标准摘要
[中文适用范围]： 建立了一系列适用于控制阀特定设计的阀座泄漏等级，并定义了测试程序。 [外文原描述]： Establishes a series of seat leakage classes for application to specific designs of control valves and defines the test procedures.
英文名称Amendment 1 - Industrial-process control valves. Part 4: Inspection and routine testing