a central spark plug location, no valve springs, and the carbon (or coke) build-up from burning low-quality gasoline (and ...

a subsidiary of the German operation, AZ-Armaturen Group, is, among other products, a manufacturer of high-quality, sleeved, self-lubricating plug valves which are intended primarily for use in ...

AZ supplied plug valves to the same mineral sands operation in 2007 ... valves are fitted with a polytetrafluoroethylene (PTFE) sleeve. This allows for AZ’s valves to operate in the harsh ...