（Relevant requirements and methods for pressure test of imported valves）
工业阀门在使用时不做强度试验，但修补过后阀体和阀盖或腐蚀损伤的阀体和阀盖应做强度试验。对于安全阀，其整定压和回座压力及其他试验应符合其说明书和有关规程的规定。阀门安装之彰应作强度和密封性试验。低压阀门抽查20%，如不合格应100%的检查;中、高压阀门应100%的检查。阀门试压常用的介质有水、油、空气、蒸汽、氮气等。
本文将结合著名的进口阀门品牌德国洛克阀门的试压标准要求以及步骤程序来分析下阀门的试压相关问题。
（Industrial valves are not subject to strength test in use, but after repair, the valve body and bonnet or the valve body and bonnet damaged by corrosion shall be subject to strength test. For safety valve, its set pressure, reseating pressure and other tests shall conform to the specifications and relevant regulations. The valve shall be tested for strength and tightness during installation. Spot check 20% of low-pressure valves, 100% of unqualified ones; 100% of medium and high-pressure valves. The commonly used media for valve pressure test are water, oil, air, steam, nitrogen, etc.）
（In this paper, the famous imported valve brand German Rockwell valve pressure test standard requirements and procedures to analyze the pressure test related issues.）
一、进口阀门压力试验方法
1、应先进行上密封试验和壳体试验，然后进行密封试验
上密封试验
封闭阀门进口和出口，放松填料压盖（如果阀门设有上密封检查装置，且在不放松填料压盖的情况下能够可靠地检查上密封的性能，则不必放松填料压盖），阀门处于全开状态，使上密封关闭，给体腔充满试验介质，并逐渐加压到试验压力，然后检查上密封性能
2、壳体试验
封闭阀门进口和出口，压紧填料压盖以便保持试验压力，启闭件处于部分开启状态。给体腔充满试验介质，并逐渐加压到试验压力（止回阀应从进口端加压），然后对壳体（包括填料函及阀体与阀盖联结处）进行检查。
1、 Pressure test method for inlet valves
（1）. The upper sealing test and shell test shall be carried out first, and then the sealing test shall be carried out
Upper seal test
Close the inlet and outlet of the valve, loosen the packing gland (if the valve is equipped with an upper sealing inspection device, and the upper sealing performance can be reliably checked without loosening the packing gland, it is not necessary to loosen the packing gland). The valve is in a fully open state, so that the upper sealing is closed, the body cavity is filled with test medium, and gradually pressurized to the test pressure, and then check the upper sealing performance
（2）. Shell test
Close the inlet and outlet of the valve, press the packing gland to maintain the test pressure, and the opening and closing parts are partially open. Fill the chamber with test medium and gradually pressurize it to the test pressure (the check valve shall be pressurized from the inlet end), and then check the shell (including the stuffing box and the connection between the valve body and the valve cover).
二、进口阀门压力试验要求：
1.每台阀门出厂前均应进行压力试验。著名的进口阀门品牌德国洛克严格执行此标准。
2.在壳体试验完成之前，不允许对阀门涂漆或使用其它防止渗漏的涂层，但允许进行无密封作用的化学防锈处理及给衬里阀衬里。对于已涂过漆的库存阀门，如果用户代表要求重做做压力试验时，则不需除去涂层。
3.密封试验之前，应除去密封面上的油渍，但允许涂一薄层粘度不大于煤油的防护剂，靠油脂密封的阀门，允许涂敷按设计规定选用的油脂。
4.试验过程中不应使阀门受到可能影响试验结果的外力。
5.如无特殊规定，试验介质的温度应在5~40℃之间。但在一些要求满足高温介质工况的阀门中，也可以采用采用介质进行试验密封。
6.下列试验介质由制造厂自行选择，但应符合表1和表2的规定；a液体：水（可以加入防锈剂），煤油或粘度不大于的其它适宜液体；b气体：空气或其它适宜的气体。
7.用液体作试验时，应排除阀门腔体内的气体。用气体作试验时，应采用安全防护措施。
8.进行密封和上密封试验时，应以设计给定的方式关闭。
9.试验压力应符合规定。
2、 Requirements for pressure test of inlet valve:
（1）. Pressure test shall be conducted for each valve before delivery. The famous brand of imported valves, Germany lock, strictly implements this standard.
（2）. Before the completion of shell test, it is not allowed to paint the valve or use other anti leakage coating, but it is allowed to carry out chemical anti rust treatment without sealing effect and lining the lined valve. For painted stock valves, if the user's representative requires to redo the pressure test, the coating does not need to be removed.
（3）. Before the sealing test, remove the oil stains on the sealing surface, but it is allowed to apply a thin layer of protective agent whose viscosity is not greater than kerosene. For the valve sealed by oil, it is allowed to apply the oil selected according to the design regulations.
（4）. During the test, the valve shall not be subject to external forces that may affect the test results.
（5）. Unless otherwise specified, the temperature of the test medium shall be between 5-40 ℃. However, in some valves which need to meet the working condition of high temperature medium, the medium can also be used for test sealing.
（6）. The following test media shall be selected by the manufacturer, but shall meet the requirements of Table 1 and table 2; a liquid: water (antirust agent can be added), kerosene or other suitable liquid with viscosity no more than; B gas: air or other suitable gas.
（7）. When testing with liquid, the gas in the valve chamber shall be removed. When gas is used for test, safety protection measures shall be taken.
（8）. During the sealing and upper sealing test, it shall be closed in the way given in the design.
（9）. The test pressure shall meet the requirements
