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Knife Gate or Pinch Valve?

Knife Gate or Pinch Valve?

Knife Gate or Pinch Valve?

(OP)
I need to provide a shutoff valve in a gravity flow storm drain piping system.  Size ranges from 6" to 24".  I commonly see gate valves specified on other projects, but I am concerned about their ability to properly seat with the potential for debris to be in the base of the piping.  I am considering knife gate valve or a pinch valve as alternatives.  Which is best for this application, and do you know of a link to a well known manufacturer of these valves?  This is a buried application and I need to be able to use a 2-inch operating nut and flush mounted valve box due to traffic in the area.  Thank you.  

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