General requirements for pneumatic check valves
Classification:
Release Time：2018-03-05
1, the production of pneumatic valve specifications and categories, should meet the requirements of the pipeline design documents. 2. The type of pneumatic valve should indicate the requirements of the national standard number. If it is an enterprise standard, the relevant description of the model should be indicated. 3. The working pressure of the pneumatic valve is required to be ≥ the working pressure of the pipeline. On the premise of not affecting the price, the working pressure that the valve can bear should be greater than the actual working pressure of the pipeline. Any side of the pneumatic valve closed should be able to withstand 1.1 times the valve pressure value without leakage. Under the condition of valve opening, the valve body should be able to withstand twice the valve pressure. 4, pneumatic valve manufacturing standards, should explain the basis of the national standard number or enterprise standards. 5,
1, the production of pneumatic valve specifications and categories, should meet the requirements of the pipeline design documents.
2. The type of pneumatic valve should indicate the requirements of the national standard number. If it is an enterprise standard, the relevant description of the model should be indicated.
3. The working pressure of the pneumatic valve is required to be ≥ the working pressure of the pipeline. On the premise of not affecting the price, the working pressure that the valve can bear should be greater than the actual working pressure of the pipeline. Any side of the pneumatic valve closed should be able to withstand 1.1 times the valve pressure value without leakage. Under the condition of valve opening, the valve body should be able to withstand twice the valve pressure.
4, pneumatic valve manufacturing standards, should explain the basis of the national standard number or enterprise standards.
5. Material of sealing surface:
The pneumatic valve category is different, the sealing method and material requirements are different;
Ordinary wedge gate valve, copper ring material, fixed way, grinding method should be described;
The soft seal gate valve, valve plate lining material of physical and chemical and health testing data;
6. Valve shaft packing:
Because the pneumatic valve in the pipe network is usually opened and closed infrequently, the filler is required to be inactive within a few years, and the filler is not aging, and the sealing effect is maintained for a long time;
The valve shaft packing should also be subjected to frequent opening and closing, the good sealing effect;
In view of the above requirements, the valve shaft packing to lifelong or more than ten years without replacement;
If the packing needs to be replaced, the pneumatic valve design should consider the replacement measures under the condition of water pressure.
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