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Hi Guys, Thanks for the great advises. I am clear now. The link that Ted provide is fantastic. [smile]

Hi 3DDave, Thanks for the advise. Vibration of the hopper and opening of the pinch valve will only happen during discharge operation. I am thinking about during preparation stage whereby the valve is in fully closed position and the hopper is filling up with the powder to be discharged, where...

Hi Ted, Thanks for the advise. I was thinking the hydrostatic formula only applies to fluids and not solid? Thanks.

Dear Engineers, I have a conical hopper and the outlet diameter is a 1" diameter pinch valve. Please can you guide me on the formula how much stress/pressure is the 1" diameter pinch valve experiencing when in fully closed position if the hopper is filled with 120Kg of Powder. The operating...