The rise of energy costs requires industrial production to improve production efficiency. As an important component in industrial production, whether the control valve
can achieve and maintain good sealing directly affects the efficiency of factory operation. Control valve leakage is an important indicator that control valve manufacturers, designers and users are more concerned about. The leakage of the control valve is divided into two parts: external leakage and internal leakage: external leakage generally refers to the leakage of packing and valve body bonnet seal; internal leakage generally refers to the leakage from the inlet to the outlet of the valve when the valve is closed. For the unbalanced valve core, it refers to the leakage at the valve seat. For the balanced valve core, it refers to the sum of the leakage at the valve seat and the leakage at the valve core sealing ring, but it is generally referred to as the valve seat leakage. External leakage is generally controlled by appropriate packing selection and reasonable connection design of valve body and bonnet. Manufacturers and users rarely require factory inspection, and environmental monitoring is generally carried out at the application site. The internal leakage of the control valve - the leakage of the valve seat is an important factory inspection index. At the same time, the user has strict requirements on the leakage level of the valve seat leakage. Therefore, it is of great significance to study and analyze the influencing factors of the valve seat leakage of the control valve. Causes of leakage of valve body and bonnet: 1. The casting quality of the cast iron is not high, and there are defects such as sand holes, loose structure, and slag inclusion on the valve body and bonnet body; 2. Cold cracking; 3. Poor welding, there are clips Slag, unwelded, stress cracks and other defects; 4. The cast iron valve is damaged after being hit by heavy objects. Maintenance methods: 1. Improve casting quality, and carry out strength test in strict accordance with regulations before installation; 2. For valves whose temperature is below 0 °C and below 0 °C, heat preservation or mixing should be carried out, and water should be removed for valves that are not in use; 3. The welding seam of the valve body and the bonnet composed of welding should be carried out according to the relevant welding operation regulations, and the flaw detection and strength test should also be carried out after welding; Metal valves and large-diameter valves should be installed with brackets.
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