Page 1 Page 2 Page 3 Page 4 Page 5 Page 6 Page 7 Page 8 Page 9 Page 10 Page 11 Page 12Australian Pipeline Valve - Installation, Operation and Maintenance Manual 7 SOFT SEATED PLUG TYPE NEEDLE VALVE - S-H1, S-M5A, S-M5F, S-M9S 3.2 REASSEMBLY OF THE VALVE 1. Lubricate the bonnet threads with appropriate lubricant. 2. Insert the bonnet into the seat cavity hand screw the bonnet into the valve body. 3. Then tighten the bonnet to the torque value shown below: 3/8” orifice valves: - 6.9-8.3 kg-m (50-60 ft·lbs) 5/8” orifice valves: - 17.94-19.32 kg-m (130-140 ft·lbs) 4. Tighten bonnet bush with a wrench, take care not to over tighten. Then check the tightness by turning the handle. If it feels too loose, tighten the bush more. It is feels tight, the stem packing should be replaced and the bush again retightened. 5. The bush tightness requires judgement and experience. It if is too loose the bonnet will leak. If it is too tight, the handle will be hard to turn and the stem seal may be damaged. 6. Then tighten the lock nut (part #6) to lock the bush in place. 7. Replace bonnet lock pin. 3.3 SEAT REPLACEMENT It seat replacement is required, depressurise the valve before removal of the bonnet. 1. Refer to Appendix Table A for parts identification. 2. Remove bonnet lock pin (part #10) from the valve body by using pliers or wire cutters. 3. Unscrew bonnet assembly counter clockwise to remove it from the valve body. 4. Remove seat (part #11) from seat cavity. The seat may be removed from the seat cavity with any smooth surfaced bar used as a pry bar inserted into one of the orifice holes in the seat. 5. Clean seat cavity with acetone. 6. Inspect seat cavity for damage, such as scratches that go from one hole to the other or heavy corrosion in the area where the seat (part #11) is housed. If the seat cavity has become damaged the entire valve must be replaced. 7. Install the new seat (part #11) ensuring that the notch in the side of the seat is centred over the indexing groove. 8. Apply a small amount of lubricant to the bonnet threads and screw it into the body. Ensure the plug is fully retracted up into the bonnet. 9. Tighten bonnet to 6.9-8.3 kg-m (50-60 ft·lbs) for 3/8” orifice valves and 17.94-19.32 kg-m (130-140 ft·lbs) for 5/8” orifice valves. 10. Install bonnet lock pin (part #10). 4 . 0 F I N A L I N S P E C T I O N Turn the handle to close and open the valve. Check for sticking, rubbing or any resistance to smooth operation.