天燃气阀如何进行开启压力的调整？
How to adjust the opening pressure of natural gas safety valve?
天燃气阀如何进行开启压力的调整？天燃气阀在系统中起保护作用。当系统压力超过规定值时，天燃气阀汀开，将系统中的一部分气体排入大气，使系统压力不超过允许值，从而确保系统不因压力过高而发生事故。
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天燃气阀出厂前，应逐台调整其开启压力到用户要求的整定值。若用户提出弹簧工作压力级，则按一般应按压力级的下限值调整出厂。
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使用者在将阀安装到被保护设备上之前或者在安装之前，在安装现场重新进行调整，以确保阀的整定压力值符合要求。
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在铭牌注明的弹簧工作压力级范围内，通过旋转调整螺杆改变弹簧压缩量，即可对开启压力进行调节。
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在旋转调整螺杆之前，应使阀进口压力降低到开启压力的 90％以下，以防止旋转调整螺杆时阀瓣被带动旋转，以致损伤密封面。
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为确保开启压力值准确，应使调整时的介质条件，如介质种类、温度等尽可能接近实际运行条件。介质种类改变，特别是当介质聚积态不同时（例如从液相变为气相），开启压力常有所变化。工作温度升高时，开启压力一般有所降低。故在常温下调整而用于高温时，常温下的整定压力值应略高于要求的开启压力值。高到什么程度与阀门结构和材质选用都有关系，应以制造厂的说明为根据。
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常规阀用于固定附加背压的场合，当在检验后调整开启压力时（此时背压为大气压），其整定值应为要求的开启压力值减去附加背压值。
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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