MVME177PA-65SE备件库存
低压关闭试验6.4.1低压关闭试验应在阀座密封表面界面清洁且无油、油脂和密封剂的情况下进行。如有必要防止磨损，密封表面可涂上一层不比煤油重的油膜。该要求不适用于使用润滑剂作为主要密封件的阀门（如润滑旋塞阀）。6.4.2当观察到盖有水的关闭装置（阀盘、阀座和阀座环）出现气泡时，应检测阀座密封表面界面、阀座环后面或通过阀门开口侧阀盘的任何泄漏。表5-所需试验压力阀门尺寸的持续时间最小试验持续时间（秒）DN NPS外壳后座（对于具有后座功能的阀门）关闭止回阀（API 594）关闭其他阀门≤ 50≤ （2） 15 15 60 15 65至150（2 1/2至6）60 60 60 200至300（8至12）120 60 120≥ 350≥ （14） 300 60 120 120 a试验持续时间是阀门完全准备好并处于全压状态后的检查时间。版权所有美国石油学会由IHS根据API许可证提供，许可证持有人=阿尔伯塔大学/5966844001，用户=sam，albert未经IHS许可不得复制或联网，不得转售，2013年6月28日16:13:35 MDT---``，，，，```，如果可检测泄漏率等于表6中给出的泄漏率，则阀门制造商可以证明并验证该程序产生的结果与本标准的要求相当，并且该装置已通过买方和制造商之间的协议验收。
当用于大于DN 50（NPS 2）的阀门时，只有在买方同意的情况下，才可接受起泡器试验。当使用体积装置（起泡器）测量泄漏时，在通过试验管的流量建立并稳定之前，不得开始试验持续时间。应对装置进行校准，以产生相当于表6中所列单位/分钟的结果。应使用与生产试验相同的试验流体和温度对体积装置进行校准。表6-关闭试验的最大允许泄漏率阀门尺寸所有弹性阀座阀金属阀座阀（止回阀除外）DN（mm）NPS（in.）液体试验a（滴/分钟）气体试验（气泡/分钟）液体试验（cc/min）气体试验a（m3/h）气体试验b（ft3/h）对于液体试验，1mL被认为相当于16滴。b在规定的最小试验持续时间内，应无泄漏（见表5）。对于液体试验，0滴意味着在最小规定试验持续时间内无可见泄漏。对于气体试验，0个气泡意味着每最小规定试验持续时间少于1个气泡。版权所有美国石油学会由IHS根据API许可证提供，许可证持有人=阿尔伯塔大学/5966844001，用户=sam，albert未经IHS许可，不得复制或联网，不得转售，2013年6月28日16:13:35 MDT VALVE INSPECTION AND TESTING 11 6.4.3关闭测试闸阀、旋塞阀和球阀时，应使用一种测试阀座泄漏的方法，该方法应使用测试流体填充阀体空腔并将其完全加压至阀座和阀盖区域之间的测试压力（如适用）。这将确保在试验期间，由于这些容积的逐渐填充，阀座泄漏不会逃过检测。
Low pressure closing test 6.4.1 The low pressure closing test shall be conducted when the sealing surface interface of the valve seat is clean and free of oil, grease and sealant. If necessary, the sealing surface can be coated with an oil film not heavier than kerosene. This requirement does not apply to valves that use lubricant as the primary seal (e.g., lubricated plug valves). 6.4.2 When bubbles are observed in the closing device (valve disc, valve seat and valve seat ring) covered with water, any leakage at the sealing surface interface of the valve seat, behind the valve seat ring or through the valve disc at the opening side of the valve shall be detected. Table 5 - Duration of required test pressure Valve size Minimum test duration (s) DN NPS shell backseat (for valves with backseat function) Close check valve (API 594) Close other valves ≤ 50 ≤ (2) 15 15 60 15 65 to 150 (2 1/2 to 6) 60 60 200 to 300 (8 to 12) 120 60 120 ≥ 350 ≥ (14) 300 60 120 a Test duration is the inspection time after the valve is fully prepared and in full pressure state. Copyright American Petroleum Institute is provided by IHS according to the API license. The licensee=University of Alberta/5966844001, the user=sam, albert, without permission from IHS, shall not be copied or networked, and shall not be resold. On June 28, 2013, 16:13:35 MDT -- ` `,,, ` `. If the detectable leakage rate is equal to the leakage rate given in Table 6, the valve manufacturer can prove and verify that the results generated by this procedure are equivalent to the requirements of this standard, And the device has passed the agreement acceptance between the buyer and the manufacturer.
When used for valves larger than DN 50 (NPS 2), the bubbler test can be accepted only with the consent of the Buyer. When a volumetric device (bubbler) is used to measure leakage, the test duration shall not commence until the flow through the test tube has been established and stabilized. The device shall be calibrated to produce a result equivalent to the units/minute listed in Table 6. The volumetric apparatus shall be calibrated using the same test fluid and temperature as the production test. Table 6 - Maximum allowable leakage rate for closing test Valve size All flexible seat valves Metal seat valves (except check valves) DN (mm) NPS (in.) Liquid test a (drop/minute) Gas test (bubble/minute) Liquid test (cc/min) Gas test a (m3/h) Gas test b (ft3/h) For liquid test, 1mL is considered to be equivalent to 16 drops. B There shall be no leakage within the specified minimum test duration (see Table 5). For liquid tests, 0 drop means no visible leakage for the minimum specified test duration. For gas tests, 0 bubble means less than 1 bubble per minimum specified test duration. Copyright American Petroleum Institute is provided by IHS according to API license. Licensee=University of Alberta/5966844001, user=sam, albert, without license from IHS, cannot be copied or networked, and cannot be resold. On June 28, 2013, 16:13:35 MDT VALVE INSPECTION AND TESTING 11 6.4.3 When closing test gate valves, plug valves, and ball valves, a method for testing seat leakage should be used, This method shall use the test fluid to fill the body cavity and fully pressurize it to the test pressure between the seat and bonnet area, as applicable. This will ensure that valve seat leakage will not escape detection due to gradual filling of these volumes during the test.
