[精品]调节阀泄漏量测试标准

4 LEAKAGE SPECIFICAITONS AND CLASSES 泄漏等级和相关规定 4.1 The maximum allowable seat leakage as specified for each class shall not exceed the set leakage in Table 1 using the test procedure as defined in Section 5. For Classes II through VI , each and every valve shall be tested . 在表1中给出不同的泄漏等级的最大泄漏量，并按第五部分所要求的测试程序去测试。要 达到等级2到等级6中的任一等级，每一个阀都必须测试。 4.2 Leakage Classes 泄漏等级 4.2.1 Class I. A modification of any Class II ,111 or IV valve where design intent is the same as the basic class , but by agreement between user and supplier , no test is required . 一级密封 是根据等级二，三，四来设计制造的，但是供方和用户已达成协议不需要测试。 4.2.2 Class II. This class establishes the maximum permissible leakage generally associated with commercial double port, double seat control valves or balanced single port control valves with a piston ring seal and metal to metal seats . Use test procedure Type A. 二级密封 主要是针对 工业双通双座控制阀或平衡型单通控制阀那些带有活塞O型圈密 封和金属对金属阀座密封。使用A类测试程序。 4.2.3 Class III This class establishes the maximum permissible leakage generally associated with Class II 4.2.2, but a higher degree of seat and seal tightness . Use test procedure Type A. 三级密封主要是针对那些阀座和密封硬度更高的二级密封所规定的相关的阀。规定了最大 允许的最大泄漏量。使用A类测试程序。 4.2.4 Class IV This class establishes the maximum permissible leakage generally associated with commercial unbalanced single-port , single-seat control valves and balanced single-port control valves with extra tight piston rings or other sealing means and metal to metal seats. Use test procedure Type A. 四级密封 主要是针对工业非平衡单孔单座控制阀和平衡型单孔控制阀带有紧固型活塞式 密封圈或其他密封形式和金属密封，规定了最大允许泄漏量。使用A类测试程序。 4.2.5 Class V This class is usually specified for critical applications where the control valve may be required to be closed , without a blocking valve , for long period of time with high differential pressure across the seating surfaces . It requires special manufacturing assembly and testing techniques . This class is generally associated with metal seat unbalanced single-port, single seat control valves or balanced single port designs with exceptional seat and seal tightness . Use test procedure Type B using water at the maximum operating differential pressure. 五级密封主要是针对那些临界设备，不带截止阀，而控制阀要长期关闭，并有高速介质流 过阀座表面。此类阀要求特殊的加工安装和测试技术。相关的控制阀有非平衡型单孔单座控 制阀或平衡型单孔设计阀并且阀座和密封需要额外的硬化处理。使用测试程序B。测试介 质为水，并且在最大的操作压差测试。 4.2.6 Class VI This class establishes the maximum permissible seat leakage generally associated with resilient seating control valves either unbalanced or balanced single port with O rings or similar gapless seals . Use test procedure Type C . 六级密封 此等级规定了非平衡型或平衡型单孔带0形圈或相似无缝软阀座密封的控制 阀的最大允许阀座泄漏量。使用C类测试程序 Table 1 表一 Leakage Class 泄漏等级 Maximum Seat Leakage 最大阀座泄漏量 Test Procedure 测试程序 Class I 一级 See Paragraph 4.2 J None See 4.2.1 见4.2.1部份 没有 Class II 二级 0.5 of rated valve capacity Type A See4.2.2 0.5的额定流量 See 5.1 Class III 二级 0.1 of rated valve capacity Type A See4.2.3 0.1 的额定流量 See 5.1 Class IV 四级 0.01 of rated valve capacity Type A See 4.2.4 0.01的额定流量 See 5.1 Cl