A valve used to shut off flow from a material holding tank. There is no pressure other than head pressure from the 12k gal tank. The material is a latex product.The valve gets manually opened at the begining of the shift, and closed at the end.I am currently using 3"npt Apollo Bronze Ball Valves, and I'm think maybe there is another option. The Apollo valves have really gone up in price, and the 3" ball valve can be a bear to operate.The problem with latex products is that rests could tend to clog/harden or partly harden in the room between ball and valve body, giving excess operating torque. Normal steel or stainless steel would probably be OK (Solvent present ?) for your product. You could try a Globe - Y-pattern valve, preferably with sharp-edged seat, and check if you get a proper flow and avoid clogging. (Actually I doubdt this, but depending on product consistence) Alternatively you could try a stainless steel ball valve with three parts, making it possible to losen the four connecting bolts, take out three of them and swing out the ball-body part for inspection and cleaning/changing. The painting industry used years ago a sort of open-ended outlet with circle-segment formed sliding plane attached. Closing and opening by contra-formed attached 'gate', thus only suitable for open-ended flowregulating by filling barrels etc.

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