Emerson 1805 Series Relief Valves Data Sheet
Contents
1. Type Refer to Table 2 for Construction Features Relief Set Pressure Range Select One Select One 3 4 or 1 NPT Body Size 1805 2 5 to 35 psig 0 34 to 2 4 bar Green 1805 3 10 to 60 psig 0 69 to 4 1 bar Silver 1805 4 20 to 125 psig 1 4 to 8 6 bar Blue 1805 5 1 1 2 or 2 NPT Body Size 1805 7 5 to 20 psig 0 34 to 1 4 bar Red 10 to 50 psig 0 69 to 3 4 bar Blue Body Size and End Connection Style Select One 35 to 128 psig 2 4 to 8 6 bar Yellow a Replacement Parts Kit Optional 1 1 2 NPT Yes send one replacement parts kit to match this order 2 NPT Body Material Select One Cast Iron All sizes Ductile Iron NACE 3 4 or 1 NPT body size only 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 mn Downstream Pressure Setting s P Maximum Flow Q ma Regulators Quick Order Guide Performance Required Accuracy Requirements Need for Extremely Fast Response Readily Available for Shipment Allow Additional Time for Shipment Special Order Constructed from Non Stocked Parts Consult your local Sales Office for Availability Other Requirements Availab2. gas service comply with the chemical physical and metallurgical requirements of NACE MR0175 and or NACE MR0103 Customers have the responsibility to specify correct materials Environmental limitations may apply and shall be determined by the user Bulletin 71 4 1805 lt G gt lt AF2211 1 4 NPT TYPE 1805 2 1805 3 OR 1805 7 WITH CLOSING CAP Figure 5 1805 Series Dimensional Drawings Table 4 1805 Series Dimensions lt 0 gt lt AH6967 ca cS E E ca ca ca ca TYPE 1805 4 OR 1805 5 WITHOUT CLOSING CAP BODY SIZE AND DIMENSION INCHES mm TYPES END CONNECTION MATERIAL STYLE NPT A B c D max Cast iron 3 62 92 1 81 46 1 00 25 6 44 164 1805 2 a le a Ductile iron NACE 3 88 99 1 94 49 1 38 35 6 44 164 1805 7 I Cast iron 3 62 92 1 81 46 1 00 25 6 44 164 Ductile iron NACE 3 88 99 1 94 49 1338 35 6 44 164 1805 3 1 1 2 Cast iron 5 68 149 2 94 75 1 69 43 9 12 232 1805 5 2 Cast iron 5 68 149 2 94 75 1 69 43 9 12 232 1 With closing cap Bulletin 71 4 1805 Ordering Information Please give the following information when ordering any of the 1805 Series relief valves 1 Type Number 2 Body Size and Material 3 Desired Relief Pressure Range Ordering Guide
3. ESSURE INCLUDING BUILDUP 150 psig 10 3 bar AT 150 F 66 C Figure 3 Relief Capacity Curves SPRING 1D665927022 SPRING 1E543627142 SPRING 1D892327022 150 125 100 75 50 25 150 125 100 75 50 25 150 125 100 75 50 25 1 1 2 AND 2 NPT BODIES 125 8 6 100 6 9 75 5 2 10 3 8 6 16 9 60 4 1 15 2 50 3 4 SETPOINT 10 3 8 6 50 3 4 40 2 8 6 9 5 2 3 4 30 2 1 20 1 4 SETPOINT 10 3 8 6 6 9 20 1 4 5 2 10 0 69 3 4 0 0 20 40 60 0 54 1 07 1661 CAPACITY IN THOUSAND SCFH AT 60 F AND 14 7 psia Nm h AT 0 C AND 1 01325 bar OF 0 6 SPECIFIC GRAVITY NATURAL GAS 5 0 34 SETPOINT 80 100 2 14 2 68 120 140 160 180 3 22 3 75 4 29 4 82 11 7 200 5 36 Bulletin 71 4 1805 W1258 Figure 4 Type 1805 3 Closing Cap Sectional View Installation The 1805 Series relief valves may be installed in any position However the outlet connection and vents must be protected against the entrance of rain snow insects or any other foreign material that may plug the outlet or affect the opening and closing of the valve If it is necessary to pipe away the outlet remove the outlet screen if one is present Flow through the valve must be as indicated by the flow direction arrow on the body For di
4. Maximum Inlet Pressure 150 psig 10 3 bar including buildup Relief Valve Set Pressure Ranges See Table 1 Flow and IEC Sizing Coefficients See Table 3 Temperature Capabilities 20 to 150 F 29 to 66 C Construction Materials Body Cast ron all sizes and Ductile Iron NACE 3 4 and 1 NPT body sizes Diaphragm Nitrile NBR Valve Guide Orifice Aluminum O Ring Washer Stainless steel O Rings Nitrile NBR O Ring Holder Aluminum Diaphragm Plate Brass Upper Spring Seat Plated steel Union Nut Ductile Iron Vent Screen Stainless steel Approximate Weights 3 4 to 1 NPT bodies 5 pounds 2 kg 1 1 2 to 2 NPT bodies 13 pounds 6 kg 1 The pressure temperature limits in this Bulletin or any applicable standard limitation should not be exceeded Table 1 Relief Valve Set Pressure Ranges RELIEF PRESSURE RANGE SPRING FREE LENGTH SPRING WIRE DIAMETER SPRING PART SPRING COLOR BODY SIZE NPT NUMBER CODE psig bar Inches mm Inches mm 5 to 35 0 34 to 2 4 1B986027212 Green 2 25 57 2 0 12 3 05 3 4 or 1 10 to 60 0 69 to 4 1 1B788327022 Silver 243 54 1 0 14 3 56 20 to 125 1 4 to 8 6 1B788427022 Blue 1 94 49 3 0 18 4 57 5 to 20 0 34 to 1 4 1D892327022 Red 2 94 74 7 0 17 4 32 1 1 2 or 2 10 to 50 0 69 to 3 4 1D665927022 Blue 2 50 63 5 0 22 5 59 35 to 125 2 4 to 8 6 1E543627142 Yellow 2 31 58 7 0 28 7 11 Table 2 Available Constructions TY
5. October 2011 1805 Series Relief Valves P1026 Type 1805 2 Figure 1 Typical 1805 Relief Valves Introduction The 1805 Series relief valves are designed for use in farm tap applications where a safety relief valve is needed between the first and second stage regulators The 1805 Series is suitable for natural gas air propane or any operating medium that is not corrosive to the internal parts Relief pressures range from 5 to 125 psig 0 34 to 8 6 bar Maximum pressure including buildup is 150 psig 10 3 bar Features Tight Shutoff Provided by the Nitrile NBR O ring and O ring seat Bulletin 71 4 1805 1805G Type 1805 4 Easy Maintenance The union nut allows quick removal of the cage assembly for trim inspection The valve can be back in operation in a matter of minutes Simple Adjustment A single adjusting screw is used to meet individual application requirements Complete Venting A closing cap is available if all venting must be piped away Sour Gas Service Capability Optional materials are available for applications handling sour gases These constructions comply with the recommendations of the NACE International Standards MRO175 and MRO103 FISHER EMERSON Process Management 100160 012 Bulletin 71 4 1805 Specifications Available Constructions See Table 2 Body Style Globe body Body Sizes and End Connection Style 3 4 1 1 1 2 or 2 NPT
6. PE NUMBER CONNECTION NPT DISTINCTIVE CONSTRUCTION FEATURES 1805 2 3 4 or 1 Cast iron spring case closing cap with 1 4 NPT vent placed over the adjusting screw 1805 3 1 1 2 or 2 Cast iron spring case closing cap with 1 4 NPT vent placed over the adjusting screw 1805 4 3 4 or 1 Cast iron spring case 1805 5 1 1 2 or 2 Cast iron spring case 1805 7 3 4 or 1 a a cap with 1 4 NPT vent placed over the adjusting Table 3 Flow and IEC Sizing Coefficients BODY SIZE NPT C 3 4 to 1 35 1 1 2 to 2 IEC SIZING COEFFICIENTS Kn X Fp F 0 73 0 39 0 79 0 89 0 94 0 44 UPPER SPRING SEAT DIAPHRAGM HEAD UNION NUT O N 1 O RING HOLDER VALVE SEAT O RING WASHER A6671 NLET PRESSURE ouTLET EXHAUST PRESSURE ATMOSPHERIC PRESSURE Figure 2 1805 Series Operational Schematic Principle of Operation See Figure 2 Relief valves respond to changes in upstream pressure If upstream pressure increases and exceeds the relief valve setting the valve will open and allow gas to vent to the atmosphere When upstream pressure returns to normal level below the setting of the relief valve the relief valve automatically closes and normal system operation resumes In the 1805 Series relief valves the upstream pressure registers underneath the diaphragm Gas reaches the diaphragm through the space between the O ring holder and the valve guide orifice in 3 4 a
7. ility of the product being ordered is determined by the component with the longest shipping time for the requested construction Bulletin 71 4 1805 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 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 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 128461 Singapore Tel 65 6770 8337 Europe Bologna 40013 Italy Tel 39 051 419 0611 Gallardon 28320 France Tel 33 2 37 33 47 00 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 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 International LLC a business of Emerson Process Ma
8. mensional information see Figure 5 Capacity Information Natural gas relieving capacities at selected inlet pressures setpoint plus buildup are given in Figure 3 Flows are in thousands SCFH 60 F and 14 7 psia of 0 6 specific gravity natural gas To determine the equivalent capacities for other gases multiply the capacity obtained from the curves by the following appropriate conversion factor 0 775 for air 0 789 for nitrogen 0 625 for propane or 0 548 for butane 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 Nm h at 0 C and 1 01325 bar multiply values obtained from Figure 3 by 0 0268 Overpressure Relief pressure ratings are from 5 to 125 psig 0 34 to 8 6 bar The maximum inlet pressure including buildup is 150 psig 10 3 bar System operation within these limitations does not eliminate the possibility of damage from external sources or from debris in the gas line The relief valve should be inspected for damage regularly and after any overpressure condition Universal NACE Compliance Optional materials are available for applications handling sour gases These constructions comply with the recommendations of NACE International sour service standards The manufacturing processes and materials used by Emerson assure that all products specified for sour
9. nagement 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 rac j eme Emerson Process Management Regulator Technologies Inc 2011 All Rights Reserved Pi SS N 1 ana ye men t
10. nd 1 NPT bodies or through registration holes in the valve guide orifice in 1 1 2 and 2 NPT bodies Bulletin 71 4 1805 DIAPHRAGM VALVE GUIDE ORIFICE O RING BODY When the upstream pressure increases beyond the spring setting the force underneath the diaphragm overcomes spring compression The O ring holder moves upward carrying the O ring away from the valve seat This opens the flow line allows gas to flow to the atmosphere and relieves the overpressure condition When upstream pressure registered on the diaphragm decreases to a level below that of the spring setting of the relief valve the spring force pushes the diaphragm plate and O ring holder toward the valve seat Contact between O ring and valve seat prevents further flow to atmosphere Bulletin 71 4 1805 3 4 AND 1 NPT BODIES 10 3 8 6 6 9 ETPOINT 15 2 SPRING 1B788427022 13 4 10 3 8 6 16 9 15 2 N A N 65 a 2 a N 40 2 8 3 4 5 1 7 INLET PRESSURE SETPOINT PLUS BUILDUP psig bar SETPOINT 10 3 8 6 6 9 SPRING 1B986027212 15 2 13 4 5 0 34 SETPOINT 5 10 15 20 25 30 0 043 0 27 0 40 0 54 0 67 0 80 B0812 1 SETPOINT IS TO BE INTERPRETED AS BUBBLE POINT 35 0 94 40 1 07 INLET PRESSURE SETPOINT PLUS BUILDUP psig bar MAXIMUM PR
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