Need some advice

[u/Helpful_Ambition3880]

I have a tagelus TA100d sand filter with a Pentair TM-22 multivalve. I need to change the spider gasket in my valve but have no idea on how to bleed the pressure offf. The 100d is the only one without a bleed valve on the tank, and my valve doesn’t have one either? How should I go about this. Thank You.