Emerson 92B Data Sheet
Contents
1. INLET OUTLET PRESSURE PRESSURE CAPACITIES IN Ib h kg h OF SATURATED STEAM BASED ON 10 PERCENT DROOP Body Size psig bar psig bar NPS 1 DN 25 NPS 1 1 2 DN 40 NPS 2 DN 50 NPS 3 DN 80 NPS 4 DN 100 5 4 660 299 1060 481 2060 934 3800 1724 4940 2241 25 17 10 9 600 272 1080 490 2080 943 3850 1746 5000 2268 15 10 525 238 935 424 1860 844 3260 1479 4520 2050 5 034 1080 490 1830 830 3300 1497 6500 2948 8960 4064 10 0 69 1080 490 1890 857 3390 1538 6650 3016 9110 4132 50 34 20 14 1080 490 1860 844 3290 1492 6500 2948 8810 3996 30 24 928 421 1760 798 2940 1334 5740 2604 7730 3506 40 28 710 322 1660 753 2590 1175 4980 2259 6650 3016 5 4 10 680 2510 1138 4610 2091 9080 4119 10 900 4944 10 0 69 1500 680 2620 1188 4700 2132 9180 4164 11 200 5080 20 14 1500 680 2720 1234 4770 2164 9290 4214 11 300 5126 75 52 30 24 1470 667 2680 1216 4680 2123 8880 4028 10 800 4899 40 28 1380 626 2640 1198 4590 2082 8470 3842 10 200 4627 50 34 1240 562 2380 1080 4370 1982 7680 3484 9240 4191 60 4 1 1020 463 2120 962 4160 1887 6900 3130 8280 3756 5 0 34 1900 862 3400 1542 5710 2590 11 500 5216 16 100 7303 10 0 69 1920 871 3440 1560 5870 2663 11 700 5307 16 400 7439 20 14 1920 871 3460 1569 5900 2676 11 800 5352 16 400 7439 100 6 9 40 28 1920 871 3500 1588 5930 2690 11 800 5352 16 500 7484 60 44 1700 771 3330 1510 5650 2563 11 000 4990 15 200 6895 80 55 1330 603 2860 1297 4962. Green 13 to 25 psig 0 90 to 1 7 bar Black continued Ordering Guide continued High Temperature 15 to 100 psig 1 0 to 6 9 bar Unpainted 80 to 250 psig 5 5 to 17 2 bar Unpainted Pilot Mounting Position Select One Facing inlet side of main valve with diaphragm case up pilot is mounted O On left side with pilot adjusting screw pointed up On right side with pilot adjusting screw pointed up Options Select One O Standard Adjusting Screw Sealed Adjusting Screw Handwheel Safety Override System Optional Type 6492HM Pilot Spring Range O 10 to 30 psig 0 69 to 2 1 bar Yellow 25 to 75 psig 1 7 to 5 2 bar Green 70 to 150 psig 4 8 to 10 3 bar Black Regulators Quick Order Guide FE Readily Available for Shipment S Allow Additional Time for Shipment i Special Order Constructed from Non Stocked 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 2 92B Type 6492HTM Pilot Spring Range 15 to 100 psig 1 0 to 6 9 bar Unpainted 80 to 250 psig 5 5 to 17 2 bar Unpainted Main Valve Replacement Parts Kit Optional Yes send one main valve replacement parts kit to match this order Replacement Pil
3. Outlet Casing Pressure Cast iron 150 psig 10 3 bar or body rating limits whichever is lower Steel Stainless steel 300 psig 20 7 bar or body rating limits whichever is lower Outlet Pressure Ranges See Table 2 Flow Coefficients See Table 5 Flow Capacities See Table 6 Pressure Registration External Maximum Temperature Capabilities See Table 3 Downstream Control Line Connections NPS 1 and 1 1 2 DN 25 and 40 1 4 NPT NPS 2 DN 50 3 8 NPT NPS 3 and 4 DN 80 and 100 1 2 NPT Approximate Weights See Table 7 Construction Materials Main Valve Body Bottom Flange Diaphragm Case and Diaphragm Plate Cast iron WCC Steel or CF8M Stainless steel Construction Materials continued Main Valve continued Bottom Flange Gasket Cast iron Composition Steel Stainless steel Graphite Diaphragms Stainless steel Valve Plug 410 or 416 Stainless steel Seat Ring 416 Stainless steel standard 316 Stainless steel seal weld option Valve Plug Guide Bushing 17 4PH Stainless steel Spring 17 7PH Stainless steel or Inconel Bleed Orifice Fitting 416 Stainless steel Pipe Fittings Steel or Stainless steel Type 92B Pilot Mounting Parts Cast iron Copper tubing and brass fittings Steel Body Stainless steel tubing and corrosion resistant steel fittings Stainless steel Body Stainless steel tubing and fittings Type 92B Pilot Body and Spring Case Cast iron WCC steel CF8M Stainless steel Diaphragm Pl
4. valve The Type 6492HM safety override pilot senses pressure downstream of the second valve and prevents pressure from rising above safe operating pressure in the event the downstream valve fails This system is approved by ASME B31 1 1989 122 14 2 A and can replace an ASME safety valve when vent piping is not practical and upstream steam pressure does not exceed 400 psig 27 6 bar Local codes and standards may require approval by an appropriate authority prior to installation Features Extended Diaphragm Service Life Two ply construction and dual flex points increases cycle life compared to conventional designs Stainless Steel material ensures satisfactory operation at high steam temperatures Resilient Seats Valve seats are individually lapped for tight shutoff Beveled seats ensure easy in line lapping Plug and valve seats are constructed of hardened stainless steel which reduces wire drawing in wet steam applications Standard ANSI Face to Face NPT CL 125 FF CL150 RF CL250 RF and CL300 RF end connections are ANSI standard face to face dimensions The Type 92B main valve is also available with PN 16 25 40 RF end connections Bellows Stem Guide Pilot bellows reduces sticking from scale build up due to boiler carryover Inconel is a mark owned by Special Metals Corporation Elevated Actuator Plugging from scale and rust is reduced as condensate will not pool in critical areas Two Path Control Dow
5. 0 NPS 4 DN 100 Steel NPS 1 DN 25 O NPS 1 1 2 DN 40 NPS 2 DN 50 NPS 3 DN 80 NPS 4 DN 100 Stainless steel NPS 1 DN 25 NPS 1 1 2 DN 40 O NPS 2 DN 50 NPS 3 DN 80 NPS 4 DN 100 End Connection Style Select One Cast Iron NPT NPS 1 1 1 2 and 2 CL125 FF Flanged NPS 1 1 2 2 3 and DN 40 50 80 and 100 CL250 RF Flanged NPS 1 1 2 2 3 and 4 DN 40 50 80 and 100 Inconel is a mark owned by Special Metals Corporation Steel NPT NPS 1 1 1 2 and 2 CL 150 RF Flanged CL300 RF Flanged PN 16 25 40 RF NPS 1 1 1 2 2 and 3 DN 25 40 50 and 80 PN 16 RF NPS 4 DN 100 PN 25 40 RF NPS 4 DN 100 Stainless steel NPT NPS 1 1 1 2 and 2 CL 150 RF Flanged CL300 RF Flanged PN 16 25 40 RF NPS 1 1 1 2 2 and 3 DN 25 40 50 and 80 PN 16 RF NPS 4 DN 100 PN 25 40 RF NPS 4 DN 100 Main Valve Spring Select One 17 7PH Stainless steel standard Inconel optional Pilot Material Select One Cast iron Steel O Stainless steel Pilot Type and Spring Range Select One High Pressure 15 to 30 psig 1 0 to 2 1 bar Yellow 25 to 75 psig 1 7 to 5 2 bar Green 70 to 150 psig 4 8 to 10 3 bar Black Low Pressure 2 to 6 psig 0 14 to 0 41 bar Yellow 5 to 15 psig 0 34 to 1 0 bar
6. 0 2250 9670 4386 13 000 5897 5 034 2310 1048 4140 1878 6950 3152 13 900 6305 19 600 8890 10 0 69 2340 1061 4170 1892 7010 3180 14 100 6396 19 800 8981 20 14 2340 1061 4230 1919 7080 3211 14 100 6396 19 800 8981 125 86 40 28 2340 1061 4280 1941 7080 3211 14 200 6441 19 800 8981 60 4 1 2340 1061 4400 1996 7250 3289 14 400 6532 19 800 8981 80 55 2100 952 4100 1860 6750 3062 13 700 6214 18 500 8392 100 6 9 1630 739 3250 1474 5400 2449 11 300 5126 15 600 7076 20 14 2770 1256 5000 2268 8220 3728 16 700 7575 23 600 10 705 40 28 2770 1256 5070 2300 8260 3747 16 700 7575 23 700 10 750 em 60 44 2770 1256 5110 2318 8300 3765 16 800 7620 23 800 10 796 80 55 2770 1256 4980 2259 8130 3688 15 900 7212 23 500 10 660 100 6 9 2360 1070 4600 2086 7740 8511 15 200 6895 21 700 9843 120 83 1950 884 4090 1855 7070 3207 13 700 6214 18 600 8437 20 14 3610 1637 6480 2939 10 700 4854 21 900 9934 29 500 13 381 40 28 3610 1637 6500 2948 10 800 4899 21 900 9934 31 000 14 062 60 44 3610 1637 6520 2957 10 900 4944 22 000 9979 31 200 14 152 200 13 8 80 55 3610 1637 6550 2971 11 000 4990 22 500 10 206 31 300 14 198 100 6 9 3610 1637 6250 2835 10 700 4854 21 700 9843 30 700 13 926 120 8 3 3280 1488 6300 2858 10 500 4763 20 700 9390 29 700 13 472 150 10 3 2790 1266 6070 2753 10 200 4628 19 700 8936 28 300 12 837 1 Printed capacities are for the Type 92B with electropneumatic loading system 11 Bulletin 71 2 92B Table 6
7. 1 2 92B TYPE 92B PILOT C TYPE 92B MAIN VALVE downstream valve fails open downstream pressure will rise above the downstream valve s setpoint This pressure is sensed by the Type 6492HM A safety override pilot As downstream pressure increases the Type 6492HM A safety override pilot closes reducing loading pressure to the upstream main valve which positions the main valve to maintain desired downstream override pressure In the event that the upstream valve fails the downstream valve will prevent downstream pressure from rising above safe operating levels It is recommended to install some type of warning system such as a sentinel relief valve to warn the operator that a valve has failed in the system This will prevent prolonged operation with one valve which could cause valve trim wear and noise associated with operation at high differential pressures Bulletin 71 2 92B Installation Installation of the Type 92B is dependent on the application As a minimum a typical steam pressure reducing station must include a 3 valve bypass inlet drip leg inlet strainer and steam separator if required and relief valve per ASME Section VIII code A safety override pressure reducing station can be installed in the event a relief valve is not practical as per ASME B16 122 14 standards subject to local codes and regulations Positioning and Mounting The Type 92B regulators are intended to be installed with their diaphra
8. 23 200 10 524 31 400 14 243 1 Printed capacities are for the Type 92B with electropneumatic loading system Table 7 Approximate Weights BODY SIZE APPROXIMATE WEIGHTS WITH BODY MATERIAL END CONNECTION STYLES HIGH PRESSURE PILOT NPT 1 1 2 40 73 33 2 50 105 48 1 1 2 40 77 35 2 50 110 50 Cast iron TAS PIE 3 80 175 79 4 100 243 110 1 1 2 40 83 38 2 50 115 52 Chee Re 3 80 190 86 4 100 263 119 1 25 65 29 NPT 1 1 2 40 89 40 2 50 122 55 1 25 77 35 1 1 2 40 95 43 CL150 RF PN 16 RF 2 50 132 60 Steel or Stainless steel 3 80 220 100 4 100 285 129 1 25 82 37 CL300 RF PN 16 25 40 RF 125 40 102 ap PN 25 40 RF 2 30 197 3 80 225 102 4 100 305 138 1 Add 5 Ibs 2 kg for low pressure pilot 12 F DOWNSTREAM CONTROL LINE CONNECTION NPT Bulletin 71 2 92B gt gt lt a 1 2 A gt lt A NPT F DOWNSTREAM CONTROL LINE CONNECTION NPT TY fD t 6 oJ m jp FLANGED Figure 7 Dimensions Table 8 Dimensions BODY DIMENSIONS SIZE A L High CL125 FF CL250 RF G N Low Pressure NPT and and PN 16 RF PN 25 40 RF F Pressure High NPS DN CL150 RF CL300 RF NPT Pilot Temp Pilot In mm In mm In mm In mm In mm In mm In mm In mm In mm In mm In mm 1 25 6 50 165 7 25 184 775 197 7 75 197 7 75 1
9. 97 9 25 235 6 81 173 1 4 3 25 82 6 2 81 71 4 10 25 260 8 38 3 1 1 2 40 8 00 203 8 75 222 9 25 235 9 06 230 9 06 230 10 38 264 7 00 178 1 4 3 81 96 8 3 94 100 10 69 272 8 81 4 2 50 9 25 235 10 00 254 10 50 267 10 25 260 10 25 260 11 88 302 7 75 197 3 8 4 12 105 3 91 99 3 11 25 286 9 38 238 3 80 111 75 298 12 50 317 11 81 300 12 21 310 13 88 353 8 94 227 1 2 5 19 132 5 50 140 12 12 308 10 25 260 4 100 13 88 353 14 50 368 13 56 344 13 88 353 14 88 378 10 12 257 1 2 6 44 164 6 38 162 13 12 333 11 25 286 1 Cast iron flanges are not available for the NPS 1 DN 25 body 2 3 44 in 87 mm NPT bodies 13 Bulletin 71 2 92B Ordering Guide Inlet Steam Conditions Select One lt 125 psig 8 6 bar 353 F 178 C lt 175 psig 12 1 bar 450 F 232 C lt 185 psig 12 8 bar 450 F 232 C psig 17 2 bar 406 F 208 C 250 gt lt 300 psig 20 7 bar 450 F 232 C lt 300 psig 20 7 bar 600 F 316 C Main Valve Body Size and Material Select One Cast Iron O NPS 1 DN 25 NPS 1 1 2 DN 40 NPS 2 DN 50 NPS 3 DN 8
10. Bulletin 71 2 92B September 2014 Type 92B Pressure Reducing Valve Extended Diaphragm Service Life Two Path Control e Elevated Actuator Resilient Seats Bellows Stem Guide Double Post Stem Guide Standard ANSI Face to Face Life Figure 1 Type 92B Pressure Reducing Valve EMERSON Process Management D101342X012 Bulletin 71 2 92B Introduction The Type 92B Pressure Reducing Valve is the standard steam valve for industry The Type 92B is designed to provide decades of continuous service It can withstand dirty operating environments while providing accurate and stable pressure control The Type 92B is applied as a main Pressure Reducing Valve in industrial process heating applications such as heat exchangers evaporators digesters and reactors Commercial applications include Pressure Reducing Valves for meter runs found in district energy systems hot water heat exchangers absorption chillers and boiler deaerator tanks The Type 92B is rated for inlet pressure up to 300 psig 20 7 bar and inlet temperatures to 600 F 316 C Maximum controlled outlet pressure is 250 psig 17 2 bar A large actuator and heavy main spring ensures high accuracy and stability over its entire steam flow range A safety override pilot is available for the Type 92B pressure reducing valve The Type 92B pilot is used in a series installation with the Type 6492HM safety override pilot installed on the upstream
11. Capacities continued INLET OUTLET PRESSURE PRESSURE CAPACITIES IN Ib h kg h OF SATURATED STEAM BASED ON 10 PERCENT DROOP Body Size psig bar psig bar NPS 1 DN 25 NPS 1 1 2 DN 40 NPS 2 DN 50 NPS 3 DN 80 NPS 4 DN 100 20 14 4460 2023 7850 3561 13 000 5897 27 200 12 338 37 300 16 919 40 2 8 4460 2023 7920 3592 13 200 5988 27 300 12 383 37 800 17 146 60 4 1 4460 2023 8100 3674 13 300 6033 27 300 12 383 38 500 17 464 250 172 80 55 4460 2023 8130 3688 13 400 6078 27 400 12 429 38 700 17 554 100 6 9 4460 2023 8150 3697 13 400 6078 27 500 12 474 38 800 17 600 120 8 3 4160 1887 7860 3565 12 700 5761 26 300 11 930 37 000 16 783 150 10 3 4050 1837 6780 3075 11 500 5216 23 000 10 433 31 000 14 062 20 1 4 5190 2354 8810 3996 15 100 6849 31 400 14 243 42 400 19 234 40 2 8 5190 2354 8810 3996 15 100 6849 31 400 14 243 42 400 19 234 60 4 1 5180 2350 8790 3987 15 000 6804 31 400 14 243 42 300 19 187 80 5 5 5150 2336 8740 3964 14 900 6759 31 200 14 152 42 100 19 096 300 210 100 6 9 5110 2318 8670 3933 14 800 6713 30 900 14 016 41 800 18 960 120 83 5040 2286 8550 3878 14 600 6623 30 500 13 835 41 200 18 688 150 10 3 4900 2223 8310 3769 14 200 6441 29 700 13 472 40 000 18 144 175 12 1 4730 2146 8030 3642 13 700 6214 28 600 12 973 38 700 17 554 200 13 8 4510 2046 7650 3470 13 100 5942 27 300 12 383 36 800 16 692 250 172 3830 1737 6510 2953 11 100 5035
12. DIAMETER SPRING FREE LENGTH PILOT TYPE PART NUMBER COLOR CODE psig bar In mm In mm 2106 0 14 to 0 41 0 207 5 26 2 50 63 5 1E395627022 Yellow Low Pressure 5to 15 0 34 to 1 0 0 234 5 94 2 62 66 5 1D7455T0012 Green 13 to 25 0 90 to 1 7 0 283 7 19 2 44 62 0 1E395727192 Black 15 to 30 1 0 to 2 1 0 207 5 26 2 50 63 5 1E395627022 Yellow High Pressure 25 to 75 1 7 to 5 2 0 234 5 94 2 62 66 5 1D7455T0012 Green 70 to 150 4 8 to 10 3 0 281 7 14 244 62 0 1E395727192 Black High Temberature 15 to 100 1 0 to 6 9 0 282 7 16 2 50 63 5 14B9943X012 Unpainted g P 80 to 250 5 5to 17 2 0 375 9 53 2 50 63 5 14B9942X022 Unpainted Table 3 Maximum Inlet Pressures and Temperatures MAXIMUM MAXIMUM INLET PRESSURE BODY MATERIAL END CONNECTION TEMPERATURE psig bar F NPT 250 17 2 406 208 Cast iron CL125 FF 125 8 6 353 178 CL250 RF 250 17 2 406 208 NPT 300 20 7 450 232 SWE 300 20 7 450 232 CL150 RF 185 12 8 450 232 Steel CL300 RF 300 20 7 600 3160 PN 16 25 40 RF NPS 1 1 1 2 2 and 3 DN 25 40 50 and 80 300 20 7 600 3160 PN 16 RF NPS 4 DN 100 185 12 8 450 232 PN 25 40 RF NPS 4 DN 100 300 20 7 600 3160 NPT 300 20 7 450 232 CL150 RF 175 12 1 450 232 CL300 RF 300 20 7 600 3160 Stainless steel PN 16 25 40 RF NPS 1 1 1 2 2 and 3 DN 25 40 50 and 80 300 20 7 600 3160 PN 16 RF NPS 4 DN 100 175 12 1 450 232 PN 25 40 RF NPS 4 DN 100 300 20 7 600 3160 1 450 F 232 C with standard seat ring 600 F 316 C with seal weld opti
13. IAL TELTE PRESSURE PRESSURE PRESSURE GAUGE 0 adr GAUGE N 0 r A SENSING LINE N J SENSING LINE I kT BLOCK NE N VALVE PRIMARY NV STRAINER X TRAP AN TYPE 92B x Ky TYPE 92B TRAP E0708 TYPE 92B TWO STAGE INSTALLATION Figure 5 Type 92B Typical Installations Bulletin 71 2 92B 7 x TYPE 92B MAIN VALVE x TYPE 92B MAIN VALVE 6 erd 3 TYPE 6492HM SAFETY TYPE 92B PILOT OVERRIDE PILOT VG x Y TYPE 928 PILOT TOP VIEW du A E D MUN ME a auus 92B PILOT EE xs TYPE 92B MAIN VALVE H F 1 J OJ gr 9 0 FN TYPE 92B PILOT T
14. Management Regulator Technologies Inc USA Headquarters McKinney Texas 75070 USA Tel 1 800 558 5853 Outside U S 1 972 548 3574 Asia Pacific Singapore 128461 Singapore Tel 65 6770 8337 Europe Bologna 40013 Italy Tel 39 051 419 0611 Chartres 28008 France Tel 33 2 37 33 47 00 Middle East and Africa Dubai United Arab Emirates Tel 971 4811 8100 TESCOM Emerson Process Management Tescom Corporation USA Headquarters Elk River Minnesota 55330 2445 USA Tels 1 763 241 3238 1 800 447 1250 Europe Selmsdorf 23923 Germany Tel 49 38823 31 287 Asia Pacific Shanghai 201206 China Tel 86 21 2892 9499 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 International LLC 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 Regulator Technologies Inc does not assume responsibility for the selection use or maintenance of any product Responsibilit
15. YPE 6492HM SAFETY OVERRIDE PILOT SIDE VIEW Figure 6 Safety Override System Installation Example RELIEF VALVE SET 15 psig 1 0 bar T Example Calculation FULL OPEN 25 psig 1 7 bar Quod 74 x 114 7 3417 100 psig 6 9 bar 338 F 170 C 10 psig 0 69 bar 1 0 00065 0 SIN 35 DEG RELIEF VALVE NPS 2 DN 50 TYPE 92B Qmax 8 330 Ib hr 3778 kg hr where Determine the maximum valve flow capacity at wide open failure Cs AP 75 psia 5 2 bar C Tg 0 CP Q maxlibmr 1 0 00065 T sn 2417 AP C HP where Q Steam flow rate lb hr DEG P Absolute inlet pressure psia P1 gauge 14 7 C Wide open gas sizing coefficient see Table 5 C Flow coefficient see Table 5 Ts Degrees of steam superheat at inlet F AP Pressure drop across regulator psia 114 7 psia 7 9 bar Table 5 Main Valve Coefficients Bulletin 71 2 92B FLOW COEFFICIENTS IEC SIZING COEFFICIENTS BODY SIZE Regulating Coefficients Wide Open Coefficients C Km F X F NPS DN C 6 6 6 c 6 5 J 1 25 330 16 5 9 4 480 24 13 7 35 0 80 0 89 0 78 0 24 1 1 2 40 560 28 16 921 46 26 3 35 0 80 0 89 0 78 0 25 2 50 960 48 274 1481 74 42 3 35 0 80 0 89 0 78 0 28 3 80 2000 100 57 1 3042 152 86 9 35 0 80 0 89 0 78 0 26 4 100 2700 135 77 1 4515 225 129 35 0 80 0 89 0 78 0 20 Table 6 Capacities
16. ate Assembly Aluminum Steel and Stainless steel Diaphragm Gasket Cast iron Composition Steel Stainless steel Graphite Diaphragm Valve Guide and Valve Spring Stainless steel Valve Stem and Orifice 416 Stainless steel Bellows and Bellows Retainer Bronze standard or 321 Stainless steel high temperature Stainless steel pilot construction Spring Steel for standard spring and Stainless steel for high temperature spring Upper Spring Seat Plated steel for standard construction and Stainless steel for high temperature spring Lower Spring Seat Aluminum or Carbon steel Screen 304 Stainless steel Check Valve Assembly Stainless steel internal with copper housing or all Stainless steel 1 The pressure temperature limits in this Bulletin or any applicable standard limitation should not be exceeded Inconel is a mark owned by Special Metals Corporation Table 1 Body Sizes and End Connection Styles Bulletin 71 2 92B BODY SIZES NPS DN END CONNECTION STYLES Cast iron Body 1 25 NPT 1 1 2 and 2 40 and 50 3 and 4 80 and 100 1 Available in steel bodies only NPT CL125 FF and CL250 RF CL125 FF and CL250 RF Steel and Stainless steel Body NPT SWE CL150 RF CL300 RF and PN 16 25 40 RF CL150 RF CL300 RF PN 16 RF and PN 25 40 RF Table 2 Outlet Pressure Ranges OUTLET PRESSURE SPRING WIRE
17. gm case above the pipeline so that condensate will not collect in the cases In order to obtain the performance given in this bulletin connect the downstream end of the control line into a straight run of pipe The connection should be located at least 6 pipe diameters from the valve body outlet in an unswaged pipeline or 10 pipe diameters from the swage in a swaged pipeline The Type 92B pilot should also be installed with the adjusting screw pointing up and the control line should be sloped with a downward pitch to ensure drainage of condensate The body should be installed so the flow is in the same direction as the arrow on the body Note that the Type 92B pilot may be installed on either side of the body Overpressure Protection and Relief Valve Sizing Overpressure protection is required when piping and components downstream of a steam regulating valve have a maximum allowable working pressure MAWP that is lower than the upstream supply pressure to the regulating valve In some cases the regulating valve itself may have a lower outlet pressure rating than its inlet pressure rating which will require overpressure protection Governing codes and standards define the type and design of overpressure protection When full flow relief valves are specified they must relieve a maximum specified flow at a pressure not to exceed that specified by applicable codes In North America the governing code for most steam regulating valve i
18. ing pressure to the downstream system The check valve cartridge assembly has a factory setting to limit differential pressure across the diaphragm to approximately 40 psid 2 8 bar d If diaphragm differential pressure reaches approximately 40 psid 2 8 bar d the check valve opens to relieve diaphragm loading pressure into the downstream TYPE 92B PILOT B TYPE 92B MAIN VALVE TYPE 6492HM SAFETY OVERRIDE PILOT A E0794 EINEN INLET PRESSURE EE OUTLET PRESSURE L ATMOSPHERIC PRESSURE LOADING PRESSURE HET INTERMEDIATE PRESSURE Figure 4 Safety Override System Schematic system thereby preventing a high differential across the diaphragm which might otherwise cause diaphragm damage The check valve closes and normal operation resumes when the differential pressure across the diaphragm is reduced to the proper level Safety Override System Refer to Figure 4 Once placed in operation the upstream Type 92B pilot B senses the intermediate pressure between both valves and the Type 6492HM A pilot senses pressure downstream of the second valve As demand for flow increases intermediate pressure will fall causing the Type 92B pilot to open As the Type 92B pilot opens loading pressure to the main valve increases opening the main valve The Type 6492HM A safety override pilot remains open because its setpoint is above the setpoint of the downstream valve In the unlikely event that the Bulletin 7
19. ng opening the valve plug and allowing steam to flow downstream Downstream pressure registers under the main diaphragm through the control line and tends to balance the diaphragm Steam from the downstream System also registers under the pilot diaphragm through line Pressure forces the diaphragm upward permitting the pilot valve plug to move toward the closed position Flow of steam to the top of the main diaphragm is thereby reduced and the pressure on main diaphragm drops due to the bleed through the orifice The main valve moves toward the closed position allowing only enough steam flow to satisfy downstream requirements PILOT SUPPLY LINE When steam demand increases the downstream pressure decreases below the setting of the pilot spring The pilot opens to increase the pressure on the main diaphragm The main valve opens to increase the flow downstream Conversely if the steam demand decreases the downstream pressure increases and the pilot reacts to decrease the pressure on top of the main diaphragm The main valve throttles toward the closed position and the steam flow decreases Thus through the combination of pilot and main valve operation control of the downstream steam pressure is maintained An internal check valve is included in all Type 92B pilots to limit differential pressure on the main valve diaphragm In the event of a large decrease in downstream pressure the check valve opens to relieve diaphragm load
20. nstallations is ASME Boiler Code Section VIII which may be amended by local codes or variances The issue in sizing stream relief valves is quantifying its maximum flow rate Maximum flow conditions may occur under many conditions so the entire steam system must be analyzed to make sure the maximum relief valve flow is accurate Failure to do so may cause overpressure In applications where it is determined that the steam regulating valve creates maximum flow to the relief valve several issues must be resolved prior to quantifying the flow to the relief valve 1 There must be general agreement on the failure mode of the regulating valve The Emerson Process Management Regulator Technologies Inc Emerson provides wide open regulating coefficients to assist with sizing steam relief valves The coefficients assume that the valve plug is at maximum travel and still in its normal orientation Contact your local Sales Office prior to relief valve sizing in the event that there is disagreement with the mode of failure 2 Maximum steam flow must be calculated at the pressure obtained at the relief valve s full open condition This pressure is typically larger than a relief valve s set pressure This pressure must be used as the outlet pressure of the steam regulating valve when calculating the maximum flow through the regulating valve 3 Maximum steam flow should be calculated from the manufacturer s recommended procedure The Eme
21. nstream pressure registers under main valve and pilot diaphragms improving response time Double Post Stem Guide Top and bottom seat guides with Inconel bushings eliminate lateral plug instability and premature stem wear W1322 3A Figure 2 Typical Type 92B Construct Bulletin 71 2 92B PIPE PLUG OR TUBE FITTING DIRECTLY OVER ORIFICE FOR EASE OF ACCESSIBILITY BLEED ORIFICE EASILY DIAPHRAGMS AND CLEANED WITH WIRE DIAPHRAGM PLATE DIAPHRAGMS CASE a GUIDE BUSHING PILOT SPRING CASE PILOT PRESSURE SETTING SPRING BELLOWS AND BELLOWS RETAINER LOWER SPRING SEAT ORIFICE CHECK VALVE ASSEMBLY PILOT VALVE STEM AND PLUG VALVE PLUG AND SEAT RING VALVE STEM GUIDE PILOT VALVE SPRING BOTTOM FLANGE REDUCING VALVE SPRING ion Bulletin 71 2 92B Specifications This section lists the specifications for the Type 92B Pressure Reducing Valve The following information is stamped on the nameplate of Type 92B Type Number Maximum Outlet Pressure Maximum Inlet Pressure and Maximum Temperature Available Configurations Pilot operated globe style pressure reducing valve with post guiding and flow to close valve plug action Body Sizes and End Connection Styles See Table 1 Body Ratings and Maximum Inlet Pressures See Table 3 Minimum Differential Pressures Required for Full Stroke 20 psig 1 4 bar with Stainless steel spring 10 psig 0 69 bar with Inconel spring Maximum
22. on Table 4 Minimum Differential Pressures for Safety Override System SPRING RANGE MINIMUM PRESSURE AT WHICH TYPE psig bar SPRING COLOR MONITORING PILOT CAN BE SET 10 to 30 0 69 to 2 1 Yellow 10 psig 0 69 bar over normal downstream pressure 6492HM 25 to 75 1 7 to 5 2 Green 10 psig 0 69 bar over normal downstream pressure 70 to 150 4 8 to 10 3 Black 15 psig 1 0 bar over normal downstream pressure 15 to 100 1 0 to 6 9 Unpainted 10 psig 0 69 bar over normal downstream pressure 6492HTM 80 to 250 5 5 to 17 2 Unpainted 25 psig 1 7 bar over normal downstream pressure Bulletin 71 2 92B CONTROL LINE ORIFICE MAIN VALVE DIAPHRAGM VALVE PLUG PILOT CONTROL LINE PILOT DIAPHRAGM IT 2 dn e 8 ELE P 78 MAIN VALVE SPRING E0672 EE INLET PRESSURE EE OUTLET PRESSURE TT ATMOSPHERIC PRESSURE LOADING PRESSURE Figure 3 Type 92B Operational Schematic Principle of Operation Refer to Figure 3 Compression of the pilot spring pushes diaphragm down and holds pilot valve plug open Outlet pressure is changed by varying the amount of pilot spring compression When steam enters the inlet of the valve it also enters the pilot supply line and flows through the open pilot valve to the top of the main diaphragm The force created by this steam pressure on the diaphragm overcomes the force of the main valve spri
23. ot Optional Yes send one replacement pilot to match this order Pilot Replacement Parts Kit Optional Yes send one pilot replacement parts kit to match this order Steam Specification Worksheet Application Tag Number Valve Type LI Direct Operated L Pressure Loaded Body Material Steel Iron Inlet Outlet End Connection Style Pilot Operated Differential Stainless steel L CL125 FF Flange CL150 RF Flange CL250 RF Flange CL300 RF Flange L PN 16 25 40 RF NPT Inlet Outlet Pipe Size in mm Steam Conditions Maximum Normal Minimum Inlet Pressure psig bar Inlet Temperature F C Outlet Pressure psig bar Flow Ib h or kg h Performance Required Accuracy Requirements gt 10 L lt 2096 lt 30 L lt 4096 Bulletin 71 2 92B Industrial Regulators Emerson Process Management Regulator Technologies Inc USA Headquarters McKinney Texas 75070 USA Tel 1 800 558 5853 Outside U S 1 972 548 3574 Asia Pacific Shanghai 201206 China Tel 86 21 2892 9000 Europe Bologna 40013 Italy Tel 39 051 419 0611 Middle East and Africa Dubai United Arab Emirates Tel 971 4811 8100 For further information visit www fisherregulators com Natural Gas Technologies Emerson Process
24. rson recommends using either the Fisher steam sizing equation or IEC sizing procedure Bulletin 71 2 92B BLOCK VALVE 4 1 INITIAL REDUCED PRESSURE o E REDUCED GAUGE BLOCK VALVE B GAUGE 5 SENSING LINE Sm e VE of Lo MUR VALVE ED Y i STRAINER x TYPE 92B S TRAP E0706 TYPE 92B SINGLE STAGE INSTALLATION REDUCED PRESSURE Q un EAE an GAUGE BLOCK VALVE SENSING LINE 69 d gu 20 MA a 1 Pa Y TL 1 de Wa IX VALVE X VALVE EN TIPE 928 INITIAL REDUCED PRESSURE uL PRESSURE GAUGE 2 m annan an GAUGE 9 BLOCK 9 ER SENSING LINE VALVE 7d d e N 3 L7 0 a EE Ne BLOCK Y pU STRAINER x TYPE AN VALVE m TRAP TRAP E0707 TYPE 92B SINGLE STAGE PARALLEL INSTALLATION BLOCK VALVE VALVE INIT
25. y for proper selection use and maintenance of any Emerson Process Management Regulator Technologies Inc product remains solely with the purchaser Emerson Process Management Regulator Technologies Inc 1980 2014 All Rights Reserved es EMERSON
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