Profile: Hebei Leflow Import and Export Co.,Ltd. is a supplier of quality valves for industrial and commercial applications. Our products are widely used in oil refining, chemical processing, power, shipbuilding, pulp and paper, mining and pharmaceutical industries. A gate valve, known as a sluice valve, is a valve that opens by lifting a barrier (gate) out of the path of the fluid. When fully open, the typical gate valve has no obstruction in the flow path, resulting in very low flow resistance. 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.