Method And Device For Disc Lapping Used In High Temperature And High Pressure Application Valves

Abstract: The invention relates to Safety valves which are used to safeguard the damage of steam boiler drum, superheater , reheater and other pressure relief applications. The lapping operation of Disk in Safety valve is carried out manually which is more time consuming and leads to operator fatigue. The surface finish quality was also not up to the mark. Hence a suitable method was developed .The method is performed by a suitable fixture developed which is compatible with drilling machine. The improved new lapping technique gives optimum cycle time reduction and enhanced product quality. The new process can be performed by any machinist thereby reducing the dependency on high skilled labour. Fatigue and rework/rejection level is also minimised. The newly developed fixture can be used for lapping of different types of safety valve disc and irrespective of the pressure ratings. Five jobs were finished in one shift using the device compared to one job in manual Lapping process .The lapping device developed is made from stainless steel material and provided with six numbers of equispaced lapping pins which are pasted with abrasive stickers of fine grade .The lapping pins are assembled with ball bearings at the bottom and thrust bearings on the top side and tightened with locking stud. The device is connected to Drilling machine spindle socket using an adapter.

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