Maintenance and extension of service life of High-Pressure Control Valves

In industrial automation systems, high voltage control valve plays a vital role. Like the system's "regulation hub," they precisely control parameters such as media flow, pressure and temperature to ensure stable and efficient operation throughout the production process. Once the high voltage control valve malfunctions, it will not only affect production efficiency, but also lead to safety accidents and major economic losses. Therefore, scientific and reasonable maintenance of high voltage control valve and extension of its service life are the key aspects to ensure smooth operation of industrial production.

 

 

Routine Inspection

Routine inspection is the basis of routine maintenance. A thorough examination can identify potential problems in a timely manner.

• Understanding operations: Operators must closely monitor valve opening, flow, pressure, and other parameters to determine whether the valve is fluctuating in a normal range. If the parameter abnormality is found, the reason should be analyzed in time and corresponding measures should be taken. For example, a sudden increase or decrease in flow may indicate a blockage or leakage within the valve that requires further inspection.
• Check power supply: For electric or pneumatic high-pressure control valves, check that the power supply or air supply is normal. Check that power supply voltage is stable and the air supply pressure meets requirements. Excessive fluctuation of power supply voltage fluctuations may affect the normal operation of the valve, and insufficient air supply pressure may cause pneumatic valves to operate slowly or not operate properly.
•  Check for leaks at Sealing Points points: Double check all sealing parts of the valve, such as bonnet, valve seat and flange connections, for leaks. Soap water can be used for testing, and if bubbles form, leaks can occur. Leak will not only cause waste of media, but also cause safety hazards. Connector and connector inspection: Check for connector deformation, cracks, or other defects to ensure the connector is not loose. Pipeline deformation will affect the flow of media and loose joints will lead to leakage. For example, in high temperature and pressure environment, pipelines are prone to deformation under long-term stress and need to be replaced in a timely manner.
• Check for abnormal sound and vibration: Normal high voltage control valves should not have any abnormal sound or vibration. If a sharp friction sound, banging, or noticeable vibration is felt within the valve, it indicates that internal components may be damaged or improperly installed and require further inspection.

Regular maintenance
Regular maintenance is an important part of valve comprehensive upkeep, which can extend the valve service life.

• Adjusted Sealing Components: The sealing element of the valve may wear out over time, resulting in a decrease in sealing performance. Periodically inspect seals such as gaskets and gaskets for wear and tear and replace them if damaged. At the same time, adjust the tightening force of the seal to ensure good sealing.
• Lubrication: For valves with moving parts such as stem and core, regular lubrication can reduce friction and wear and ensure smooth valve operation. When lubricating oil is added, select the appropriate type and add the specified amount.
• Maintenance of drainage and filtration systems
  Over time, impurities accumulate in valves and filtration system, disrupting normal valve function. To prevent this from happening, the valve should be emptied periodically to remove debris and pollutants. In addition, the filtration system thoroughly cleaned to maintain efficient filtration and prevent impurities from clogging the valve.
• Check for Connection Point Corrosion: highpressure control valve for humid or corrosive environment, connection point easy to corrode. Check the joint regularly for corrosion. If serious corrosion is found, timely anticorrosion measures should be taken, such as painting or replacing anticorrosion joints.

Regular Calibration

• Regular calibration can ensure that the performance of the high voltage control valve meets requirements and ensure that its operation is accurate and reliable.
• Static Performance Testing: Static performance testing mainly includes sealing performance test and strength test. Seal performance testing checks whether the valve can effectively prevent media leakage when closed; strength tests check whether the valve can withstand the pressure of the internal media at specified pressure without cracking. Static performance testing can detect valve sealing problems and strength defects in a timely manner.
• Flow characteristics test: Verifies that the valve's flow and opening relationship meets design requirements. The experiment reveals the valve's regulating performance and determines whether the valve conformed to the production process. Valves need to be adjusted or replaced if flow characteristics do not meet standards.

Routine maintenance

• Daily maintenance is an important means to deal with valve malfunctions and restore normal operation in a timely manner.
• Stress Relief: During installation and use, valves may be subjected to various stresses, such as thermal and mechanical stress. These stresses can lead to valve deformation and cracking. Regular stress relief treatments treatments, such as heat treatment and mechanical straightening, can reduce the impact of stress on the valve.
• Rust removal: Rust removal accelerates valve wear and corrosion and affects valve service life. Use mechanical or chemical cleaning to regularly remove rust and dirt from valve surface. Professional cleaning tools should be used for internal parts that are difficult to clean.
• Check bracket: The valve's support structure is very important for the stable operation of the valve. Inspect valve brackets regularly for sealing and for any loosening or deformation. If problems are found, they should be reinforced or replaced in time to ensure stable installation of the valve on a basic basis.
• Replace diaphragm: Diaphragm is a key component for high voltage control valves using diaphragm actuators. After prolonged use, the diaphragm may age or rupture, causing valve malfunction. Check the condition of the diaphragm regularly and replace it if damaged.

 

 

erosion

• Reason: In the throttle of the high pressure control valve, the medium flows at high speed. When the valve is in a smaller opening state, the intermediate speed can be higher, leading to greater corrosion and damage to components such as the core and seat of the valve, thus shortening the valve's lifespan.
• Prevention: Avoid operating valves in smaller openings. Adjust the opening of the valve to ensure that it operates in an appropriate range. At the same time, the opening speed and lifting force of the valve should be improved to reduce the high speed corrosion time of the the throttling orifice media.

Air Holes

• Reason: When the pressure the throttling orifice is lower than the saturated vapor pressure of the medium, the medium vaporizes, forming bubbles. These bubbles quickly burst as they enter the high-pressure zone, creating shock waves that impact and damage components such as the valve core and seat, resulting in a shorter valve lifespan.
• Prevention: use of anti-cavitation high-pressure valves. These valves have special structural design, which can effectively reduce gas erosion. At the same time, a multi-stage throttling method used to distribute the total pressure difference in multiple throttling stages, which reduces the pressure difference in each throttling stage and thus reduces cavitation.
• High-temperature media
• Reason: Medium to high temperature will lead to significant changes in the physical and chemical properties of valves, increasing corrosion and wear of valve materials. High temperature will also cause the valve internal components to expand and deform, affecting sealing performance and operational flexibility, thus shortening valve service life.
• Precautions: Try to avoid operating valves in high-temperature media. If unavoidable, cool measures should be taken to reduce the medium temperature. For example, install a cooling water jacket on the outside of the valve to circulate cooling water and remove heat.

Improper Sealing Pressure

• Reason: Sealing pressure refers to the pressure acting on unit area of a sealed cover. Inappropriate sealing pressure, whether too high or too low, can cause compression damage between the valve needle and seat. Excessive pressure accelerates surface wear and tear, and insufficient sealing pressure can lead to poor sealing and leakage.
• Precautions: Choose an appropriate sealing pressure. Determine the optimum sealing pressure ratio according to the design parameters and conditions of use of the valve. During valve installation and commissioning, tighten the valve with a torque wrench to ensure that the sealing pressure meets requirements. Where feasible, automatic control is implemented to precisely regulate the sealing pressure.

Impurities and pollutants

• The reason: impurities and pollutants in the medium, such as particles, dust, oil, etc., will enter the valve interior with the flow of the medium, accelerate wear and tear of the core, seat, etc., and affect the sealing performance and operational flexibility of the valve, thus shortening its service life.
• Precautions: Regularly filter high-pressure media. Install filters to remove impurities and contaminants before media enter the valve. Wash filters regularly to ensure effective filtration. At the same time, the oil tank is cleaned regularly to prevent contaminants from entering the valve actuator.

 

 

Selection and Installation

• Avoid selecting an Excessively Large DN Value: when selecting a high voltage control valve, the nominal diameter (DN value) should be determined reasonably according to actual process requirements. If the DN is too high, the valve may be in a small opening for a long time during operation, which may lead to corrosion and cavitation problems, thus shortening the valve's lifespan. Make sure the valve operates in the suitable opening to make the most its regulating performance.
• Select the opening valve: In theopening valve, the direction of movement of the core is consistent with the direction of movement of the medium. This structure can cushion the impact of the medium on the valve core, reduce wear and vibration, and improve valve safety. Flow opening valves also have advantages in regulating performance.

Material Selection

• Choosing corrosion resistant material and high fatigue strength material is the key to prolong the service life of high voltage control valve. In corrosive media environments, stainless steel, alloy steel and other corrosion resistant materials should be selected. For valve components subjected to alternating loads, materials of high fatigue strength should be selected to ensure that the valve does not break due to fatigue during long-term use.

Regular Replacement and Maintenance

• Periodically replace vulnerable parts such as seals and lubricants: after a certain period of use, seals and lubricants will wear and age, affecting valve performance. Regular replacement of these vulnerable parts ensures the valve's sealing performance and flexibility of operation. Develop a reasonable replacement cycle based on valve usage and the manufacturer's recommendations.
• Active maintenance: valve operating parameters and maintenance records to predict valve failures and take active maintenance measures. Proactive maintenance can prevent breakdowns from escalating, reduce downtime, and reduce maintenance costs.

Operating procedures

• Avoid hitting the valve hard or using the valve as a gasket against an object: hitting the valve hard can damage internal components and affect the sealing performance and operational flexibility of the valve. Using valves as gaskets to hit objects can also cause unnecessary damage and should be strictly prohibited.
• Avoid striking operating valves and ensure that process parameters are within permitted parameters: striking the valve during operation may cause vibration, loose or damaged internal parts of the valve. At the same time, process parameters such as flow rate, pressure and temperature are closely monitored to ensure that they fluctuate in an acceptable range. If process parameters exceed these limits, they should be adjusted in time to prevent valve damage.

Environmental controls
Regular inspection and repair of antiseptic coatings is essential for valves exposed to damp or corrosive environments. The anticorrosion coating can prevent corrosive medium from touching the valve surface and reduce the corrosion rate. Periodically check the integrity and adhesion of the anticorrosion coating, find the damage and repair it in time to ensure that the valve surface always has good anticorrosion performance.

 

 

Conclusion
High voltage control valve maintenance and service life extension is a system engineering, including routine maintenance, avoid shortening service life factors, and adopt practical techniques and strategies. Through daily inspection, regular maintenance, periodic calibration, daily maintenance and other key links, timely detection and solution of valve problems, to ensure valve operation. At the same time, understanding the factors that shorten valve service life and taking corresponding preventive measures can effectively prolong valve service life. In addition, the reliability and service life of valves can be further improved by correctly selecting practical techniques and strategies such as valve installation, selection of suitable materials, regular replacement and maintenance, and specification of operating and control environments. Regular maintenance, correct valve selection and standard operation are the key to ensure the long-term stability of high-voltage control valves. Only by doing these tasks well can we provide strong support for the smooth operation of industrial production.