1.1?This specification2 covers the application, design, and materials for valve locking devices. 1.2?Locking devices Types I and II described in this specification are designed to secure the valve in a fully opened or completely closed position. 1.3?This specification does not
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ASTM F993-21 history
2021ASTM F993-21 Standard Specification for Valve Locking Devices
2017ASTM F993-17 Standard Specification for Valve Locking Devices