天燃氣安全閥如何進行開啟壓力的調整？
How to adjust the opening pressure of natural gas safety valve?
天燃氣安全閥如何進行開啟壓力的調整？天燃氣安全閥在系統中起安全保護作用。當系統壓力超過規定值時，天燃氣安全閥汀開，將系統中的一部分氣體排入大氣，使系統壓力不超過允許值，從而確保系統不因壓力過高而發生事故。
How to adjust the opening pressure of natural gas safety valve? The natural gas safety valve plays a role of safety protection in the system. When the system pressure exceeds the specified value, the natural gas safety valve will be opened to discharge part of the gas in the system into the atmosphere, so that the system pressure does not exceed the allowable value, so as to ensure that the system will not have accidents due to high pressure.
①天燃氣安全閥出廠前，應逐臺調整其開啟壓力到用戶要求的整定值。若用戶提出彈簧工作壓力級，則按一般應按壓力級的下限值調整出廠。
① Before leaving the factory, the opening pressure of natural gas safety valves should be adjusted one by one to the setting value required by the user. If the user proposes the working pressure level of the spring, it should generally be adjusted according to the lower limit of the pressure level.
②使用者在將安全閥安裝到被保護設備上之前或者在安裝之前，在安裝現場重新進行調整，以確保安全閥的整定壓力值符合要求。
② The user shall readjust the safety valve on the installation site before installing it on the protected equipment or before installation to ensure that the set pressure value of the safety valve meets the requirements.
③在銘牌注明的彈簧工作壓力級范圍內，通過旋轉調整螺桿改變彈簧壓縮量，即可對開啟壓力進行調節。
③ Within the range of spring working pressure level indicated on the nameplate, the opening pressure can be adjusted by rotating the adjusting screw to change the spring compression.
④在旋轉調整螺桿之前，應使閥進口壓力降低到開啟壓力的 90％以下，以防止旋轉調整螺桿時閥瓣被帶動旋轉，以致損傷密封面。
④ Before rotating the adjusting screw, the valve inlet pressure should be reduced to less than 90% of the opening pressure to prevent the valve disc from being driven to rotate when rotating the adjusting screw, so as to damage the sealing surface.
⑤為確保開啟壓力值準確，應使調整時的介質條件，如介質種類、溫度等盡可能接近實際運行條件。介質種類改變，特別是當介質聚積態不同時（例如從液相變為氣相），開啟壓力常有所變化。工作溫度升高時，開啟壓力一般有所降低。故在常溫下調整而用于高溫時，常溫下的整定壓力值應略高于要求的開啟壓力值。高到什么程度與閥門結構和材質選用都有關系，應以制造廠的說明為根據。
⑤ In order to ensure the accuracy of the opening pressure value, the medium conditions during adjustment, such as medium type and temperature, should be as close to the actual operating conditions as possible. The type of medium changes, especially when the accumulation state of the medium is different (for example, from liquid phase to gas phase), the opening pressure often changes. When the working temperature rises, the opening pressure generally decreases. Therefore, when it is adjusted at room temperature and used at high temperature, the set pressure value at room temperature should be slightly higher than the required opening pressure value. How high is related to the valve structure and material selection, which should be based on the manufacturer's instructions.
⑥常規安全閥用于固定附加背壓的場合，當在檢驗后調整開啟壓力時（此時背壓為大氣壓），其整定值應為要求的開啟壓力值減去附加背壓值。
⑥ The conventional safety valve is used to fix the additional back pressure. When the opening pressure is adjusted after inspection (at this time, the back pressure is atmospheric pressure), its setting value should be the required opening pressure value minus the additional back pressure value.
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