Ball Valve

Introduction The Ball Valve is the device that controls the flow of water from the  pool to the pump. It determines how much of the water flow is from the skimmer and how much is from the floor drain. The valve is shaped like the letter T and it  is sometimes referred to as a T-valve.

320 valve

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Internal cylinder
Inside is the t-valve or cylinder which can rotate to close or open the different ports.
 
IMPORTANT
To prevent any possible damage turn off the pump before making any adjustments to the ball valve.

320 Internal Cylinder

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Open position The red handle allows you to rotate the internal cylinder there  are markings showing ‘open’ and ‘closed. When all the ‘open’ designations are aligned with the openings (see below), the flow of water is coming half from the skimmer and half from the floor drains and going to the  pump.
 

1900 nt open position

*Note:  Your  skimmer  and  bottom  drain  hoses  may  be  opposite  of  what  is  shown  on  these  diagrams  depending  on  the  actual  location  of  your  pump.  Check  your  pool  to  see  which  sides  they  are  on.  
 

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Skimmer only position
By turning the handle you can adjust the flow or shut off either the skimmer  or bottom drains. For example, you might close the drains to get more suction from the skimmer if you notice a lot of floating debris on top of the  water.

450 nt Skimmer only

*Note:  Your  skimmer  and  bottom  drain  hoses  may  be  opposite  of  what  is  shown  on  these  diagrams  depending  on  the  actual  location  of  your pump. Check  your  pool  to  see  which  sides  they  are  on.  
 

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Bottom drain only position
If not, you might want more drawn from the floor drains to reduce the amount of vacuuming necessary.
 

1900 nt bottom Drain

*Note:  Your  skimmer  and  bottom  drain  hoses  may  be  opposite  of  what  is  shown  on  these  diagrams  depending  on  the  actual  location  of  your  pump.  Check  your  pool  to  see  which  sides  they  are  on.  
 

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Closed position You can also shut off the flow going to the pump if you need to  service the pump or tank.
 
IMPORTANT
When needing to turn the handle more than 180°, unscrew the yellow screw and raise the handle past the stop
 

1900 nt closed position

*Note:  Your  skimmer  and  bottom  drain  hoses  may  be  opposite  of  what  is  shown  on  these  diagrams  depending  on  the  actual  location  of  your  pump. Check  your  pool  to  see  which  sides  they  are  on.  
 

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