1900 Series - Maintenance Manual

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XI. Maintenance (Contd.)Lapped Nozzle Seat WidthsA wide nozzle seat will induce simmer, especially in thesmaller-orifice, lower-pressure valves. For this reason,the seats of valves other than O-ring valves should beas narrow as is practical. Since the seat must be wideenough to carry the bearing load imposed upon it by thespring force, the higher-pressure valves must have widerseats than the lower-pressure valves. The nozzle seatwidth should conform to the measurements in Tables 7ato 7d.Table 7a: Nozzle Seat Width (Standard MetalSeat Design)Lapped SeatSet Pressure RangeOrificeWidthpsig barg in. mmD-G 1 – 50 0.07 – 3.45 .012 0.3051 – 100 3.52 – 6.89 .018 0.46101 – 250 6.96 – 17.24 .025 0.64251 – 400 17.31 – 27.58 .032 0.81401 – Above 27.65 – Above .038 0.97H-J 1 – 50 0.07 – 3.45 .019 0.4851 – 100 3.52 – 6.89 .025 0.64101 – 250 6.96 – 17.24 .029 0.74251 – 400 17.31 – 27.58 .032 0.81401 – 800 27.65 – 55.16 .038 0.97801 – Above 55.23 – Above .038 1 0.97 1K-N 1 – 50 0.07 – 3.45 .025 0.6451 – 100 3.52 – 6.89 .030 0.76101 – 250 6.96 – 17.24 .035 0.89251 – 400 17.31 – 27.58 .040 1.02401 – 800 27.65 – 55.16 .045 1.14801 – Above 55.23 – Above .045 1 1.14 1P-R 1 – 50 0.07 – 3.45 .030 0.7651 – 100 3.52 – 6.89 .037 0.94101 – 251 6.96 – 17.31 .045 1.14251 – 400 17.31 – 27.58 .052 1.32401 – 800 27.65 – 55.16 .059 1.50801 – Above 55.23 – Above .064 1.63T 1 – 50 0.07 – 3.45 .040 1.0251 – 100 3.52 – 6.89 .045 1.14101 – 250 6.96 – 17.24 .053 1.35251 – 300 17.31 – 20.68 .060 1.52U 1 – 50 0.07 – 3.45 .040 1.0251 – 100 3.52 – 6.89 .045 1.14101 – 250 6.96 – 17.24 .053 1.35251 – 300 17.31 – 20.68 .060 1.52V 1 – 50 0.07 – 3.45 .075 1.9151 – 100 3.52 – 6.89 .090 2.29101 – 250 6.96 – 17.24 .115 2.92251 – 300 17.31 – 20.68 .130 3.30W 1 – 50 0.07 – 3.45 .100 2.5451 – 100 3.52 – 6.89 .120 3.05101 – 250 6.96 – 17.24 .140 3.56251 – 300 17.31 – 20.68 .160 4.0632 | Dresser Consolidated ®Table 7b: Nozzle Seat Width (Standard Metal SeatDesign (UM) 2Lapped SeatSet Pressure RangeOrificeWidthpsig barg in. mmT-U 1 – 50 0.07 – 3.45 .040 1.0251 – 100 3.52 – 6.89 .045 1.14101 – 250 6.96 – 17.24 .053 1.35251 – 300 17.31 – 20.68 .060 1.52Note 2: All other values same as in Table 7a.Table 7c: Nozzle Seat Width (Thermodisc SeatDesign)Set Pressure Range Lapped Seat WidthOrificepsig barg in. mmD-F 1 – 100 0.07 – 6.89 .020 – .030 0.51 – 0.76101 – 300 6.96 – 20.68 .035 – .045 0.89 – 1.14301 – 800 20.75 – 55.16 .045 – .055 1.14 – 1.40801 – Above 55.23 – Above Full Width 3 Full Width 3G-J 1 – 100 0.07 – 6.89 .025 – .035 0.64 – 0.89101 – 300 6.96 – 20.68 .035 – .045 0.89 – 1.14301 – 800 20.75 – 55.16 .045 – .055 1.14 – 1.40801 – Above 55.23 – Above Full Width 3 Full Width 3K-N 1 – 100 0.07 – 6.89 .035 – .045 0.89 – 1.14101 – 300 6.96 – 20.68 .045 – .055 1.14 – 1.40301 – 800 20.75 – 55.16 .055 – .065 1.40 – 1.65801 – Above 55.23 – Above Full Width 3 Full Width 3P-R 1 – 100 0.07 – 6.89 .040 – .050 1.02 – 1.27101 – 130 6.96 – 8.96 .050 – .065 1.27 – 1.65131 – 800 9.03 – 55.16 .060 – .070 1.52 – 1.78801 – Above 55.23 – Above Full Width 3 Full Width 3T 1 – 100 0.07 – 6.89 .050 – .065 1.27 – 1.65101 – 300 6.96 – 20.68 .060 – .075 1.52 – 1.91U 1 – 100 0.07 – 6.89 .050 – .065 1.27 – 1.65101 – 300 6.96 – 20.68 .060 – .075 1.52 – 1.91101 – 300 6.96 – 20.68 .095 – .130 2.41 – 3.30W 1 – 100 0.07 – 6.89 .100 – .125 2.54 – 3.18101 – 300 6.96 – 20.68 .120 – .160 3.05 – 4.06Note 1: + .005" (0.13 mm) per 100 psig (6.89 barg)[.070"(1.78 mm) ± .005"(0.13) max]. Note 3: Not to exceed .070"(1.78 mm) ± .005"(0.13).
XI. Maintenance (Contd.)Table 7d: Nozzle Seat Width (Standard Soft SeatDesign (UM))OrificeLapped SeatSet Pressure RangeWidthpsig barg in. mmF-H 1 – 124 0.07 – 8.55 .010 0.25125 – 359 8.62 – 24.75 No Lapping, Sharp Angle360 – 749 24.82 – 51.64 .005 0.13750 – Above 51.71 – Above .010 0.25J-L 1 – 124 0.07 – 8.55 .015 0.38125 – 359 8.62 – 24.75 No Lapping, Sharp Angle360 – 749 24.82 – 51.64 .010 0.25750 – Above 51.71 – Above .015 0.38M-P 1 – 124 0.07 – 8.55 .025 0.64125 – 359 8.62 – 24.75 .005 0.13360 – 749 24.82 – 51.64 .018 0.46750 – Above 51.71 – Above .050 1.27Q-R 1 – 124 0.07 – 8.55 .072 1.83125 – 200 8.62 – 13.79 .013 0.33201 – 360 13.86 – 24.82 .025 0.64T-U 1 – 124 0.07 – 8.55 .072 1.83125 – 200 8.62 – 13.79 .013 0.33201 – 360 13.86 – 24.82 .025 0.64V-W 1 – 124 0.07 – 8.55 .100 2.54125 – 200 8.62 – 13.79 .017 0.43201 – 300 13.86 – 20.68 .025 0.64To measure the seat width, use a Model S1-34-35-37Bausch and Lomb Optical Co. measuring magnifier or anequivalent seven-power glass with a .750" (19.05 mm)scale showing graduations of .005 inch (0.13 mm).Figures 28a and 28b illustrate the use of this tool inmeasuring the nozzle seat width.Lapping Disc SeatsUse a ring lap or lapping plate to lap the disc in acircular motion, applying uniform pressure and slowlyrotating the disc or lap.Precautions and Hints forLapping SeatsTo ensure a quality lapping process, observeprecautions and guidelines as follows:• Keep work materials clean.0NozzleWidthMeasuringMagnifierNozzleFigure 28a: Measuring Magnifier0.10.20.3 0 30.40.5 0. 6 0.7Flat Seat5° TaperFigure 28b: Measuring Magnifier DetailIf additional lighting is required for measuring, usea gooseneck fl ashlight similar to the Type A LampAssembly (Standard Molding Corp.), or equivalent.• Always use a fresh lap. If signs of wear (out offlatness) are evident, recondition the lap.• Apply a very thin layer of lapping compound to thelap to prevent rounding off the edges of the seat.• Keep the lap squarely on the flat surface, and avoidrocking the lap, which causes rounding of the seat.• When lapping, keep a firm grip on the lapped part toprevent dropping it and damaging the seat.• Lap in a circular motion while applying a uniformpressure. Slowly rotate the lap to evenly distributethe lapping compound.1900 Series Safety Valve (July/2010) | 33
Page 4 and 5: Table of ContentsSection Subject Pa
Page 6 and 7: I. Product Safety Sign and Label Sy
Page 8 and 9: III. IntroductionThe safety relief
Page 10 and 11: V. (Contd.)V.1.1 Standard Cap Types
Page 12 and 13: V. (Contd.)V.3 V-W Bellows Metal Se
Page 14 and 15: VI. Handling, Storage, and Pre-Inst
Page 16 and 17: VII. Recommended Installation Pract
Page 18: VIII. Disassembly Instructions (Con
Page 21 and 22: X. Parts InspectionNozzle Inspectio
Page 23 and 24: X. Parts Inspection (Contd.)Orifice
Page 25 and 26: X. Parts Inspection (Contd.)AFigure
Page 27 and 28: X. Parts Inspection (Contd.)Orifice
Page 29 and 30: X. Parts Inspection (Contd.)Guide I
Page 31: XI. MaintenanceGeneral InformationA
Page 35 and 36: XI. Maintenance (Contd.)Re-Machinin
Page 37 and 38: XI. Maintenance (Contd.)OrificeSize
Page 39 and 40: XII. ReassemblyGeneral InformationT
Page 41 and 42: XII. Reassembly (Contd.) Use a scre
Page 43 and 44: XII. Reassembly (Contd.)OrificeTabl
Page 45 and 46: XIII. Setting and TestingGeneral In
Page 47 and 48: XIII. Setting and Testing (Contd.)S
Page 49 and 50: XIII. Setting and Testing (Contd.)I
Page 51 and 52: XVI. Conversion of 1900 Series Flan
Page 53 and 54: XVII. Troubleshooting 1900 Series S
Page 55 and 56: XIX. Replacement Parts PlanningBasi
Page 57 and 58: XXI. Recommended Spare Parts for 19
Page 59 and 60: XXI. Manufacturer’s Warranty, Fie
Page 61 and 62: XXV. Optional Glide-Aloy PartsOptio
Page 63 and 64: XXVI. Sales Office LocationsMALAYSI

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