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進口閥門試壓相關要求和方法有哪些

進口閥門試壓相關要求和方法有哪些

作者:admin????來源:????發布時間:2020-08-12 10:17????瀏覽量:
進口閥門試壓相關要求和方法有哪些
What are the requirements and methods for pressure test of imported valves
 
      一般情況下,工業閥門在使用時不做強度試驗,但修補過后閥體和閥蓋或腐蝕損傷的閥體和閥蓋應做強度試驗。對于安全閥,其整定壓和回座壓力及其他試驗應符合其說明書和有關規程的規定。閥門安裝之彰應作強度和密封性試驗。低壓閥門抽查20%,如不合格應100%的檢查;中、高壓閥門應100%的檢查。閥門試壓常用的介質有水、油、空氣、蒸汽、氮氣等。
      本文將結合著名的進口閥門品牌德國洛克DE LOCKE閥門的試壓標準要求以及步驟程序來分析下閥門的試壓相關問題。
 
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、進口閥門壓力試驗要求:
 
  1.每臺閥門出廠前均應進行壓力試驗。著名的進口閥門品牌德國洛克DE LOCKE嚴格執行此標準。
  2.在殼體試驗完成之前,不允許對閥門涂漆或使用其它防止滲漏的涂層,但允許進行無密封作用的化學防銹處理及給襯里閥襯里。對于已涂過漆的庫存閥門,如果用戶代表要求重做做壓力試驗時,則不需除去涂層。
  3.密封試驗之前,應除去密封面上的油漬,但允許涂一薄層粘度不大于煤油的防護劑,靠油脂密封的閥門,允許涂敷按設計規定選用的油脂。
  4.試驗過程中不應使閥門受到可能影響試驗結果的外力。
  5.如無特殊規定,試驗介質的溫度應在5~40℃之間。但在一些要求滿足高溫介質工況的閥門中,也可以采用采用介質進行試驗密封。
  6.下列試驗介質由制造廠自行選擇,但應符合表1和表2的規定;a液體:水(可以加入防銹劑),煤油或粘度不大于的其它適宜液體;b氣體:空氣或其它適宜的氣體。
  7.用液體作試驗時,應排除閥門腔體內的氣體。用氣體作試驗時,應采用安全防護措施。
  8.進行密封和上密封試驗時,應以設計給定的方式關閉。
  9.試驗壓力應符合規定。
 
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、進口閥門壓力試驗方法及步驟
 
  應先進行上密封試驗和殼體試驗,然后進行密封試驗
     1、 上密封試驗
      封閉閥門進口和出口,放松填料壓蓋(如果閥門設有上密封檢查裝置,且在不放松填料壓蓋的情況下能夠可靠地檢查上密封的性能,則不必放松填料壓蓋),閥門處于全開狀態,使上密封關閉,給體腔充滿試驗介質,并逐漸加壓到試驗壓力,然后檢查上密封性能
  2、殼體試驗
  封閉閥門進口和出口,壓緊填料壓蓋以便保持試驗壓力,啟閉件處于部分開啟狀態。給體腔充滿試驗介質,并逐漸加壓到試驗壓力(止回閥應從進口端加壓),然后對殼體(包括填料函及閥體與閥蓋聯結處)進行檢查。
 
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、對相關的試壓壓力的術語的了解
 
     試驗壓力分殼體試驗壓力和密封試驗壓力兩種。閥門進行殼體試驗時規定的壓力稱為超額分配試驗壓力。閥門進行密封試驗時規定的壓力稱為密封試驗壓力。
      《閥門的試驗與檢驗》標準中規定:
 
     1、殼體試驗壓力為 38℃ 時公稱壓力的 1.5 倍。比如德國洛克DE LOCKE的公稱壓力1.6Mpa的進口球閥,它的殼體試驗壓力為2.4Mpa,2.5Mpa的進口截止閥,它的殼體試驗壓力為3.75Mpa
      2、高壓密封試驗和高壓上密封試驗壓力為 38℃ 時公稱壓力的 1.1 倍。 比如德國洛克DE LOCKE的公稱壓力1.6Mpa的進口閘閥,進口電磁閥,他的高壓密封試驗和高壓上密封試驗壓力為1.76Mpa
      3、低壓密封試驗和低壓上密封試驗壓力為 0.5~0.7MPa。
      4、蝶閥的密封試驗壓力為 1.1 倍的額定壓差。
      5、止回閥的密封試驗壓力為 38℃ 時的公稱的壓力。
      具體的不同類型的閥門的試壓方法下回分析。
 
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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