For extremely thick fluids or solid particles, a specialist valve often known as a knife-gate valve is used to cut through the liquid / solids. On opening the gate valve, the flow path is enlarged in a highly nonlinear manner with respect to percent of opening. This means that flow rate does not change evenly with stem travel
The special shut-off technique makes it suitable for both fluids and dry media such as pulp, sludge, biomass, powder and different kinds of waste.
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