APCO 净水空气释放阀 (ARV) 的作用是释放压力管道每个高点处聚集的气穴，这对于管道效率和水锤防护至关重要。空气释放阀有各种孔径和结构材料可供选择，以满足各种应用。
加压封闭管道系统中的空气会产生许多负面影响。当液压管道中存在空气时，流量会变得不稳定、不可预测，并且压头损失很大。气穴会减小横截面积并增加摩擦压力损失。两相流（空气和水）的总损失总是大于单独流动的每一相的压力损失。因此，管道中的空气会增加系统流动阻力并增加泵必须克服的系统压头。
当流速较低时，管道中的空气往往会聚集在管线的高点。如果形成的气穴很大，当速度增加时，其中的一部分将被去除。这些被隔离的空气可能会也可能不会通过系统，这取决于速度、管道尺寸和管道下坡。空气可能只会进入倾斜的直线部分，然后在速度降低时返回到顶部。
虽然不可能完全防止管道系统内空气（或气体）的积聚，但通过在管道高点安装 APCO 空气释放阀可以大大减少其体积。
The APCO Clean Water Air Release Valves (ARV) function to release air pockets that collect at each high point of a pressured pipeline, and are essential for pipeline efficiency and water hammer protection. Air Release Valves are available in a wide variety of orifice sizes and materials of construction to meet a wide range of applications.
Air in a pressurized closed-pipeline system can have many negative effects. When air is present in a hydraulic pipeline, flows are erratic, unpredictable and have high head losses. An air pocket will decrease the cross-sectional area and increase frictional pressure loss. The combined loss for two-phase flow (air and water) is always greater than the pressure loss for each phase flowing alone. Thus, air in a pipeline increases system flow resistance and increases system head against which pumps must operate.
Air in piping tends to collect at high points in the line when flow velocities are low. If the air pocket formed is large, part of it will be removed when the velocity increases. This partitioned air may or may not go through the system, depending on velocity, pipe size, and pipe down-slope. Air may only move into the sloping straight section and then return to the summit when the velocity decreases.
While it is impossible to totally prevent accumulation of air (or gases) within the piping system, the volume can be greatly minimized by installing APCO Air Release Valves on pipeline high points.
ARV.pdf
尺寸范围：
1/2 – 6 英寸（15-150 毫米）
车身类型：
50A、200、200A、205、206、207 系列
主体材料：
青铜、球墨铸铁、碳钢、316不锈钢
SIZE RANGE:
1/2 – 6″ (15-150mm)
BODY STYLES:
Series 50A, 200, 200A, 205, 206, 207
BODY MATERIAL:
Bronze, ductile iron, carbon steel, 316 stainless steel