1900 Series - Maintenance Manual

More documents

Recommendations

Info

Packed CapRelease NutLever ShaftPackingLifting ForkAdjustingScrewRelease LocknutLiverAdjusting ScrewLocknutCap BoltSpindleFigure 41: Packed LeverXV. Manual Popping ofthe Valve (Contd.)Since the deadweight of a Packed Lever, and Air-Operated Packed Lever has a tendency to lift the valve,the lever should be supported or counterweighted sothat the lifting fork does not contact the release nut (seeFigures 41 and 42)The air-operated lifting device is designed to fully openthe valve with 75% of set pressure under the valvedisc in compliance with ASME Section VIII. For certainapplications, the air operator may be designed to fullyopen the valve with no pressure at the valve inlet. Anair-operated device can be operated from a remotepoint and can be used as a “drop out” valve. (A typicaldesign is shown in Figure 42, and can be purchasedfrom Dresser, Inc.)XVI. Conversion of 1900Series Flanged SRVsAir CylinderMounting PlateCapMounting StudRelease General InformationLocknutStud NutRelease Nut Consolidated ® Type 1900 TM Flanged SRVs can bePinSpindlereadily converted from conventional to bellows style,Leveror vice versa, in the customer’s repair shops. However,ClevisLever Shaftthe Type 1901 and 1902 valves were constructed inLever Shaft CollarCap Bolt the conventional type only. Table 19 shows the partsCollar Retaining RingPacking NutCap Gasket necessary for the typical conversion.PackingLever NutConversion from ConventionalLifting Forkto Bellows TypeFigure 42: Air-Operated Packed LeverATTENTION!!Remove the bonnet plug (41) from the bellowsvalves (see Figure 7) and vent the bonnet (11) to asafe area.Convert from a conventional to a bellows type valveBas follows:E1. Remove the eductor tube (40) from the base (1) byFDC45°2. Machine the existing lower spring washer (17) (seeFigure 43: Lower Spring WasherFigure 43 and Table 20).selecting a drill bit approximately .016” (0.40 mm)smaller in diameter than the outside diameter of theeductor tube. Drill into the bore of the eductor tubewhere the tubing is attached to the base. This willreduce the tube wall thickness to the extent that itcan easily be collapsed for removal. The bellowsfange will cover the hole in the guide surface whichwill remain after the tube is removed.
XVI. Conversion of 1900 Series Flanged SRVs (Contd.)Table 19: Conversion Parts: Conventional and Bellows Style ValvesValve Orifice SizeD, E, F, G, HK, L, M, Q, R, T, UAlso J, N, Pmanufactured after1981. (Note 2)New Parts to Convert FromConventional to Bellows ValveBellows to Conventional Valve1. Bellows assembly - Standard Material, 316L 1. Eductor tube for conventional valve.Stainless Steel.(Not required for UM valves.)2. Set of gaskets for bellows valve. 2. Set of gaskets for conventional valve.3. Guide for bellows valve. 3. Guide for conventional valve.4. Disc holder for bellows valve. 4. Disc holder for conventional valve.5. Spindle for bellows valve (F, G and H only).5. Spindle for conventional valve (F, G andH only).6. Spindle retainer for bellows valve. 6. Spindle retainer for conventional valve.7. Base studs for bellows valve (D, E, F andG only).8. Machine existing lower spring washer (F, Gand H orifices only). Upper spring washer, nochange.9. Drill .719˝ (18.26 mm) dia. on bonnet bossand tap 1/2" N.P.T. (as required) (Note 1)1. Bellows assembly - Standard Material,316L Stainless Steel.7. Base studs for conventional valve (D, E, Fand G only).8. New lower spring washer for conventionalvalve (F, G and H orifices only). Upper springwasher, no change.9. Bonnet vent plugged (if desired).1. Eductor tube for conventional valve.(Not required for UM valves.)2. Set of gaskets for bellows valve. 2. Set of gaskets for conventional valve.3. Drill .719˝ (18.26 mm) dia. on bonnet bossand tap 1/2" N.P.T. (as required) (Note 1)3. Bonnet vent plugged (if desired).4. Studs (1905-30 K and L, 1906-30 K andL only).4. Studs (1905 K and L, 1906 K and L only).1. Bellows assembly - Standard Material,316L Stainless Steel.1. Eductor tube for conventional valve.(Not required for UM valves.)2. Set of gaskets for bellows valve. 2. Set of gaskets for conventional valve.J, N, PManufactured before1982. (Note 2)V, W3. Guide for bellows valve. 3. Bonnet vent plugged (if desired).4. Disc holder for bellows valve.5. Drill .719˝ (18.26 mm) dia. on bonnet bossand tap 1/2 N.P.T. (as required). (Note 1)4. Drill .438˝ (11.11 mm) dia. through guideflange 1.813 (46.04 mm) from guide borecenterline(J orifice only).5. Studs (1905 N and P, 1906 N and P only).6. Studs (1905-30 N and P, 1906-30 N andP only).1. Bellows assembly. 1. Set of gaskets for conventional valve.2. Set of gaskets for bellows valve. 2. Bonnet vent plug (if desired).3. Disc holder for bellows valve.4. Guide for bellows valve.5. Lift restricting ring.6. Studs.Note 1 Valves manufactured after 1980 are furnished with bonnet vent machined.Note 2 J, N, P orifice valves manufactured after 1981 are furnished with threaded disc holder and reduced guide bore for balanced bellowsconversion.1900 Series Safety Valve (July/2010) | 51
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 and 32: XI. MaintenanceGeneral InformationA
Page 33 and 34: XI. Maintenance (Contd.)Table 7d: N
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: XIII. Setting and Testing (Contd.)I
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

1900 Series - Maintenance Manual

Create successful ePaper yourself

Delete template?

Save as template?