The flow test equipment shown in the video consists of a 30 US gallon reservoir at the extreme top, on the underside of which are connected three 3" full opening ball valves.
These ball valves have a common opening and closing device to ensure all three valves open and close at the same time. The pump cages to be flow tested are installed, below the 3" ball valves, in the inverted position with balls & seats installed. When the valves are opened, each cage and ball & seat assembly has equal opportunity to allow water from the top reservoir to pass through them into the individual acrylic reservoirs beneath the cages being tested. These reservoirs each have a capacity of 4-1/2 US gallons and are graduated in 1/2 US gallons.
Using a stop watch and performing multiple flow tests, a fairly accurate flow capacity can be obtained for each cage for the conditions under which the tests were conducted.

On the viewer's left is a 4 port closed center cage.
In the center is the HIVAC cage of the same size.
On the right is a 4 port open center cage of the same size.


4 port closed center cage demonstrates approximately 11 US GPM

HIVAC Cage demonstrates approximately 34 US GPM

4 port open center cage demonstrates approximately 6 US GPM

The cages shown in this test would all fit in the standing position on a 2" bore RW pump. A 2" bore pump with a 100" stroke length operating at 10 strokes per minute requires an average flow rate through the intake of 27.2 US GPM to fill the pump. The HIVAC cage easily allows the required flow rate to pass through it while the other two cages tested indicate a considerable restriction to the fluid entering the pump.

This restriction causes a pressure differential which may allow gas/vapour to come out of solution and decrease pump efficiency.

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