Väravakraana

Väravakraana is an Estonian term that translates to "gate valve" in English. It refers to a type of valve used to control the flow of fluids, typically in piping systems. The defining characteristic of a väravakraana is its mechanism of operation. It features a wedge-shaped or rectangular gate that slides vertically across the path of the fluid. When the gate is fully raised, it creates an unobstructed passage, allowing fluid to flow freely. Conversely, when the gate is lowered, it seals against the valve seat, effectively stopping the flow.

Väravakraanad are commonly used in applications where a full, unrestricted flow is desired when the valve is open, and a tight shut-off is required when closed. They are not typically used for throttling or regulating flow partially, as the partially open gate can be prone to vibration and wear. These valves are often found in water distribution systems, sewage lines, and industrial processes where maintaining a straight flow path is important. Their simple design makes them robust and reliable for on-off applications. The operation of a väravakraana is usually manual, involving a handwheel that is turned to raise or lower the gate.