GE Baker Hughes 2900-40 Series Maintenance Manual page 5

XV. Inspection and Part Replacement ................................................................................................................................................................................... 37
1. Guide ................................................................................................................................................................................................................................ 37
2. Base .................................................................................................................................................................................................................................. 37
3. Cover Plate ..................................................................................................................................................................................................................... 37
4. O-Ring Retainer ........................................................................................................................................................................................................... 37
5. Nozzle .............................................................................................................................................................................................................................. 37
6. Spring ............................................................................................................................................................................................................................... 37
7. Standard Metal Seated Disc ................................................................................................................................................................................... 37
8. Thermodisc * Metal Seated Disc ............................................................................................................................................................................ 37
9. O-Ring Seated Disc .................................................................................................................................................................................................... 38
10. Disc Holder ..................................................................................................................................................................................................................... 38
11. Solid Metal Gaskets ................................................................................................................................................................................................... 38
12. Main Valve Piston ........................................................................................................................................................................................................ 38
XVI. Reassembly of 2900-40 Main Valve ......................................................................................................................................................................... 39
A. Lubricants and Sealants .......................................................................................................................................................................................... 39
B. Assembly Procedure with Metal Seats .............................................................................................................................................................. 39
C. Assembly Procedure with O-Ring Seats ........................................................................................................................................................... 39
XVII. Disassembly of Pilot Valve .......................................................................................................................................................................................... 43
A. 39PV07/37 Disassembly ......................................................................................................................................................................................... 43
B. Cleaning ......................................................................................................................................................................................................................... 43
XVIII. Part Inspection of Pilot Valve .................................................................................................................................................................................... 46
A. 39PV07/37 ..................................................................................................................................................................................................................... 46
XIX. Reassembly of Pilot Valve ............................................................................................................................................................................................ 47
A. Lubricants and Sealants .......................................................................................................................................................................................... 47
B. Assembly of 39PV07/37 ........................................................................................................................................................................................... 47
XX. Setting and Testing .......................................................................................................................................................................................................... 50
A. General Information .................................................................................................................................................................................................. 50
B. With Standard Options ............................................................................................................................................................................................ 50
C. With Sensing Ring Option ....................................................................................................................................................................................... 51
D. Functional Testing ...................................................................................................................................................................................................... 51
E. Field Testing of POSRV Assembly ........................................................................................................................................................................ 53
E.1 Field Test Connection ...................................................................................................................................................................................... 53
E.2 Pilot Valve Tester ............................................................................................................................................................................................... 53
F. Hydrostatic Testing and Gagging ........................................................................................................................................................................ 53
XXI. Troubleshooting .................................................................................................................................................................................................................... 54
XXII. 2900-40 Series POSRV Options ................................................................................................................................................................................. 55
A. Backflow Preventer .................................................................................................................................................................................................... 55
A.1 Disassembly Instructions ............................................................................................................................................................................... 55
A.2 Cleaning ................................................................................................................................................................................................................. 55
A.3 Parts Inspection ................................................................................................................................................................................................. 55
A.4 Reassembly Instructions ................................................................................................................................................................................ 55
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