MVME177PA-67SE备件库存
制造商应证明阀杆密封件能够保持至少等于38°C（100°F）阀门额定值的压力，且无明显泄漏。版权所有美国石油学会由IHS提供，经API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——阀门检查和测试7 5.9.1.4对于带有不可调节阀杆密封件（O形圈、固定单环等）的阀门，外壳试验期间不允许出现肉眼可见的泄漏。5.9.1.5如果不允许目视检测到泄漏，则以下定义适用：a）如果试验流体为液体，则试验阀的外表面应无明显的滴落或润湿迹象；b） 如果测试流体是空气或惰性气体，则建立的检测方法不会显示泄漏。5.9.2关闭5.9.2.1对于低压关闭试验和高压关闭试验，不允许通过阀盘、阀座环后面或轴封（具有该特征的阀门）出现泄漏的视觉证据，也不允许出现结构损坏。【弹性阀座和密封件的塑性（永久）变形不视为结构损坏。】在试验期间，阀座密封表面界面处试验流体的允许泄漏率，5.9.2.2非金属（如陶瓷）阀座材料阀门关闭试验的允许泄漏率应等于表6中规定的同等尺寸和类型的金属阀座阀门的泄漏率。
表3—外壳试验压力阀门类型等级外壳试验压力（最小）巴表压磅/平方英寸表压（psig）球墨铸铁34将螺纹端阀限制在2500级及以下。b根据ASME B16.34.c，对于800级阀门，壳体试验压力应为38°c（100°F）时额定压力的1/2倍，四舍五入至下一个更高的bar（25 psig）（见API 602表2）。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，8 API标准598 6压力测试程序6.1一般6.1.1设计用于紧急或补充向阀座区域注入可注射密封剂的阀门应在注入系统为空且未使用的情况下进行测试，但润滑旋塞阀除外。6.1.2当液体用作试验流体时，阀门在试验过程中应基本上没有截留空气。6.1.3在检查或压力测试之前，不得在任何表面上涂敷可能掩盖表面缺陷的所需保护涂层，如油漆。（用于保护阀门表面的磷化和类似化学转化工艺，即使在试验前进行，也可以接受，但前提是它们不会密封气孔。）表4—其他试验压力试验压力d巴表压磅/平方英寸表压（psig）阀门（蝶阀和止回阀除外）高压关闭和bb低压关闭和4至760至100蝶阀高压关闭c c低压关闭4至7 60至100止回阀高压关闭125级（铸铁）DN 50至300（NPS 2至12）14 200 DN 350至1200（NPS 14至48）
The manufacturer shall demonstrate that the stem seal is capable of maintaining a pressure at least equal to the valve rating of 38 ° C (100 ° F) without significant leakage. Copyright American Petroleum Institute is provided by IHS. API licensees=University of Alberta/5966844001, users=sam, albert, without permission from IHS, are not allowed to copy, network or resell. On June 28, 2013, 16:13:35 MDT - Valve Inspection and Testing 7 5.9.1.4 For valves with non adjustable stem seals (O-ring, fixed single ring, etc.), no visible leakage is allowed during shell test. 5.9.1.5 If visual detection of leakage is not allowed, the following definitions apply: a) If the test fluid is liquid, the external surface of the test valve shall have no obvious signs of dripping or wetting; b) If the test fluid is air or inert gas, the established test method will not show leakage. 5.9.2 Closing 5.9.2.1 For low pressure closing test and high pressure closing test, no visual evidence of leakage through valve disc, back of valve seat ring or shaft seal (valve with this feature) is allowed, and no structural damage is allowed. [Plastic (permanent) deformation of resilient seats and seals shall not be considered as structural damage.] During the test, the allowable leakage rate of the test fluid at the interface of the sealing surface of the valve seat, 5.9.2.2 The allowable leakage rate of the valve closure test for non-metallic (such as ceramic) seat materials shall be equal to the leakage rate of metal seat valves of the same size and type specified in Table 6.
Table 3 - Case Test Pressure Valve Type Class Case Test Pressure (minimum) bar gauge pounds per square inch gauge (psig) Ductile Iron 34 limits threaded end valves to Class 2500 and below. B According to ASME B16.34. c, for Class 800 valves, the shell test pressure shall be 1/2 times the rated pressure at 38 ° c (100 ° F), rounded to the next higher bar (25 psig) (see API 602 Table 2). Copyright American Petroleum Institute is provided by IHS according to API license, licensee=University of Alberta/5,966,844,001, user=sam, albert, without permission of IHS, shall not be copied or networked, and shall not be resold. 8 API standard 598 6 Pressure test procedure 6.1 General 6.1.1 Valves designed for emergency or supplementary injection of injectable sealant into the valve seat area shall be tested when the injection system is empty and unused, Except for lubricating plug valve. 6.1.2 When the liquid is used as the test fluid, the valve shall basically not retain air during the test. 6.1.3 Before inspection or pressure test, the required protective coating, such as paint, which may cover surface defects, shall not be applied on any surface. (Phosphating and similar chemical conversion processes used to protect valve surfaces, even before testing, are acceptable, provided they do not seal pores.) Table 4 - Other test pressures Test pressure d bar gauge pounds per square inch gauge (psig) Valves (except butterfly and check valves) High pressure closure and bb Low pressure closure and 4 to 760 to 100 butterfly valves High pressure closure c Low pressure closure 4 to 7 60 to 100 check valves High pressure closure Class 125 (cast iron) DN 50 to 300 (NPS 2 to 12) 14 200 DN 350 to 1200 (NPS 14 to 48)
