opening the gate valve on the deck gun

We have been experimenting with the idea of the gate valve on the deck gun for easier operations and maximizing our people on the truck. We have had several shifts practice this technique and we are still in the testing process. This was a video of demonstrating the ease of opening and closing the gate valve with pressure and flow.
1 3/8 tip over pumped with approx. 90 lbs giving 600 gpm's.
Our tank time was 1:28