阀门安装前的检查
Inspection before valve installation
①仔细检查核对阀门型号、规格是否符合图纸要求。
① Carefully check whether the valve model and specification meet the drawing requirements.
②检查阀杆和阀瓣开启是否灵活，有无卡住和歪斜现象。
② Check whether the valve stem and disc can be opened flexibly and whether they are stuck or skewed.
③检查阀门有无损坏，螺纹阀门的螺纹是否端正和完整无缺。
③ Check whether the valve is damaged and whether the thread of the threaded valve is straight and complete.
④检查阀座与阀体的结合是否牢固，阀瓣与阀座、阀盖和阀体,阀杆与阀瓣的联结。
④ Check whether the connection between the valve seat and the valve body is firm, the connection between the valve disc and the valve seat, the valve cover and the valve body, and the connection between the valve stem and the valve disc.
⑤检查阀门垫料、填料及紧固件(螺栓)是否适合于工作介质性质的要求。
⑤ Check whether the valve padding, packing and fasteners (bolts) are suitable for the nature of the working medium.
⑥对陈旧的或搁置较久的减压阀应拆卸，灰尘、砂粒等杂物须用水清洗干净。
⑥ The pressure reducing valve that is old or has been used for a long time shall be disassembled, and the dust, sand and other sundries must be cleaned with water.
⑦通口封盖，检查密封程度，阀瓣必须关闭严密。
⑦ Clean the port cover and check the sealing degree. The valve flap must be closed tightly.
阀门的压力试验
Pressure test of valve
低压、中压和高压阀门要进行强度试验和严密性试验，合金钢阀门还应逐个对壳体进行光谱分析，复查材质。
Low pressure, medium pressure and high pressure valves shall undergo strength test and tightness test. Alloy steel valves shall also undergo spectral analysis on the shells one by one and recheck the materials.
1.阀门的强度试验
1. Strength test of valve
阀门的强度试验是在阀门开启状态下试验，检查阀门外表面的渗漏情况。PN≤32MPa的阀门，其试验压力为公称压力的1.5倍，试验时间不少于5min，壳体、填料压盖处无渗漏为合格。
The strength test of the valve is conducted when the valve is open to check the leakage of the external surface of the valve. For valves with PN ≤ 32MPa, the test pressure is 1.5 times of the nominal pressure, the test time is not less than 5min, and the valves are qualified if there is no leakage at the shell and packing gland.
2.阀门的严密性试验
2. Tightness test of valve
在阀门完全关闭状态下进行的试验，检查阀门密封面是否有渗漏，其试验压力，除蝶阀、止回阀、底阀、节流阀外的阀门，一般应以公称压力进行，在能够确定工作压力时，也可用1.25倍的工作压力进行试验，以阀瓣密封面不漏为合格。
When the valve is fully closed, check whether there is leakage on the sealing surface of the valve. The test pressure of valves other than butterfly valves, check valves, bottom valves and throttle valves should generally be at the nominal pressure. If the working pressure can be determined, the test can also be conducted at 1.25 times of the working pressure. If the sealing surface of the valve disc does not leak, it is qualified.
The above is a detailed introduction to Lianggong Valve, and we hope it will be helpful to you. If you have any questions, please contact us. We will provide you with our attitude //m.rabieb.com
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