL LINE BJ8921 C A2562 GAS TO FUEL SYSTEM Figure 5 Type 66R Relief Valve Installation at Outlet of Sewage Treatment Plant Digester Tank ATMOSPHERE ONLY INTO DIAPHRAGM CASE VENT POSITIVE PRESSURE OR ATMOSPHERE BEING LIMITED j VACUUM PUMP OR A LESSER VACUUM Aaa THAN THE VACUUM BEING LIMITED Figure 6 Type 66RR Relief Valve Installation Vacuum Breaker System Installation A Type 66R or 66RR relief valve should be installed horizontally with the diaphragm casings vertical above the body Other orientations will change the relief set pressure and set pressure range due to the weight of the internal parts Typical installations are shown in Figures 5 and 6 Connection locations and dimensions are both shown in Figure 7 Capacity Information Table 4 gives Type 66R and Table 5 gives Type 66RR flow capacities at selected set pressures Flows are in SCFH 60 F and 14 7 psia of 0 6 specific gravity natural gas at 60 F To determine the equivalent capacities for air propane butane or nitrogen multiply the Table 4 or 5 capacity by the following appropriate conversion factor 0 775 for air 0 628 for propane 0 548 for butane or 0 789 for nitrogen For gases of other specific gravities multiply the given capacity by 0 775 and divide by the square root of the appropriate specific gravity Then if capacity is desired in normal cubic meters per hour Nm3 h at 0 C and 1 01325 bar multiply SCFH
3. Standard 11 inches w c to 1 psig 27 mbar to 0 07 bar 1D765627032 Green Stripe 0 177 4 50 6 00 152 2 50 0 75 to 1 5 psig 0 05 to 0 10 bar 1D765727032 Red Stripe 0 207 5 26 6 09 155 1 to 2 psig 0 07 to 0 14 bar 1D765827032 Unpainted 0 225 5 72 6 00 152 Special 1 5 to 3 psig 0 10 to 0 21 bar 1D962627032 Unpainted 0 262 6 66 6 25 159 3 to 5 psig 0 21 to 0 34 bar 1N506427142 Black Stripe 0 283 7 19 6 31 160 2 to 8 inches w c 5 to 20 mbar 1D770727012 Olive Green Stripe 0 135 3 43 6 00 152 6 to 16 inches w c 15 to 40 mbar 1D770827032 Red and Yellow Stripe 0 162 4 12 6 00 152 Standard 11 inches w c to 1 psig 27 mbar to 0 07 bar 1D765727032 Red Stripe 0 207 5 26 6 09 155 3 80 0 75 to 1 5 psig 0 05 to 0 10 bar 1D765827032 Unpainted 0 225 5 72 6 00 152 1 to 2 psig 0 07 to 0 14 bar 1D770927032 Blue and Yellow Stripe 0 283 7 19 6 06 154 Special 1 5 to 3 psig 0 10 to 0 21 bar 1E204427032 White and Red Stripe 0 306 7 77 6 38 162 3 to 5 psig 0 21 to 0 34 bar 1N506527142 Brown and Purple Stripe 0 363 9 22 6 38 162 2 to 8 inches w c 5 to 20 mbar 10771027012 Orange and Yellow Stripe 0 135 3 43 7 75 197 6 to 16 inches w c 15 to 40 mbar 1D771127032 Light Blue Stripe 0 177 4 50 7 94 202 Standard 11 inches w c to 1 psig 27 mbar to 0 07 bar 1D527627032 Gray and White Stripe 0 225 5 72 7 75 197 4 100 0 75 to 1 5 psig 0 05 to 0 10 bar 1D771227032 Pink and Blue Stripe 0 262
4. 0 5 0 03 0 75 0 05 1 0 07 1 5 0 10 2 0 14 3 0 21 5 inches w c 3300 8500 9500 10 000 12 mbar 88 4 228 2 255 268 95 2777 10 w c 7300 10 800 12 000 15 300 25 7157 196 289 322 2 410 5 2 a 14 inches w c 8200 15 000 16 800 18500 2 1005041092 35 mbar 5 220 402 2 450 496 1 psig 16 700 18500 20000 24000 10765727032 0 07 2777 7 448 496 0 536 643 7517 1 5 psig 15000 21000 24000 26000 29000 10769821032 0 10 bar RER 5 402 563 643 2 697 777 2 psig 22 2 17 000 23000 29000 31000 35 000 10962627034 0 14 bar 456 616 777 2 831 938 5 inches w c 5500 18500 20000 22 000 27 000 107707270121 12 147 4gey2 536 ew 724 777 7777 7777 10 w c 11800 21500 26 000 31000 34000 25 mbar 316 576 697 2 831 911 14 w c 11 500 17 500 33000 36000 40000 10765127032 35 mbar 2707 308 469 8840 965 1072 lt 3 80 1 psig 79 55 15 000 29000 41000 46000 52000 ____ 19769827032 0 07 bar 402 777 1099 1233 1394 1 5 psig 18000 30000 44000 57000 62000 10170341032 0 10 bar 7777 7777 5 482 804 1179 1528 2 1662 2 psig 27000 39000 60000 67000 76000 1 204427
5. Process Management Regulator Technologies Inc 1981 2009 All Rights Reserved Process Mana gemen t
6. by 0 0268 Bulletin 71 4 66 lt gt A 1 1 om mm mm i _ gt 3 4 NPT A CONTROL LINE WHEN USED pey ww pey lt 2 gt A _ gt TYPE 66R lt F gt 1 4 PILOT 3 69 N EXHAUST 94 D gt m 241 227 uo D 2 1 2 CONTROL LINE E CONNECTION Ge mn m mir 7981298 Uy poy poy poy G Y 2 gt lt gt INCHES 7 lt gt 21A9672A mm B1410 TYPE 66RR WITH TYPE Y695RR PILOT A CL125 FF D F BODY Cast NPT Cast Iron CL300 RF TYPE 66RR TYPE 66RR NPT All SIZE Steel or CL150 Steel 66R 66RR ONLY 66R 66RR oni Steel Iron Y Others NPS DN Bod Body RF Steel Body Body y Body Inch mm Inch Inch mm Inch mm Inch mm Inch mm Inch mm Inch mm Inch mm Inch mm
7. for Type 66RR NPS 3 DN 80 Body 100 pounds 45 kg for Type 66R or 115 pounds 52 kg for Type 66RR NPS 4 DN 100 Body 155 pounds 70 kg for Type 66R or 170 pounds 77 kg for Type 66RR PILOT CONTROL SPRING DIAPHRAGM O RING RETAINER STEM GUIDE O RING M1041 VALVE PLUG SKIRT STANDARD TYPE 66R RELIEF VALVE WITH INTERNAL REGISTRATION E INLET CONTROLLED PRESSURE OUTLET PRESSURE ATMOSPHERIC PRESSURE LOADING PRESSURE Figure 2 Operational Schematics Bulletin 71 4 66 Options Special springs and other internal parts for Type 66R set pressures from 1 5 to 5 psig 0 10 to 0 34 bar and Type 66RR set pressures from 3 8 to 7 psig 0 01 to 0 48 bar control line connection for cast iron Type 66R all metal seats for NPS 2 DN 50 cast iron Type 66R FIXED RESTRICTION PILOT VALVE DISK TYPE Y695RR PILOT MAIN VALVE DIAPHRAGM VALVE STEM VALVE PLUG SKIRT MAIN VALVE TYPE 66RR RELIEF VALVE Bulletin 71 4 66 Table 1 Spring Selection for Type 66R Relief Set Pressure Ranges BODY SPRING SIZE CONSTRUCTION RELIEF SET PRESSURE RANGE PART SPRING COLOR NPS DN NUMBER DIAMETER LENGTH INCHES mm INCHES mm 2 to 8 inches w c 5 to 20 mbar 1D765427012 Pink Stripe 0 120 3 05 6 00 152 6 to 16 inches w c 15 to 40 mbar 1D765527012 Blue Stripe 0 138 3 51 6 00 152
8. 0 07 1 5 0 10 2 0 14 3 0 21 Red 5 inches w c 6200 7300 8250 9000 11 600 12 mbar 166 2 196 221 241 311 7777 7777 7777 Cadmium 10 inches w c 8750 9550 10200 10800 13000 15100 25 mbar 235 256 273 289 348 405 2555 Yellow t4inchesw c 10300 11100 11700 12400 14300 16100 17900 27 35 mbar 276 2 297 314 332 383 431 480 1 psig 14400 15200 15700 16100 17700 19200 20600 23200 gm green 9 07 bar 386 2 407 421 431 474 515 552 622 aa 1 5 psig a 18000 18500 19000 20500 22000 23500 26000 28000 _ 9119 0 10 482 496 509 549 590 630 697 750 2 psig KAN 20000 20500 21000 22500 24000 25500 28000 30000 33000 9 0 14 bar 536 549 563 603 643 683 750 804 884 5 15 700 18600 21200 23000 29400 12 mbar 421 0 498 568 616 788 10 inches 22700 24800 26600 28400 34000 38700 25 mbar 608 2 665 713 761 911 1037 7777 277 Yellow 14 16100 28200 29700 31500 36400 42000 45500 ____ 35 mbar 431 0 756 796 844 976 1126 1219 eee 1 psig 35600 37200 38200 39800 44000 48000 51500 58800 9119 0 07 954 2 997
9. 032 0 14 bar 2722 50 5 724 1045 1608 1796 0 2037 5 inches w c 10300 28000 32000 34 000 41 000 12 mbar 276 750 2 858 911 1099 7777 17 4 5 10 w c 22000 36000 39 000 46000 52000 25 590 965 1045 2 1233 1394 5 2777 14 inches w c 24 000 35 000 50000 55000 61000 ei 1527621092 35 mbar aa 643 938 1340 2 1474 1635 7275 1 psig 21 000 50000 65000 70000 78000 20082 0 07 772 TS 563 1340 1742 2 1876 2090 1 5 psig soe 36000 60000 78000 86000 95000 1771321032 0 10 bar 965 1608 2090 2305 2 2546 2 psig 40000 60000 90000 102000 115 000 0 14 5 ee 0 1072 1608 2412 2734 2 3082 1 See Capacity Information section for conversion to equivalent capacities of other gases and or normal cubic meters per hour 2 Valve wide open Bulletin 71 4 66 Table 5 Selected Type 66RR Relief Capacities in SCFH Nm h of 0 6 Specific Gravity Natural Gas TYPE BUILD UP OVER RELIEF SET PRESSURE Y695RR RELIEF BODY SIZE PILOT SET Inches w c mbar Psig bar NPS DN CONTROL PRESSURE SPRING 1 2 3 7 5 12 0 25 0 02 0 5 0 03 0 75 0 05 1
10. 6 66 7 75 197 1 to 2 psig 0 07 to 0 14 bar 1D771327032 Silver Stripe 0 283 7 19 7 75 197 Special 1 5 to 3 psig 0 10 to 0 21 bar 1E204527032 Pink Stripe 0 331 8 41 7 53 191 Table 2 Type Y695RR Pilot Control Spring Selection PILOT CONTROL SPRING CONSTRUCTION RELIEF SET PRESSURE RANGE Numba ColorCode Wire Diameter Free Length Inches mm Inches mm 4 to 9 inches w c 10 to 22 mbar 1 1B653827052 Red 0 085 2 16 3 625 92 1 5 to 15 inches w c 12 to 37 mbar 1 1B653927022 Cadmium 0 105 2 67 3 750 95 3 Standard 12 to 28 inches w c 30 to 70 mbar 1 1B537027052 Yellow 0 114 2 90 4 188 106 0 9 to 2 5 psig 0 06 to 0 17 bar 1B537127022 Light green 0 156 3 96 4 060 103 1 3 to 4 5 psig 0 09 to 0 31 bar 1B537227022 Light blue 0 187 4 75 3 938 100 Special 3 8 to 7 psig 0 26 to 0 48 bar 1B537327052 Black 0 218 5 54 3 980 101 1 Published ranges are with the spring case pointed up Principle of Operation Type 66R Relief Valve Inlet pressure registers under the diaphragm and is opposed by the spring Figure 2 When the inlet pressure increases above the spring setting the valve plug opens in a throttling manner and relieves the inlet pressure As inlet pressure drops back to set pressure the spring closes the valve plug Type 66RR Relief Valve Inlet pressure registers on the bottom of the pilot diaphragm through the upstream control line and bleeds through a fixed restric
11. Bulletin 71 4 66 November 2009 Types 66R and 66RR Low Pressure Relief Valves 1953 66 RELIEF VALVE Figure 1 Typical Constructions Introduction Types 66R and 66RR low pressure throttling relief valves are used to help protect a system against overpressure or to maintain an inlet or backpressure The standard Type 66R direct operated construction is used for 2 inches w c to 2 psig 5 mbar to 0 14 bar set pressure ranges while the standard Type 66RR pilot operated construction with Type Y695RR pilot is used for 4 inches w c to 4 5 psig 10 mbar to 0 31 bar set pressure ranges However higher set pressure ranges are available with optional springs diaphragm plates and other internal parts Standard Type 66R relief valves have internal registration through a stem guide Figure 2 that reduces the need for control line piping while cast iron body Type 66R relief valves additionally are available with a sealing diaphragm and a tapped connection boss on the diaphragm case for external registration that requires a separate control line All Type 66RR relief valves come standard with internal registration in the main valve body and tapped connection bosses on the pilot casings for external registration that requires a separate control line TYPE 66RR RELIEF VALVE Features Seat Protection without Sacrifice in Shutoff Capability Retainer Figure 2 in standard valve plug assembly closes against sea
12. Inch Inch 2 50 7 25 184 9 25 235 10 00 254 10 50 267 13 88 353 22 12 562 4 50 114 11 75 298 12 69 322 15 19 386 3 31 84 3 25 83 3 80 11 75 298 16 00 406 24 19 614 5 50 140 13 00 330 14 12 359 16 19 411 4 62 117 4 100 13 88 353 18 00 457 25 94 659 6 25 159 15 88 403 15 25 387 16 94 430 5 38 137 Figure 7 Dimensions Bulletin 71 4 66 Ordering Information When ordering specify Application 1 Composition and specific gravity of gas including chemical analysis if possible 2 Range of temperatures flowing inlet pressures maximum minimum nominal and pressure drops 3 Desired relief set pressure or set pressure range Ordering Guide Type Select One 66R maximum inlet pressure 8 psig 0 55 bar 66RR maximum inlet pressure 10 psig 0 69 bar Body Size Select One NPS 2 DN 50 NPS 3 DN 80 NPS 4 DN 100 Body Material and End Connection Style Select One Cast Iron NPT 2 inch only CL125 FF Steel NPT 2 inch only CL150 RF CL300 RF PN 16 25 40 Main Valve Diaphragm Case Material Select One Steel 304 Stainless steel 4 Range of flow rates minimum controlled maximum normal 5 Piping size s Construction Re
13. fer to the page 2 Specification section and to each referenced table specify the desired selection whenever there is a choice to be made Always be sure to specify the relief valve type number Main Valve Diaphragm Valve Plug and O ring Select One Nitrile NBR Flourocarbon FKM Optional Polytetrafluoroethylene PTFE Diaphragm Protector Select kkk Yes Seat Ring Material Select One kkk Bronze 316 Pilot Body Material Select One for Type 66RR Only kkk Cast Iron CF8M Stainless steel Pilot Diaphragm and Disk Select One for Type 66RR Only Nitrile NBR O Fluorocarbon FKM continued Ordering Guide continued Set Pressure Ranges Select One Type 66R 2 to 8 inches w c 5 to 20 mbar 6 to 16 inches w c 15 to 40 mbar 11 inches w c to 1 psig 27 to 69 mbar 0 75 to 1 5 psig 52 to 103 mbar 1 to 2 psig 69 to 138 mbar 1 5 to 3 psig 103 to 207 mbar 3 to 5 psig 207 to 345 mbar Type 66RR 4 to 9 inches w c 10 to 22 mbar Red 5 to 15 inches w c 12 to 37 mbar Cadmium 12 to 28 inches w c 30 to 70 mbar Yellow 0 9 to 2 5 psig 62 to 172 mbar Light Green 1 3 to 4 5 psig 90 to 310 mbar Light Blue 3 8 to 7 psig 262 to 483 mbar Black Replacement Pa
14. m Only Stainless steel Diaphragm Nitrile NBR standard or Fluorocarbon FKM high temperature Lower Spring Seat Zinc plated steel Back Disk Spring Stainless steel Pressure Setting Spring Zinc plated or cadmium plated steel Orifice and Disk Holder Stainless steel Disk Nitrile NBR standard or Fluorocarbon FKM high temperature Valve Stem Stainless steel Pusher Post Stainless steel Lever Assembly Stainless steel Mounting Bar Fittings and Bolting Steel Temperature Capabilities Standard Elastomers 20 to 180 F 29 to 82 C High Temperature Elastomers 0 to 350 F 18 to 177 C IEC Sizing Coefficient See Table 3 Pressure Registration Type 66R Internal standard or external Type 66RR External on pilot and internal in main valve Pressure Connections Type 66R Control Line if used 3 4 NPT standard Spring Case Vent 3 4 NPT standard with removable Type Y602 10 vent assembly Type 66RR Pilot Body 3 4 NPT standard Pilot Lower Casing Assembly 1 2 NPT standard Pilot Spring Case 1 2 NPT standard 1 The pressure temperature limits in this Bulletin and any applicable ASME standard should not be exceeded 2 Monel is a mark owned by Special Metals Corporation continued Specifications continued Approximate Weights NPS 2 DN 50 Body NPT 50 pounds 23 kg for Type 66R or 65 pounds 29 kg for Type 66RR Flanged Ends 55 pounds 25 kg for Type 66R or 70 pounds 32 kg
15. m Relief Inlet 1 Type 66R 8 psig 0 55 bar including build up Type 66RR 10 psig 0 69 bar including build up Standard Relief Set Pressure Ranges Type 66R See Table 1 Type 66RR See Table 2 Orifice Sizes NPS 2 DN 50 Body 2 inch 51 mm NPS 3 DN 80 Body 3 inch 76 mm NPS 4 DN 100 Body 4 inch 102 mm Typical Performance Curves See Figures 3 and 4 Relief Capacities See Tables 4 and 5 Construction Materials Complete Relief Valve Type 66R or Main Valve Type 66RR Body and Body Piping Cast iron standard or steel Spring Case Steel Diaphragm Case Diaphragm Plates Bottom Flange Spring and Bolting Plated Steel Diaphragm Spacer when Used Zinc plated steel Diaphragms and Valve Plug O Ring and Spring Case Gasket when Used Nitrile NBR standard or Fluorocarbon FKM high temperature Bottom Flange and Stem Gaskets Composition Diaphragm Case and Closing Cap Gaskets Neoprene CR Sealing Washer and Spring Case Drive Screw when Used Carbon steel Type Y602 10 Vent Assembly when Used Zinc stainless steel Monel Snap Ring when Used Bronze Closing Cap Adjusting Screw and Spring Seats Zinc Flapper Valve when Used Brass Seat Ring Bronze standard or stainless steel Type Y695RR Pilot and Mounting Parts Type 66RR Only Body Ductile iron standard or steel Spring Case Cast iron Lower Casing Assembly Cast iron and stainless steel Lower Diaphragm Plate Stainless Steel Tri
16. of other gases and or normal cubic meters per hour Shaded capacities are approximate 2 Valve wide open Bulletin 71 4 66 EP ETT on 100 E 4 INLET PRESSURE PSIG INLET PRESSURE bar 0 8 16 24 32 40 48 56 64 72 80 88 0 2 0 4 0 6 0 9 1 1 1 3 1 5 1 7 1 9 2 1 2 4 FLOW IN THOUSANDS OF 5 3 OF 0 6 SPECIFIC GRAVITY NATURAL GAS 9212 2561 NOTE SEE CAPACITY INFORMATION SECTION FOR CONVERSION TO EQUIVALENT CAPACITIES OF OTHER GASES AND OR CUBIC METERS PER HOUR EACH CURVE REPRESENTS A DIFFERENT BODY SIZE AS MARKED ALL MEASUREMENTS MADE AT 1 PSIG 0 07 bar RELIEF SET PRESSURE Figure 3 Typical Performance Curves for Standard Type 66R Relief Valve DN 100 TYPE 66R INLET PRESSURE INCHES W C INLET PRESSURE mbar NPS 4 DN 100 TYPE 66RR 0 5 1 0 1 4 1 9 FLOW RATE IN THOUSANDS OF SCFH Nm3 h OF 0 6 SPECIFIC GRAVITY NATURAL GAS NOTE SEE CAPACITY INFORMATION SECTION FOR CONVERSION TO EQUIVALENT CAPACITIES OF OTHER GASES AND OR CUBIC METERS PER HOUR EACH CURVE REPRESENTS A DIFFERENT BODY SIZE AS MARKED ALL MEASUREMENTS MADE AT 14 INCHES W C 35 mbar RELIEF SET PRESSURE ADDITIONALLY TYPE 66RR MAIN VALVE SPRING SET AT 2 INCHES W C 5 mbar A0902 1 Figure 4 Typical Performance Curves for NPS 4 DN 100 Types 66R and 66RR Relief Valves Bulletin 71 4 66
17. rts Kit Optional Yes send one replacement parts kit to match this order Regulators Quick Order Guide Readily Available for Shipment Allow Additional Time for Shipment Special Order Constructed from Non Stoacked Parts Consult your local Sales Office for Availability Availability of the product being ordered is determined by the component with the longest shipping time for the requested construction Bulletin 71 4 66 Specification Worksheet Application Specific Use Line Size Gas Type and Specific Gravity Gas Temperature Relief Valve Size Brand of upstream regulator Orifice size of the upstream regulator Wide open coefficient of the upstream regulator Pressure Maximum Inlet Pressure maximum Inlet Pressure Downstream Pressure Setting s P2 Maximum Flow Qmax Performance Required Accuracy Requirements Need for Extremely Fast Response Other requirements Bulletin 71 4 66 Industrial Regulators Emerson Process Management Regulator Technologies Inc USA Headquarters McKinney Texas 75069 1872 USA Tel 1 800 558 5853 Outside U S 1 972 548 3574 Asia Pacific Shanghai China 201206 Tel 86 21 2892 9000 Europe Bologna Italy 40013 Tel 39 051 4190611 Middle East and Africa Dubai United Arab Emirates Tel 971 4811 8100 Natural Gas Technologies Emerson Process Managemen
18. t Regulator Technologies Inc USA Headquarters McKinney Texas 75069 1872 USA Tel 1 800 558 5853 Outside U S 1 972 548 3574 Asia Pacific Singapore Singapore 128461 Tel 65 6777 8211 Europe Bologna Italy 40013 Tel 39 051 4190611 Gallardon France 28320 Tel 33 0 2 37 33 47 00 TESCOM Emerson Process Management Tescom Corporation USA Headquarters Elk River Minnesota 55330 2445 USA Tel 1 763 241 3238 Europe Selmsdorf Germany 23923 Tel 49 0 38823 31 0 For further information visit www fisherregulators com The Emerson logo is a trademark and service mark of Emerson Electric Co All other marks are the property of their prospective owners Fisher is a mark owned by Fisher Controls Inc a business of Emerson Process Management The contents of this publication are presented for informational purposes only and while every effort has been made to ensure their accuracy they are not to be construed as warranties or guarantees express or implied regarding the products or services described herein or their use or applicability We reserve the right to modify or improve the designs or specifications of such products at any time without notice Emerson Process Management does not assume responsibility for the selection use or maintenance of any product Responsibility for proper selection use and maintenance of any Emerson Process Management product remains solely with the purchaser EMERSON Emerson
19. t ring before assembly can overtravel and thus overcompress O ring e Application Flexibility Steel bodies are available for increased resistance to piping stresses or whenever dictated by local codes External registration is optional with all cast iron bodies for wherever a remote control line is required These relief valves can be used for vacuum service in both standard and special versions since vacuum service capacity is comparable with relief service capacity Severe Service Capability Fluorocarbon FKM soft parts and stainless steel metal trim parts are available for high temperatures and or special gases Optional all metal seats lessen O ring seat erosion problems with coke gas or other corrosive applications and have knife edged guides on their valve plug skirts to help prevent particle accumulation with dirty service 1 Throttling relief valve defined in ANSI standard B95 1 1972 Not all codes or regulations permit these valves to be used as final overpressure protection devices www fisherregulators com EMERSON Process Management D100152x012 Bulletin 71 4 66 Specifications Body Sizes and End Connection Styles END CONNECTION NOMINAL STYLES AND RATINGS TYPES BODY SIZE NPS DN Standard Cast Optional Steel Iron Body Body NPT CL150 RF NPT or i 66 2150 CL125 FF flanged 874 CL300 RF 66RR flanged 3 4 80 100 CL125 FF flanged CL150 RF flanged Maximu
20. tion in the pilot Figure 2 to provide loading pressure that helps the main valve spring keep the main valve plug tightly shutoff When inlet pressure exceeds the setting of the pilot spring the pilot diaphragm moves upward opening the pilot valve disk and relieving some of the pressure from the top of the main valve diaphragm At the same time the inlet pressure increase registers on the bottom of the main valve diaphragm The pressure differential acting on the main valve diaphragm moves this diaphragm upward opening the main valve Further increases in inlet pressure continue to open the pilot valve disk and the main valve plug When inlet pressure returns to the pilot control spring setting the pilot disk closes allowing inlet pressure to load the top of the main valve diaphragm through the fixed restriction This equalizes the pressures acting on this diaphragm and the main valve spring closes the main valve plug Table 3 IEC Sizing Coefficients Bulletin 71 4 66 BODY SIZE NPS DN Xr Fp FL Km 2 50 0 35 3 80 0 78 0 34 0 89 0 79 4 100 0 30 Table 4 Selected 66R Relief Capacities in Nm h of 0 6 Specific Gravity Natural Gas SPRING RELIEF BUILD UP OVER RELIEF SET PRESSURE BODY SIZE PART SET Inches w c mbar Psig bar NES DN NUMBER PRESSURE 1 2 3 7 5 12 0 25 0 02
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