Abstract
The valve seat grinding and lapping of metal to metal seated blowdown valves has been a major problem in valve maintenance. It was basically because of the limited space available for a tool to reach tile seat sealing surface. This needed a special tool made for a specific valve design and for a given machining operation. Therefore wherever the valve seat needed machining, it had been a normal practice to discard the value altogether for economic reasons. This had been a repetitive problem with the blow down valves of a high pressure helium repurifler, which are expensive and are not readily available. For such applications it was felt desirable to have a valve seat that could be removed and machined or replaced, depending upon tile extent of seat deterioration.
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