What do national standards stipulate regarding the installation of ball valve stems?

Date: 2025-12-31Views: 2275

National Standard GB/T 12237, “Steel Ball Valves for the Petroleum, Petrochemical, and Related Industries,” stipulates that the ball valve stem shall be designed such that, under the pressure of the medium, the stem will not be forced out of the valve body even when the stem packing is removed (e.g., when the packing gland is removed).