The key feature of globe valves is their excellent sealing performance, making them ideal for applications where precise flow control is necessary. Since the contact between the valve disc and the valve seat when closed is perpendicular, it helps prevent leakage even after long-term use.
Common applications include controlling the flow of liquids or gases in pipeline systems, especially in high-pressure and high-temperature environments, where globe valves offer reliable performance and dependability.
Error Explanation: globe valves have specific flow direction requirements. If the valve is installed incorrectly, it may fail to operate properly, potentially leading to leakage or system failure.
Correct Procedure:
Before installation, carefully check the arrow markings on the valve (usually located on the side of the valve body) that indicate the correct flow direction.
Ensure the valve’s inlet is aligned with the pipeline’s fluid entry direction, and the outlet matches the direction of flow.
If there is no clear arrow marking, refer to the valve’s design drawings or contact the manufacturer to confirm the flow direction.
Error Explanation: Many operators overlook the seal face inspection after installing a globe valve, leading to leakage during long-term use, which affects the sealing and pressure stability of the pipeline system.
Correct Procedure:
Before installation, inspect the valve’s sealing surfaces to ensure they are free from dirt, damage, or corrosion.
Use appropriate sealing materials such as PTFE (polytetrafluoroethylene) gaskets or other recommended seals.
Ensure the sealing surfaces are smooth and flawless to prevent uneven pressure distribution, which could lead to leakage.
Error Explanation: During installation, some individuals may over-tighten the valve connection nuts due to concerns about improper sealing, which can damage the valve or the pipeline.
Correct Procedure:
Tighten connection nuts with the appropriate torque value as per the manufacturer’s instructions, avoiding over-tightening or under-tightening.
During tightening, ensure even pressure distribution around the valve-pipeline connection to prevent localized excessive pressure that could lead to valve rupture or damage.
Error Explanation: Each globe valve has specific temperature and pressure limits; exceeding these limits can result in valve damage or safety issues.
Correct Procedure:
Before installation, understand the valve’s operating conditions to ensure it is suitable for the temperature and pressure of the pipeline system.
Perform pressure and temperature tests before use to ensure the valve operates within the safe range.
Regularly monitor the system’s pressure and temperature to ensure the valve remains within its designed operating conditions.
Error Explanation: Although globe valves are designed for long service life, neglecting regular maintenance and inspection may lead to internal wear, causing leakage, operational difficulties, or complete failure.
Correct Procedure:
Set up a regular inspection and maintenance schedule to check the valve for loosening, leakage, or wear.
Periodically clean the valve to remove dust and corrosion, ensuring proper sealing between the valve disc and valve seat.
Before each shutdown, inspect the valve’s open/close functionality to ensure smooth operation and avoid valve jamming due to long periods of inactivity.
Proper globe valve installation and operation are crucial as they directly affect the safety, reliability, and efficient operation of industrial pipeline systems. By avoiding the five major errors above and following the correct procedures, you can significantly reduce risks during installation and use, ensuring the long-term stable operation of the equipment. Stay vigilant and conduct regular maintenance to maintain the system’s optimal performance.
Key Point: Cleaning is the foundation for ensuring the long-term effective operation of the globe valve. Dirt, corrosion, and impurities can affect the valve’s normal function, leading to poor sealing, difficulty in operation, or valve failure.
Maintenance Suggestions:
Inspect both the external and internal parts of the valve regularly:
Check for signs of corrosion, cracks, or other damage on the valve body.
Periodically open the valve and inspect the wear on the valve disc, valve seat, and sealing surfaces.
Clean the valve and pipeline:
Use specialized cleaning tools or solvents to remove dirt, grease, or rust inside the valve and pipeline.
Keep the valve’s opening/closing mechanism free from blockages caused by accumulated debris.
Check the sealing surfaces:
Inspect the sealing surfaces for wear, damage, or aging, ensuring the valve seals properly when closed.
Key Point: globe valves require proper lubrication, especially for the valve stem and seat components. Lubrication reduces friction, extends the valve’s service life, and ensures smooth opening and closing operations.
Maintenance Suggestions:
Regularly lubricate:
Choose the appropriate lubricant based on the valve type and operating environment. Avoid excessive or insufficient lubrication, ensuring even distribution on key parts.
Adjust the valve:
Check the valve’s opening/closing flexibility and adjust the stem and disc positions if the valve is not fully opening or closing.
Check the stem seals:
Regularly inspect the valve stem seals for leaks and replace any seals that have aged or been damaged.
Step 3: Monitoring and Recording
Key Point: Monitoring the valve’s operating condition and recording maintenance information can help detect issues promptly and prevent unexpected shutdowns.
Maintenance Suggestions:
Monitor the operating condition regularly:
Use pressure gauges and flow meters to monitor the pressure and flow near the valve. If there are significant fluctuations in pressure or abnormal flow, inspect the valve.
Listen for unusual sounds or vibrations, as these may indicate valve failure.
Record maintenance data:
Maintain a maintenance log that records the date, content, and results of each maintenance session. This helps track the valve’s condition and ensures uninterrupted maintenance.
