1、 Diagnose the cause of leakage

Firstly, it is necessary to accurately diagnose the cause of the leak. Leakage may be caused by various factors, such as seal surface wear, material aging, improper installation, operational errors, or corrosion of the medium. By using detection tools and methods such as ultrasonic leak detectors, visual inspections, and pressure tests, the leakage source can be quickly identified, providing a strong basis for subsequent repairs.

2、 Solutions for different leakage locations

1. Leakage caused by detachment of the closure component

Reason: Poor operation resulted in the closure part getting stuck or exceeding the top dead center, and the connection being damaged or broken; Choosing the wrong material for the connectors cannot withstand the corrosion of the medium and mechanical wear.

Solution: Operate the valve correctly to avoid excessive force causing the closing component to get stuck or damaged; Regularly check whether the connection between the closing element and the valve stem is firm, and replace the connecting element in a timely manner if there is corrosion or wear; Choose connector materials with good corrosion resistance and wear resistance.

2. Leakage at the connection of the sealing ring

Reason: The sealing ring is not tightly rolled; Poor welding quality between the sealing ring and the body; Loose or corroded sealing ring threads and screws.

Solution: Use adhesive to fix the sealing ring at the rolling point; Repair and re weld any unfavorable welding conditions; Timely replace corroded or damaged threads and screws; Re weld the sealing ring connection according to the specifications.

3. Leakage of valve body and valve cover

Reason: The casting quality of cast iron parts is not high, with defects such as sand holes, loose structure, and slag inclusion; Cold weather and freezing cracks; Poor welding, defects such as slag inclusion, unwelded, and stress cracks; The valve was damaged after being hit by a heavy object.

Solution: Improve casting quality and conduct strength tests before installation; Insulate or heat treat valves with lower temperatures, and drain accumulated water from valves that are no longer in use; Welding shall be carried out in accordance with the welding operation procedures, and non-destructive testing and strength testing shall be conducted; Do not push or place heavy objects on the valve, and avoid hitting cast iron and non-metallic valves with a hammer.

4. Sealing surface leakage

Reason: The sealing surface is unevenly ground; The connection between the valve stem and the closing component is suspended, misaligned, or worn; The valve stem is bent or improperly assembled; Improper selection of sealing surface material.

Solution: Select the gasket material and type correctly according to the working conditions; Carefully adjust the valve to ensure smooth operation; Tighten the bolts evenly and symmetrically, using a torque wrench to ensure that the pre tightening force meets the requirements; Repair, grind, and color inspect the static sealing surface to ensure compliance with relevant requirements; Pay attention to cleanliness when installing the gasket to avoid it falling to the ground.

5. Leakage at the filling point

Reason: Improper selection of fillers; Incorrect installation of packing material; Aging of fillers; The accuracy of the valve stem is not high; Damaged components such as glands and bolts.

Solution: Select the appropriate packing material and type according to the working conditions; Install the packing correctly according to the specifications; Timely replace aging and damaged fillers; Straighten, repair, or replace bent or worn valve stems; Damaged components such as glands and bolts should be repaired or replaced in a timely manner; Follow the operating procedures and operate the valve with uniform speed and normal force.

3、 Preventive measures

1. Regular inspection and maintenance: Develop a reasonable maintenance plan based on the frequency of valve use and operating environment. Including cleaning the inner and outer surfaces of the valve, checking for loose fasteners, lubricating transmission components, etc. Through scientific maintenance, potential problems can be identified and addressed in a timely manner, extending the service life of valves.

2. Choosing high-quality valves: To fundamentally reduce the risk of valve leakage, it is necessary to choose high-quality valve products. Valve products that have undergone strict control from material selection, structural design to production processes can ensure excellent performance. Correct operation and installation: Follow the operating procedures and operate the valve correctly. During the installation process, pay attention to the installation position and direction of the valve to ensure that it can be opened and closed normally. Meanwhile, avoid applying excessive force or impacting the valve.