Butterfly valve, monitered or not?

Mon, 17 Feb 2014 12:58:26 -0800 

I am going to install a 4” butterfly valve on a sprinkler manifold.  This will 
give us an outlet to perform a Forward Flow.  Does the valve need to be 
monitored or will it be OK to use a chain to lock the valve in the closed 
position?   
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