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Replaceable Steam Chest Valve Liners are standard equipment in all Vulcan Single and Differential Acting Pile Hammers These Valve Liners were adopted to provide easy means of replacing worn surfaces in the Steam Chest in lieu of reboring.
Given below in the table are the Serial Numbers and dates of the first hammer in each size to be equipped with Valve Liners. All hammers with Serial Numbers subsequent to those given for each size of Hammer are equipped with Valve Liners.
As changes take place. additional data will be provided.
Note: This was never followed up on. But in reality there was no need to, as virtually any Vulcan hammer made after 1970 (those with a serial number starting with a "G", "H" or "I") had a valve liner. In addition to providing a replaceable wear surface, the valve liner eliminated the need to cut the valve stems custom for each hammer by providing a consistent location for the ports.
Vulcan's serial number system is explained in Offshore Tip No. 016 -- click here for details.