33、n pneumatic pipework to the cylinder/actuator and limit switch, and water pipework to the top plate/dome (high temperature models only). 4.Remove set screws securing isolating valve to adaptor if fitted to Dome Valve top plate. 5.Remove set screws from Dome Valve bottom flange to vessel. 6.Lower ves 。

34、sel by means of the jacking bolts on the feet of the vessel (25mm). 7.Remove Dome Valve by sliding sideways using lifting equipment if possible. Outlet Dome Valve 1.Fully close isolating valve and run the Ash Vessel until empty. 2.Shut down and isolate system. 3.Disconnect and mark nylon pneumatic p 。

35、ipework to the actuator and limit switch, and water pipework to the top adaptor/dome (high temperature models only). 4.Ensure pipework local to valve is supported and remove bolting from both Dome Valve adaptor flanges. 5.Remove Dome Valve by lowering and sliding sideways using lifting equipment if。

36、possible. Exhaust Dome Valve 1.Fully close isolating valve and run the Ash Vessel until empty. 2.Shut down and isolate system. 3.Disconnect and mark nylon pneumatic pipework to the actuator and limit switch, and water pipework to the top adaptor/dome (high temperature models only). 4.Remove bolting。

37、from both Dome Valve adaptor flanges, and remove the plate orifice and gasket. 5. Detach the bolt between bottom flange and vessel flange. 6. Remove Dome Valve using lifting equipment if possible. DOME VALVE MAINTENANCE INSTRUCTIONS Replacement/Inspection of Dome Valve Insert Seal 1.Remove set screw 。

38、s from top plate/adaptor, lift out the sealing head assembly consisting of top plate/adaptor, insert seal , insert ring and spigot ring . 2.Note the number and thickness of gaskets under the spigot ring. Combinations of 0.4mm, 0.8mm and 1.5mm thickness gaskets are fitted to achieve the required seal 。

39、 gap (between the seal and the dome). 3.Separate the seal from the insert ring and inspect for wear or damage. Replace immediately if necessary. 4.Rotate the dome by hand to check the condition of the bearings . If the bearings are seized or due for replacement proceed to Removal/Replacement of Dome 。

40、Valve Bearings. 5.When re-assembling the valve ensure that the underside of the top plate/adaptor is free from corrosion. All surfaces should be clean in order to form an air tight seal. 6.Lower the gaskets onto the valve body followed by the spigot ring and insert seal/ring . 7.Lower the top plate/ 。

41、adaptor into position taking care not to trap the seal, and tighten down. REMOVAL/REPLACEMENT OF DOME VALVE BEARINGS Vane Type Actuator Version 1.Remove the sealing head assembly. 2.Rotate the dome until it resets in a position halfway between open and closed. 3.Remove the set screws which attach th 。

42、e actuator mounting to the valve body and withdraw. 4.Remove the grease nipples. 5.Turn the valve through 180. 6.Punch out the two inner spring pins securing the dome to the shafts. 7.Withdraw the shafts and lift out the dome . Note if there are any shims present on the shafts. The shims are occasio 。

43、nally fitted at the factory for centralising the dome and should therefore be refitted on subsequent overhauls. 8.The bearings and seals can now be removed by driving them towards the centre of the valve. 9.All machined surfaces should now be thoroughly cleaned/degreased and inspected. 10. Check for 。

44、 surface irregularities in the dome and shafts and replace if necessary. Also de-burr the edges of the two holes and the leading edge of each drive shaft to prevent damage to the replacement seals/bearings on re-assembly. 11. Carefully fit the replacement seal into the locating ring so that the lip。

45、on the seal faces the chamfered leading edge of the locating ring. 12. Press the locating rings squarely into the bore. Offer the leading edge of the bearing up to the bore, align the hole in the bearing to the 1/8 NPT hole in the body. Press in squarely until the bearing sits approximately 3mm belo 。

46、w the face of the bore. Repeat for the other side. 13. Liberally pack the space between the seals and coat the bearings with Shell Malleus JB or equivalent. 14.Re-fit the shim(s) if applicable to the correct side of the valve, slide a new O ring (7) over the shafts up to the boss. 15. Slide the shaf 。

47、t through the bearing until it reaches the first seal in the bore. 16. Hold the dome adjacent to the bores and drive the shafts through the seals and the dome using a plastic/hide mallet. 17. Rotate the shafts until the holes in the shaft and the dome align. Grease the spring pins and drive in. 18.。

48、Turn the valve through 180. 19. Fit the grease nipples and the actuator. 20. Re-fit the sealing head assembly. 21. Limit Switch Setting Loosen the lock nut on the striker arm and wind up the set screw. With the dome fully closed wind out the screw until the hexagon head touches the plunger on the li 。

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标题：印尼|印尼棉兰2×200MW机组工程气力除灰输送系统设备操作手册总文本1( 三 )