Typical Use of gate valve

- Oct 23, 2018-

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. Most of the flow change occurs near shutoff with a relatively high fluid velocity causing gate and seat wear and eventual leakage if used to regulate flow. Also, a partially open gate tends to vibrate from the fluid flow. Thus, typical gate valves are designed to be fully opened or closed.[1] When fully open, the typical gate valve has no obstruction in the flow path, resulting in very low friction loss.