B-1 This standard establishes the dimensions of interchangeability, the characteristics and the requirements that must be met by cast bronze steam valves, series 21 (commercially damaged class 300).
IRAM-IAP A 25-16-1961 history
1961IRAM-IAP A 25-16-1961 Argentine Petroleum Research Center gas-cast copper gate (half condition size interchangeable for model 21)