The Difference & Selection of Full Bore and Reduced Bore Ball Valves
This article is about the difference and selection of full bore ball valves and reduced bore ball valves.
The ball valve is currently the most widely used mechanical product in the valve market, which is mainly composed of the valve body, seat, ball, stem and transmission device. We could achieve the function of switching or regulating through the actuator to drive the ball core rotation. The ball valve is widely used, and very popular in the chemical industry, environmental protection, water treatment, urban construction, machinery including food and other industries.
There are a wide variety of ball valves. Through the structure of the form, connection, pressure grade, driving form and other different, they can be combined into a variety of different functional products. Basically speaking, the ball valve has two major categories: the full bore ball valve and the reduced bore ball valve. Generally speaking, when the inner diameter of the ball is less than or equal to 85% of the inner diameter of the ball port, it is called a reduced bore ball valve. When the inner diameter of the ball valve s greater than 95% of the inner diameter of the ball port, it is called a full bore ball valve. Then, what are the differences between them when choosing or applying them?
Definition
1. The full bore ball valve is equal to the width of the flow channel, that is to say, the hole size is same from the flow into the outflow. Its size can not be less than the standard value. It is probably with the specification of the nominal diameter. For example, the flow channel diameter of the DN50 full bore ball valve also needs to be about 50.
2. The flow channel entrance of the reduced bore ball valve is wider than the flow channel diameter. The actual flow channel diameter is about one smaller than the specification, such as DN50 reduced bore ball valves. The diameter flow is about 38, roughly equivalent to DN40 specifications.
Applicable media
1. The full bore ball valve is generally used for conveying viscous and slagging medium pipelines. Because of its small fluid resistance, it can be said that there is basically no flow resistance, which can facilitate the passage of regular wax scraping and purging devices.
2. The reduced bore ball valve is suitable for conveying gas or physical properties similar to water on the pipeline medium, because its weight is about 30% lighter than that of the full bore ball valve. Its flow resistance is only about 1/7 of the same caliber globe valve.
Applicable process
1. For regular pigging of the pipeline, no matter what kind of medium, full bore ball valves must be used. If the medium is through the full bore ball valve, it will not reduce the flow. The flow resistance is small as an ideal pipeline control product, especially under strict conditions. Especially, the oil pipeline and gas pipeline in the main line need to be buried in the ground, we must use the full bore welded ball valve.
2. The reduced bore ball valve is suitable for some requirements. When the inner diameter of the valve is more than 80% of the inner diameter of the pipe end, it has little influence on the flow ability of the pipeline. Many valves have a reduced bore, which is generally controlled within 0.8. The reduced bore reduces the flow capacity of the valve. That is, the KV value of the valve increases the pressure drop at both ends of the valve. It results in the loss of energy. It does not have much impact on the pipeline, but it may increase the erosion of the pipeline.
4. Comparison of advantages and disadvantages
1. Installation space: the volume of the reduced bore ball valve is small, so its installation space requirements are smaller. Because its weight is about 30% lighter than that of the full bore ball valve, it is beneficial to reduce pipeline load, transportation load and costs.
2. Cost: the reduced bore ball valve price is a grade lower than the full bore ball valve. Considering the cost performance, the adjacent pipe diameter uses the same ball diameter body. For example, DN32 and DN40, DN50 and DN63, DN90 and DN110, DN160 and DN200, DN250 and DN315 adopt the same sphere.
Note: Due to the smaller inner diameter of the ball valve, the torque on the stem is small, which is more suitable for extending the service life of the valve switch, especially the low torque design of large-diameter valves. However, the diameter can not be reduced too much. Otherwise, the system resistance will increase. If the diameter is not reduced, it will increase the procurement cost. It will also generally reduce the valve control characteristics so that the adjustment effect is worse. For example, if the regulator is always used in a small opening, it will reduce the service life of the valve.
The ball valve is currently the most widely used mechanical product in the valve market, which is mainly composed of the valve body, seat, ball, stem and transmission device. We could achieve the function of switching or regulating through the actuator to drive the ball core rotation. The ball valve is widely used, and very popular in the chemical industry, environmental protection, water treatment, urban construction, machinery including food and other industries.
There are a wide variety of ball valves. Through the structure of the form, connection, pressure grade, driving form and other different, they can be combined into a variety of different functional products. Basically speaking, the ball valve has two major categories: the full bore ball valve and the reduced bore ball valve. Generally speaking, when the inner diameter of the ball is less than or equal to 85% of the inner diameter of the ball port, it is called a reduced bore ball valve. When the inner diameter of the ball valve s greater than 95% of the inner diameter of the ball port, it is called a full bore ball valve. Then, what are the differences between them when choosing or applying them?
Definition
1. The full bore ball valve is equal to the width of the flow channel, that is to say, the hole size is same from the flow into the outflow. Its size can not be less than the standard value. It is probably with the specification of the nominal diameter. For example, the flow channel diameter of the DN50 full bore ball valve also needs to be about 50.
2. The flow channel entrance of the reduced bore ball valve is wider than the flow channel diameter. The actual flow channel diameter is about one smaller than the specification, such as DN50 reduced bore ball valves. The diameter flow is about 38, roughly equivalent to DN40 specifications.
Applicable media
1. The full bore ball valve is generally used for conveying viscous and slagging medium pipelines. Because of its small fluid resistance, it can be said that there is basically no flow resistance, which can facilitate the passage of regular wax scraping and purging devices.
2. The reduced bore ball valve is suitable for conveying gas or physical properties similar to water on the pipeline medium, because its weight is about 30% lighter than that of the full bore ball valve. Its flow resistance is only about 1/7 of the same caliber globe valve.
Applicable process
1. For regular pigging of the pipeline, no matter what kind of medium, full bore ball valves must be used. If the medium is through the full bore ball valve, it will not reduce the flow. The flow resistance is small as an ideal pipeline control product, especially under strict conditions. Especially, the oil pipeline and gas pipeline in the main line need to be buried in the ground, we must use the full bore welded ball valve.
2. The reduced bore ball valve is suitable for some requirements. When the inner diameter of the valve is more than 80% of the inner diameter of the pipe end, it has little influence on the flow ability of the pipeline. Many valves have a reduced bore, which is generally controlled within 0.8. The reduced bore reduces the flow capacity of the valve. That is, the KV value of the valve increases the pressure drop at both ends of the valve. It results in the loss of energy. It does not have much impact on the pipeline, but it may increase the erosion of the pipeline.
4. Comparison of advantages and disadvantages
1. Installation space: the volume of the reduced bore ball valve is small, so its installation space requirements are smaller. Because its weight is about 30% lighter than that of the full bore ball valve, it is beneficial to reduce pipeline load, transportation load and costs.
2. Cost: the reduced bore ball valve price is a grade lower than the full bore ball valve. Considering the cost performance, the adjacent pipe diameter uses the same ball diameter body. For example, DN32 and DN40, DN50 and DN63, DN90 and DN110, DN160 and DN200, DN250 and DN315 adopt the same sphere.
Note: Due to the smaller inner diameter of the ball valve, the torque on the stem is small, which is more suitable for extending the service life of the valve switch, especially the low torque design of large-diameter valves. However, the diameter can not be reduced too much. Otherwise, the system resistance will increase. If the diameter is not reduced, it will increase the procurement cost. It will also generally reduce the valve control characteristics so that the adjustment effect is worse. For example, if the regulator is always used in a small opening, it will reduce the service life of the valve.
