压力损失资料
Pressure Loss Information

• 所显示的压降曲线适用于标准扭矩弹簧和水平流向应用的Duo-Chek II止回阀
  The curves show pressure drops available with standard torque springs and the Duo-Chek II in horizontal flow.
• 为了获得最好的性能，Duo-Chek II应该安装在水平流向上，并且销钉垂直向上。对于其它安装方式，请联系工厂。
  Duo-Chek II valves should be installed in horizontal flow with pins vertical for best performance. For other installations, contact the factory.
• 我们可以对与您们系统行为相关的Duo-Chek II阀门进行评估。
  We can evaluate Duo-Chek II valves relative to your system behavior.

• 如果系统出现剧烈的流体减速，可能需要更高扭矩的弹簧，以实现更快的反应速度，减小水锤现象。请咨询工厂。
  Systems with drastic flow decelerations may require higher torque springs for faster valve response and to reduce water hammer. Please consult the factory.
• 每个管道系统都有其独特的几何结构，当阀门上游直接通过异径管子短接或扩径管接(15^o及以上，包括角度)的流体介质流速超过2.4米/秒，则应该对系统进行评估。如果可行的话，阀门与泵排泄口和管件(异径管子短接或扩径管接)之间的距离最小为5倍管道直径，这有利于最大限度延长阀门的使用寿命。
  Each piping system has a unique geometry which should be evaluated whenever the liquid media velocity exceeds 8 feet/second (2.4m/sec) through a swage or expansion (15^o or greater included angle) directly upstream of the valve. Where practicable, a minimum of five (5) pipe diameters distance should be maintained between the valve and the pump discharge and pipe fittings (swages or expansion) for maximum service life.