kleppen

Kleppen are devices that regulate the flow of liquids or gases, permitting, restricting, or preventing passage. They can be passive components that respond to pressure differences or active components controlled by operators or automated systems. In Dutch engineering and everyday language, kleppen appear in pipelines, machines, water management, vehicles, and biology.

In mechanical engineering, common types include gate valves, globe valves, ball valves, butterfly valves, check valves, and safety valves. A valve may be manually operated or actuated by electric, pneumatic, or hydraulic power. They are chosen based on required shutoff tightness, flow characteristics, pressure rating, and temperature.

Within internal combustion engines, inlaatkleppen (intake valves) and uitlaatkleppen (exhaust valves) regulate the ingress of air-fuel mixtures and the exit of exhaust gases. In water management, kleppen such as sluice gates and control valves regulate water levels and flow in canals, rivers, and hydroelectric installations. In medical context, hartkleppen regulate blood flow through the heart, with types including the mitral, tricuspid, aortic, and pulmonary valves.

Materials vary: steel, stainless steel, brass, cast iron, and plastics, chosen for corrosion resistance and mechanical strength. Installation and maintenance focus on leak-tightness, durability under pressure, and safe actuation.

Terminology may differ regionally; in many languages klep translates to valve, flap, or lid, with specific terms for industrial devices. See also valve, actuator, pipeline, hydraulics, cardiology.