问题
PROBLEM

　　阀门内的污垢和碎片，或者防倒流总成内的机械故障可能导致安全阀排放，从而导致财产损失。可能导致安全阀连续排放的典型情况是：第一止回阀阀座上的污垢/碎片降低了防倒流阀的压力，阻塞安全阀的感应线，安全阀隔膜故障，第一止回阀弹簧断裂，错误的减压区启动程序。
　　Property damage due to relief valve discharge that can occur due to dirt and debris within the valve or a mechanical failure within the backflow prevention assembly. Typical conditions which can cause continuous relief valve discharge are: dirt/debris on first check seat of the reduced pressure backflow preventer, clogged relief valve sensing line, relief valve diaphragm failure, broken first check valve spring, and improper RPZ startup procedures.

解决方案
SOLUTION

　　美国瓦茨已经开发出113-6RFP地面保护-关闭阀。在正常情况下，113-6RFP保持全开状态。如果减压区安全阀出现开启，过量的流体将通过排放管道，从而激发流量感应器，从而激发113-6RFP上的电磁阀，引起阀门关闭。和一般的电磁阀不同，当流量停止和/或电磁阀失去激发，113-6RFP无法重新开启。对于间歇性排放，美国瓦茨ACV解决方案是有时间延迟的，因为其位于JB113接线盒内，在流量感应器和113-6RFP之间，保持控制阀的电磁阀直到需要时才被激发。一个安装型号51限制开关的阀门能够发送一个远程信号去显示警报，表示这个阀门被关闭。在减压区被建筑维护工程师或防倒流技术人员修好后，113-6RFP配置手动重新设置装置以恢复流量。
　　Watts has developed the 113-6RFP Flood Protection - Shutdown Valve. The 113-6RFP remains fully open under normal conditions. If the RPZ relief valve should open, excess flow through the drain pipe trips the flow sensor which energizes the solenoid on the 113-6RFP valve and it goes closed. Unlike a normal solenoid valve, the 113-6RFP cannot re-open if flow stops and / or the solenoid is de-energized. The Watts ACV solution to intermittent dumping is a time delay located in the JB113 Junction Box between the flow sensor and the 113-6RFP to keep the control valve solenoid from energizing until required. A valve mounted Fig. 51 Limit Switch is supplied which sends out a remote signal to sound an alarm, indicating that the valve is closed. The 113-6RFP is equipped with manual reset to restore flow after the RPZ is repaired by the building maintenance engineer or backflow technician.