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<p>valves are used to shut off the flow of liquids rather than for flow regulation, which is frequently done with a <a href="page.php?w=globe_valve">globe valve</a>. When fully open, the typical gate valve has no obstruction in the flow path, resulting in very low <a href="page.php?w=Drag_%28physics%29">flow resistance</a>. The size of the open flow path generally varies in a nonlinear manner as the gate is moved. This means that the flow rate does not change evenly with stem travel. Depending on the construction, a partially open gate can vibrate</p><p>
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