APCO AVV 空气/真空阀允许在管道填充或排空时将大量空气从管道中排出或进入管道。 它们由浮子操作，并具有与阀门入口大小相同的大型排放孔。 填充管道时，空气/真空阀处于打开状态。 当管道充满时，流体进入阀门，浮子上升并关闭。 管道充满后，空气/真空阀关闭并在正常运行期间保持关闭状态。 排空管道时，浮子下降并允许空气进入，防止真空和可能的管道塌陷或破坏水柱分离。 通过这种方式，大型排气孔可防止真空和水柱分离或管道塌陷。
AVV 还可配置为双体组合空气阀和 ARV 空气释放阀。 双体式允许使用具有各种孔径和更高工作压力的各种空气释放阀。 组合空气阀结合了空气/真空阀的功能，可在管道填充或排空期间排出大量空气，同时还具有空气释放阀，可在正常运行期间排出少量空气。 组合空气阀通常安装在系统的所有高点上，这些高点需要空气/真空阀和空气释放阀来排气和保护管道。
DeZURIK 还提供两种类型的 APCO 单体组合空气阀：用于清洁流体的 APCO AVC 单体组合空气阀，或用于清洁和肮脏流体的 ASU 高性能单体组合空气阀。 单体类型适用于需要紧凑性和/或因安装的可访问性而存在篡改风险的情况。
APCO Double Door Check Valves are designed to automatically prevent back-flow in systems where it is desirable to permit flow in one direction and prevent flow in the opposite direction. Double door check valves are recommended for clean liquids and gasses and have an excellent performance reputation in refineries, petrochemical, gas liquefaction, other process industries. They are also frequently used in HVAC applications because of their cost-efficient design and non-slam properties.
Double door check valves are spring loaded for fast, non-slam shut-off against the elastomer or metal body seat. When the pump starts and the downstream flow creates the required pressure drop in the forward direction, the double doors will automatically open. When the pump stops and the flow ceases, the torsion of the spring will automatically close the double doors prior to flow reversal. This creates a positive shut-off against flow reversal and minimizes system surges and water hammer.
The low weight and short laying length of the CDD Double Door Check Valve saves initial cost, requires less space, and is easier to install when compared to full-body, swing-type check valves. Although this valve is light in weight, it is capable of heavy duty, continuous operation. APCO carbon steel and stainless steel CDD Double Door Check Valves meet ASME B16.10/API 594 face-to-face dimensions and ASME B16.5 Flange Dimensions.
CDD.pdf
尺寸范围：
2-36 英寸 (50-900 毫米)；可根据需求提供更大尺寸
压力等级：
ASME 150 级适用于凸耳式阀门；ASME 150/300 级双额定适用于 2-6 英寸（50-150 毫米）对夹式阀门；ASME 150 级适用于 8 英寸（200 毫米）及更大的对夹式阀门
主体材料：
球墨铸铁、碳钢、不锈钢，其他材料可根据需求提供
车身类型：
9000T
SIZE RANGE:
2-36” (50-900mm); larger sizes available on application
PRESSURE RATING:
ASME Class 150 for lugged valves; ASME Class 150/300 dual rated for 2-6” (50-150mm) wafer valves; ASME Class 150 for 8” (200mm) and larger wafer valves
BODY MATERIAL:
Ductile iron, carbon steel, stainless steel, other materials available on application
BODY STYLES:
9000T
CAD Files