Pressure Tech LF-690 Operating And Service Manual Download | Manualshive

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THE LF-690/691 SERIES

Operating and Service Manual

Series includes all variants of LF-690/691

Issue D
March 2020

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Summary of Contents for LF-690

Page 1: ...1 THE LF 690 691 SERIES Operating and Service Manual Series includes all variants of LF 690 691 Issue D March 2020...

Page 2: ...F 690 with Domed SA Unbalanced MVA 8 6 2 Servicing the LF 690 Balanced Regulator 9 6 2 1 Accessing the Balanced Main Valve Assembly MVA 9 6 2 2 Figure 2 Sectional View of the LF 690 Balanced MVA 10 6...

Page 3: ...systems be pressure tested leak tested and purged with an inert gas such as nitrogen Prior to placing into service ensure that the regulator is in the fully closed position with the adjusting mechanis...

Page 4: ...ny time The LF 690 series may be offered with pressure limiting pressure locking or pre set pressure options Pressure limited regulators are fitted with locknuts on the adjusting mechanism in order to...

Page 5: ...office Servicing and maintenance work on the LF 690 regulators should only be performed after fully reading and understanding the Operating and Servicing Manual Due to the compressibility of gases the...

Page 6: ...eplace the connector pin chamfer down into the body while the body is up side down The pin should locate within the baffle plate 3 vi The new ceramic seat 2 should be placed in the seat cartridge 5 wi...

Page 7: ...ing the sensor firmly in a vice with the vent seat nut 13 facing upwards ix The vent seat nut 13 can be removed using a 10mm open ended spanner and the vent seat 14 can then be removed from the sensor...

Page 8: ...13 PT C 091 VENT SEAT NUT 14 PT C 029 013 PEEK VENT SEAT 15 PT C 042 LOAD SPRING 16 PT C 045 ADJUSTING NUT 17 PT C 046 SCREW 18 PT C 043 004 ADJUSTING SCREW 19 BEAR 51103 SS SS BEARING 20 FIT M3x6MM S...

Page 9: ...does not fall out of place viii Replace all of the O rings and Backups 31 34 38 39 40 within and around Bottom Nut 3 Note The small back up ring 38 should be placed into the bottom nut 3 first followe...

Page 10: ...10 6 2 2 Figure 2 Sectional View of the LF 690 Balanced MVA...

Page 11: ...vent seat 23 for damage and replace xi Replace all O rings and backups 29 30 33 35 37 located on the sensor 15 and sensor holder 14 prior to reassembly ensuring adequate lubrication is used xii Inser...

Page 12: ...087 12mm SENSOR 16 PT C 091 VENT SEAT NUT 17 PT C 042 MAIN LOAD SPRING 500KG 18 PT C 040 BONNET 19 PT C 043 004 ADJUSTING SCREW 20 PT C 045 ADJUSTING NUT 21 PT C 046 ADJUSTING NUT SCREW 22 BEAR 51103...

Page 13: ...the connector pin chamfer down into the body while the body is up side down The pin should locate within the baffle plate 3 vi The new ceramic seat 2 should be placed in the seat cartridge 5 with the...

Page 14: ...s vii The vent seat nut 13 can be removed using a 10mm open ended spanner and the vent seat 14 can then be removed from the sensor 10 along with the 6 85mm x 2mm O ring 22 viii Inspect the vent seat 1...

Page 15: ...HOLDER 12 PT C 095 001 DOMED SPRING REST 13 PT C 091 003 VENT SEAT NUT 14 PT C 029 013 001 PEEK VENT SEAT 15 SPR G40X89 LOAD SPRING 16 PT C 045 ADJUSTING NUT 17 PT C 046 SCREW 18 PT C 043 001 ADJUSTI...

Page 16: ...perating Temperature 20 C to 80 C Materials Body and Trim 316 SS Seat Ceramic Flow Capacity Cv Standard 0 1 High Pressure 0 05 Balanced 0 3 Leakage Liquid Zero drops of water at max inlet Gas Bubble t...

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