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link 15.06.2009 13:35 |
Subject: Top and bottom trunnion bearings shall absorb thrust 9.2.2.7 Trunnion-Mounted Ball ValvesTrunnion ball valves shall have welded steel bodies with spherical center section without bolted bonnet joints. The valves shall have full ports. A block and bleed connection shall be mounted in the valve body. The spherical member shall close in a quarter turn and shall be supported by the stem. Top and bottom trunnion bearings shall absorb thrust due to line pressure. 9.2.2.7 Краны шаровые цапфовые |
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