20 صفحه pdfASME B16.33:2012Manually Operated Metallic Gas Valves for Use in Gas Piping Systems Up to 175 psi (Sizes NPS 1/2 Through NPS 2)
20 صفحه pdfASME B16.33:2012Manually Operated Metallic Gas Valves for Use in Gas Piping Systems Up to 175 psi (Sizes NPS 1/2 Through NPS 2)