Causes and solutions for leakage of valve body and bonnet of ZYB series booster pump 1. Reasons for casting of cast iron parts are not high, and there are defects such as sand holes, loose structure and slag inclusion on the valve body and bonnet body. Crack; 3. Poor welding, there are defects such as slag inclusion, unwelded, stress cracks, etc. 4. The cause of the leakage of the valve body and bonnet of the ZYB series booster pump after the impact of the cast iron valve is damaged by heavy objects and the cause of the solution 1 The casting quality of cast iron parts is not high, and there are defects such as sand holes, loose structures and slag inclusions on the valve body and the valve cover body.
3. Poor welding, there are defects such as slag inclusion, unwelded, stress cracking, etc. 4. Prevention and solution of damage after the cast iron valve is hit by heavy objects 1. Improve the casting quality, and conduct the strength test strictly according to the regulations before installation.
2. ZYB series booster pumps should be insulated or mixed with water at temperatures below 0° and below 0°. Stopped valves should be excluded from water. 3. Welds of valve body and bonnet composed of welding should be According to the relevant welding operation procedures, the flaw detection and strength test should also be carried out after welding;
4. It is forbidden to push and put heavy objects on the valve. It is not allowed to hit the cast iron and non-metal valves with the hammer. The installation of the large diameter valve should have the bracket.
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