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.
2. Day freezing crack;
3. Poor soldering, there are defects such as slag inclusion, unweld, stress crack, etc.
4. Prevention and solution of damage after the cast iron valve is hit by heavy objects
1. Improve the quality of casting, and carry out the strength test in strict accordance with the regulations before installation.
2.ZYB series booster pumps should be insulated or mixed with water at temperatures below 0° and below 0°. Stop valves should be drained.
3. The welds of the valve body and bonnet composed of welding shall be carried out in accordance with the relevant welding operation procedures, and the flaw detection and strength test shall 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.
Every year, our Hengstar company will display all the latest new products at online large-scale trade shows, hoping to arouse the interest of distributors, dealers and potential customers. New projects are our company's continuous improvement of existing products or the launch of the latest "new" models. New products are the design and development of all new products that many people have not seen or even thought of. Introduce products that consumers want. New Product Introduction (NPI) helps to bring all the right resources together at the right time.
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