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进口阀门试压相关要求和方法有哪些

进口阀门试压相关要求和方法有哪些

作者:admin    来源:未知    发布时间:2020-08-12 10:17    浏览量:
进口阀门试压相关要求和方法有哪些
What are the requirements and methods for pressure test of imported valves
 
      一般情况下,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DE LOCKE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。
 
Generally, the strength test is not required for industrial valves in use, but the valve body and bonnet or the valve body and bonnet damaged by corrosion after repair shall be tested. For the safety valve, its set pressure, return pressure and other tests shall comply with the specifications and relevant regulations. Strength and sealing test shall be carried out for valve installation. 20% of the low-pressure valves shall be sampled, and 100% inspection shall be conducted if the valves are unqualified; 100% inspection shall be conducted for medium and high-pressure valves. The commonly used media for valve pressure test include water, oil, air, steam, nitrogen, etc.
 
In this paper, combined with the famous import valve brand Germany Locke de lock valve pressure test standard requirements and procedures to analyze the valve pressure test related issues.
 
 
      一、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DE LOCKE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。
 
1、 Pressure test requirements of inlet valve:
 
 
1. Each valve shall be pressure tested before delivery. The famous import valve brand Germany rock de 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 chemical anti rust treatment without sealing effect and lining of lined valve are allowed. For the painted valve in stock, the coating need not be removed if the user's representative requests to repeat the pressure test.
 
3. Before the sealing test, the oil stains on the sealing surface should be removed, but a thin layer of protective agent whose viscosity is not greater than kerosene is allowed to be coated on the valve sealed by grease according to the design requirements.
 
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 should be between 5 ℃ and 40 ℃. However, in some valves which are required to meet the high temperature medium condition, the medium can also be used for test sealing.
 
6. The following test medium shall be selected by the manufacturer, but shall comply with the provisions in Table 1 and table 2; a liquid: water (antirust agent can be added), kerosene or other suitable liquid with viscosity not greater than; B gas: air or other suitable gas.
 
7. When testing with liquid, the gas in the valve chamber should be excluded. When using gas for test, safety protection measures should be adopted.
 
8. The sealing and upper sealing tests shall be closed in the way given by the design.
 
9. The test pressure shall meet the requirements.
 
      二、进口阀门压力试验方法及步骤
 
  应先进行上密封试验和壳体试验,然后进行密封试验
     1、 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。
 
2、 Pressure test method and procedure of inlet valve
 
 
 
The upper seal test and shell test shall be carried out first, and then the sealing test shall be carried out
 
1. Upper seal test
 
Seal the inlet and outlet of the valve, loosen the packing gland (if the valve is equipped with the upper seal inspection device, and the performance of the upper seal can be checked reliably without loosening the packing gland), the valve is in the fully open state, the upper seal is closed, the body cavity is filled with test medium, and the pressure is gradually increased to the test pressure, and then the upper sealing performance is checked
 
2. Shell test
 
Seal the inlet and outlet of the valve, compress 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 inspect the shell (including the stuffing box and the joint between the valve body and the valve cover).
 
 
      三、对相关的试压压力的术语的了解
 
     试验压力分壳体试验压力和密封试验压力两种。阀门进行壳体试验时规定的压力称为超额分配试验压力。阀门进行密封试验时规定的压力称为密封试验压力。
      《阀门的试验与检验》标准中规定:
 
     1、壳体试验压力为 38℃ 时公称压力的 1.5 倍。比如德国洛克DE LOCKE的公称压力1.6Mpa的进口球阀,它的壳体试验压力为2.4Mpa,2.5Mpa的进口截止阀,它的壳体试验压力为3.75Mpa
      2、高压密封试验和高压上密封试验压力为 38℃ 时公称压力的 1.1 倍。 比如德国洛克DE LOCKE的公称压力1.6Mpa的进口闸阀,进口电磁阀,他的高压密封试验和高压上密封试验压力为1.76Mpa
      3、低压密封试验和低压上密封试验压力为 0.5~0.7MPa。
      4、蝶阀的密封试验压力为 1.1 倍的额定压差。
      5、止回阀的密封试验压力为 38℃ 时的公称的压力。
      具体的不同类型的阀门的试压方法下回分析。
 
3、 Understanding of relevant terms of pressure test pressure
 
 
The test pressure is divided into shell test pressure and seal test pressure. The specified pressure for Shell Test of valve is called excess distribution test pressure. The specified pressure for valve sealing test is called sealing test pressure.
 
The standard of "valve test and inspection" stipulates that:
 
 
 
1. The shell test pressure is 1.5 times of the nominal pressure at 38 ℃. For example, for the imported ball valve with nominal pressure of 1.6Mpa in Germany, its shell test pressure is 2.4Mpa, and the shell test pressure of 2.5MPa inlet stop valve is 3.75mpa
 
2. The pressure of high pressure sealing test and high pressure upper sealing test is 1.1 times of the nominal pressure at 38 ℃. For example, Germany's Locke de Locke has a nominal pressure of 1.6Mpa for the inlet gate valve and the imported solenoid valve, and the pressure of its high-pressure sealing test and high-pressure upper sealing test is 1.76Mpa
 
3. The pressure of low pressure sealing test and low pressure upper sealing test is 0.5 ~ 0.7MPa.
 
4. The sealing test pressure of butterfly valve is 1.1 times of rated differential pressure.
 
5. The sealing test pressure of check valve is the nominal pressure at 38 ℃.
 
Specific different types of valve pressure test method back analysis.
 
 
 
 
 
 
 
 
 
 
 
 

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