Emerson 1808 Series Relief Valve or Backpressure Regulators Data Sheet
Contents
1. Capacity Information Gases Tables 4 and 5 give relief capacities at selected set pressures for the Type 1808 backpressure regulator or relief valve Flows are in thousands of SCFH 60 F and 14 7 psia and thousands of Nm h 0 C and 1 01325 bar of 0 6 specific gravity natural gas To determine 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 0 625 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 If capacity is desired for the Type 1808A multiply by 1 27 Bulletin 71 4 1808 gt 2 19 57 Y fe 2 94 9 88 3 19 J 75 251 DIAMETER 61 10 88 6 13 I lt 276 156 INCHES mm 1808 TYPE 1808 TYPE 1808A COMMON DIMENSIONS FOR BOTH TYPES Figure 3 Dimensions 1 To determine capacities at set pressures or P buildup s absolute inlet pressure buildups not given in Tables 4 and 5 use one P P m buildup of the following formulas and convert according P 14 7 buildup to the factors in the preceding paragraph C C C See Table 3 gov if necessary AP pressure drop across the valve in psig 520 oe Q P buildup C GT Liquids To determine relief capacities in U S gallons per 2 For pressure drop2. pilot then exhausts the loading pressure from the top of the main valve diaphragm The pilot continuously exhausts gas when the inlet pressure is above the set pressure The inlet pressure unbalance overcomes the main spring force and opens the main valve As the inlet pressure drops the pilot control spring begins to close the pilot valve plug and the exhaust slows This causes the inlet pressure to build in the main valve diaphragm casing allowing the control spring to close the main valve Once the main valve is closed the pilot valve plug closes and the exhaust stops Bulletin 71 4 1808 Table 5 Capacities for the Type 1808 Using Optional External Control Line and Type 6358B Pilot with High Gain Restriction BUILDUP OVER BUILDUP OVER PRESSURE DROP CAPACITIES OF 0 6 SET PRESSURE SET PRESSURE SET PRESSURE TO SET PRESSURE BELOW SET SPECIFIC GRAVITY RANGE PSIG bar PSIG bar BEGIN OPENING TO FULLY OPEN PRESSURE TO NATURAL GAS e MAIN VALVE MAIN VALVE RESEAT PILOT SCFH Nm h PSIG bar PSIG bar PSIG bar 3 0 21 0 9 0 06 6 0 0 41 37 000 992 3to 18 5 0 35 0 7 0 05 4 0 0 28 37 000 992 0 21 to 1 2 10 0 69 0 7 0 05 1 2 0 08 42 000 1126 15 1 0 0 7 0 05 1 0 0 07 52 000 1394 15 1 0 53 000 1420 15 to 40 20 1 4 63 000 1688 1 0 to 2 8 30 2 1 0 8 0 05 1T 0 07 82 000 2198 40 2 8 101 000 2707 40 2 8 1 0 0 07 102 000 2734 50
3. 2 5 120 3 2 137 8 7 145 3 9 154 4 1 163 4 4 172 4 6 60 4 1 ale 135 3 6 152 4 1 163 4 4 172 4 6 181 4 8 190 5 1 70 4 8 its 150 4 0 168 4 5 181 4 8 190 5 1 200 5 4 209 5 6 80 5 5 Sa 161 4 3 180 4 8 200 5 4 201 5 4 218 5 8 227 6 1 90 6 2 170 4 6 192 5 1 213 5 7 227 6 1 236 6 3 245 6 6 100 6 9 cece 183 4 9 209 5 6 231 6 2 245 6 6 254 6 8 263 7 0 110 7 6 cece 197 5 3 223 6 0 246 6 6 263 7 0 PP Ts Zon Gol 125 8 6 Sees 201 5 4 241 6 5 267 7 2 284 7 6 298 8 0 SSeS Shaded areas indicate capacities with main valve wide open 1 Capacities based on 0 psig 0 bar outlet pressure If outlet pressure is not 0 psig 0 bar shaded capacities may be recalculated using the wide open C and the desired pressure drop 2 For Type 1808A capacities multiply the capacities in this table by 1 27 Relief Valve As long as the inlet pressure is below the set pressure the pilot control spring keeps the pilot valve plug closed Inlet pressure passes through the pilot restriction and registers as loading pressure on top of the diaphragm Force from the main spring in addition to inlet pressure bleeding through the pilot restriction provide downward loading pressure to keep the main valve closed When the inlet pressure rises above the set pressure the pressure on the pilot diaphragm overcomes the pilot control spring and opens the pilot valve plug The
4. 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 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 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
5. 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 Manager Emerson Process Management Regulator Technologies Inc 1978 2010 All Rights Reserved Pre oc
6. 3 5 121 000 3243 60 4 1 1 4 0 09 1 9 0 13 139 000 3725 70 4 8 157 000 4208 35 to 125 2 4 to 8 6 80 5 5 176 000 4717 90 6 2 194 000 5199 100 6 9 1 6 0 11 2 2 0 15 213 000 5708 110 7 6 231 000 6191 125 8 6 258 000 6914 1 Set pressure is defined as the pressure at which the pilot exhaust starts to bubble discharge 2 Crack pressure is the inlet pressure at which the main valve starts audible flow 3 Inlet pressure buildup over the set pressure to achieve wide open capacity 4 Capacities with inlet piping equal to body size and without outlet piping Backpressure Regulator As long as inlet pressure remains below setpoint the pilot spring keeps the pilot valve plug closed Inlet pressure passes through the upper port around the upper portion of the valve plug then through the hollow passage in that valve plug Force from the main spring along with inlet pressure bleeding through the pilot provide downward loading pressure to keep the main valve closed When inlet pressure rises above the set pressure pressure on the pilot diaphragm overcomes the control spring to close the upper port and stroke the valve plug to open the lower port The pilot then exhausts loading pressure from the top of the main valve diaphragm The pilot exhausts only while repositioning the main valve The inlet pressure unbalance overcomes the spring force and opens the main valve As the inlet pressure drops the pilo
7. Bulletin 71 4 1808 July 2010 Types 1808 and 1808A Pilot Operated Relief Valves or Backpressure Regulators W3716 TYPE 1808 W3507 TYPE 1808A Figure 1 Types 1808 and 1808A Pilot Operated Relief Valves or Backpressure Regulators Introduction The Type 1808 globe style and the Type 1808A angle style pilot operated relief valves or backpressure regulators are economical compact devices used in gas or liquid service to maintain pressure on oil and gas separators and in pressure relief applications in gas distribution systems The Types 1808 and 1808A are available with either a Type 6358 or 6358B pilot The Type 6358 pilot is used in gas or liquid backpressure applications throughout the oil and gas production industry This pilot offers a low bleed construction so it only bleeds when it is repositioning the main valve Pressure relief applications in the oil and gas industry are typically handled by the Type 6358B pilot This pilot has a bleed restriction to reduce the buildup pressure required to reach wide open flow These units control pressures from 3 to 125 psig 0 21 to 8 6 bar and the set pressure is varied to individual requirements by the adjusting screw on the pilot On gas service the pilot exhaust can be piped into the downstream piping or vented to atmosphere On liquid service the pilot exhaust should be piped into the downstream piping or to a safe location www fisherregulators com Features e Sim
8. P590 Series Pilot Supply Filter Approximate Weights Type 1808 22 pounds 10 kg Type 1808A 25 pounds 11 kg 1 The pressure or temperature limits in this Bulletin and any applicable standard or code limi e Quick Disassembly With the removal of just two nuts the upper and lower casings lift away exposing the trim and leaving the main valve body in the line Optional Upstream Registration for Reduced Buildup For gas service with the Type 6358B pilot upstream control line construction is available to provide wide open relief flow capacity with less buildup regardless of set pressure Self Draining Body The Type 1808A angle body design has increased capacity and provides lations should not be exceeded complete process fluid drainage from body cavity during shut down period or before disassembly of the main valve Specifications The Specifications section gives some general specifications for the 1808 Series Pilot Operated Relief Valves or Backpressure Regulators The nameplates give detailed information for a particular regulator as it comes from the factory UPPER PORTION OF VALVE PLUG DIAPHRAGM TO EXHAUST ASSEMBLY PORT HOLLOW PASSAGE IN VALVE PLUG STEM LOWER PORTION OF VALVE PLUG TO MAIN VALVE DIAPHRAGM RESTRICTION PLUG TYPE 6358 BACKPRESSURE SERVICE VALVE PLUG Gl INLET PRESSURE Ej ATMOSPHERIC PRESSURE GGG OUTLET EXHAUST PRESSURE LOADING PRESSURE E0075 Fig
9. nd 6358B Set Pressure Ranges Pressure Ratings and Pilot Spring Information SET PRESSURE RANGES PILOT SPRING INFORMATION PSIG bar Part Number Color Wire Diameter Inches mm Free Length Inches mm 3to18 0 21 to 1 2 1B986027212 Green 0 120 3 05 2 12 54 0 15 to 40 1 0 to 2 8 1E392527022 Yellow 0 148 3 76 2 00 51 0 35 to 125 2 4 to 8 6 1K748527202 Red 0 192 4 88 2 19 55 6 Table 3 Flow and Sizing Coefficients ag ents las IEC SIZING COEFFICIENTS TYPE WIDEOREN C K C C X F F5 1808 1410 40 1 35 2 0 79 0 89 0 78 0 50 1808A 1800 51 4 35 0 0 76 0 87 Table 4 Capacities for the Type 1808 Using Standard Internal Control Line and a Type 6358 or 6358B Pilot with High Gain Restriction RELIEF CAPACITY IN THOUSANDS OF SCFH Nm h OF 0 6 SPECIFIC GRAVITY NATURAL GAS PRESSURE i 7 SETTING Pressure Buildup In Psig bar Over Relief Pressure Setting PSIG bar 2 0 14 6 0 41 10 0 69 15 1 0 20 1 4 25 1 7 30 2 1 5 0 34 32 0 9 46 1 2 50 1 3 61 1 6 70 1 9 80 2 1 89 2 4 12 0 83 41 1 1 55 1 5 65 1 7 74 2 0 84 2 3 93 2 5 102 2 7 20 1 4 56 1 5 73 2 0 80 2 1 89 2 4 99 2 7 108 2 9 117 3 1 30 2 1 67 1 8 89 2 4 99 2 7 108 2 9 aq 3 1 127 3 4 136 3 6 40 2 8 85 2 3 105 2 8 120 3 2 127 3 4 136 3 6 145 3 9 154 4 1 50 3 5 94
10. pacities See Tables 4 and 5 and Capacity Information section Pressure Registration Internal standard or External optional Pilot Tubing and Connections 1 4 NPT with or without P590 Series filter Temperature Capabilities 20 to 180 F 29 to 82 C Construction Materials Main Valve Type 1808 Body Cast iron or WCC Steel Type 1808A Body Cast iron Diaphram Plates and Diaphragm Casings Zinc plated steel Diaphragm Neoprene CR Nitrile NBR Construction Materials continued O Rings Nitrile NBR Gaskets Nitrile NBR Back up Rings Polytetrafluoroethylene PTFE Spring Zinc plated steel standard Valve Plug Guide Stainless steel 6358 Series Pilots Body Aluminum or CF8M Stainless steel Spring Case Aluminum or Stainless steel Body Plug Aluminum or Stainless steel Valve Plug Nitrile NBR or thermoplastic plug with stainless steel stem Spring Zinc plated steel Diaphragm Nitrile NBR or Fluorocarbon FKM Spring Seat Zinc plated steel Stem Guide Stainless steel Adjusting Screw Zinc plated steel O Rings Nitrile NBR or Fluorocarbon FKM Closing Cap Plastic or Stainless steel Connector Cap Stainless steel Mounting Parts Tubing Stainless steel Fittings Steel or Stainless steel Pipe Tees Galvanized steel Pipe Nipples Malleable Iron Galvanized Steel and Stainless Steel Options Upstream control line construction e Pressure gauge 0 to 160 psig O to 11 0 bar 0 to 1 1 MPa e
11. ple Reliable Design Units have fewer parts for reliable service and minimum spare parts inventory Compact and Lightweight Less than 12 inches 305 mm tall and weighs 25 pounds 11 kg or less these units are easily transported and installed where space is limited Simplified Convenient Installation in Any Position Pressure connection in diaphragm casings and factory piped pilot tubing mean no upstream control line is required on standard installations There are no mounting restrictions to limit service Versatility in Both Liquid and Gas Service Pilot exhaust port and standard tapped pilot spring case Figure 2 both come with removable vent for remote piping when necessary The standard tapped pilot spring case comes complete with a gasketed closing cap that permits pressure loading for remote pneumatic adjustment of the set pressure 4 EMERSON Process Management D100163X012 Bulletin 71 4 1808 Specifications Available Configurations See Table 1 Body Size and End Connection Style 2 NPT Maximum Relief Inlet Pressure 150 psig 10 3 bar including buildup Set Pressure Range See Table 2 Differential Pressures Maximum 125 psig 8 6 bar Minimum 5 psig 0 34 bar Type 6358 Pilot Bleed Bleeds only when repositioning the main valve Type 6358B Pilot Bleed Continuously bleeds while inlet pressure is above set pressure Flow and Sizing Coefficients See Table 3 Main Valve Flow Ca
12. r Green 15 to 40 psig 1 0 to 2 8 bar Yellow 35 to 125 psig 2 4 to 8 6 bar Red O Ring Material Select One Nitrile NBR Fluorocarbon FKM Tubing and Fittings Select One Stainless steel tubing and steel fittings Stainless steel tubing and stainless steel fittings kkk Upstream Control Line Construction Optional Yes 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 P Minimum Inlet Pressure P min Downstream Pressure Setting s P Maximum Flow Q amex ian Regulators Quick Order Guide Performance Required Accuracy Requirements Need for Extremely Fast Response Readily Available for Shipment Allow Additional Time for Shipment Consult your local Sales Office for Availability x Special Order Constructed from Non Stocked Parts Other Requirements Availability of the product being ordered is determined by the component with the longest shipping time for the requested construction Bulletin 71 4 1808 Industrial Regulators Emerson Process Management Regulator Technologies Inc USA Headquarters McKinney Texas 75069 1872 USA
13. s lower than critical absolute minute use the Catalog 10 liquid sizing procedures outlet pressure greater than one half of absolute in conjunction with the appropriate liquid sizing inlet pressure use the following formula coefficient C and recovery coefficient K from the Specifications section Then if capacity is desired in 520 3417 AP Nm h multiply U S gallons per minute by 0 2271 Q GET CaP buildup SIN C A P buildup k where Ordering Information Q flow capacity in SCFH G specific gravity of gas Refer to the Specifications section on page 2 Fill out the order guide on page 7 carefully review the i ena ere See Revie description of each specification Always specify the c sizing coefficient from Table 3 type numbers of other desired equipment as well as g the main valve and pilot Bulletin 71 4 1808 Ordering Guide Type Select One Gauge Optional 1808 globe body Yes O 1808A angle body Pilot Supply Filter Optional Body Material Select One O Yes Cast iron Main Valve Parts Kit Optional WCC Steel Type 1808 only Yes please send one parts kit to match this order Pilot Select One Pilot Parts Kit Optional Type 6358 for backpressure application o Yes please send one parts kit to match this order Type 6358B for relief application Set Pressure Range Select One 3 to 18 psig 0 21 to 1 2 ba
14. t control spring begins to close the pilot valve plug and the exhaust slows This causes the inlet pressure to build in the main valve diaphragm casing allowing the control spring to close the main valve Once the main valve is closed the pilot valve plug closes and the exhaust stops Installation Types 1808 and 1808A relief valves or backpressure regulators may be installed in any position as long as the flow through the main valve corresponds with the flow arrow on the main valve body Type 1808 or runs in through the bottom connection and out through the side connection Type 1808A An upstream control line is not required because of the integral pilot supply tubing however for a more accurate relief valve or backpressure regulator this tubing may be disconnected for upstream registration and the main valve diaphragm casing tapping plugged For liquid service the pilot exhaust should be piped to the downstream line or to a safe location For gas service the pilot must be piped to a safe area because in enclosed conditions such as inside installations exhausting gas can accumulate causing a danger of explosion A vent line or stack must be located to avoid venting gas near buildings air intakes or other hazardous locations and the line or stack opening must be protected against anything that might clog it The thrust effect of a venting relief valve must be considered when designing relief valve outlet piping and anchoring
15. ure 2 Type 1808 with 6358 Series Operational Schematic Principle of Operation Refer to Figure 2 A pressure relief valve is a control device that opens to relieve fluid to atmosphere during an overpressure occurrence A backpressure regulator is a control device that maintains a constant upstream pressure throughout a given flow range It functions the same as a relief valve in that it opens on increasing upstream pressure The Type 1808 or 1808A cannot be used as an ASME safety relief valve Bulletin 71 4 1808 UPPER PORTION OF VALVE PLUG TO EXHAUST PORT DIAPHRAGM ASSEMBLY HOLLOW PASSAGE IN VALVE PLUG STEM LOWER PORTION OF VALVE PLUG TO MAIN VALVE DIAPHRAGM FIXED RESTRICTION TYPE 6358B RELIEF SERVICE PILOT EXHAUST CONTROL SPRING SPRING DIAPHRAGM MAIN VALVE Pilots A 6358 Series pilot is typically used with one of several different main valves in a pressure relief or backpressure application This pilot is usually used in gas service It has an easily installed valve plug that can be removed without removing the valve plug stem guide Bulletin 71 4 1 808 Table 1 Available Configurations TYPE PILOT DESCRIPTION a08 6358 Globe style body for backpressure applications 6358B Globe style body for relief applications 1808A 6358 Angle style body for backpressure applications 6358B Angle style body for relief applications Table 2 Types 6358 a
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