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(diào)整？天燃氣安全閥在系統(tǒng)中起安全保護作用。當(dāng)系統(tǒng)壓力超過規(guī)定值時，天燃氣安全閥汀開，將系統(tǒng)中的一部分氣體排入大氣，使系統(tǒng)壓力不超過允許值，從而確保系統(tǒng)不因壓力過高而發(fā)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(yīng)逐臺調(diào)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(yīng)按壓力級的下限值調(diào)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(shè)備上之前或者在安裝之前，在安裝現(xiàn)場重新進行調(diào)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(nèi)，通過旋轉(zhuǎn)調(diào)整螺桿改變彈簧壓縮量，即可對開啟壓力進行調(diào)節(jié)。

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(zhuǎn)調(diào)整螺桿之前，應(yīng)使閥進口壓力降低到開啟壓力的 90％以下，以防止旋轉(zhuǎn)調(diào)整螺桿時閥瓣被帶動旋轉(zhuǎn)，以致?lián)p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(zhǔn)確，應(yīng)使調(diào)整時的介質(zhì)條件，如介質(zhì)種類、溫度等盡可能接近實際運行條件。介質(zhì)種類改變，特別是當(dāng)介質(zhì)聚積態(tài)不同時（例如從液相變?yōu)闅庀啵_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(diào)整而用于高溫時，常溫下的整定壓力值應(yīng)略高于要求的開啟壓力值。高到什么程度與閥門結(jié)構(gòu)和材質(zhì)選用都有關(guān)系，應(yīng)以制造廠的說明為根據(jù)。

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(guī)安全閥用于固定附加背壓的場合，當(dāng)在檢驗后調(diào)整開啟壓力時（此時背壓為大氣壓），其整定值應(yīng)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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