Lubricated Sealing: The Core Advantage and Adaptability to Working Conditions of Ball Valves and Butterfly Valves
01 Aug, 2026
Ball valves and butterfly valves have a wide range of applications and occupy a significant share of the industrial valve market. However, in special scenarios such as gas pipelines, oil and gas transportation pipelines, and municipal water supply systems, the rotary plug valve still has an indispensable use value. The main advantage of the rotary plug valve is not simply the 90-degree rotation and operation, but its exclusive dynamic lubricated sealing structure. This core technical feature has earned wide recognition from engineering contractors and overseas purchasing customers, and also distinguishes the rotary plug valve from other types of valves.
Ordinary non-lubricated valves achieve sealing by squeezing the metal surfaces against each other. The sealing surfaces of these valves wear out quickly, and the sealing effect gradually deteriorates with the passage of time. The lubricated rotary plug valve is equipped with a dedicated grease injection sealing system. This system can effectively reduce equipment friction and achieve zero leakage of the medium. Fine grease grooves are machined in the middle position of the valve body and conical plug. Workers can add the dedicated sealing lubricating grease through the grease injection port on the top of the valve. When the valve is operated for opening or closing, the rotating plug will evenly apply the lubricating grease to all sealing surfaces, forming a tight and complete protective oil film. This oil film can fill all the tiny gaps between the metal contact surfaces.
This lubrication structure can solve two common problems of traditional industrial valves.
First, the oil film can completely separate the two metal contact surfaces. The oil film can reduce the opening and closing resistance of the valve and prevent it from getting stuck or jammed. When manual operation of the valve is performed or when the valve is paired with pneumatic or electric drive equipment, the valve can operate stably for a long time. The friction and wear between metals will be significantly reduced. The service life of the valve will be increased, and the overall operation and maintenance costs of the equipment will also decrease.
Second, the oil film formed by the grease can provide stable sealing protection. The oil film can prevent the penetration of pipeline media and achieve a zero-leakage usage effect in both directions. When the sealing surfaces of traditional hard-sealed valves are worn out over time, the sealing performance will continue to decline, and the equipment will experience internal leakage and reduced pipeline pressure. The lubricated rotary plug valve will not have such problems. Workers only need to replenish the grease to restore the valve's sealing performance and keep it in a stable sealing state for a long time. High-quality rotary plug valves can withstand a maximum pressure of 64 megapascals and a temperature of 325 degrees Celsius. Their adaptability to working conditions is far superior to ordinary general-purpose valves.
With this unique performance, the lubricated rotary plug valve has a clear market positioning and will not fall into the low-price competition of homogeneity. For flammable and explosive media such as natural gas and refined oil, the requirements for valve sealing are extremely high. The rotary plug valve is an excellent choice for such usage scenarios. In the scenarios of municipal water supply pipelines and low-pressure industrial pipelines, the wear-resistant and maintenance-simple characteristics of the rotary plug valve can effectively reduce the long-term operating costs of the project.
Pressure-balanced lubricated rotary plug valves are widely used in oil and gas storage, oil transportation, and chemical industries. This valve complies with ISO 15848-1 B-level low-emission standards and can meet the construction specifications and usage requirements of high-end industrial projects.
During the process of conducting foreign trade promotion and customer development, we need to clarify one point: The rotary plug valve does not belong to low-end general-purpose accessories. It relies on mature lubricated sealing technology and is a high-value specialized valve. We do not simply rely on low prices to seize the market. The core advantage of the rotary plug valve is that the sealing performance can be repaired, the service life is longer, it can achieve zero leakage, and the daily maintenance is simple and convenient. Most overseas engineering enterprises, gas distributors, and municipal water supply purchasing teams will encounter problems of pipeline leakage and frequent valve damage. The lubricated rotary plug valve can perfectly solve these practical usage problems.
Ordinary non-lubricated valves achieve sealing by squeezing the metal surfaces against each other. The sealing surfaces of these valves wear out quickly, and the sealing effect gradually deteriorates with the passage of time. The lubricated rotary plug valve is equipped with a dedicated grease injection sealing system. This system can effectively reduce equipment friction and achieve zero leakage of the medium. Fine grease grooves are machined in the middle position of the valve body and conical plug. Workers can add the dedicated sealing lubricating grease through the grease injection port on the top of the valve. When the valve is operated for opening or closing, the rotating plug will evenly apply the lubricating grease to all sealing surfaces, forming a tight and complete protective oil film. This oil film can fill all the tiny gaps between the metal contact surfaces.
This lubrication structure can solve two common problems of traditional industrial valves.
First, the oil film can completely separate the two metal contact surfaces. The oil film can reduce the opening and closing resistance of the valve and prevent it from getting stuck or jammed. When manual operation of the valve is performed or when the valve is paired with pneumatic or electric drive equipment, the valve can operate stably for a long time. The friction and wear between metals will be significantly reduced. The service life of the valve will be increased, and the overall operation and maintenance costs of the equipment will also decrease.
Second, the oil film formed by the grease can provide stable sealing protection. The oil film can prevent the penetration of pipeline media and achieve a zero-leakage usage effect in both directions. When the sealing surfaces of traditional hard-sealed valves are worn out over time, the sealing performance will continue to decline, and the equipment will experience internal leakage and reduced pipeline pressure. The lubricated rotary plug valve will not have such problems. Workers only need to replenish the grease to restore the valve's sealing performance and keep it in a stable sealing state for a long time. High-quality rotary plug valves can withstand a maximum pressure of 64 megapascals and a temperature of 325 degrees Celsius. Their adaptability to working conditions is far superior to ordinary general-purpose valves.
With this unique performance, the lubricated rotary plug valve has a clear market positioning and will not fall into the low-price competition of homogeneity. For flammable and explosive media such as natural gas and refined oil, the requirements for valve sealing are extremely high. The rotary plug valve is an excellent choice for such usage scenarios. In the scenarios of municipal water supply pipelines and low-pressure industrial pipelines, the wear-resistant and maintenance-simple characteristics of the rotary plug valve can effectively reduce the long-term operating costs of the project.
Pressure-balanced lubricated rotary plug valves are widely used in oil and gas storage, oil transportation, and chemical industries. This valve complies with ISO 15848-1 B-level low-emission standards and can meet the construction specifications and usage requirements of high-end industrial projects.
During the process of conducting foreign trade promotion and customer development, we need to clarify one point: The rotary plug valve does not belong to low-end general-purpose accessories. It relies on mature lubricated sealing technology and is a high-value specialized valve. We do not simply rely on low prices to seize the market. The core advantage of the rotary plug valve is that the sealing performance can be repaired, the service life is longer, it can achieve zero leakage, and the daily maintenance is simple and convenient. Most overseas engineering enterprises, gas distributors, and municipal water supply purchasing teams will encounter problems of pipeline leakage and frequent valve damage. The lubricated rotary plug valve can perfectly solve these practical usage problems.
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